# mypy: allow-untyped-defs import base64 import copy import copyreg import dataclasses import heapq import inspect import io import json import logging import math import operator import re import typing import traceback from contextlib import contextmanager from dataclasses import dataclass, field from enum import Enum from typing import ( Any, Callable, cast, Dict, final, Iterator, List, Optional, Set, Tuple, Type, Union, ) import sympy import torch import torch.export.exported_program as ep from torch._export.serde.schema import SchemaVersion from torch._export.verifier import load_verifier from torch._library.fake_class_registry import FakeScriptObject from torch._subclasses.fake_tensor import FakeTensor, FakeTensorMode from torch.fx.experimental import symbolic_shapes from torch.utils import _pytree as pytree from torch.utils._pytree import treespec_dumps, treespec_loads from torch.utils._sympy.numbers import int_oo from torch.utils._sympy.value_ranges import ValueRanges from .schema import ( # type: ignore[attr-defined] Argument, BufferMutationSpec, ConstantInputSpec, ConstantValue, CustomObjArgument, Device, ExportedProgram, GradientToParameterSpec, GradientToUserInputSpec, Graph, GraphArgument, GraphModule, GraphSignature, InputSpec, InputToBufferSpec, InputToCustomObjSpec, InputTokenSpec, InputToParameterSpec, InputToTensorConstantSpec, Layout, LossOutputSpec, MemoryFormat, ModuleCallEntry, ModuleCallSignature, NamedArgument, Node, OptionalTensorArgument, OutputSpec, OutputTokenSpec, RangeConstraint, ScalarType, SCHEMA_VERSION, SymBool, SymBoolArgument, SymExpr, SymExprHint, SymInt, SymIntArgument, TensorArgument, TensorMeta, TokenArgument, TREESPEC_VERSION, UserInputMutationSpec, UserInputSpec, UserOutputSpec, ) from .union import _Union from ..utils import remove_proxy_from_state_dict __all__ = [ "serialize", "GraphModuleSerializer", "ExportedProgramSerializer", "GraphModuleDeserializer", "ExportedProgramDeserializer", ] log = logging.getLogger(__name__) class SerializeError(RuntimeError): pass def _reverse_map(d: Dict[Any, Enum]): return {v.value: k for k, v in d.items()} MetaType = Union[ FakeTensor, int, torch.SymInt, bool, torch.SymBool, ep.CustomObjArgument ] ST_DELIMITER = ";" _TORCH_TO_SERIALIZE_DTYPE = { torch.uint8: ScalarType.BYTE, torch.int8: ScalarType.CHAR, torch.int16: ScalarType.SHORT, torch.int32: ScalarType.INT, torch.int64: ScalarType.LONG, torch.float16: ScalarType.HALF, torch.float32: ScalarType.FLOAT, torch.float64: ScalarType.DOUBLE, torch.complex32: ScalarType.COMPLEXHALF, torch.complex64: ScalarType.COMPLEXFLOAT, torch.complex128: ScalarType.COMPLEXDOUBLE, torch.bool: ScalarType.BOOL, torch.bfloat16: ScalarType.BFLOAT16, } _SERIALIZE_TO_TORCH_DTYPE = _reverse_map(_TORCH_TO_SERIALIZE_DTYPE) # type: ignore[arg-type] _TORCH_TO_SERIALIZE_LAYOUT = { torch.sparse_coo: Layout.SparseCoo, torch.sparse_csr: Layout.SparseCsr, torch.sparse_csc: Layout.SparseCsc, torch.sparse_bsr: Layout.SparseBsr, torch.sparse_bsc: Layout.SparseBsc, torch._mkldnn: Layout._mkldnn, # type: ignore[attr-defined] torch.strided: Layout.Strided, } _SERIALIZE_TO_TORCH_LAYOUT = _reverse_map(_TORCH_TO_SERIALIZE_LAYOUT) # type: ignore[arg-type] _TORCH_TO_SERIALIZE_MEMORY_FORMAT = { torch.contiguous_format: MemoryFormat.ContiguousFormat, torch.channels_last: MemoryFormat.ChannelsLast, torch.channels_last_3d: MemoryFormat.ChannelsLast3d, torch.preserve_format: MemoryFormat.PreserveFormat, } _SERIALIZE_TO_TORCH_MEMORY_FORMAT = _reverse_map(_TORCH_TO_SERIALIZE_MEMORY_FORMAT) # type: ignore[arg-type] _SYM_INT_OPS = { operator.mul, operator.add, operator.sub, operator.floordiv, operator.mod, operator.pow, torch.sym_int, torch.sym_float, torch.sym_ite, torch.sym_max, torch.sym_min, torch.sym_sqrt, } _SYM_BOOL_OPS = { operator.eq, operator.ne, operator.le, operator.ge, operator.lt, operator.gt, torch.sym_not, } assert not any(isinstance(op, torch._ops.OpOverload) for op in _SYM_INT_OPS) assert not any(isinstance(op, torch._ops.OpOverload) for op in _SYM_BOOL_OPS) @dataclass class SerializedArtifact: exported_program: bytes state_dict: bytes constants: bytes example_inputs: bytes @dataclass class _SerializedProgram: exported_program: ExportedProgram state_dict: bytes constants: bytes example_inputs: bytes def deserialize_device(d: Device) -> torch.device: if d.index is None: return torch.device(type=d.type) # type: ignore[call-overload] return torch.device(type=d.type, index=d.index) def serialize_sym_int(s: Union[int, torch.SymInt]) -> SymInt: if isinstance(s, (torch.SymInt, sympy.Symbol, int)): if symbolic_shapes.is_concrete_int(s): return SymInt.create(as_int=int(s)) else: assert isinstance(s, (torch.SymInt, sympy.Symbol)) if s.node.hint is None: return SymInt.create(as_expr=SymExpr(str(s))) else: return SymInt.create( as_expr=SymExpr(str(s), hint=SymExprHint.create(as_int=s.node.hint)) ) else: raise SerializeError( f"SymInt should be either symbol or int, got `{s}` of type `{type(s)}`" ) def serialize_sym_bool(s: Union[bool, torch.SymBool]) -> SymBool: if isinstance(s, (torch.SymBool, bool)): if symbolic_shapes.is_concrete_bool(s): return SymBool.create(as_bool=bool(s)) else: return SymBool.create(as_expr=SymExpr(expr_str=str(s))) else: raise SerializeError( f"SymBool should be either symbol or bool, got `{s}` of type `{type(s)}`" ) def serialize_tensor_meta(t: torch.Tensor) -> TensorMeta: """ Extract a TensorMeta describing `t`. """ return TensorMeta( dtype=_TORCH_TO_SERIALIZE_DTYPE[t.dtype], sizes=[serialize_sym_int(s) for s in t.shape], requires_grad=t.requires_grad, device=Device(type=t.device.type, index=t.device.index), strides=[serialize_sym_int(s) for s in t.stride()], storage_offset=serialize_sym_int(0), # TODO needs to be fixed. layout=_TORCH_TO_SERIALIZE_LAYOUT[t.layout], ) _CURRENT_DESERIALIZER: Optional["GraphModuleDeserializer"] = None def _reduce_fake_tensor(fake_tensor: FakeTensor): is_parameter = isinstance(fake_tensor, torch.nn.Parameter) tensor_meta = serialize_tensor_meta(fake_tensor) tensor_meta_bytes = json.dumps( _dataclass_to_dict(tensor_meta), cls=EnumEncoder ).encode("utf-8") return _reconstruct_fake_tensor, (tensor_meta_bytes, is_parameter) def _reconstruct_fake_tensor( serialized_tensor_meta: bytes, is_parameter: bool ) -> FakeTensor: # Deserialize the bytes into a TensorMeta json_tensor_meta = json.loads(serialized_tensor_meta.decode("utf-8")) tensor_meta = _dict_to_dataclass(TensorMeta, json_tensor_meta) # Find the current fake mode assert ( _CURRENT_DESERIALIZER is not None ), "Need access to current deserializer state" fake_tensor = _CURRENT_DESERIALIZER.deserialize_tensor_meta(tensor_meta) if is_parameter: fake_tensor = torch.nn.Parameter(fake_tensor) # type: ignore[assignment] return fake_tensor def serialize_torch_artifact(artifact: Optional[Any]) -> bytes: if artifact is None: return b"" assert ( FakeTensor not in copyreg.dispatch_table ), "Refusing to stomp on existing FakeTensor reducer" try: copyreg.pickle(FakeTensor, _reduce_fake_tensor) buffer = io.BytesIO() # This is a workaround for backend's tensor deserialization problem: # unpickleTensor() always create a tensor on the device where it was originally saved # This behavior is bad for multi-gpu training, as we wish to directly load the tensor # on the designated device. # For now, we simply move the tensor to cpu before saving. # TODO: this should be fixed by deserialization instead. torch.save(artifact, buffer) return buffer.getvalue() finally: del copyreg.dispatch_table[FakeTensor] def deserialize_torch_artifact(serialized: Union[Dict[str, Any], Tuple[Any, ...], bytes]): if isinstance(serialized, (dict, tuple)): return serialized if len(serialized) == 0: return {} buffer = io.BytesIO(serialized) buffer.seek(0) # weights_only=False as we want to load custom objects here (e.g. ScriptObject) artifact = torch.load(buffer, weights_only=False) assert isinstance(artifact, (tuple, dict)) return artifact def _sympy_int_to_int(val: sympy.Expr, adjust: str): # Convert simple sympy Integers into concrete int if val in (sympy.oo, int_oo): return math.inf if val in (-sympy.oo, -int_oo): return -math.inf if isinstance(val, sympy.Integer): return int(val) # TODO: Remove this adjustment when Ed gets rid of fractional ranges log.warning( "Export constraints cannot be non-integer expressions. Found " "type %s, and value %s. We will attempt to %s " "this value.", type(val), val, adjust ) if adjust == "floor": return math.floor(val) elif adjust == "ceil": return math.ceil(val) else: raise RuntimeError(f"Got invalid adjustment {adjust}") def _int_to_sympy_int(val) -> sympy.Expr: # Convert concrete int into simple sympy Integers if val == math.inf: return int_oo if val == -math.inf: return -int_oo return sympy.Integer(val) def serialize_range_constraints( range_constraints: Dict[sympy.Symbol, ValueRanges] ) -> Dict[str, RangeConstraint]: return { str(k): RangeConstraint( _sympy_int_to_int(v.lower, "ceil"), # type: ignore[arg-type] _sympy_int_to_int(v.upper, "floor"), # type: ignore[arg-type] ) for k, v in range_constraints.items() } def _get_schema_from_target(target): if isinstance(target, torch._ops.OpOverload): return target._schema elif type(target) in _serialization_registry: return _serialization_registry[type(target)].op_schema(target) raise RuntimeError(f"Cannot find schema for {type(target)}") def _is_single_tensor_return(target) -> bool: schema = _get_schema_from_target(target) returns = schema.returns return len(returns) == 1 and isinstance(returns[0].real_type, torch.TensorType) def _is_single_tensor_list_return(target: Any) -> bool: schema = _get_schema_from_target(target) returns = schema.returns if len(returns) != 1: return False return_type = returns[0].real_type return isinstance(return_type, torch.ListType) and isinstance( return_type.getElementType(), torch.TensorType ) @dataclass class GraphState: inputs: List[Argument] = field(default_factory=list) outputs: List[Argument] = field(default_factory=list) nodes: List[Node] = field(default_factory=list) tensor_values: Dict[str, TensorMeta] = field(default_factory=dict) sym_int_values: Dict[str, SymInt] = field(default_factory=dict) sym_bool_values: Dict[str, SymBool] = field(default_factory=dict) is_single_tensor_return: bool = False custom_obj_values: Dict[str, CustomObjArgument] = field(default_factory=dict) class Final(type): def __new__(metacls, name, bases, classdict): for b in bases: if isinstance(b, Final): raise TypeError(f"type '{b.__name__}' is not an acceptable base type") return type.__new__(metacls, name, bases, dict(classdict)) @final class GraphModuleSerializer(metaclass=Final): def __init__( self, graph_signature: ep.ExportGraphSignature, module_call_graph: List[ep.ModuleCallEntry], ): self.graph_state = GraphState() self.graph_signature = graph_signature self.module_call_graph = module_call_graph self.custom_objs: Dict[str, torch._C.ScriptObject] = {} self.duplicate_getitem_nodes: Dict[str, str] = {} @contextmanager def save_graph_state(self): saved = self.graph_state self.graph_state = GraphState() try: yield finally: self.graph_state = saved def handle_placeholder(self, node: torch.fx.Node): assert node.op == "placeholder" if isinstance(node.meta["val"], torch.Tensor): graph_input = Argument.create(as_tensor=TensorArgument(name=node.name)) self.graph_state.tensor_values[node.name] = serialize_tensor_meta( node.meta["val"] ) elif isinstance(node.meta["val"], torch.SymInt): raise AssertionError("SymInt graph input is not implemented yet.") elif isinstance(node.meta["val"], (int, bool, str, float, type(None))): graph_input = self.serialize_input(node.meta["val"]) elif isinstance(node.meta["val"], ep.CustomObjArgument): class_fqn = node.meta["val"].class_fqn graph_input = Argument.create( as_custom_obj=CustomObjArgument(name=node.name, class_fqn=class_fqn) ) self.graph_state.custom_obj_values[node.name] = ( self.serialize_script_obj_meta(node.meta["val"]) ) else: raise AssertionError(f"Unimplemented graph input type: {node.meta['val']}") self.graph_state.inputs.append(graph_input) def handle_output(self, node: torch.fx.Node): assert node.op == "output" assert len(node.args) == 1, "FX.Node's args should have one arg" node_args = node.args[0] if isinstance(node_args, torch.fx.Node): # For singleton tensor returns self.graph_state.is_single_tensor_return = True self.graph_state.outputs = [self.serialize_input(node_args)] else: assert isinstance(node_args, (tuple, list)) self.graph_state.outputs = [self.serialize_input(arg) for arg in node_args] def serialize_operator(self, target) -> str: if isinstance(target, str): return target elif target.__module__.startswith("torch._ops"): # TODO(zhxchen17) Maybe provide a function name helper in FX. # From torch.fx.node._get_qualified_name module = target.__module__.replace("torch._ops", "torch.ops") return f"{module}.{target.__name__}" else: # TODO(zhxchen17) Don't catch all here. return f"{target.__module__}.{target.__name__}" def handle_call_function(self, node: torch.fx.Node): assert node.op == "call_function" # getitem has been handled in the producer node, skip it here if node.target is operator.getitem: return meta_val = node.meta.get("val") if ( node.target in _SYM_INT_OPS or node.target in _SYM_BOOL_OPS or (meta_val is not None and isinstance(meta_val, (torch.SymInt, torch.SymBool))) ): assert len(node.kwargs) == 0 ex_node = Node( target=self.serialize_operator(node.target), inputs=self.serialize_sym_op_inputs(node.target, node.args), outputs=[ Argument.create( as_sym_int=self.serialize_sym_int_output(node.name, meta_val) ) if (node.target in _SYM_INT_OPS or isinstance(meta_val, torch.SymInt)) else Argument.create( as_sym_bool=self.serialize_sym_bool_output(node.name, meta_val) ) ], metadata=self.serialize_metadata(node), ) elif isinstance(node.target, torch._ops.OpOverload): ex_node = Node( target=self.serialize_operator(node.target), inputs=self.serialize_inputs(node.target, node.args, node.kwargs), outputs=self.serialize_outputs(node), # TODO: create a new tensor_values here, meta might have faketensor info metadata=self.serialize_metadata(node), ) elif isinstance(node.target, torch._ops.HigherOrderOperator): ex_node = Node( target=self.serialize_operator(node.target), inputs=self.serialize_hoo_inputs(node.args, node.kwargs), outputs=self.serialize_hoo_outputs(node), metadata=self.serialize_metadata(node), ) elif type(node.target) in _serialization_registry: # Sanity check for unhandled serialization. assert type(node.target) in _serialization_registry, f"{type(node.target)} is not supported in export serialization." handler = _serialization_registry[type(node.target)] namespace = handler.namespace() op_name = handler.to_op_name(node.target) assert isinstance(namespace, str) and isinstance(op_name, str) assert ":" not in namespace and ":" not in op_name ex_node = Node( target=f"#{namespace}:{op_name}", inputs=self.serialize_inputs(node.target, node.args, node.kwargs), outputs=self.serialize_outputs(node), metadata=self.serialize_metadata(node), ) else: raise SerializeError(f"Serializing {node.target} is not supported") self.graph_state.nodes.append(ex_node) def handle_get_attr(self, node): pass def _output_node_at_index(self, node, index) -> Optional[torch.fx.Node]: user_node = None for user in node.users: assert user.target is operator.getitem, f"{user} is not a getitem node" if index == user.args[1]: if user_node is None: user_node = user else: # We want to deduplicate getitem nodes that are trying to # index to the same index self.duplicate_getitem_nodes[user.name] = user_node.name return user_node def _output_node_name_at_index(self, node, index) -> str: user_node = self._output_node_at_index(node, index) if user_node is None: return f"{node.name}_unused_{index}" else: return user_node.name def serialize_metadata(self, node: torch.fx.Node) -> Dict[str, str]: ret = {} if stack_trace := node.meta.get("stack_trace"): ret["stack_trace"] = stack_trace if nn_module_stack := node.meta.get("nn_module_stack"): def export_nn_module_stack(val): assert isinstance(val, tuple) and len(val) == 2 path, ty = val assert isinstance(path, str) assert isinstance(ty, str) return path + "," + ty # Serialize to "key,orig_path,type_str" nn_module_list = [ f"{k},{export_nn_module_stack(v)}" for k, v in nn_module_stack.items() ] ret["nn_module_stack"] = ST_DELIMITER.join(nn_module_list) if source_fn_st := node.meta.get("source_fn_stack"): source_fn_list = [ f"{source_fn[0]},{self.serialize_operator(source_fn[1])}" for source_fn in source_fn_st ] ret["source_fn_stack"] = ST_DELIMITER.join(source_fn_list) if torch_fn := node.meta.get("torch_fn"): ret["torch_fn"] = ST_DELIMITER.join(list(torch_fn)) if custom := node.meta.get("custom"): try: ret["custom"] = json.dumps(custom) except Exception as e: raise SerializeError( f"Failed to serialize custom metadata for node {node.name} with error {e}" ) from e return ret def serialize_script_obj_meta( self, script_obj_meta: ep.CustomObjArgument ) -> CustomObjArgument: return CustomObjArgument( name=script_obj_meta.name, class_fqn=script_obj_meta.class_fqn, ) def serialize_sym_op_inputs(self, op, args) -> List[NamedArgument]: if isinstance(op, torch._ops.OpOverload): args_names = [arg.name for arg in op._schema.arguments] else: assert op in _SYM_INT_OPS or op in _SYM_BOOL_OPS args_names = list(inspect.signature(op).parameters.keys()) serialized_args = [] for args_name, arg in zip(args_names, args): serialized_args.append( NamedArgument(name=args_name, arg=self.serialize_input(arg)) ) return serialized_args def serialize_inputs( self, target: Any, # torch._ops.OpOverload and other custom operator types. args, kwargs=None ) -> List[NamedArgument]: assert isinstance(target, (torch._ops.OpOverload, *_registered_extension_types())) kwargs = kwargs or {} serialized_args = [] schema = _get_schema_from_target(target) for i, schema_arg in enumerate(schema.arguments): if schema_arg.name in kwargs: serialized_args.append( NamedArgument( name=schema_arg.name, arg=self.serialize_input(kwargs[schema_arg.name], schema_arg.type), ) ) elif not schema_arg.kwarg_only and i < len(args): serialized_args.append( NamedArgument( name=schema_arg.name, arg=self.serialize_input(args[i], schema_arg.type), ) ) else: # We intentionally don't serialize the missing arguments # with default values pass return serialized_args def serialize_hoo_inputs(self, args, kwargs) -> List[NamedArgument]: """ For serializing HOO inputs since HOOs do not have a schema. """ inputs = [ NamedArgument( name="", arg=self.serialize_input(a), ) for a in args ] inputs.extend( [ NamedArgument(name=name, arg=self.serialize_input(a)) for name, a in kwargs.items() ] ) return inputs def is_sym_int_arg(self, arg) -> bool: return isinstance(arg, int) or ( isinstance(arg, torch.fx.Node) and arg.name in self.graph_state.sym_int_values ) def is_sym_bool_arg(self, arg) -> bool: return isinstance(arg, bool) or ( isinstance(arg, torch.fx.Node) and arg.name in self.graph_state.sym_bool_values ) def serialize_input( self, arg, arg_type: Optional[torch._C.Argument] = None ) -> Argument: import torch._inductor.ir as inductor_ir inductor_tensor_buffers = ( inductor_ir.Buffer, inductor_ir.ReinterpretView, ) if isinstance(arg, torch.fx.Node): if arg.op == "get_attr": assert isinstance(arg.target, str) attr = getattr(arg.graph.owning_module, arg.target) if isinstance(attr, torch.Tensor): raise SerializeError( "getattr nodes containing tensors should not appear in the graph" ) elif isinstance(attr, torch.fx.GraphModule): with self.save_graph_state(): graph = self.serialize_graph(attr) return Argument.create( as_graph=GraphArgument(name=arg.target, graph=graph) ) else: raise SerializeError( f"Unsupported getattr attribute {arg.target} with type: {type(attr)}" ) elif self.is_sym_int_arg(arg): return Argument.create( as_sym_int=SymIntArgument.create(as_name=arg.name) ) elif self.is_sym_bool_arg(arg): return Argument.create( as_sym_bool=SymBoolArgument.create(as_name=arg.name) ) elif isinstance(arg.meta["val"], ep.CustomObjArgument): return Argument.create( as_custom_obj=CustomObjArgument( name=arg.name, class_fqn=arg.meta["val"].class_fqn ) ) elif arg.name in self.duplicate_getitem_nodes: dedup_name = self.duplicate_getitem_nodes[arg.name] return Argument.create(as_tensor=TensorArgument(name=dedup_name)) else: return Argument.create(as_tensor=TensorArgument(name=arg.name)) elif isinstance(arg, inductor_tensor_buffers): # Other branches are for arguments in fx node. # This is a special branch for handling buffers (representing tensor arguments) # for inductor's ExternalFallbackNode # export_extern_kernel_node() is using this function to serialize arguments arg_name = arg.get_name() assert arg_name is not None, "Buffer must have valid name" return Argument.create(as_tensor=TensorArgument(name=arg_name)) elif isinstance(arg, torch.SymInt): # This is a special branch for handling SymInt args in inductor's # ExternalFallbackNode. # For regular FX graph, SymInt arg should be a fx.Node with # self.is_sym_int_arg(arg) being true return Argument.create(as_sym_int=SymIntArgument.create(as_name=str(arg))) elif isinstance(arg, bool): return Argument.create(as_bool=arg) elif isinstance(arg, str): return Argument.create(as_string=arg) elif isinstance(arg, int): return Argument.create(as_int=arg) elif isinstance(arg, float): return Argument.create(as_float=arg) elif arg is None: return Argument.create(as_none=()) elif isinstance(arg, (list, tuple)): if len(arg) == 0: if arg_type is not None: if isinstance(arg_type, torch.OptionalType): arg_type = arg_type.getElementType() # type: ignore[assignment] assert isinstance(arg_type, torch.ListType) elem_type = arg_type.getElementType() if isinstance(elem_type, torch.OptionalType): elem_type = elem_type.getElementType() if isinstance(elem_type, torch.BoolType): return Argument.create(as_bools=[]) elif isinstance(elem_type, torch.IntType): return Argument.create(as_ints=[]) elif isinstance(elem_type, torch.FloatType): return Argument.create(as_floats=[]) elif isinstance(elem_type, torch.StringType): return Argument.create(as_strings=[]) elif isinstance(elem_type, torch.TensorType): return Argument.create(as_tensors=[]) else: # I believe empty symint lists default to ints, but # please file an issue if this is not the case raise SerializeError(f"Empty list with type {elem_type} nyi.") else: # We could serialize this by default to a tensor list. This # is needed in the HOO case log.warning( "Unsure how to serialize the given empty list, " "as we don't know what is the type of this argument. " "Serializing it as a tensor list by default." ) return Argument.create(as_tensors=[]) # Must check bool first, as bool is also treated as int if all(isinstance(a, bool) for a in arg): return Argument.create(as_bools=list(arg)) elif all(isinstance(a, int) for a in arg): return Argument.create(as_ints=list(arg)) elif all(isinstance(a, float) for a in arg): return Argument.create(as_floats=list(arg)) elif all(isinstance(a, str) for a in arg): return Argument.create(as_strings=list(arg)) elif all(isinstance(a, torch.SymInt) for a in arg): # This is a special branch for handling SymInt args in inductor's # ExternalFallbackNode. # For regular FX graph, SymInt arg should be a fx.Node with # self.is_sym_int_arg(arg) being true return Argument.create( as_sym_ints=[SymIntArgument.create(as_name=str(a)) for a in arg] ) elif all(self.is_sym_int_arg(a) for a in arg): # list of sym_ints values = [] for a in arg: if isinstance(a, torch.fx.Node): values.append(SymIntArgument.create(as_name=a.name)) elif isinstance(a, int): values.append(SymIntArgument.create(as_int=a)) return Argument.create(as_sym_ints=values) elif all(self.is_sym_bool_arg(a) for a in arg): # list of sym_bools values = [] for a in arg: if isinstance(a, torch.fx.Node): values.append(SymBoolArgument.create(as_name=a.name)) elif isinstance(a, bool): values.append(SymBoolArgument.create(as_bool=a)) return Argument.create(as_sym_bools=values) elif all(isinstance(a, torch.fx.Node) for a in arg): # list of tensors arguments = [] for a in arg: if a.op == "get_attr": raise SerializeError( "getattr nodes containing tensors should not appear in the graph" ) arguments.append(TensorArgument(name=a.name)) return Argument.create(as_tensors=arguments) elif all(isinstance(a, (torch.fx.Node, type(None))) for a in arg): # list of optional tensors def serialize_optional_tensor_args(a): if a is None: return OptionalTensorArgument.create(as_none=()) elif isinstance(a, torch.fx.Node): return OptionalTensorArgument.create( as_tensor=TensorArgument(name=a.name) ) else: raise SerializeError(f"Unsupported list/tuple argument: {a}") return Argument.create( as_optional_tensors=list(map(serialize_optional_tensor_args, arg)) ) elif all(isinstance(a, inductor_tensor_buffers) for a in arg): # list of inductor buffers return Argument.create( as_tensors=[TensorArgument(name=a.get_name()) for a in arg], ) elif all( isinstance(a, (*inductor_tensor_buffers, type(None))) for a in arg ): # list of inductor buffers as optional tensors def serialize_optional_tensor_args(a): if a is None: return OptionalTensorArgument.create(as_none=()) elif isinstance(a, inductor_tensor_buffers): return OptionalTensorArgument.create( as_tensor=TensorArgument(name=a.get_name()) ) else: raise SerializeError(f"Unsupported list/tuple argument: {a}") return Argument.create( as_optional_tensors=list(map(serialize_optional_tensor_args, arg)) ) else: raise SerializeError( f"Unsupported list/tuple argument type: {[type(a) for a in arg]}" ) elif isinstance(arg, torch.dtype): return Argument.create(as_scalar_type=_TORCH_TO_SERIALIZE_DTYPE[arg]) elif isinstance(arg, torch.device): return Argument.create(as_device=Device(type=arg.type, index=arg.index)) elif isinstance(arg, torch.memory_format): return Argument.create( as_memory_format=_TORCH_TO_SERIALIZE_MEMORY_FORMAT[arg] ) elif isinstance(arg, torch.layout): return Argument.create(as_layout=_TORCH_TO_SERIALIZE_LAYOUT[arg]) elif isinstance(arg, torch._C.ScriptObject): if not ( arg._has_method("__getstate__") # type: ignore[attr-defined] and arg._has_method("__setstate__") # type: ignore[attr-defined] ): raise SerializeError( f"Unable to serialize custom class {arg}. Please define " "serialization methods via def_pickle()." ) # Custom objects through torchind are serializable with pickle, # through implementing the .def_pickle function. This should result # in the object containing a __getstate__ and __setstate__ # serialize/deserialize function. custom_obj_name = f"_custom_obj_{len(self.custom_objs)}" self.custom_objs[custom_obj_name] = arg class_fqn = arg._type().qualified_name() # type: ignore[attr-defined] return Argument.create( as_custom_obj=CustomObjArgument(custom_obj_name, class_fqn) ) elif isinstance(arg, (torch._ops.OpOverload, torch._ops.HigherOrderOperator)): return Argument.create(as_operator=self.serialize_operator(arg)) else: raise SerializeError(f"Unsupported argument type: {type(arg)} with schema arg_type {arg_type}") def serialize_tensor_output(self, name, meta_val) -> TensorArgument: assert name not in self.graph_state.tensor_values self.graph_state.tensor_values[name] = serialize_tensor_meta(meta_val) return TensorArgument(name=name) def serialize_sym_int_output(self, name, meta_val) -> SymIntArgument: assert name not in self.graph_state.sym_int_values self.graph_state.sym_int_values[name] = serialize_sym_int(meta_val) return SymIntArgument.create(as_name=name) def serialize_sym_bool_output(self, name, meta_val) -> SymIntArgument: assert name not in self.graph_state.sym_bool_values self.graph_state.sym_bool_values[name] = serialize_sym_bool(meta_val) return SymBoolArgument.create(as_name=name) def serialize_input_spec(self, spec: ep.InputSpec) -> InputSpec: if spec.kind == ep.InputKind.USER_INPUT: if isinstance(spec.arg, ep.ConstantArgument): if isinstance(spec.arg.value, int): constant_spec = ConstantValue.create(as_int=spec.arg.value) elif isinstance(spec.arg.value, bool): constant_spec = ConstantValue.create(as_bool=spec.arg.value) elif isinstance(spec.arg.value, str): constant_spec = ConstantValue.create(as_string=spec.arg.value) elif isinstance(spec.arg.value, float): constant_spec = ConstantValue.create(as_float=spec.arg.value) elif spec.arg.value is None: constant_spec = ConstantValue.create(as_none=()) else: raise SerializeError(f"Unhandled constant input {spec.arg.value} to serialize") return InputSpec.create( constant_input=ConstantInputSpec( name=spec.arg.name, value=constant_spec ) ) else: return InputSpec.create( user_input=UserInputSpec( arg=self.serialize_argument_spec(spec.arg) ) ) elif spec.kind == ep.InputKind.PARAMETER: assert spec.target is not None assert isinstance(spec.arg, ep.TensorArgument) return InputSpec.create( parameter=InputToParameterSpec( arg=TensorArgument(name=spec.arg.name), parameter_name=spec.target, ) ) elif spec.kind == ep.InputKind.BUFFER: assert spec.target is not None assert isinstance(spec.arg, ep.TensorArgument) assert spec.persistent is not None return InputSpec.create( buffer=InputToBufferSpec( arg=TensorArgument(name=spec.arg.name), buffer_name=spec.target, persistent=spec.persistent, ) ) elif spec.kind == ep.InputKind.CONSTANT_TENSOR: assert spec.target is not None assert isinstance(spec.arg, ep.TensorArgument) return InputSpec.create( tensor_constant=InputToTensorConstantSpec( arg=TensorArgument(name=spec.arg.name), tensor_constant_name=spec.target, ) ) elif spec.kind == ep.InputKind.CUSTOM_OBJ: assert spec.target is not None assert isinstance(spec.arg, ep.CustomObjArgument) return InputSpec.create( custom_obj=InputToCustomObjSpec( arg=CustomObjArgument( name=spec.arg.name, class_fqn=spec.arg.class_fqn ), custom_obj_name=spec.target, ) ) elif spec.kind == ep.InputKind.TOKEN: assert isinstance(spec.arg, ep.TokenArgument) return InputSpec.create( token=InputTokenSpec( arg=TokenArgument(name=spec.arg.name), ) ) else: raise AssertionError(f"Unknown argument kind: {spec}") def serialize_output_spec(self, spec: ep.OutputSpec) -> OutputSpec: if spec.kind == ep.OutputKind.USER_OUTPUT: return OutputSpec.create( user_output=UserOutputSpec(arg=self.serialize_argument_spec(spec.arg)) ) elif spec.kind == ep.OutputKind.LOSS_OUTPUT: assert isinstance(spec.arg, ep.TensorArgument) return OutputSpec.create( loss_output=LossOutputSpec(arg=TensorArgument(name=spec.arg.name)) ) elif spec.kind == ep.OutputKind.BUFFER_MUTATION: assert spec.target is not None assert isinstance(spec.arg, ep.TensorArgument) return OutputSpec.create( buffer_mutation=BufferMutationSpec( arg=TensorArgument(name=spec.arg.name), buffer_name=spec.target, ) ) elif spec.kind == ep.OutputKind.GRADIENT_TO_PARAMETER: assert spec.target is not None assert isinstance(spec.arg, ep.TensorArgument) return OutputSpec.create( gradient_to_parameter=GradientToParameterSpec( arg=TensorArgument(name=spec.arg.name), parameter_name=spec.target, ) ) elif spec.kind == ep.OutputKind.GRADIENT_TO_USER_INPUT: assert spec.target is not None assert isinstance(spec.arg, ep.TensorArgument) return OutputSpec.create( gradient_to_user_input=GradientToUserInputSpec( arg=TensorArgument(name=spec.arg.name), user_input_name=spec.target, ) ) elif spec.kind == ep.OutputKind.USER_INPUT_MUTATION: assert spec.target is not None assert isinstance(spec.arg, ep.TensorArgument) return OutputSpec.create( user_input_mutation=UserInputMutationSpec( arg=TensorArgument(name=spec.arg.name), user_input_name=spec.target, ) ) elif spec.kind == ep.OutputKind.TOKEN: assert isinstance(spec.arg, ep.TokenArgument) return OutputSpec.create( token=OutputTokenSpec( arg=TokenArgument(name=spec.arg.name), ) ) else: raise AssertionError(f"Unknown argument kind: {spec}") def serialize_signature(self, sig: ep.ExportGraphSignature) -> GraphSignature: return GraphSignature( input_specs=[self.serialize_input_spec(s) for s in sig.input_specs], output_specs=[self.serialize_output_spec(s) for s in sig.output_specs], ) def serialize_argument_spec(self, x: ep.ArgumentSpec) -> Argument: if isinstance(x, ep.TensorArgument): return Argument.create(as_tensor=TensorArgument(name=x.name)) elif isinstance(x, ep.SymIntArgument): return Argument.create(as_sym_int=SymIntArgument.create(as_name=x.name)) elif isinstance(x, ep.ConstantArgument): return self.serialize_input(x.value) elif isinstance(x, ep.CustomObjArgument): return Argument.create( as_custom_obj=CustomObjArgument(name=x.name, class_fqn=x.class_fqn) ) else: raise AssertionError("TODO") def serialize_module_call_signature( self, module_call_signature: ep.ModuleCallSignature ) -> ModuleCallSignature: return ModuleCallSignature( inputs=[ self.serialize_argument_spec(x) for x in module_call_signature.inputs ], outputs=[ self.serialize_argument_spec(x) for x in module_call_signature.outputs ], in_spec=treespec_dumps(module_call_signature.in_spec, TREESPEC_VERSION), out_spec=treespec_dumps(module_call_signature.out_spec, TREESPEC_VERSION), ) def serialize_module_call_graph( self, module_call_graph: List[ep.ModuleCallEntry] ) -> List[ModuleCallEntry]: return [ ModuleCallEntry( fqn=entry.fqn, signature=( self.serialize_module_call_signature(entry.signature) if entry.signature else None ), ) for entry in module_call_graph ] def serialize_outputs(self, node: torch.fx.Node) -> List[Argument]: """For a given node, return the dataclass representing its output values. [NOTE: Multiple outputs] We handle aggregates differently than FX. For FX, it looks like: x = call_function("multiple_return", ...) element0 = call_function(getitem, x, 0) foo = call_function("use_output", element0) We do not want the intermediate `getitem` call, so our serialized thing looks like: element0, element1, element2 = call_function("multiple_return", ...) foo = call_function("use_output", element0) We want names to be consistent across these two schemes, so that we can mostly reuse the names coming from FX. This function computes a mapping from the FX representation to our representation, preserving the names. """ assert node.op == "call_function" and isinstance(node.target, (torch._ops.OpOverload, *_registered_extension_types())) schema = _get_schema_from_target(node.target) returns = schema.returns if len(returns) == 0: return [] meta_val = node.meta["val"] # Check single value return if _is_single_tensor_list_return(node.target): # e.g "-> Tensor[]" tensor_args = [] for idx, meta in enumerate(meta_val): name = self._output_node_name_at_index(node, idx) tensor_args.append(self.serialize_tensor_output(name, meta)) return [Argument.create(as_tensors=tensor_args)] elif len(returns) == 1: return [self.serialize_output(node.name, meta_val)] # There are a two possibilities at this point: # - This operator returns a tuple of Tensors, e.g. "-> (Tensor, Tensor)" # - This operator returns a tuple of mixed of Tensor and Tensors, e.g. "-> (Tensor, Tensor[])" # # Either way, start by gathering a list of TensorArguments with the correct names. # For consistent naming with FX, consult the downstream `getitem` node and # make sure our outputs have the same name. output_arguments = [] for idx, (meta, return_schema) in enumerate(zip(meta_val, returns)): if meta is None: assert isinstance( return_schema.real_type, (torch.OptionalType, torch.TensorType) ) # When the return type is annoated as Tensor type, the op can also return an # undefined Tensor which will be implicitly converted to None in Python. output_arguments.append(Argument.create(as_none=())) elif isinstance(meta, FakeTensor): assert isinstance(return_schema.real_type, (torch.OptionalType, torch.TensorType)) name = self._output_node_name_at_index(node, idx) output_arguments.append(self.serialize_output(name, meta)) elif isinstance(meta, list): # for List[Tensor] return type assert isinstance( return_schema.real_type, torch.ListType ) and isinstance( return_schema.real_type.getElementType(), torch.TensorType ) user_node = self._output_node_at_index(node, idx) assert user_node is not None args = [] for i, m in enumerate(meta): if m is None: continue sub_user_node_name = self._output_node_name_at_index(user_node, i) args.append(self.serialize_tensor_output(sub_user_node_name, m)) output_arguments.append(Argument.create(as_tensors=args)) elif isinstance(meta, (int, SymInt)): user_node_name = self._output_node_name_at_index(node, idx) output_arguments.append(self.serialize_output(user_node_name, meta)) else: raise ValueError( f"Unhandled output type {type(meta)} from node {node.format_node()}" ) return output_arguments def serialize_hoo_outputs(self, node: torch.fx.Node) -> List[Argument]: """ For serializing HOO outputs since HOOs do not have a schema. """ meta_val = node.meta["val"] if isinstance(meta_val, tuple): # Note: Since we don't have a schema, we just serialize all tuple # outputs to be a list of values. Even if the output is supposed to # be a tensor list (Tensor[]), we will serialize it to be a list of # tensors (Tensor, Tensor, Tensor). An exception is that if there's # a singleton tensor, we will serialize this to be a singleton # tensor list so that the deserializer knows to insert getitem nodes. if len(meta_val) == 1: assert isinstance(meta_val[0], torch.Tensor) name = self._output_node_name_at_index(node, 0) return [Argument.create(as_tensors=[self.serialize_tensor_output(name, meta_val[0])])] outputs = [] for i, element_meta_val in enumerate(meta_val): user_node = self._output_node_at_index(node, i) if isinstance(element_meta_val, list): # e.g "-> Tensor[]" assert user_node is not None tensors = [] for j, m in enumerate(element_meta_val): if not isinstance(m, torch.Tensor): raise SerializeError(f"Serialize list output with type {type(m)} nyi") name = self._output_node_name_at_index(user_node, j) tensors.append(self.serialize_tensor_output(name, m)) outputs.append(Argument.create(as_tensors=tensors)) else: name = ( user_node.name if user_node is not None else f"{node.name}_unused_{i}" ) outputs.append(self.serialize_output(name, element_meta_val)) return outputs else: return [self.serialize_output(node.name, meta_val)] def serialize_output(self, name: str, meta_val: Any) -> Argument: # Check single value return if meta_val is None: return Argument.create(as_none=()) if isinstance(meta_val, torch.Tensor): # e.g "-> Tensor" return Argument.create( as_tensor=self.serialize_tensor_output(name, meta_val) ) elif isinstance(meta_val, (int, torch.SymInt)): # e.g "-> SymInt" return Argument.create( as_sym_int=self.serialize_sym_int_output(name, meta_val) ) elif isinstance(meta_val, torch.SymBool): # e.g "-> SymBool" return Argument.create( as_sym_bool=self.serialize_sym_bool_output(name, meta_val) ) # list outputs should've been handled earlier raise SerializeError(f"Unable to serialize output {meta_val}") def _handle_getitem_users(self, node: torch.fx.Node) -> List[TensorArgument]: meta_val = node.meta["val"] idx_to_name = {} for user in node.users: assert ( user.target is operator.getitem ), f"User node {user} of {node} is incorrect" idx_to_name[user.args[1]] = user.name for idx, _ in enumerate(meta_val): # FX does not emit a getitem node for any outputs that are unused. # However, we need a name for them so that the number of outputs will # correctly match the schema. Just assign a dummy name. if idx not in idx_to_name: idx_to_name[idx] = f"{node.name}_unused_{idx}" arg_list = [] for i, element_meta_val in enumerate(meta_val): arg_list.append( self.serialize_tensor_output(idx_to_name[i], element_meta_val) ) return arg_list def serialize_graph(self, graph_module: torch.fx.GraphModule) -> Graph: assert isinstance(graph_module, torch.fx.GraphModule) for node in graph_module.graph.nodes: try: getattr(self, f"handle_{node.op}")(node) except Exception as e: raise SerializeError( f"Failed serializing node {node} in graph: {node.format_node()}\n Original exception {traceback.format_exc()}" ) from e return Graph( inputs=self.graph_state.inputs, nodes=self.graph_state.nodes, tensor_values=self.graph_state.tensor_values, sym_int_values=self.graph_state.sym_int_values, sym_bool_values=self.graph_state.sym_bool_values, custom_obj_values=self.graph_state.custom_obj_values, outputs=self.graph_state.outputs, is_single_tensor_return=self.graph_state.is_single_tensor_return, ) def serialize_graph_module_metadata(self, meta: Dict[str, Any]): ret = {} if custom := meta.get("custom"): try: ret["custom"] = json.dumps(custom) except Exception as e: raise SerializeError( f"Failed to serialize custom metadata for graph with error {e}" ) from e return ret def serialize(self, graph_module: torch.fx.GraphModule) -> GraphModule: graph = self.serialize_graph(graph_module) return GraphModule( graph=graph, signature=self.serialize_signature(self.graph_signature), module_call_graph=self.serialize_module_call_graph(self.module_call_graph), metadata=self.serialize_graph_module_metadata(graph_module.meta) ) @final class ExportedProgramSerializer(metaclass=Final): def __init__(self, opset_version: Optional[Dict[str, int]] = None): self.opset_version: Dict[str, int] = {} if opset_version: self.opset_version.update(opset_version) if "aten" not in self.opset_version: self.opset_version["aten"] = torch._C._get_max_operator_version() def serialize(self, exported_program: ep.ExportedProgram) -> _SerializedProgram: """ Args: exported_program: Exported Program to serialize """ exported_program.validate() gm_serializer = GraphModuleSerializer( exported_program.graph_signature, exported_program.module_call_graph ) serialized_graph_module = gm_serializer.serialize(exported_program.graph_module) serialized_range_constraints = serialize_range_constraints( exported_program.range_constraints ) # TODO: Directly serialize exported_program.constants once # CustomClassHolders get stored in the ExportedProgram rather than in # the graph constants = {} for n, c in gm_serializer.custom_objs.items(): constants[n] = c for n, t in exported_program.constants.items(): assert n not in constants constants[n] = t serialized_ep = ExportedProgram( graph_module=serialized_graph_module, opset_version=self.opset_version, range_constraints=serialized_range_constraints, schema_version=SchemaVersion( major=SCHEMA_VERSION[0], minor=SCHEMA_VERSION[1], ), verifiers=[v.dialect for v in exported_program.verifiers], torch_version=torch.__version__, ) # Test canonical form is well defined. canonicalize(serialized_ep) # Proxy cannot be dumped, so we remove them. new_state_dict = remove_proxy_from_state_dict( exported_program.state_dict, in_place=False ) return _SerializedProgram( serialized_ep, serialize_torch_artifact(new_state_dict), serialize_torch_artifact(constants), serialize_torch_artifact(exported_program.example_inputs), ) @final class GraphModuleDeserializer(metaclass=Final): @dataclasses.dataclass class Result: graph_module: torch.fx.GraphModule signature: ep.ExportGraphSignature module_call_graph: List[ep.ModuleCallEntry] names_to_symbols: Dict[str, sympy.Symbol] state_dict: Dict[str, Union[torch.Tensor, torch.nn.Parameter]] constants: Dict[str, Union[torch.Tensor, FakeScriptObject, torch.ScriptObject]] example_inputs: Optional[Tuple[Tuple[torch.Tensor, ...], Dict[str, Any]]] def __init__(self) -> None: self.serialized_name_to_node: Dict[str, torch.fx.Node] = {} self.serialized_name_to_meta: Dict[str, MetaType] = {} self.graph = torch.fx.Graph() self.module = torch.nn.Module() @contextmanager def save_graph_module(self) -> Iterator[None]: saved = ( self.graph, self.module, self.serialized_name_to_node, self.serialized_name_to_meta, ) self.graph = torch.fx.Graph() self.module = torch.nn.Module() self.serialized_name_to_node = {} self.serialized_name_to_meta = {} try: yield finally: ( self.graph, self.module, self.serialized_name_to_node, self.serialized_name_to_meta, ) = saved def deserialize_extension_operator(self, serialized_target: str): namespace, op_name = serialized_target.split(":") namespace = namespace[1:] # starting with # handler = _deserialization_registry[namespace] return handler.from_op_name(op_name) def deserialize_operator(self, serialized_target: str): if serialized_target.startswith( "_operator" ): # TODO(zhxchen17) Follow up on this. module = operator serialized_target_names = serialized_target.split(".")[1:] elif serialized_target.startswith("torch"): module = torch # type: ignore[misc] serialized_target_names = serialized_target.split(".")[1:] elif serialized_target.startswith("#"): return self.deserialize_extension_operator(serialized_target) else: # TODO(zhxchen17) Don't catch all here. return serialized_target target = module for name in serialized_target_names: if not hasattr(target, name): return serialized_target else: target = getattr(target, name) return target def deserialize_sym_int(self, s: SymInt) -> Union[int, torch.SymInt]: val = s.value if s.type == "as_expr": if val.hint is None: hint = None else: assert val.hint.type == "as_int" hint = val.hint.value if val.expr_str in self.symbol_name_to_symbol: sym = self.symbol_name_to_symbol[val.expr_str] else: sym = sympy.sympify( val.expr_str, locals={**self.sympy_functions, **self.symbol_name_to_symbol}, ) # NOTE(avik): Assumptions on symbols are not explicitly serialized. # This seems dangerous: it might cause unknown differences in shape env behavior # on deserialization? Probably deserves a follow-up. # Here we force symbols corresponding to SymInts to be at least integers. # Otherwise some expressions that the shape env would otherwise evaluate to False, # e.g., 2*s = 9, can have rational solutions, e.g., 9/2. # TODO: This is HIGHLY SUSPICIOUS ezyang(May 2024) sym = sym.subs( {s: sympy.Symbol(s.name, integer=True) for s in sym.free_symbols} ) # We need to check if the symbol has already been allocated, # self.symbol_name_to_symbol is not enough because the # integer-ification of symbols can induce simplification; # e.g., (2**s0 + 1) // 2 --> s0 when we know s0 is integral if isinstance(sym, sympy.Symbol) and sym not in self.shape_env.var_to_val: self.symbol_name_to_symbol[val.expr_str] = sym if hint is not None: self.shape_env.add_var_to_val(sym, hint) if vr := self.symbol_name_to_range.get(val.expr_str): self.shape_env.constrain_symbol_range( sym, compiler_min=vr.lower, # type: ignore[arg-type] compiler_max=vr.upper, # type: ignore[arg-type] ) else: # Placeholders, in particular, can have shapes as symbolic expressions. # We need to populate the shape env with the range constraints of their # free symbols, otherwise evaluating such expressions will error. self.symbol_name_to_symbol[val.expr_str] = sym free_symbols = sym.free_symbols for s in free_symbols: if s.name not in self.symbol_name_to_symbol: self.symbol_name_to_symbol[s.name] = s # type: ignore[assignment] if vr := self.symbol_name_to_range.get(s.name): self.shape_env.constrain_symbol_range( s, compiler_min=vr.lower, # type: ignore[arg-type] compiler_max=vr.upper, # type: ignore[arg-type] ) return self.shape_env.create_symintnode(sym, hint=hint) elif s.type == "as_int": assert isinstance(val, int) return val else: raise SerializeError( f"SymInt has invalid field type {s.type} with value {s.value}" ) def deserialize_sym_bool(self, s: SymBool) -> Union[bool, torch.SymBool]: val = s.value if s.type == "as_expr": # first we sympify this just to access any untracked symbols expr = sympy.sympify(val.expr_str) for sym in expr.free_symbols: if ( not isinstance(sym, sympy.Number) and str(sym) not in self.symbol_name_to_symbol ): self.deserialize_sym_int(SymInt.create(as_expr=SymExpr(str(sym)))) # then we sympify again using locals to correctly reify with the constructed symbols expr = sympy.sympify(val.expr_str, locals=self.symbol_name_to_symbol) return self.shape_env.create_symboolnode(expr) elif s.type == "as_bool": assert isinstance(val, bool) return val else: raise SerializeError( f"SymBool has invalid field type {s.type} with value {s.value}" ) def deserialize_tensor_meta( self, tensor_meta: TensorMeta, ) -> FakeTensor: with self.fake_tensor_mode: return cast( FakeTensor, torch.empty_strided( tuple(self.deserialize_sym_int(val) for val in tensor_meta.sizes), # type: ignore[misc] tuple(self.deserialize_sym_int(val) for val in tensor_meta.strides), # type: ignore[misc] device=deserialize_device(tensor_meta.device), dtype=_SERIALIZE_TO_TORCH_DTYPE[tensor_meta.dtype], ), ) def deserialize_script_obj_meta( self, script_obj_meta: CustomObjArgument ) -> ep.CustomObjArgument: return ep.CustomObjArgument( name=script_obj_meta.name, class_fqn=script_obj_meta.class_fqn, ) def deserialize_graph_output(self, output) -> Optional[Union[torch.fx.Node, int]]: if output.type == "as_tensor": return self.serialized_name_to_node[output.as_tensor.name] elif output.type == "as_sym_int": return self.serialized_name_to_node[output.as_sym_int.as_name] elif output.type == "as_sym_bool": return self.serialized_name_to_node[output.as_sym_bool.as_name] elif output.type == "as_int": return output.as_int elif output.type == "as_none": return None else: raise SerializeError(f"Unable to deserialize output node {output}") def deserialize_graph(self, serialized_graph: Graph) -> torch.fx.Graph: # Handle the tensor metas. for name, tensor_value in serialized_graph.tensor_values.items(): meta_val = self.deserialize_tensor_meta(tensor_value) self.serialized_name_to_meta[name] = meta_val for name, sym_int_value in serialized_graph.sym_int_values.items(): self.serialized_name_to_meta[name] = self.deserialize_sym_int(sym_int_value) for name, sym_bool_value in serialized_graph.sym_bool_values.items(): self.serialized_name_to_meta[name] = self.deserialize_sym_bool( sym_bool_value ) for name, script_obj_meta in serialized_graph.custom_obj_values.items(): self.serialized_name_to_meta[name] = self.deserialize_script_obj_meta( script_obj_meta ) # Inputs: convert to placeholder nodes in FX. for i, input_ in enumerate(serialized_graph.inputs): if input_.type in ("as_tensor", "as_sym_int", "as_custom_obj"): node_name = input_.value.name placeholder_node = self.graph.placeholder(node_name) # FX might declare a name illegal (e.g. some nn.Modules use "input" as forward() arguments) # we will overwrite it placeholder_node.name = node_name self.sync_fx_node(node_name, placeholder_node) elif input_.type in ( "as_int", "as_float", "as_bool", "as_none", "as_string", ): node_name = self.signature.input_specs[i].arg.name placeholder_node = self.graph.placeholder(node_name) placeholder_node.meta["val"] = self.deserialize_input(input_) else: raise SerializeError(f"Invalid input type {input_}") # Nodes: convert to call_function nodes. for serialized_node in serialized_graph.nodes: try: target = self.deserialize_operator(serialized_node.target) self.deserialize_node(serialized_node, target) except Exception as e: raise SerializeError( f"Failed deserializing node {serialized_node}\n Original exception {traceback.format_exc()}" ) from e # Outputs: convert to a single `output` node. outputs = [] for output in serialized_graph.outputs: outputs.append(self.deserialize_graph_output(output)) if serialized_graph.is_single_tensor_return: assert len(outputs) == 1 outputs = outputs[0] # type: ignore[assignment] else: outputs = tuple(outputs) # type: ignore[assignment] output_node = self.graph.output(outputs) if serialized_graph.is_single_tensor_return: output_node.meta["val"] = output_node.args[0].meta["val"] else: output_node.meta["val"] = tuple( arg.meta["val"] if isinstance(arg, torch.fx.Node) else arg for arg in output_node.args[0] ) return self.graph def deserialize_node(self, serialized_node: Node, target: Callable) -> None: if ( target in _SYM_BOOL_OPS or target in _SYM_INT_OPS or target == torch.ops.aten.item.default # this can produce either SymInt or SymBool ): name = serialized_node.outputs[0].value.as_name args = self.deserialize_sym_op_inputs(serialized_node.inputs) fx_node = self.graph.create_node("call_function", target, args, {}, name) self.deserialize_sym_op_outputs(serialized_node, fx_node) elif isinstance(target, torch._ops.HigherOrderOperator): args, kwargs = self.deserialize_hoo_inputs(serialized_node.inputs) # If HOP returns a single tensor, name the # newly-created node after it. This ensures that these tensor values # have names that are consistent with serialized. # # HOPs don't have schema yet, just check the output lengths and as_tensor attribute name = ( serialized_node.outputs[0].as_tensor.name if len(serialized_node.outputs) == 1 and hasattr(serialized_node.outputs[0], "as_tensor") else None ) fx_node = self.graph.create_node( "call_function", target, args, kwargs, name ) self.deserialize_outputs(serialized_node, fx_node) fx_node.meta.update(self.deserialize_metadata(serialized_node.metadata)) elif isinstance(target, (torch._ops.OpOverload, *_registered_extension_types())): # For convenience: if this node returns a single tensor, name the # newly-created node after it. This ensures that these tensor values # have names that are consistent with serialized. name = ( serialized_node.outputs[0].as_tensor.name if _is_single_tensor_return(target) else None # FX will generate a name for us. ) args, kwargs = self.deserialize_inputs(target, serialized_node) fx_node = self.graph.create_node( "call_function", target, args, kwargs, name ) self.deserialize_outputs(serialized_node, fx_node) else: raise SerializeError( f"Unsupported target type for node {serialized_node}: {type(target)}" ) fx_node.meta.update(self.deserialize_metadata(serialized_node.metadata)) if fx_node.op not in ["placeholder", "output"] and "nn_module_stack" not in fx_node.meta: fx_node.meta["nn_module_stack"] = {} # serialization throws away empty dicts def deserialize_input_spec(self, i: InputSpec) -> ep.InputSpec: if i.type == "user_input": return ep.InputSpec( kind=ep.InputKind.USER_INPUT, arg=self.deserialize_argument_spec(i.user_input.arg), target=None, ) elif i.type == "parameter": return ep.InputSpec( kind=ep.InputKind.PARAMETER, arg=ep.TensorArgument(name=i.parameter.arg.name), target=i.parameter.parameter_name, ) elif i.type == "buffer": return ep.InputSpec( kind=ep.InputKind.BUFFER, arg=ep.TensorArgument(name=i.buffer.arg.name), target=i.buffer.buffer_name, persistent=i.buffer.persistent, ) elif i.type == "tensor_constant": return ep.InputSpec( kind=ep.InputKind.CONSTANT_TENSOR, arg=ep.TensorArgument(name=i.tensor_constant.arg.name), target=i.tensor_constant.tensor_constant_name, ) elif i.type == "custom_obj": return ep.InputSpec( kind=ep.InputKind.CUSTOM_OBJ, arg=ep.CustomObjArgument( name=i.custom_obj.arg.name, class_fqn=i.custom_obj.arg.class_fqn ), target=i.custom_obj.custom_obj_name, ) elif i.type == "token": return ep.InputSpec( kind=ep.InputKind.TOKEN, arg=ep.TokenArgument(name=i.token.arg.name), target=None ) elif i.type == "constant_input": return ep.InputSpec( kind=ep.InputKind.USER_INPUT, arg=ep.ConstantArgument( name=i.constant_input.name, value=self.deserialize_constant_input(i.constant_input.value) ), target=None, ) else: raise AssertionError(f"Unknown input spec {i}") def deserialize_output_spec(self, o: OutputSpec) -> ep.OutputSpec: if o.type == "user_output": return ep.OutputSpec( kind=ep.OutputKind.USER_OUTPUT, arg=self.deserialize_argument_spec(o.user_output.arg), target=None, ) elif o.type == "loss_output": return ep.OutputSpec( kind=ep.OutputKind.LOSS_OUTPUT, arg=ep.TensorArgument(name=o.loss_output.arg.name), target=None, ) elif o.type == "buffer_mutation": return ep.OutputSpec( kind=ep.OutputKind.BUFFER_MUTATION, arg=ep.TensorArgument(name=o.buffer_mutation.arg.name), target=o.buffer_mutation.buffer_name, ) elif o.type == "gradient_to_parameter": return ep.OutputSpec( kind=ep.OutputKind.GRADIENT_TO_PARAMETER, arg=ep.TensorArgument(name=o.gradient_to_parameter.arg.name), target=o.gradient_to_parameter.parameter_name, ) elif o.type == "gradient_to_user_input": return ep.OutputSpec( kind=ep.OutputKind.GRADIENT_TO_USER_INPUT, arg=ep.TensorArgument(name=o.gradient_to_user_input.arg.name), target=o.gradient_to_user_input.user_input_name, ) elif o.type == "user_input_mutation": return ep.OutputSpec( kind=ep.OutputKind.USER_INPUT_MUTATION, arg=ep.TensorArgument(name=o.user_input_mutation.arg.name), target=o.user_input_mutation.user_input_name, ) elif o.type == "token": return ep.OutputSpec( kind=ep.OutputKind.TOKEN, arg=ep.TokenArgument(name=o.token.arg.name), target=None ) else: raise AssertionError(f"Unknown output spec {o}") def deserialize_signature(self, sig: GraphSignature) -> ep.ExportGraphSignature: return ep.ExportGraphSignature( input_specs=[self.deserialize_input_spec(i) for i in sig.input_specs], output_specs=[self.deserialize_output_spec(o) for o in sig.output_specs], ) def deserialize( self, serialized_graph_module: GraphModule, serialized_state_dict: Union[Dict[str, torch.Tensor], bytes], constants: Union[Dict[str, Any], bytes], example_inputs: Optional[Union[Tuple[Tuple[torch.Tensor, ...], Dict[str, Any]], bytes]] = None, symbol_name_to_range: Optional[Dict[str, symbolic_shapes.ValueRanges]] = None, ) -> Result: global _CURRENT_DESERIALIZER assert _CURRENT_DESERIALIZER is None _CURRENT_DESERIALIZER = self try: self.shape_env = symbolic_shapes.ShapeEnv(assume_static_by_default=True) self.fake_tensor_mode = FakeTensorMode( allow_fallback_kernels=False, allow_non_fake_inputs=True, shape_env=self.shape_env, ) self.sympy_functions = { # all torch.utils._sympy.functions should go here # TODO(avik): find a better way to keep this collection in sync; # e.g.., `exec('from torch.utils._sympy.functions import *', ...)` # would work as long as the public API of that module is complete "FloorDiv": torch.utils._sympy.functions.FloorDiv, "ModularIndexing": torch.utils._sympy.functions.ModularIndexing, "Where": torch.utils._sympy.functions.Where, "PythonMod": torch.utils._sympy.functions.PythonMod, "Mod": torch.utils._sympy.functions.Mod, "CleanDiv": torch.utils._sympy.functions.CleanDiv, "CeilToInt": torch.utils._sympy.functions.CeilToInt, "FloorToInt": torch.utils._sympy.functions.FloorToInt, "CeilDiv": torch.utils._sympy.functions.CeilDiv, "LShift": torch.utils._sympy.functions.LShift, "RShift": torch.utils._sympy.functions.RShift, "PowByNatural": torch.utils._sympy.functions.PowByNatural, "FloatPow": torch.utils._sympy.functions.FloatPow, "FloatTrueDiv": torch.utils._sympy.functions.FloatTrueDiv, "IntTrueDiv": torch.utils._sympy.functions.IntTrueDiv, "IsNonOverlappingAndDenseIndicator": torch.utils._sympy.functions.IsNonOverlappingAndDenseIndicator, "TruncToFloat": torch.utils._sympy.functions.TruncToFloat, "TruncToInt": torch.utils._sympy.functions.TruncToInt, "RoundToInt": torch.utils._sympy.functions.RoundToInt, "RoundDecimal": torch.utils._sympy.functions.RoundDecimal, "ToFloat": torch.utils._sympy.functions.ToFloat, "Identity": torch.utils._sympy.functions.Identity, } self.symbol_name_to_symbol: Dict[str, sympy.Symbol] = {} self.constants = deserialize_torch_artifact(constants) self.signature = self.deserialize_signature(serialized_graph_module.signature) # deserialization does analysis with checks on 0/1, so we create fake range constraints and # restore the original range constraints afterwards self.symbol_name_to_range = {} if symbol_name_to_range: for k, vr in symbol_name_to_range.items(): lower = vr.lower if vr.upper >= 2: # max is >= 2, not sym bool range lower = max(2, lower) self.symbol_name_to_range[k] = symbolic_shapes.ValueRanges(_int_to_sympy_int(lower), vr.upper) if example_inputs is not None and len(example_inputs) > 0: self.example_inputs = deserialize_torch_artifact(example_inputs) else: self.example_inputs = None self.deserialize_graph(serialized_graph_module.graph) module_call_graph = self.deserialize_module_call_graph( serialized_graph_module.module_call_graph ) graph_module = ep._create_graph_module_for_export( self.module, self.graph ) meta = {} if custom := serialized_graph_module.metadata.get("custom"): meta["custom"] = json.loads(custom) graph_module.meta = meta return GraphModuleDeserializer.Result( graph_module=graph_module, signature=self.signature, module_call_graph=module_call_graph, names_to_symbols=self.symbol_name_to_symbol, state_dict=deserialize_torch_artifact(serialized_state_dict), constants=self.constants, example_inputs=self.example_inputs, ) finally: _CURRENT_DESERIALIZER = None def sync_fx_node(self, name: str, fx_node: torch.fx.Node): if name in self.serialized_name_to_node: raise SerializeError(f"Node {name} has already been deserialized before.") # overwrite name fx_node.name = name self.serialized_name_to_node[name] = fx_node assert "val" not in fx_node.meta fx_node.meta["val"] = self.serialized_name_to_meta[name] def deserialize_sym_op_inputs(self, inputs): return tuple(self.deserialize_input(input.arg) for input in inputs) def deserialize_inputs(self, target, serialized_node: Node): schema_args = _get_schema_from_target(target).arguments actual_args = { input.name: self.deserialize_input(input.arg) for input in serialized_node.inputs } args = [] kwargs = {} for schema_arg in schema_args: is_positional = ( not schema_arg.has_default_value() and not schema_arg.kwarg_only ) if is_positional: args.append(actual_args[schema_arg.name]) else: if schema_arg.name in actual_args: kwargs[schema_arg.name] = actual_args[schema_arg.name] return tuple(args), kwargs def deserialize_hoo_inputs(self, inputs: List[NamedArgument]): """ For deserializing HOO inputs since HOOs do not have a schema. """ args = [] kwargs = {} for input_ in inputs: if input_.name != "": kwargs[input_.name] = self.deserialize_input(input_.arg) else: args.append(self.deserialize_input(input_.arg)) return (tuple(args), kwargs) def deserialize_input(self, inp: Argument) -> Any: value = inp.value typ_ = inp.type if typ_ == "as_none": # None should converted as None, but is encoded as bool in serialized # Convert serialized object to torch equivalent return None elif typ_ == "as_tensor": return self.serialized_name_to_node[inp.as_tensor.name] elif typ_ == "as_scalar_type": return _SERIALIZE_TO_TORCH_DTYPE[inp.as_scalar_type] elif typ_ == "as_memory_format": return _SERIALIZE_TO_TORCH_MEMORY_FORMAT[inp.as_memory_format] elif typ_ == "as_layout": return _SERIALIZE_TO_TORCH_LAYOUT[inp.as_layout] elif typ_ == "as_graph": assert isinstance(value, GraphArgument) with self.save_graph_module(): self.deserialize_graph(value.graph) submodule = ep._create_graph_module_for_export(self.module, self.graph) self.module.register_module(value.name, submodule) return self.graph.create_node( "get_attr", value.name, name=value.name, ) elif typ_ == "as_device": return deserialize_device(inp.as_device) elif typ_ == "as_int": return inp.as_int elif typ_ == "as_float": return inp.as_float elif typ_ == "as_bool": return inp.as_bool elif typ_ == "as_string": return inp.as_string elif typ_ == "as_sym_int": return self.deserialize_sym_argument(inp.as_sym_int) elif typ_ == "as_sym_bool": return self.deserialize_sym_argument(inp.as_sym_bool) elif isinstance(value, list): if len(value) == 0: return [] elif typ_ == "as_tensors": result = [] for arg in value: result.append(self.serialized_name_to_node[arg.name]) return result elif typ_ in ("as_ints", "as_floats", "as_bools", "as_strings"): # convert from serialized.python.types.List to python list return list(value) elif typ_ in ("as_sym_ints", "as_sym_bools"): return [self.deserialize_sym_argument(arg) for arg in value] elif typ_ == "as_optional_tensors": def deserialize_optional_tensor_args(a): if a.type == "as_none": return None elif a.type == "as_tensor": return self.serialized_name_to_node[a.value.name] else: raise SerializeError(f"Unhandled argument {inp}") return list(map(deserialize_optional_tensor_args, value)) else: raise SerializeError(f"Unhandled argument {inp}") elif typ_ == "as_custom_obj": if inp.as_custom_obj.name in self.serialized_name_to_node: # Custom object has been lifted as an input return self.serialized_name_to_node[inp.as_custom_obj.name] return self.constants[inp.as_custom_obj.name] elif typ_ == "as_operator": return self.deserialize_operator(inp.as_operator) else: raise SerializeError(f"Unhandled argument {inp}") def deserialize_constant_input(self, inp: ConstantValue) -> Any: if inp.type == "as_int": return int(inp.as_int) elif inp.type == "as_float": return float(inp.as_float) elif inp.type == "as_string": return str(inp.as_string) elif inp.type == "as_bool": return bool(inp.as_bool) elif inp.type == "as_none": return None else: raise SerializeError(f"Unhandled constant argument {inp} to deserialize") def deserialize_sym_argument(self, sym_arg): if isinstance(sym_arg, SymIntArgument): if sym_arg.type == "as_int": return sym_arg.as_int elif sym_arg.type == "as_name": return self.serialized_name_to_node[sym_arg.as_name] elif isinstance(sym_arg, SymBoolArgument): if sym_arg.type == "as_bool": return sym_arg.as_bool elif sym_arg.type == "as_name": return self.serialized_name_to_node[sym_arg.as_name] raise SerializeError(f"Unknown symbolic argument type: {sym_arg}") def deserialize_sym_op_outputs(self, serialized_node: Node, fx_node: torch.fx.Node): self.sync_fx_node(serialized_node.outputs[0].value.as_name, fx_node) def deserialize_outputs(self, serialized_node: Node, fx_node: torch.fx.Node): # Check single value return if len(serialized_node.outputs) == 0: return if ( len(serialized_node.outputs) == 1 and serialized_node.outputs[0].type == "as_tensor" ): self.sync_fx_node(serialized_node.outputs[0].as_tensor.name, fx_node) return elif len(serialized_node.outputs) == 1 and isinstance( serialized_node.outputs[0].value, (SymIntArgument, SymBoolArgument) ): self.sync_fx_node(serialized_node.outputs[0].value.as_name, fx_node) return self.deserialize_multiple_outputs(serialized_node, fx_node) def deserialize_multiple_outputs( self, serialized_node: Node, fx_node: torch.fx.Node ) -> None: deserialized_metadata = self.deserialize_metadata(serialized_node.metadata) def generate_getitem( meta_val, fx_node: torch.fx.Node, arg: Union[TensorArgument, SymIntArgument], idx: int, ): if isinstance(arg, TensorArgument): name = arg.name elif isinstance(arg, SymIntArgument): name = arg.as_name else: raise AssertionError( f"generate_getitem got unknown argument type {type(arg)}" ) individual_output = self.graph.create_node( "call_function", operator.getitem, (fx_node, idx), name=name, ) self.sync_fx_node(name, individual_output) meta_val.append(self.serialized_name_to_meta[name]) # The derived `getitem` nodes should have the same stacktrace as the # original `fx_node` individual_output.meta.update(deserialized_metadata) def generate_getitems(meta_val, fx_node: torch.fx.Node, args): for idx, arg in enumerate(args): if isinstance(arg, Argument): arg = arg.value if isinstance(arg, (TensorArgument, SymIntArgument)): generate_getitem(meta_val, fx_node, arg, idx) elif isinstance(arg, (list, tuple)): list_output = self.graph.create_node( "call_function", operator.getitem, (fx_node, idx), ) meta_val.append([]) generate_getitems(meta_val[-1], list_output, arg) list_output.meta.update(deserialized_metadata) list_output.meta["val"] = meta_val[-1] else: raise NotImplementedError(f"Unimplemented node output type: {arg}") # Convert multiple return types to FX format. # In FX, each node only returns one value. So in order to represent # multiple return values, we have to emit a `getitem` node for each # return value. # This performs the inverse mapping of the `serialize_outputs` call in # serialization, see [NOTE: Multiple outputs] meta_val: List[Any] = [] if len(serialized_node.outputs) == 1: assert isinstance(serialized_node.outputs[0].value, list) assert isinstance(serialized_node.outputs[0].value[0], TensorArgument) generate_getitems(meta_val, fx_node, serialized_node.outputs[0].as_tensors) else: generate_getitems(meta_val, fx_node, serialized_node.outputs) # also update the metaval for `fx_node` to be a list(meta) fx_node.meta["val"] = tuple(meta_val) self.serialized_name_to_node[fx_node.name] = fx_node def deserialize_metadata(self, metadata: Dict[str, str]) -> Dict[str, Any]: ret: Dict[str, Any] = {} if stack_trace := metadata.get("stack_trace"): ret["stack_trace"] = stack_trace def deserialize_meta_func(serialized_target: str): module = None if serialized_target.startswith("torch.nn"): module = torch.nn serialized_target_names = serialized_target.split(".")[2:] elif serialized_target.startswith("torch"): module = torch serialized_target_names = serialized_target.split(".")[1:] else: return self.deserialize_operator(serialized_target) target = module for name in serialized_target_names: if not hasattr(target, name): return serialized_target else: target = getattr(target, name) return target if nn_module_stack_str := metadata.get("nn_module_stack"): # Originally serialized to "key,orig_path,type_str" def import_nn_module_stack(key, path, ty): return key, (path, ty) # Helper function that splits strings by commas except for those # encapsulated by parens, which are valid traces. # TODO: Currently this is needed due to indexing Sequential # layers introducing names in the form "layer.slice(1, None, None)". # If that naming is improved, this fancier splitting can probably be # reverted to a simple split by comma. def metadata_split(metadata): # Remove the parentheses and commas inside them metadata = re.sub(r'\(.*?\)', '', metadata) # Split the string by comma, except for those inside parentheses return re.split(r'(? ep.ArgumentSpec: if x.type == "as_tensor": return ep.TensorArgument(name=x.as_tensor.name) elif x.type == "as_sym_int": return ep.SymIntArgument(name=x.as_sym_int.as_name) elif x.type == "as_custom_obj": return ep.ConstantArgument(name=x.as_custom_obj.name, value=self.deserialize_input(x)) else: return ep.ConstantArgument(name="", value=self.deserialize_input(x)) def deserialize_module_call_signature( self, module_call_signature: ModuleCallSignature ) -> ep.ModuleCallSignature: return ep.ModuleCallSignature( inputs=[ self.deserialize_argument_spec(x) for x in module_call_signature.inputs ], outputs=[ self.deserialize_argument_spec(x) for x in module_call_signature.outputs ], in_spec=treespec_loads(module_call_signature.in_spec), out_spec=treespec_loads(module_call_signature.out_spec), ) def deserialize_module_call_graph( self, module_call_graph: List[ModuleCallEntry] ) -> List[ep.ModuleCallEntry]: return [ ep.ModuleCallEntry( fqn=entry.fqn, signature=( self.deserialize_module_call_signature(entry.signature) if entry.signature else None ), ) for entry in module_call_graph ] @final class ExportedProgramDeserializer(metaclass=Final): def __init__(self, expected_opset_version: Optional[Dict[str, int]] = None): self.expected_opset_version: Dict[str, int] = {} if expected_opset_version: self.expected_opset_version.update(expected_opset_version) if "aten" not in self.expected_opset_version: self.expected_opset_version["aten"] = torch._C._get_max_operator_version() def deserialize_range_constraints( self, symbol_name_to_range: Dict[str, symbolic_shapes.ValueRanges], symbol_name_to_symbol: Dict[str, sympy.Symbol], ) -> Dict[sympy.Symbol, ValueRanges]: range_constraints = {} for k, v in symbol_name_to_range.items(): if symbol := symbol_name_to_symbol.get(k): range_constraints[symbol] = v # type: ignore[arg-type] else: log.warning(f"Symbol {k} did not appear in the graph that was deserialized") # noqa: G004 return range_constraints def deserialize( self, exported_program: ExportedProgram, state_dict: Union[Dict[str, torch.Tensor], bytes], constants: Union[Dict[str, torch.Tensor], bytes], example_inputs: Optional[Union[Tuple[Tuple[torch.Tensor, ...], Dict[str, Any]], bytes]] = None, ) -> ep.ExportedProgram: assert isinstance(exported_program, ExportedProgram) version = exported_program.schema_version # TODO(zhxchen17) blocked on thrift schema refactor if version.major != SCHEMA_VERSION[0] and not (version.major == 0 and version.minor == 0): raise SerializeError( f"Serialized schema version {exported_program.schema_version} " f"does not match our current schema version {SCHEMA_VERSION}." ) symbol_name_to_range = { k: symbolic_shapes.ValueRanges( _int_to_sympy_int(v.min_val), _int_to_sympy_int(v.max_val) ) for k, v in exported_program.range_constraints.items() } res = ( GraphModuleDeserializer() .deserialize( exported_program.graph_module, state_dict, constants, example_inputs, symbol_name_to_range, ) ) range_constraints = self.deserialize_range_constraints( symbol_name_to_range, res.names_to_symbols, ) return ep.ExportedProgram( root=res.graph_module, graph=res.graph_module.graph, graph_signature=res.signature, state_dict=res.state_dict, # type: ignore[arg-type] range_constraints=range_constraints, module_call_graph=res.module_call_graph, example_inputs=res.example_inputs, constants=res.constants, verifiers=[load_verifier(v) for v in exported_program.verifiers], ) class EnumEncoder(json.JSONEncoder): def default(self, obj): if isinstance(obj, Enum): return obj.value if isinstance(obj, bytes): return base64.b64encode(obj).decode("utf-8") return super().default(obj) def _dataclass_to_dict(obj): if isinstance(obj, _Union): return {obj.type: _dataclass_to_dict(obj.value)} elif dataclasses.is_dataclass(obj): return { f.name: _dataclass_to_dict(getattr(obj, f.name)) for f in dataclasses.fields(obj) if not (f.default is None and getattr(obj, f.name) is None) } elif isinstance(obj, list): return [_dataclass_to_dict(x) for x in obj] elif isinstance(obj, tuple): return tuple(_dataclass_to_dict(x) for x in obj) elif isinstance(obj, dict): return {k: _dataclass_to_dict(v) for k, v in obj.items()} else: return obj def serialize( exported_program: ep.ExportedProgram, opset_version: Optional[Dict[str, int]] = None, ) -> SerializedArtifact: serialized_program = ExportedProgramSerializer(opset_version).serialize( exported_program ) assert isinstance(serialized_program.exported_program, ExportedProgram) json_program = json.dumps( _dataclass_to_dict(serialized_program.exported_program), cls=EnumEncoder ) json_bytes = json_program.encode("utf-8") artifact = SerializedArtifact( json_bytes, serialized_program.state_dict, serialized_program.constants, serialized_program.example_inputs ) return artifact def _dict_to_dataclass(cls, data): assert not isinstance(cls, str), f"Unresolved class type: '{cls}'." if typing.get_origin(cls) == typing.Union and type(None) in typing.get_args(cls): if data is None: return None ty_args = typing.get_args(cls) assert len(ty_args) == 2 return _dict_to_dataclass(ty_args[0], data) elif isinstance(cls, type) and issubclass(cls, _Union): assert isinstance(data, dict) assert len(data) == 1 _type = next(iter(data.keys())) _value = next(iter(data.values())) assert isinstance(_type, str) field_type = cls.__annotations__[_type] return cls.create(**{_type: _dict_to_dataclass(field_type, _value)}) elif dataclasses.is_dataclass(cls): obj = cls(**data) # type: ignore[assignment] type_hints = typing.get_type_hints(cls) for f in dataclasses.fields(cls): name = f.name new_field_obj = _dict_to_dataclass(type_hints[name], getattr(obj, name)) setattr(obj, name, new_field_obj) return obj elif isinstance(data, list): if len(data) == 0: return data d_type = typing.get_args(cls)[0] return [_dict_to_dataclass(d_type, d) for d in data] elif isinstance(data, dict): v_type = typing.get_args(cls)[1] return {k: _dict_to_dataclass(v_type, v) for k, v in data.items()} return data def deserialize( artifact: SerializedArtifact, expected_opset_version: Optional[Dict[str, int]] = None, ) -> ep.ExportedProgram: assert isinstance(artifact.exported_program, bytes) exported_program_str = artifact.exported_program.decode("utf-8") exported_program_dict = json.loads(exported_program_str) serialized_exported_program = _dict_to_dataclass(ExportedProgram, exported_program_dict) return ( ExportedProgramDeserializer(expected_opset_version) .deserialize( serialized_exported_program, artifact.state_dict, artifact.constants, artifact.example_inputs, ) ) def _canonicalize_graph( sorted_inputs, sorted_outputs, graph ) -> Tuple[Graph, Dict[str, str]]: def _get_argument(a: Argument): if a.type == "as_none": return None elif a.type == "as_tensor": return a.as_tensor elif a.type == "as_tensors": return a.as_tensors elif a.type == "as_int": return None elif a.type == "as_ints": return None elif a.type == "as_float": return None elif a.type == "as_floats": return None elif a.type == "as_string": return None elif a.type == "as_strings": return None elif a.type == "as_sym_int": return a.as_sym_int elif a.type == "as_sym_ints": return a.as_sym_ints elif a.type == "as_scalar_type": return None elif a.type == "as_memory_format": return None elif a.type == "as_layout": return None elif a.type == "as_device": return None elif a.type == "as_bool": return None elif a.type == "as_bools": return None elif a.type == "as_sym_bool": return a.as_sym_bool elif a.type == "as_sym_bools": return a.as_sym_bools elif a.type == "as_graph": return None elif a.type == "as_optional_tensors": return a.as_optional_tensors elif a.type == "as_custom_obj": return None elif a.type == "as_operator": return None else: raise AssertionError(f"Unknown input type to the ExportedProgram: {a}") # Stage 1: Reorder named items. def for_args(f, a): assert isinstance(a, Argument) pytree.tree_map(f, _get_argument(a)) def sort_nodes(nodes): @dataclass class Edges: outs: List[int] ins: int graph_inputs: Set[str] = set() def_table: Dict[str, int] = {} edges: Dict[int, Edges] = {} candidates: List[Tuple[str, List[Tuple[str, List[int]]], int]] = [] rank: Dict[str, int] = {} ret: List[Node] = [] def get_name(a) -> Optional[str]: if a is None: return None if isinstance(a, TensorArgument): return a.name elif isinstance(a, (SymIntArgument, SymBoolArgument)): if a.type == "as_name": return a.as_name elif a.type in ("as_int", "as_bool"): return None else: raise AssertionError(f"Unknown argument type: {a}") elif isinstance(a, OptionalTensorArgument): if a.type == "as_tensor": return a.as_tensor.name elif a.type == "as_none": return None else: raise AssertionError(f"Unknown optional tensor type: {a}") else: raise AssertionError(f"Unknown argument type: {a}") for i in sorted_inputs: def add_input(a): if s := get_name(a): graph_inputs.add(s) for_args(add_input, i) for idx, node in enumerate(nodes): def add_def(a): if s := get_name(a): assert s not in def_table def_table[s] = idx for o in node.outputs: for_args(add_def, o) edges[idx] = Edges([], 0) for idx, user in enumerate(nodes): def add_edge(a): if s := get_name(a): if s not in def_table: assert s in graph_inputs return src = def_table[s] edges[src].outs.append(idx) edges[idx].ins += 1 for i in user.inputs: for_args(add_edge, i.arg) def add_rank(a): if s := get_name(a): assert s not in rank rank[s] = len(rank) def get_rank(a): if s := get_name(a): return rank[s] else: return -1 for i in sorted_inputs: for_args(add_rank, i) def add_candidate(idx: int): def get_ranks(i): ranks = [] for_args(lambda x: ranks.append(get_rank(x)), i) return ranks node = nodes[idx] args_rank = [(a.name, get_ranks(a.arg)) for a in node.inputs] heapq.heappush(candidates, (node.target, args_rank, idx)) for idx, e in edges.items(): if e.ins == 0: add_candidate(idx) while len(candidates) > 0: _, _, idx = heapq.heappop(candidates) node = nodes[idx] for o in node.outputs: for_args(add_rank, o) ret.append(node) assert idx in edges for user in edges[idx].outs: e = edges[user] assert e.ins > 0 e.ins -= 1 if e.ins == 0: add_candidate(user) edges[idx].outs.clear() return ret sorted_nodes = sort_nodes(graph.nodes) assert len(sorted_nodes) == len(graph.nodes) # Stage 2: Rename nodes. name_table: Dict[str, str] = {} def rename_def(a): def _rename(arg_name, values): new_name = f"_{len(name_table)}" assert arg_name not in name_table name_table[arg_name] = new_name assert arg_name in values values[new_name] = values.pop(arg_name) return new_name if a is None: return if isinstance(a, TensorArgument): a.name = _rename(a.name, graph.tensor_values) elif isinstance(a, SymIntArgument): if a.type == "as_name": a.as_name = _rename(a.as_name, graph.sym_int_values) elif isinstance(a, SymBoolArgument): if a.type == "as_name": a.as_name = _rename(a.as_name, graph.sym_bool_values) else: raise AssertionError(f"Unknown argument type: {a}") def replace_use(a): if a is None: return if isinstance(a, TensorArgument): a.name = name_table.get(a.name, a.name) elif isinstance(a, SymIntArgument): if a.type == "as_name": a.as_name = name_table.get(a.as_name, a.as_name) elif isinstance(a, SymBoolArgument): if a.type == "as_name": a.as_name = name_table.get(a.as_name, a.as_name) elif isinstance(a, OptionalTensorArgument): if a.type == "as_tensor": a.as_tensor.name = name_table.get(a.as_tensor.name, a.as_tensor.name) else: raise AssertionError(f"Unknown argument type: {a}") for i in sorted_inputs: for_args(rename_def, i) for n in sorted_nodes: for o in n.outputs: for_args(rename_def, o) for n in sorted_nodes: for i in n.inputs: for_args(replace_use, i.arg) for o in sorted_outputs: for_args(replace_use, o) # Stage 3: Remove unstable fields. for n in sorted_nodes: n.metadata.clear() # Stage 4: Aggregate values. sorted_tensor_values = dict(sorted(graph.tensor_values.items(), key=operator.itemgetter(0))) sorted_sym_int_values = dict( sorted(graph.sym_int_values.items(), key=operator.itemgetter(0)) ) sorted_sym_bool_values = dict( sorted(graph.sym_bool_values.items(), key=operator.itemgetter(0)) ) # Stage 5: Recurse in subgraphs. counter = 0 for node in sorted_nodes: for i in node.inputs: a = i.arg if a.type == "as_graph": a.as_graph.graph, _ = _canonicalize_graph( a.as_graph.graph.inputs, a.as_graph.graph.outputs, a.as_graph.graph ) a.as_graph.name = f"_g{counter}" counter += 1 graph = Graph( inputs=sorted_inputs, outputs=sorted_outputs, nodes=sorted_nodes, tensor_values=sorted_tensor_values, sym_int_values=sorted_sym_int_values, sym_bool_values=sorted_sym_bool_values, is_single_tensor_return=graph.is_single_tensor_return, ) return graph, name_table def canonicalize(ep: ExportedProgram) -> ExportedProgram: """ Normalize a serialized ExportedProgram, so that different eager program which shares the same semantics can get a single representation on disk. This function canonicalizes an ExportedProgram by: 1. Sorting nodes in topological order. 2. Rename nodes to have unique names. 3. Remove unstable fields. 4. Aggregate the above program fields. 5. Recurse in subgraphs. Args: ep (ExportedProgram): The ExportedProgram to canonicalize. Returns: ExportedProgram: The canonicalized exported program. """ ep = copy.deepcopy(ep) opset_version = dict(sorted(ep.opset_version.items(), key=operator.itemgetter(0))) range_constraints = dict(sorted(ep.range_constraints.items(), key=operator.itemgetter(0))) module_call_graph = sorted(ep.graph_module.module_call_graph, key=lambda x: x.fqn) signature = ep.graph_module.signature graph = ep.graph_module.graph assert len(graph.inputs) == len(signature.input_specs) assert len(graph.outputs) == len(signature.output_specs) def rank_input(inp) -> Tuple[int, Optional[str], int]: idx, (arg, spec) = inp assert isinstance(spec, InputSpec) if spec.type == "user_input": return 5, None, idx elif spec.type == "parameter": return 1, spec.parameter.parameter_name, idx elif spec.type == "buffer": return 2, spec.buffer.buffer_name, idx elif spec.type == "tensor_constant": return 3, spec.tensor_constant.tensor_constant_name, idx elif spec.type == "custom_obj": return 4, spec.custom_obj.custom_obj_name, idx elif spec.type == "token": return 0, None, idx elif spec.type == "constant_input": return 6, spec.constant_input.name, idx else: raise AssertionError(f"Unknown input type: {spec}") def rank_output(out) -> Tuple[int, Optional[str], int]: idx, (arg, spec) = out assert isinstance(spec, OutputSpec) if spec.type == "user_output": return 3, None, idx elif spec.type == "loss_output": return 3, None, idx elif spec.type == "buffer_mutation": return 1, spec.buffer_mutation.buffer_name, idx elif spec.type == "gradient_to_parameter": return 4, spec.gradient_to_parameter.parameter_name, idx elif spec.type == "gradient_to_user_input": return 5, None, idx elif spec.type == "user_input_mutation": return 2, None, idx elif spec.type == "token": return 0, None, idx else: raise AssertionError(f"Unknown output type: {spec}") sorted_ins = sorted( enumerate(zip(graph.inputs, signature.input_specs)), key=rank_input ) if len(sorted_ins) > 0: sorted_inputs, input_specs = zip(*(i for idx, i in sorted_ins)) # type: ignore[assignment] else: sorted_inputs = () input_specs = () sorted_outs = sorted( enumerate(zip(graph.outputs, signature.output_specs)), key=rank_output ) sorted_outputs, output_specs = zip(*(i for idx, i in sorted_outs)) # type: ignore[assignment] sorted_graph, replace_table = _canonicalize_graph( sorted_inputs, sorted_outputs, graph ) def replace_input(inp): assert isinstance(spec, InputSpec) if spec.type == "user_input": arg = spec.user_input.arg if arg.type == "as_tensor": t = arg.as_tensor t.name = replace_table[t.name] elif arg.type == "as_sym_int": s = arg.as_sym_int if s.type == "as_name": s.as_name = replace_table[s.as_name] elif s.type == "as_int": pass else: raise AssertionError(f"Unknown sym_int type: {s}") elif arg.type in ( "as_none", "as_bool", "as_int", "as_float", "as_string", "as_custom_obj", ): return else: raise AssertionError(f"Unknown input type: {arg}") elif spec.type == "parameter": t = spec.parameter.arg t.name = replace_table[t.name] elif spec.type == "buffer": t = spec.buffer.arg t.name = replace_table[t.name] elif spec.type == "tensor_constant": t = spec.tensor_constant.arg t.name = replace_table[t.name] elif spec.type == "custom_obj": return elif spec.type == "token": tok = spec.token.arg tok.name = replace_table[tok.name] elif spec.type == "constant_input": return else: raise AssertionError(f"Unknown input type: {spec}") def replace_output(out): assert isinstance(spec, OutputSpec) if spec.type == "user_output": arg = spec.user_output.arg if arg.type == "as_tensor": t = arg.as_tensor t.name = replace_table[t.name] elif arg.type == "as_sym_int": s = arg.as_sym_int if s.type == "as_name": s.as_name = replace_table[s.as_name] elif s.type == "as_int": pass else: raise AssertionError(f"Unknown sym_int type: {s}") elif arg.type in ("as_none", "as_int", "as_float", "as_string"): return else: raise AssertionError(f"Unknown input type: {arg}") elif spec.type == "loss_output": t = spec.loss_output.arg t.name = replace_table[t.name] elif spec.type == "buffer_mutation": t = spec.buffer_mutation.arg t.name = replace_table[t.name] elif spec.type == "gradient_to_parameter": t = spec.gradient_to_parameter.arg t.name = replace_table[t.name] elif spec.type == "gradient_to_user_input": g = spec.gradient_to_user_input g.arg.name = replace_table[g.arg.name] g.user_input_name = replace_table[g.user_input_name] elif spec.type == "user_input_mutation": u = spec.user_input_mutation u.arg.name = replace_table[u.arg.name] u.user_input_name = replace_table[u.user_input_name] elif spec.type == "token": tok = spec.token.arg tok.name = replace_table[tok.name] else: raise AssertionError(f"Unknown output type: {spec}") for spec in input_specs: replace_input(spec) for spec in output_specs: replace_output(spec) return ExportedProgram( graph_module=GraphModule( graph=sorted_graph, signature=GraphSignature( input_specs=list(input_specs), output_specs=list(output_specs), ), module_call_graph=module_call_graph, ), opset_version=opset_version, range_constraints=range_constraints, schema_version=ep.schema_version, verifiers=ep.verifiers, torch_version=ep.torch_version, ) class ExtensionHandler: """ Base class for handling extension operators. """ @classmethod def namespace(cls) -> str: raise NotImplementedError(f"{cls.__class__} namespace() must be implemented") @classmethod def to_op_name(cls, op) -> str: raise NotImplementedError(f"{cls.__class__} op_name() must be implemented") @classmethod def from_op_name(cls, name: str): raise NotImplementedError(f"{cls.__class__} op_name() must be implemented") @classmethod def op_schema(cls, op) -> torch.FunctionSchema: raise NotImplementedError(f"{cls.__class__} op_schema() must be implemented") def register_extension( op_type: Type[Any], extension_handler: Type[ExtensionHandler], ): """Register custom de/serialization method for a node with non-standard type.""" assert issubclass(extension_handler, ExtensionHandler), f"Expected ExtensionHandler, got {extension_handler}." assert op_type not in _serialization_registry, f"{op_type} is already registered." assert isinstance(op_type, type) # Maybe a good idea to enforce this first. assert not (op_type.__module__.startswith("torch") or op_type.__module__.startswith("builtins")) assert extension_handler.namespace() not in _deserialization_registry _serialization_registry[op_type] = extension_handler _deserialization_registry[extension_handler.namespace()] = extension_handler def _registered_extension_types(): return tuple( _serialization_registry.keys() ) # Registry to store all custom serialization implementations. # The registry maps a operation to its serialization function (a callable), in their own # namespace to avoid conflicts. # Serialization: Op type --> custom handler. # De-serialization: Namespace --> custom handler. _serialization_registry: Dict[Type[Any], Type[ExtensionHandler]] = {} _deserialization_registry: Dict[str, Type[ExtensionHandler]] = {}