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torch-mlir/python/torch_mlir/extras/fx_importer.py

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# Copyright 2023 Advanced Micro Devices, Inc
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
# Also available under a BSD-style license. See LICENSE.
try:
from types import NoneType
except ImportError:
# python less than 3.10 doesn't have NoneType
NoneType = type(None)
import logging
import operator
import re
from dataclasses import dataclass
from types import BuiltinMethodType, BuiltinFunctionType
from typing import (
Any,
Callable,
Dict,
List,
Optional,
Sequence,
Set,
Tuple,
TYPE_CHECKING,
Union,
Iterable,
)
import weakref
import numpy as np
import torch
import torch.export
import torch.fx as torch_fx
from torch.fx.passes.shape_prop import TensorMetadata
from torch import (
dtype as TorchDtype,
FunctionSchema,
)
from torch._ops import (
OpOverload as TorchOpOverload,
HigherOrderOperator,
)
from torch._subclasses import (
FakeTensor as TorchFakeTensor,
)
from torch.fx import (
Graph,
GraphModule,
Node,
)
try:
from torch.export.graph_signature import InputSpec as TypingInputSpec
except ModuleNotFoundError:
# PyTorch prior to 2.3 is missing certain things we use in typing
# signatures. Just make them be Any.
if not TYPE_CHECKING:
TypingInputSpec = Any
else:
raise
try:
import ml_dtypes
except ModuleNotFoundError:
# The third-party ml_dtypes package provides some optional
# low precision data-types. If used in this file, it is
# conditional.
ml_dtypes = None
from torch.fx.node import (
Argument as NodeArgument,
)
from ..ir import (
Attribute,
Block,
Context,
DenseElementsAttr,
DenseResourceElementsAttr,
FloatAttr,
BF16Type,
ComplexType,
F16Type,
F32Type,
F64Type,
FunctionType,
InsertionPoint,
IntegerAttr,
IntegerType,
RankedTensorType,
Location,
Module,
Operation,
StringAttr,
SymbolTable,
Type as IrType,
UnitAttr,
Value,
)
from ..dialects import (
func as func_dialect,
)
__all__ = [
"FxImporter",
]
REQUIRED_DIALCTS = [
"builtin",
"func",
"torch",
]
TORCH_DTYPE_TO_MLIR_TYPE_ASM = {
torch.float16: "f16",
torch.bfloat16: "bf16",
torch.float32: "f32",
torch.float64: "f64",
torch.uint8: "ui8",
torch.int8: "si8",
torch.int16: "si16",
torch.int32: "si32",
torch.int64: "si64",
torch.bool: "i1",
torch.qint8: "!torch.qint8",
torch.quint8: "!torch.quint8",
torch.complex32: "complex<f16>",
torch.complex64: "complex<f32>",
torch.complex128: "complex<f64>",
}
TORCH_DTYPE_TO_MLIR_TYPE: Dict[torch.dtype, Callable[[], IrType]] = {
torch.float16: lambda: F16Type.get(),
torch.bfloat16: lambda: BF16Type.get(),
torch.float32: lambda: F32Type.get(),
torch.float64: lambda: F64Type.get(),
torch.uint8: lambda: IntegerType.get_unsigned(8),
torch.int8: lambda: IntegerType.get_signed(8),
torch.int16: lambda: IntegerType.get_signed(16),
torch.int32: lambda: IntegerType.get_signed(32),
torch.int64: lambda: IntegerType.get_signed(64),
torch.bool: lambda: IntegerType.get_signless(1),
torch.qint8: lambda: IntegerType.get_signed(8),
torch.quint8: lambda: IntegerType.get_unsigned(8),
torch.complex32: lambda: ComplexType.get(F16Type.get()),
torch.complex64: lambda: ComplexType.get(F32Type.get()),
torch.complex128: lambda: ComplexType.get(F64Type.get()),
}
TORCH_DTYPE_TO_NPY_TYPE = {
# torch.qint8: None, # no equivalent np datatype
# torch.quint8: None,
torch.uint8: np.uint8,
torch.int8: np.int8,
torch.int16: np.int16,
torch.int32: np.int32,
torch.int64: np.int64,
torch.float16: np.float16,
torch.float32: np.float32,
torch.float64: np.float64,
torch.bool: np.bool_,
# torch.complex32: None, # no equivalent precision for numpy
torch.complex64: np.complex64,
torch.complex128: np.complex128,
}
if ml_dtypes is not None:
TORCH_DTYPE_TO_NPY_TYPE[torch.bfloat16] = ml_dtypes.bfloat16
TORCH_DTYPE_TO_INT = {
torch.uint8: 0,
torch.int8: 1,
torch.int16: 2,
torch.int32: 3,
torch.int64: 4,
torch.float16: 5,
torch.float32: 6,
torch.float64: 7,
# torch.complex_half 8
torch.complex32: 9,
torch.complex64: 10,
torch.bool: 11,
# torch.qint8: 12, # quantized dtypes are not supported in all backends, currently we do not support them
# torch.quint8: 13,
# torch.qint32 14
torch.bfloat16: 15,
}
TORCH_MEMORY_FORMAT_TO_INT = {
torch.contiguous_format: 0,
torch.preserve_format: 1,
torch.channels_last: 2,
torch.channels_last_3d: 3,
}
TORCH_LAYOUT_TO_INT = {
torch.strided: 0,
torch.sparse_coo: 1,
torch.sparse_csr: 2,
torch.sparse_csc: 3,
torch.sparse_bsr: 4,
torch.sparse_bsc: 5,
}
PY_BUILTIN_TO_TORCH_OP = {
"truediv": torch.ops.aten.div,
"mul": torch.ops.aten.mul,
"add": torch.ops.aten.add,
"sub": torch.ops.aten.sub,
"lt": torch.ops.aten.lt,
"le": torch.ops.aten.le,
"ge": torch.ops.aten.ge,
"ne": torch.ops.aten.ne,
"gt": torch.ops.aten.gt,
}
# torch with cuda has a __version__ that looks like "2.1.0+cu113",
# so split by + and 0 index will always give the base version
_IS_TORCH_2_1_OR_EARLIER = torch.__version__.split("+")[0] <= "2.1.0"
# The following are maps from symbolic ops to their non symbolic equivalents.
# In <=2.1.0, imported fx graphs come with a type inspecific torch.ops.aten.sym_size
# We identify it using the number of args in the node, 1 being default, 2 being int
# In the mapping below (torch.aten.sym_size, 2) indicates len(args)=2 therefore
# map to torch.aten.size.int.
# Thankfully, newer versions provide a specific torch.ops.aten.sym_size.<type>.
# Once we drop support for <2.1.0, we can get rid of the the SYMBOLIC_TORCH_OPS
# set and just check key existence in SYMBOLIC_OP_TO_TORCH_OP
if _IS_TORCH_2_1_OR_EARLIER:
SYMBOLIC_OP_TO_TORCH_OP = {
(torch.ops.aten.sym_size, 1): torch.ops.aten.size.default,
(torch.ops.aten.sym_size, 2): torch.ops.aten.size.int,
(torch.ops.aten.sym_stride, 1): torch.ops.aten.stride.default,
(torch.ops.aten.sym_stride, 2): torch.ops.aten.stride.int,
(torch.ops.aten.sym_numel, 1): torch.ops.aten.numel.default,
}
SYMBOLIC_TORCH_OPS = {key[0] for key in SYMBOLIC_OP_TO_TORCH_OP}
else:
SYMBOLIC_OP_TO_TORCH_OP = {
torch.ops.aten.sym_size.default: torch.ops.aten.size.default,
torch.ops.aten.sym_size.int: torch.ops.aten.size.int,
torch.ops.aten.sym_stride.default: torch.ops.aten.stride.default,
torch.ops.aten.sym_stride.int: torch.ops.aten.stride.int,
torch.ops.aten.sym_numel.default: torch.ops.aten.numel.default,
}
SYMBOLIC_TORCH_OPS = {key for key in SYMBOLIC_OP_TO_TORCH_OP}
@dataclass(frozen=True)
class SparsityMeta:
"""
Class for keeping track of sparsity meta data.
NOTE: this will be fully replaced by
torch.fx.passes.shape_prop.SparseTensorMetadata
"""
layout: torch.layout
batch_dim: int
sparse_dim: int
dense_dim: int
blocksize: Optional[Tuple[int, int]]
pos_dtype: torch.dtype
crd_dtype: torch.dtype
def sparsity_encoding(shape: torch.Size, sparsity: SparsityMeta) -> str:
"""Returns sparse tensor encoding for the given sparse layout as string."""
assert sparsity is not None
# Sparse tensors have the form
# [ <batch_dimensions> , <sparse_dimensions>, <dense_dimensions> ]
# which map directly to MLIR types.
batch_dim, sparse_dim, dense_dim = (
sparsity.batch_dim,
sparsity.sparse_dim,
sparsity.dense_dim,
)
dim = batch_dim + sparse_dim + dense_dim
assert dim == len(shape)
blocksize = sparsity.blocksize
dims = ",".join(f"d{d}" for d in range(dim))
if sparsity.layout is torch.sparse_coo:
assert sparse_dim >= 2 and blocksize is None
trail_dim = batch_dim + sparse_dim - 1
coords = ",".join(
f"d{d}:singleton(nonunique,soa)" for d in range(batch_dim + 1, trail_dim)
)
sep = "," if sparse_dim > 2 else ""
lvls = f"d{batch_dim}:compressed(nonunique),{coords}{sep}d{trail_dim}:singleton(soa)"
elif sparsity.layout is torch.sparse_csr:
assert sparse_dim == 2 and blocksize is None
lvls = f"d{batch_dim}:dense,d{batch_dim+1}:compressed"
elif sparsity.layout is torch.sparse_csc:
assert sparse_dim == 2 and blocksize is None
lvls = f"d{batch_dim+1}:dense,d{batch_dim}:compressed"
else:
assert sparse_dim == 2 and blocksize is not None
if sparsity.layout is torch.sparse_bsr:
i, j = batch_dim, batch_dim + 1
else:
assert sparsity.layout is torch.sparse_bsc
j, i = batch_dim, batch_dim + 1
m, n = blocksize
lvls = (
f"d{i} floordiv {m}:dense,d{j} floordiv {n}:compressed,"
f"d{i} mod {m}:dense,d{j} mod {n}:dense"
)
if batch_dim > 0:
batch = ",".join(f"d{d}:batch" for d in range(batch_dim))
lvls = f"{batch},{lvls}"
if dense_dim > 0:
dense = ",".join(f"d{d}:dense" for d in range(batch_dim + sparse_dim, dim))
lvls = f"{lvls},{dense}"
posw = torch.iinfo(sparsity.pos_dtype).bits
crdw = torch.iinfo(sparsity.crd_dtype).bits
return f"#sparse_tensor.encoding<{{map=({dims})->({lvls}),posWidth={posw},crdWidth={crdw}}}>"
def is_symbolic(obj: Any) -> bool:
"""Check whether an object in our graph is symbolic"""
return isinstance(obj, (torch.SymInt, torch.SymFloat, torch.SymBool))
def is_builtin_function_or_method(obj: Any) -> bool:
return isinstance(obj, (BuiltinMethodType, BuiltinFunctionType))
# TODO: switch back to `slots=True` when py3.9 support is dropped
@dataclass(frozen=True)
class InputInfo:
"""Provides additional metadata when resolving inputs."""
program: torch.export.ExportedProgram
input_spec: TypingInputSpec
node: Node
ir_type: IrType
mutable_producer_node_name: Optional[str] = None
store_producer_node: Optional[str] = None
class FxImporterHooks:
"""Hooks to control the behavior of the FxImporter."""
def prepare_module(self, module_op: Operation):
"""Performs any needed preparation work on the module."""
...
def resolve_literal(
self, gni: "GraphNodeImporter", literal: Any
) -> Optional[Value]:
"""User overridable hook to resolve a literal value."""
return None
def resolve_input(
self, gni: "GraphNodeImporter", value: Any, info: InputInfo
) -> Optional[Value]:
"""Resolves a Parameter or Buffer input to an IR value.
If the 'mutable_producer_node_name' option is set, then the result must
be a `!torch.tensor`.
Otherwise, it must be an immutable `!torch.vtensor`. If this constraint cannot
be met, the implementation must either error or return None to delegate to
the default.
"""
return None
def store_produced_value(
self,
gni: "GraphNodeImporter",
py_value: Any,
produced_ir_value: Any,
info: InputInfo,
):
"""Given a load/store semantic mutatation, issues the store.
This style is used for buffer and parameter updates, which are assumed to be
non-SSA updates that are otherwise in the value-tensor domain.
"""
raise NotImplementedError(
f"Store of a mutation to {info} is not supported (from {produced_ir_value})"
)
class FxImporter:
"""Main entry-point for importing an fx.GraphModule.
The FxImporter is a low-level class intended for framework integrators.
It provides several options for customization:
* config_check: Optionally allows some per-import configuration safety
checks to be skipped.
* literal_resolver_callback: Callback that will be invoked when a literal,
live torch.Tensor is encountered in the FX graph, allowing the default
action (which is to inline the data as a DenseResourceElementsAttr) to
be completely overriden.
* py_attr_tracker: Weak reference tracker for live PyTorch objects used
to unique them with respect to attributes. If not specified, there will
be one reference tracker per import, but this can be injected to share
the same uniqueing across imports (i.e. if building multiple functions
into the same context or module).
"""
__slots__ = [
"_c",
"_cc",
"_m",
"_m_ip",
"_py_attr_tracker",
"_hooks",
"symbol_table",
]
def __init__(
self,
*,
module: Optional[Module] = None,
context: Optional[Context] = None,
config_check: bool = True,
py_attr_tracker: Optional["RefTracker"] = None,
hooks: Optional[FxImporterHooks] = None,
):
if module is not None:
assert context is None, "If configuring with a Module, context must be None"
self._m = module
self._c = self.module.context
else:
self._c = context if context else Context()
self._m = Module.create(Location.unknown(self._c))
if config_check:
# Production code can disable this for a bit of a boost.
self._config_check()
self._py_attr_tracker = py_attr_tracker or RefTracker()
self._cc = ContextCache(self._c, py_attr_tracker=self._py_attr_tracker)
self._m_ip = InsertionPoint(self._m.body)
self._hooks = hooks or FxImporterHooks()
self.symbol_table = SymbolTable(self._m.operation)
self._hooks.prepare_module(self._m.operation)
def _config_check(self):
for dname in REQUIRED_DIALCTS:
try:
self._c.dialects[dname]
logging.debug("Context has registered dialect '%s'", dname)
except IndexError:
raise RuntimeError(
f"The MLIR context {self._c} is missing required dialect '{dname}'"
)
@property
def module(self) -> Module:
return self._m
@property
def module_op(self) -> Operation:
return self._m.operation
def import_program(
self,
prog: torch.export.ExportedProgram,
*,
func_name: str = "main",
func_visibility: Optional[str] = None,
) -> Operation:
"""Imports an ExportedProgram according to our chosen canonical representation.
This mechanism is the fully general solution for handling an ExportedProgram
and should eventually supercede all others. However, it depends on the
PyTorch 2.3 release to function properly (specifically, this patch
made ExportedProgram minimally correct for mutation:
https://github.com/pytorch/pytorch/pull/118969).
For stateless programs, the result of this import is a normal function
defined for immutable `!torch.vtensors`.
However, if the program mutates its inputs or buffers, then it will be imported
with those parameters as `!torch.tensor` and appropriate copies and overwrites
will be done on the inside. Note that the function is still mostly stateless,
but with `torch.copy.to_vtensor` and `torch.overwrite.tensor.contents`
ops at the earliest consumer or latest producer to update an argument or
buffer.
It is recommended that integrators subclass and override the `resolve_literal`
method to control access to mutable buffers and parameters. Without that, the
default policy is to capture them as frozen values.
"""
# Create lookaside table of placeholders/outputs.
placeholder_nodes: Dict[str, Node] = {}
all_producer_nodes: Dict[str, Node] = {}
loc: Optional[Location] = None
for node in prog.graph.nodes:
if loc is None:
loc = self._cc.get_node_location(node)
if node.op == "placeholder":
placeholder_nodes[node.name] = node
all_producer_nodes[node.name] = node
elif node.op == "call_function":
all_producer_nodes[node.name] = node
if loc is None:
loc = Location.unknown(self._c)
# This API is fast evolving. We keep these imports local for now so that we
# can disable this entire function if needed.
from torch.export.graph_signature import (
InputKind,
OutputKind,
TensorArgument,
SymIntArgument,
)
sig = prog.graph_signature
# Invert the (producer, node_name) maps for mutated user inputs and mutated
# buffers. This is because we hit-detect based on the input node name.
mutated_user_inputs = {
node_name: producer
for producer, node_name in sig.user_inputs_to_mutate.items()
}
# Additional bindings that we need to set up after the function is created.
mutable_buffer_target_producers: Dict[str, str] = {}
constant_tensors: Dict[Node, torch.Tensor] = {}
parameter_bindings: Dict[Node, Tuple[Any, InputInfo]] = {}
buffer_bindings: Dict[Node, Tuple[Any, InputInfo]] = {}
# Derive user outputs that we preserve. These will be nodes of the
# producer for the output.
user_outputs: List[Node] = []
user_output_types: List[IrType] = []
for output_spec in sig.output_specs:
kind = output_spec.kind
arg = output_spec.arg
if kind == OutputKind.USER_OUTPUT:
if not isinstance(arg, (TensorArgument, SymIntArgument)):
raise NotImplementedError(
f"OutputKind.USER_OUTPUT for {type(arg)}: {arg}"
)
output_producer_node = all_producer_nodes[arg.name]
user_outputs.append(output_producer_node)
user_output_types.append(
self._cc.node_val_to_type(output_producer_node)
)
elif kind == OutputKind.BUFFER_MUTATION and isinstance(arg, TensorArgument):
mutable_buffer_target_producers[output_spec.target] = arg.name
# Derive user inputs. These will be op=='placeholder' nodes.
user_inputs: List[Node] = []
user_input_types: List[IrType] = []
for input_spec in sig.input_specs:
arg = input_spec.arg
if input_spec.kind == InputKind.USER_INPUT:
# Set up user input.
if not isinstance(arg, (TensorArgument, SymIntArgument)):
raise NotImplementedError(
f"InputKind.USER_INPUT for {type(arg)}: {arg}"
)
placeholder_node = placeholder_nodes[arg.name]
mutable = placeholder_node.name in mutated_user_inputs
user_inputs.append(placeholder_node)
user_input_types.append(
self._cc.node_val_to_type(placeholder_node, mutable=mutable)
)
elif input_spec.kind == InputKind.CONSTANT_TENSOR and isinstance(
arg, TensorArgument
):
# Remember constant tensor binding.
constant_tensors[placeholder_nodes[arg.name]] = prog.constants[
input_spec.target
]
elif input_spec.kind == InputKind.PARAMETER and isinstance(
arg, TensorArgument
):
# Remember parameter binding.
value = prog.state_dict.get(input_spec.target)
assert (
not input_spec.persistent or value is not None
), "Expected state_dict value for persistent value"
node = placeholder_nodes[arg.name]
node_ir_type = self._cc.node_val_to_type(node, mutable=False)
parameter_bindings[node] = (
value,
InputInfo(
prog,
input_spec,
node=node,
ir_type=node_ir_type,
mutable_producer_node_name=None,
),
)
elif input_spec.kind == InputKind.BUFFER and isinstance(
arg, TensorArgument
):
# Remember buffer binding. Unlike user input mutations, buffers
# are assumed to be represented with load/store semantics based
# on a symbolic or other non-SSA association. As such, they
# are not modeled with mutable IR but will trigger an output
# store hook when the final value is produced.
value = prog.state_dict.get(input_spec.target)
assert (
not input_spec.persistent or value is not None
), "Expected state_dict value for persistent value"
node = placeholder_nodes[arg.name]
mutable_producer_node_name = mutable_buffer_target_producers.get(
input_spec.target
)
node_ir_type = self._cc.node_val_to_type(node, mutable=False)
buffer_bindings[node] = (
value,
InputInfo(
prog,
input_spec,
node=node,
ir_type=node_ir_type,
store_producer_node=mutable_producer_node_name,
),
)
else:
raise NotImplementedError(
f"InputSpec not of a known kind: {input_spec}"
)
ftype = FunctionType.get(user_input_types, user_output_types, context=self._c)
# Create the function.
with loc:
func_op = func_dialect.FuncOp(
func_name, ftype, ip=self._m_ip, visibility=func_visibility
)
# Programs imported from FX have strong guarantees. Setting this attribute
# causes various lowerings to be able to emit more efficient code or
# handle more cases. See isAssumingStrictSymbolicShapes().
func_op.attributes["torch.assume_strict_symbolic_shapes"] = UnitAttr.get()
entry_block = Block.create_at_start(func_op.body, ftype.inputs)
node_importer = GraphNodeImporter(
self,
self._c,
self._cc,
entry_block,
)
# Bind constants to IR values.
for constant_node, constant_tensor in constant_tensors.items():
node_importer.import_constant(loc, constant_node, constant_tensor)
# Bind user inputs to IR values.
for user_input_node, block_arg_value in zip(user_inputs, entry_block.arguments):
if user_input_node.name in mutated_user_inputs:
# Materialize
node_importer.import_mutable_to_vtensor(
loc,
user_input_node,
block_arg_value,
mutated_user_inputs[user_input_node.name],
)
else:
# Normal value tensor binding.
node_importer.bind_node_value(user_input_node, block_arg_value)
# Lazy bind buffer and parameter inputs.
for node, (parameter_value, info) in parameter_bindings.items():
node_importer.lazy_import_parameter(loc, node, parameter_value, info)
for node, (buffer_value, info) in buffer_bindings.items():
node_importer.lazy_import_buffer(loc, node, buffer_value, info)
# Import all nodes and return.
node_importer.import_nodes(
all_producer_nodes.values(), skip_placeholders_outputs=True
)
node_importer.return_node_values(loc, user_outputs)
self.symbol_table.insert(func_op)
return func_op
def import_frozen_program(
self,
prog: torch.export.ExportedProgram,
*,
func_name: str = "main",
func_visibility: Optional[str] = None,
) -> Operation:
"""Imports a consolidated torch.export.ExportedProgram instance.
If using the new torch.export path (vs a lower level precursor), then this is
the recommended way to canonically use this importer.
The ExportedProgram form differs from some of the earlier work primarily in
how it deals with references to external tensors from "outside". In this form,
all such references are checked to have originated from within the exported
scope or from an @assume_constant_result wrapped function. Then they are
transformed to graph inputs and stashed in one of two data structures on
the ExportedProgram:
inputs_to_buffers / buffers : For non-parameter buffers.
inputs_to_parameters / parameters : For parameter buffers.
The values of the mapping in inputs_to_{buffers|parameters} are in the
state_dict. This replaces get_attr nodes that would have classically been
present during lower level tracing.
Historically, torch-mlir has assumed that all such external accesses are
frozen, and this entry-point preserves this behavior, treating each distinct
torch.Tensor encountered in such a way as a `torch.vtensor.literal` (or
delegating to the literal_resolver_callback to make a policy decision).
As we anticipate more nuanced treatment options in the future, we name this
method to indicate that it is producing "frozen" modules. Additional top-level
approaches to handling state can be introduced later as an addition.
TODO: This mechanism should be eventually replaced by `import_program` with
hooks set on the subclass to freeze parameters and buffers. However, that is
waiting for the Torch 2.3 release cut.
"""
sig = prog.graph_signature
state_dict = prog.state_dict
arg_replacements: Dict[str, Any] = {}
# If there is no "constants" attribute, consult the "state_dict". Otherwise, only look
# at "constants". Relevant upstream patch: https://github.com/pytorch/pytorch/pull/118969
if hasattr(prog, "constants"):
constants = prog.constants
# Lift tensor constants.
for input_name, state_name in sig.inputs_to_lifted_tensor_constants.items():
try:
state_value = constants[state_name]
except KeyError as e:
raise AssertionError(
"Could not find state mapping for tensor constants"
) from e
arg_replacements[input_name] = state_value
else:
# Lift buffers.
for input_name, state_name in sig.inputs_to_buffers.items():
try:
state_value = state_dict[state_name]
except KeyError as e:
raise AssertionError(
"Could not find state mapping for buffer"
) from e
arg_replacements[input_name] = state_value
# Lift parameters.
for input_name, state_name in sig.inputs_to_parameters.items():
try:
state_value = state_dict[state_name]
except KeyError as e:
raise AssertionError(
"Could not find state mapping for parameter"
) from e
arg_replacements[input_name] = state_value
# Remove any lifted placeholders, replacing their uses with the state
# replacement value.
g = prog.graph
for node in g.nodes:
if node.op == "placeholder":
replacement = arg_replacements.get(node.name)
if replacement is None:
continue
node.replace_all_uses_with(replacement)
g.erase_node(node)
return self.import_stateless_graph(
g, func_name=func_name, func_visibility=func_visibility
)
def import_graph_module(self, gm: GraphModule) -> Operation:
"""Low-level import of a GraphModule assuming that it has been functionalized.
TODO: This mechanism is deprecated by the `import_program` entry-point and
it should be removed when no longer required for backwards compatibility.
"""
return self.import_stateless_graph(gm.graph)
def import_stateless_graph(
self,
g: Graph,
*,
func_name: str = "main",
func_visibility: Optional[str] = None,
) -> Operation:
"""Low-level import of a functionalized, assumed stateless Graph as a func.
TODO: This mechanism is deprecated by the `import_program` entry-point and
it should be removed when no longer required for backwards compatibility.
"""
ftype, loc = self._graph_to_function_meta(g)
# TODO: The FuncOp constructor requires a context-manager context.
# Fix upstream and then unnest.
# See: https://github.com/nod-ai/SHARK-Turbine/issues/138
with loc:
func = func_dialect.FuncOp(
func_name,
ftype,
ip=self._m_ip,
visibility=func_visibility,
)
entry_block = Block.create_at_start(func.body, ftype.inputs)
node_importer = GraphNodeImporter(
self,
self._c,
self._cc,
entry_block,
)
node_importer.import_nodes(g.nodes)
self.symbol_table.insert(func)
return func
def _graph_to_function_meta(self, g: Graph) -> Tuple[FunctionType, Location]:
"""Extracts function metadata from the Graph.
Principally, this includes the FunctionType, but in the future,
it should also return other annotations (input strides, etc) that
affect compilation and should be included as arg attrs.
"""
input_types = []
result_types = []
loc = None
for node in g.nodes:
# Assume that the first node we can get a location for is about as
# good as it gets as an overall function location.
if loc is None:
loc = self._cc.get_node_location(node)
if node.op == "placeholder":
input_types.append(self._cc.node_val_to_type(node))
elif node.op == "output":
# An output node's args[0] is the return value. This seems to
# always be "boxed" as a tuple, which we emit as multi-results.
for result_node in node.args[0]:
if result_node is None:
result_types.append(
IrType.parse("!torch.none", context=self._c)
)
elif isinstance(result_node, torch.Tensor):
result_types.append(
self._cc.tensor_to_vtensor_type(result_node)
)
else:
result_types.append(self._cc.node_val_to_type(result_node))
return (
FunctionType.get(input_types, result_types, context=self._c),
loc if loc else Location.unknown(self._c),
)
class ContextCache:
"""Caches per-context lookups of various things that we ask for repeatedly."""
__slots__ = [
"_c",
"_dtype_to_type",
"_tensor_metadata_cache",
"_py_attr_tracker",
# Types.
"torch_bool_type",
"torch_float_type",
"torch_int_type",
"torch_none_type",
"torch_str_type",
"torch_device_type",
]
def __init__(
self, context: Context, *, py_attr_tracker: Optional["RefTracker"] = None
):
self._c = context
self._dtype_to_type: Dict[TorchDtype, IrType] = {}
self._tensor_metadata_cache: Dict[
Tuple[torch.Size, torch.dtype, Optional[SparsityMeta], bool], IrType
] = {}
self._py_attr_tracker = py_attr_tracker or RefTracker()
# Common types.
with context:
self.torch_bool_type = IrType.parse("!torch.bool")
self.torch_float_type = IrType.parse("!torch.float")
self.torch_int_type = IrType.parse("!torch.int")
self.torch_none_type = IrType.parse("!torch.none")
self.torch_str_type = IrType.parse("!torch.str")
self.torch_device_type = IrType.parse("!torch.Device")
def integer_attr(self, value: int, bits: int) -> Attribute:
c = self._c
return IntegerAttr.get(IntegerType.get_signless(bits, c), value)
def format_asm_shape(self, shape: torch.Size) -> str:
"""Strips symbolic elements from a torch.Size object and returns shape asm"""
return ",".join("?" if is_symbolic(d) else str(d) for d in list(shape))
def get_vtensor_type(
self,
shape: torch.Size,
dtype: torch.dtype,
*,
sparsity: Optional[SparsityMeta] = None,
mutable: bool = False,
):
"""Return IrType for !torch.vtensor with the given shape and dtype"""
stem = "torch.tensor" if mutable else "torch.vtensor"
shape_asm = self.format_asm_shape(shape)
mlir_dtype = str(self.dtype_to_type(dtype))
if sparsity is not None:
encoding = sparsity_encoding(shape, sparsity)
assert encoding is not None
return IrType.parse(
f"!{stem}<[{shape_asm}],{str(mlir_dtype)},{encoding}>",
context=self._c,
)
return IrType.parse(
f"!{stem}<[{shape_asm}],{str(mlir_dtype)}>", context=self._c
)
def node_val_to_type(self, node: torch_fx.Node, *, mutable: bool = False) -> IrType:
try:
tensor_meta = node.meta.get("tensor_meta")
val = node.meta.get("val")
sparsity = node.meta.get("sparsity", None)
except KeyError as e:
raise RuntimeError(
f"FIXME: Illegal access to torch.fx.Node.meta: {e} ({node.meta.keys()} : {node.meta})"
)
return self.value_info_to_type(
val, tensor_meta=tensor_meta, sparsity=sparsity, mutable=mutable
)
def value_info_to_type(
self,
val,
*,
tensor_meta: Optional[TensorMetadata] = None,
sparsity=None,
mutable: bool = False,
):
if tensor_meta is not None:
assert isinstance(tensor_meta, TensorMetadata)
# Quantized tensor meta data is not preserved in our lowering,
# so throw error instead of silently doing wrong thing.
if tensor_meta.is_quantized:
raise NotImplementedError(
f"Quantized tensor meta data is not supported."
)
else:
return self.tensor_metadata_to_type(
tensor_meta, sparsity=sparsity, mutable=mutable
)
elif val is not None:
# some nodes with symbolic inputs pass a 'val' attribute rather than
# tensor_meta
if isinstance(val, TorchFakeTensor):
return self.get_vtensor_type(
val.size(), val.dtype, sparsity=sparsity, mutable=mutable
)
# Note that None is a valid scalar here, so it is important that this
# is always checked as the last fallback.
t = SCALAR_TYPE_TO_TORCH_MLIR_TYPE.get(type(val))
if t is not None:
return IrType.parse(t, self._c)
raise NotImplementedError(
f"Could not deduce type from value info: "
f"tensor_meta={tensor_meta}, val={val} {type(val)}, sparsity={sparsity}"
)
def tensor_metadata_to_type(
self,
tm: TensorMetadata,
*,
sparsity: Optional[SparsityMeta] = None,
mutable: bool = False,
) -> IrType:
tm_shape = tuple(
item.node if is_symbolic(item) else item for item in list(tm.shape)
)
key = (tm_shape, tm.dtype, sparsity, mutable)
t = self._tensor_metadata_cache.get(key)
if t is None:
t = self.get_vtensor_type(
tm.shape, tm.dtype, sparsity=sparsity, mutable=mutable
)
self._tensor_metadata_cache[key] = t
return t
def dtype_to_type(self, dtype: TorchDtype) -> IrType:
t = self._dtype_to_type.get(dtype)
if t is None:
try:
asm = TORCH_DTYPE_TO_MLIR_TYPE_ASM[dtype]
except IndexError:
raise ValueError(f"Unknown conversion from {dtype} to IREE type")
t = IrType.parse(asm, self._c)
self._dtype_to_type[dtype] = t
return t
def create_vtensor_type(self, dtype: torch.dtype, size: torch.Size) -> IrType:
dtype_asm = str(self.dtype_to_type(dtype))
return IrType.parse(
f"!torch.vtensor<{list(size)},{dtype_asm}>", context=self._c
)
def tensor_to_vtensor_type(self, tensor: torch.Tensor) -> IrType:
return self.create_vtensor_type(tensor.dtype, tensor.size())
def get_node_location(self, node: torch_fx.Node) -> Optional[Location]:
stack_trace = node.meta.get("stack_trace")
if stack_trace is None:
return None
# Ugh.
# TODO: Avoid needing to regex match this.
# https://github.com/pytorch/pytorch/issues/91000
stack_trace = node.stack_trace
if stack_trace:
m = re.search(r"""File "([^"]+)", line ([0-9]+),""", stack_trace)
if m:
filename, line = m.group(1), int(m.group(2))
return Location.file(filename, line, col=0, context=self._c)
return Location.unknown(context=self._c)
class GraphNodeImporter:
"""Imports graph nodes into an MLIR function.
The caller must have already created the function.
"""
__slots__ = [
"_b",
"_c",
"_cc",
"_on_node_produced",
"_v",
"_multi_result_nodes",
"fx_importer",
]
def __init__(
self,
fx_importer: FxImporter,
context: Context,
context_cache: ContextCache,
block: Block,
):
self.fx_importer = fx_importer
self._c = context
self._cc = context_cache
self._b = block
# Map of (Node, result_index) to MLIR Value or a callback that lazily
# constructs and returns a value.
self._v: Dict[Union[Callable[[], Value], Tuple[torch_fx.Node, int]], Value] = {}
# Map of node name to hook that should be called when it is produced.
self._on_node_produced: Dict[str, Callable[[Value], None]] = {}
# Statically multi-result nodes which we have de-tupled are noted here.
# They will have their getitem calls short-circuited.
self._multi_result_nodes: Set[torch_fx.Node] = set()
def bind_node_value(
self,
node: Node,
value: Union[Value, Callable[[], Value]],
result_index: int = 0,
):
"""Binds a node to a value (and asserts if already bound).
This is used by outside callers. Many internal callers poke directly
into the dict.
"""
key = (node, result_index)
assert key not in self._v, f"Node already has a value: {node}"
self._v[key] = value
producer_callback = self._on_node_produced.get(node.name)
if producer_callback is not None:
producer_callback(value)
def resolve_node_value(self, node: Node, result_index: int = 0) -> Value:
"""Resolves a node to a value."""
key = (node, result_index)
try:
binding = self._v[key]
except KeyError:
raise KeyError(f"FX Node {node} has not been bound to an MLIR value")
if isinstance(binding, Value):
return binding
# It is a lazy callback.
value = binding()
self._v[key] = value
return value
def import_mutable_to_vtensor(
self, loc: Location, node: Node, mutable_value: Value, producer_node_name: str
) -> Value:
"""Imports a node that is represented by a mutable IR value.
This will generate and associate the following with the node:
%0 = torch.copy.to_vtensor {mutable_value}
Then it will also add a trigger such that when `producer_node_name` is
produced, the following will be generated:
torch.overwrite.tensor.contents {producer}, {mutable_value}
"""
with loc, InsertionPoint(self._b):
immutable_type = self._cc.node_val_to_type(node)
copy_result = Operation.create(
"torch.copy.to_vtensor",
results=[immutable_type],
operands=[mutable_value],
).result
self.bind_node_value(node, copy_result)
# Add the producer trigger.
def on_produced(value: Value):
with loc, InsertionPoint(self._b):
Operation.create(
"torch.overwrite.tensor.contents",
results=[],
operands=[value, mutable_value],
)
self._on_node_produced[producer_node_name] = on_produced
return copy_result
def import_constant(self, loc: Location, node: Node, constant: Any) -> Value:
with loc, InsertionPoint(self._b):
value = self._import_literal(constant)
self.bind_node_value(node, value)
return value
def lazy_import_parameter(
self, loc, node: Node, parameter_value: Any, info: InputInfo
):
def _on_access() -> Value:
with loc, InsertionPoint(self._b):
# TODO: Should go to a parameter binding hook.
return self._import_input(parameter_value, info)
self.bind_node_value(node, _on_access)
def lazy_import_buffer(
self,
loc,
node: Node,
buffer_value: Any,
info: InputInfo,
):
def _on_access() -> Value:
with loc, InsertionPoint(self._b):
# TODO: Should go to a buffer binding hook.
return self._import_input(buffer_value, info)
self.bind_node_value(node, _on_access)
if info.mutable_producer_node_name is not None:
raise NotImplementedError("NYI: Mutable SSA buffer updates")
if info.store_producer_node is not None:
def on_produced(value: Value):
with loc, InsertionPoint(self._b):
self.fx_importer._hooks.store_produced_value(
self, buffer_value, value, info
)
self._on_node_produced[info.store_producer_node] = on_produced
def return_node_values(self, loc, nodes: List[Node]):
with loc, InsertionPoint(self._b):
operands = [self.resolve_node_value(n) for n in nodes]
func_dialect.ReturnOp(operands, loc=loc)
def import_nodes(
self, nodes: Iterable[Node], *, skip_placeholders_outputs: bool = False
):
with InsertionPoint(self._b):
loc = Location.unknown()
num_placeholders = 0
for node in nodes:
op = node.op
# Attempt to extract locations. Not everything has them,
# so we do our best.
new_loc = self._cc.get_node_location(node)
if new_loc is not None:
loc = new_loc
if op == "placeholder" and not skip_placeholders_outputs:
# Associate the placeholder node with corresponding block
# argument.
self.bind_node_value(node, self._b.arguments[num_placeholders])
num_placeholders += 1
elif op == "call_function":
target = node.target
if target == operator.getitem:
# Special case handling of getitem for when it is resolving
# against a function call that we know has returned multiple
# results. We short-circuit this case because we have modeled
# function calls to natively return multiple results vs tupling.
getitem_ref, getitem_index = node.args
if getitem_ref in self._multi_result_nodes:
try:
self.bind_node_value(
node,
self.resolve_node_value(getitem_ref, getitem_index),
)
except IndexError:
raise RuntimeError(
f"getitem de-aliasing failed. This likely "
f"indicates a programmer error that usually "
f"would have happened at runtime. Please "
f"notify developers if this case happens "
f"(at {loc})."
)
else:
raise NotImplementedError(
f"General getitem access to non-multi-result ops"
)
elif target in SYMBOLIC_TORCH_OPS or (
is_symbolic(node.meta.get("val"))
and is_builtin_function_or_method(target)
):
self._import_symbolic_torch_op(loc, node, target)
elif isinstance(target, TorchOpOverload):
# Dispatch to an ATen op.
self._import_torch_op_overload(loc, node, target)
elif isinstance(target, HigherOrderOperator):
self._import_hop(loc, node, target)
else:
raise NotImplementedError(
f"FIX ME: Unimplemented call_function: target={node.target}, {node.meta}"
)
elif op == "output" and not skip_placeholders_outputs:
# args[0] is a singleton tuple that we flatten into multiple
# results.
operands = [self._import_argument(loc, arg) for arg in node.args[0]]
func_dialect.ReturnOp(operands, loc=loc)
def _promote_symbolic_scalar_int_float(self, loc, graph, param):
temp_target = torch.ops.aten.Float.Scalar
temp_node = Node(
graph=graph,
name=f"{str(param)}_as_float",
op="call_function",
target=temp_target,
args=(param,),
kwargs={},
return_type=float,
)
temp_node.meta["val"] = torch.sym_float(param.meta["val"])
self._import_torch_op_overload(loc, temp_node, temp_target)
return temp_node
def _import_symbolic_torch_op(
self,
loc: Location,
node: torch_fx.Node,
target: Union[
torch._ops.OpOverloadPacket, BuiltinMethodType, BuiltinFunctionType
],
):
# parse builtin operations like add, sub, mul, etc. because dynamo captures these
# operations on symbolic arguments as regular python expressions rather than as torch ops
if is_builtin_function_or_method(target):
arg_types = [
(arg.meta["val"].node.pytype if isinstance(arg, Node) else type(arg))
for arg in node.args
]
is_int = [item is int for item in arg_types]
if all(is_int):
op_overload = "int"
elif any(is_int):
if target.__name__ in ("add", "lt", "ge", "ne", "gt"):
op_overload = "float_int"
# put float arg first, as expected in signature
if arg_types[1] == float:
node.args = (node.args[1], node.args[0])
else:
# promote int argument to float - following torch-mlir convention
arg0, arg1 = node.args
if is_int[0]:
if isinstance(arg0, Node):
prom_arg = self._promote_symbolic_scalar_int_float(
loc, node.graph, arg0
)
new_args = (prom_arg, arg1)
else:
arg0 = float(arg0)
new_args = (arg0, arg1)
else:
if isinstance(arg1, Node):
prom_arg = self._promote_symbolic_scalar_int_float(
loc, node.graph, arg1
)
new_args = (arg0, prom_arg)
else:
arg1 = float(arg1)
new_args = (arg0, arg1)
node.args = new_args
op_overload = "float"
else:
op_overload = "float"
torch_op = PY_BUILTIN_TO_TORCH_OP.get(target.__name__)
assert (
torch_op is not None
), f"Unsupported builtin function for symbolic types: {target} with args {node.args}"
concrete_target = getattr(torch_op, op_overload)
else:
if _IS_TORCH_2_1_OR_EARLIER:
concrete_target = SYMBOLIC_OP_TO_TORCH_OP.get((target, len(node.args)))
else:
concrete_target = SYMBOLIC_OP_TO_TORCH_OP.get(target)
assert (
concrete_target is not None
), f"Unable to parse symbolic operation: {target} with args {node.args}"
self._import_torch_op_overload(loc, node, concrete_target)
def _import_hop(self, loc: Location, node: torch_fx.Node, hop: HigherOrderOperator):
# Imports a higher-order operator.
# See: https://dev-discuss.pytorch.org/t/higher-order-operators-2023-10/1565
assert hop.namespace == "higher_order"
hop_name = hop.name()
handler_name = f"_import_hop_{hop_name}"
handler = getattr(self, handler_name, None)
if handler is None:
raise NotImplementedError(
f"Higher-order operation '{hop_name}' not "
f"implemented in the FxImporter "
f"(tried '{handler_name}')"
)
handler(loc, node, hop)
def _import_hop_auto_functionalized(
self, loc: Location, node: torch_fx.Node, hop: HigherOrderOperator
):
# Imports the torch._higher_order_ops.auto_functionalize.auto_functionalized HOP.
# This op wraps a target OpOverload with args/kwargs dispatched to it.
# Even thought the OpOverload will return None, this returns the
# arguments mutated. Note that the general op overload importing can't
# be used here as they use a special encoding for everything.
# See: torch/_higher_order_ops/auto_functionalize.py
(op_overload,) = node.args
schema = op_overload._schema
assert isinstance(schema, FunctionSchema)
mlir_op_name = _get_mlir_op_name_for_schema(schema)
# Functionalization transforms the results to (*actual, *aliased).
# If the schema is actually zero return, then the first "val"
# type will be None and we need to bind that as a result of the node.
# However, that doesn't make it into the IR. This special casing is
# annoying.
node_result_types = [
(None if v is None else self._cc.tensor_metadata_to_type(v))
for v in node.meta["val"]
]
if len(schema.returns) == 0:
assert node_result_types[0] is None
ir_result_types = node_result_types[1:]
bind_none = 1
else:
ir_result_types = node_result_types
bind_none = 0
# The auto_functionalized ops maps all arguments by name (as opposed
# to mixed for generic OpOverload). Linearize them.
operands = []
for parameter in schema.arguments:
operand = self._import_argument(
loc, node.kwargs[parameter.name], parameter.type
)
operands.append(operand)
operation = _emit_operation(
mlir_op_name,
result_types=ir_result_types,
operands=operands,
loc=loc,
)
# Special case: if declared_result_types was empty, then we bind a
# None for future node access.
self._multi_result_nodes.add(node)
if bind_none:
self.bind_node_value(node, None, 0)
# Record value mappings for remainder.
for i, value in enumerate(operation.results):
self.bind_node_value(node, value, i + bind_none)
def _import_torch_op_overload(
self, loc: Location, node: torch_fx.Node, target: TorchOpOverload
):
# TODO: Convert this cascade of ifs to a table-driven
# replace lift_fresh_copy with clone op
if target == torch.ops.aten.lift_fresh_copy.default:
node.target = target = torch.ops.aten.clone.default
node.args = (node.args[0],)
node.kwargs = {"memory_format": None}
elif target == torch.ops.aten.lift_fresh_copy.out:
# TODO: It seems not possible to hit this case from user code.
# Retaining in case if it is triggered internally somehow, but
# it can most likely be removed once assuming full
# functionalization in all cases.
node.target = target = torch.ops.aten.clone.out
node.args = (node.args[0],)
node.kwargs = {"memory_format": None, "out": node.args[1]}
# TODO: generalize empty.memory_format in the future
# Currently, the aten.baddbmm.default op for Unet includes multiplying an
# empty.memory_format input with a constant, which creates NaN values
# because empty.memory_format contains uninitialized data. Converting
# aten.baddbmm.default -> aten.zeros.default fixes the correctness issue
elif target == torch.ops.aten.empty.memory_format:
if len(node.users) == 1:
for key_node in node.users:
if key_node.target == torch.ops.aten.baddbmm.default:
node.target = target = torch.ops.aten.zeros.default
elif target == torch.ops.aten._local_scalar_dense.default:
input_type = node.args[0].meta["tensor_meta"].dtype
if input_type.is_floating_point:
node.target = target = torch.ops.aten.Float.Tensor
else:
node.target = target = torch.ops.aten.Int.Tensor
node.args = (node.args[0],)
elif target == torch.ops.aten._assert_async.msg:
# TODO: A more suitable op to replace it?
return
elif target == torch.ops.aten._unsafe_index_put.default:
node.target = target = torch.ops.aten._unsafe_index_put.hacked_twin
schema = target._schema
assert isinstance(schema, FunctionSchema)
mlir_op_name = _get_mlir_op_name_for_schema(schema)
# Intervening to use Scalar ops due to incorrect ops from AOT-autograd with scalar arguments.
if mlir_op_name in TENSOR_SCALAR_OP_CONVERTER and (
isinstance(node.args[1], float) or isinstance(node.args[1], int)
):
mlir_op_name = TENSOR_SCALAR_OP_CONVERTER[mlir_op_name]
# we are dynamically changing which op is emitted here due to an issue in
# torch dynamo where it emits the Tensor variant of ops even when processing
# scalar arguments, therefore we retrieve the schema as well so that we
# consume the correct typing information when subsequently importing the
# function arguments and result types
# i.e. the code below is basically doing `schema = torch.ops.aten.my_op.Scalar._schema`
op_attrs = mlir_op_name.split(".")
op_overload = getattr(torch, "ops")
for i in range(1, len(op_attrs)):
op_overload = getattr(op_overload, op_attrs[i])
schema = op_overload._schema
# Convert result types.
result_types = self._unpack_node_result_types(node, schema)
if len(result_types) > 1:
self._multi_result_nodes.add(node)
# Unroll operands from formal parameters, args and kwargs.
operands = []
for i, parameter in enumerate(schema.arguments):
if i < len(node.args):
operands.append(
self._import_argument(loc, node.args[i], parameter.type)
)
elif parameter.name in node.kwargs:
operands.append(
self._import_argument(
loc, node.kwargs[parameter.name], parameter.type
)
)
else:
operands.append(
self._import_default_value(
loc, parameter.default_value, parameter.type
)
)
operation = _emit_operation(
mlir_op_name, result_types=result_types, operands=operands, loc=loc
)
# Record value mapping.
for i, value in enumerate(operation.results):
self.bind_node_value(node, value, i)
def _import_argument(
self, loc: Location, arg: NodeArgument, expected_jit_type=None
) -> Value:
"""Import an FX `Argument`, which must result to an MLIR `Value`."""
if isinstance(arg, torch_fx.Node):
# If implementing boxed support for multi-result nodes, then
# this will need to do something more intelligent.
if arg in self._multi_result_nodes:
raise RuntimeError(f"Attempt to de-reference a multi-result node")
# catch references to dynamically created constant attributes and make sure they have an origin in our module
if arg.op == "get_attr" and (arg.target, 0) not in self._v:
gm = arg.graph.owning_module
assert hasattr(
gm, arg.target
), f"Attempting to retrieve attribute '{arg.target}' from module, but no such attribute exists"
obj = getattr(gm, arg.target)
with loc:
self.bind_node_value(arg, self._import_literal(obj))
argument_value = self.resolve_node_value(arg)
elif isinstance(arg, torch_fx.immutable_collections.immutable_list):
argument_value = self._import_list_argument(loc, arg, expected_jit_type)
elif isinstance(expected_jit_type, torch.TensorType) and not isinstance(
arg, torch.Tensor
):
# promote scalars to tensor types as appropriate
argument_value = self._import_scalar_as_tensor(loc, arg)
elif LITERAL_CONVERTER_MAP.lookup(type(arg)) is not None:
with loc:
argument_value = self._import_literal(arg)
else:
raise TypeError(f"Unsupported argument type {arg.__class__}")
with loc:
return self._convert_type(argument_value, expected_jit_type)
def _convert_type(
self,
val: Value,
expected_type,
dtype: Optional[torch.dtype] = None,
size: Optional[torch.Size] = None,
):
"""
When the type of 'value' and the type in the schema do not match,
attempt to perform automatic type conversion.
example: test/python/fx_importer/basic_test.py::test_full
"""
if not expected_type:
return val
op_name = None
result_type = None
# TODO: If additional types require conversion in the future,
# consider implementing a table-driven approach.
operands = [val]
if val.type == self._cc.torch_bool_type:
if isinstance(expected_type, torch.FloatType):
op_name = "torch.aten.Float.bool"
result_type = self._cc.torch_float_type
elif isinstance(expected_type, (torch.IntType, torch.NumberType)):
op_name = "torch.aten.Int.bool"
result_type = self._cc.torch_int_type
elif expected_type is torch.Tensor:
op_name = "torch.prims.convert_element_type"
result_type = self._cc.create_vtensor_type(dtype, size)
operands.append(
LITERAL_CONVERTER_MAP.lookup(torch.dtype)(dtype, self, self._cc)
)
if op_name is None:
return val
return Operation.create(
name=op_name, results=[result_type], operands=operands
).result
def _import_literal(self, py_value: Any) -> Value:
orig_value = None
if isinstance(py_value, torch.Tensor) and py_value.dtype == torch.bool:
orig_value = py_value
py_value = py_value.to(torch.uint8)
# Apply the conversion callback.
user_value = self.fx_importer._hooks.resolve_literal(self, py_value)
if user_value is not None:
assert isinstance(user_value, Value)
return user_value
# Default conversion path.
converter = LITERAL_CONVERTER_MAP.lookup(type(py_value))
if converter is None:
raise TypeError(
f"Unsupported argument -> literal conversion for {py_value.__class__}"
)
result = converter(py_value, self, self._cc)
if orig_value is not None:
result = self._convert_type(
result, torch.Tensor, orig_value.dtype, orig_value.size()
)
return result
def _import_input(self, py_value: Any, info: InputInfo) -> Value:
# Try the hook.
user_value = self.fx_importer._hooks.resolve_input(self, py_value, info)
if user_value is not None:
assert isinstance(user_value, Value)
return user_value
# Fall-back to treating as a literal if not mutating.
if info.mutable_producer_node_name is not None:
raise ValueError(
f"Cannot import {info.input_spec} as a literal because it is mutable"
)
return self._import_literal(py_value)
def _import_scalar_as_tensor(self, loc: Location, arg: NodeArgument) -> Value:
tensor_arg = torch.tensor(arg)
result_type = self._cc.get_vtensor_type(tensor_arg.size(), tensor_arg.dtype)
with loc:
constant_arg = LITERAL_CONVERTER_MAP.lookup(type(arg))(arg, self, self._cc)
return Operation.create(
name="torch.prim.NumToTensor.Scalar",
results=[result_type],
operands=[constant_arg],
loc=loc,
).result
def _import_list_argument(
self, loc: Location, arg: Sequence[NodeArgument], expected_jit_type
) -> Value:
assert (
isinstance(expected_jit_type, torch.ListType)
or (
isinstance(expected_jit_type, torch.OptionalType)
and isinstance(expected_jit_type.getElementType(), torch.ListType)
)
or (expected_jit_type is None)
), f"Unexpected jit type as list argument: {arg} of type {expected_jit_type}"
# parse list type
if expected_jit_type is None:
element_type = type(arg[0])
else:
element_jit_type = expected_jit_type.getElementType()
# this branch is needed to handle Optional[List[]] types
if isinstance(element_jit_type, torch.ListType):
element_jit_type = element_jit_type.getElementType()
# this handles getting the inner types for List[Optional[]] types
is_optional_type = isinstance(element_jit_type, torch.OptionalType)
if is_optional_type:
element_jit_type = element_jit_type.getElementType()
element_type = TORCH_TYPE_TO_PY_TYPE[type(element_jit_type)]
# create list operands
list_operands = []
for operand in arg:
operand_type = type(operand)
if isinstance(operand, Node):
if operand in self._multi_result_nodes:
raise RuntimeError(f"Attempt to de-reference a multi-result node")
val = self.resolve_node_value(operand)
val_type = str(val.type)
assert (
isinstance(element_type, str) and element_type in val_type
) or SCALAR_TYPE_TO_TORCH_MLIR_TYPE.get(
element_type
) == val_type, f"Heterogeneous lists are not supported: expected {element_type}, got {val_type}"
else:
assert (is_optional_type and operand_type is NoneType) or (
element_type == operand_type
), f"Heterogeneous lists are not supported: expected {element_type}, got {operand_type}"
operand_jit_type = (
torch.NoneType if operand_type is NoneType else element_jit_type
)
val = self._import_default_value(loc, operand, operand_jit_type)
list_operands.append(val)
# construct list op
if is_optional_type:
list_type = PY_TYPE_TO_TORCH_OPTIONAL_LIST_TYPE[element_type]
else:
list_type = PY_TYPE_TO_TORCH_LIST_TYPE[element_type]
result_type = IrType.parse(list_type, context=self._c)
operation = Operation.create(
"torch.prim.ListConstruct",
results=[result_type],
operands=list_operands,
loc=loc,
)
return operation.result
def _import_default_value(self, loc: Location, arg, expected_jit_type) -> Value:
"""Imports a defaulted value for a known function schema."""
if isinstance(arg, list):
return self._import_list_argument(loc, arg, expected_jit_type)
# The LITERAL_CONVERTER_MAP maps each arg to its respective constant
# of the expected jit IR type (types like torch.dtype will form a chain of
# maps to get to constant of expected_jit_type).
cvt = LITERAL_CONVERTER_MAP.lookup(type(arg))
if cvt is None:
raise RuntimeError(f"Unhandled default value ({arg.__class__}): {arg})")
with loc:
return cvt(arg, self, self._cc)
def _unpack_node_result_types(
self, node: torch.fx.Node, schema: FunctionSchema
) -> List[IrType]:
return_count = len(schema.returns)
if return_count == 1:
# Unary return directly maps a single meta["val"] and cannot be subscripted.
# if "tensor_meta" is None, this will throw unsupported placeholder node error
result_types = [self._cc.node_val_to_type(node)]
elif return_count == 0:
# Some torch ops do have 0 returns, and these are supported with ZeroResults
# op trait. Python bindings for IR creation allow us to pass empty result_types
# for such ops. Therefore, we pass an empty result types for these cases.
result_types = []
else:
# Multi-return will unpack the meta["val"] and trigger our getitem subscripting
# short-circuit above. Note that if we ever choose to also fully reify Python
# level result tuples, we will need to create a tuple-boxed version of this and
# redirect to it for generic object access.
result_types = []
for v in node.meta["val"]:
result_types.append(self._cc.value_info_to_type(v))
return result_types
def _make_constant_op(
op_name: str, value_attr: Attribute, result_type: Optional[IrType] = None
) -> Operation:
return Operation.create(
op_name,
results=[result_type if result_type else value_attr.type],
attributes={"value": value_attr},
)
def _create_mlir_tensor_type(dtype: torch.dtype, size: torch.Size) -> IrType:
try:
element_type = TORCH_DTYPE_TO_MLIR_TYPE[dtype]()
tensor_type = RankedTensorType.get(size, element_type)
return tensor_type
except KeyError:
raise TypeError(f"Could not map Torch dtype {dtype} to an MLIR type")
def create_mlir_tensor_type(tensor: torch.Tensor) -> IrType:
return _create_mlir_tensor_type(tensor.dtype, tensor.size())
def _make_vtensor_literal_op(
tensor: torch.Tensor, vtensor_type: IrType, py_attr_tracker: "RefTracker"
) -> Operation:
mapping = py_attr_tracker.track(tensor)
if mapping.is_empty:
# check support for bfloat16
assert not (
tensor.dtype == torch.bfloat16 and ml_dtypes is None
), f"torch.bfloat16 requires the ml_dtypes package, please run:\n\npip install ml_dtypes\n"
# Resolve the attribute.
npy_dtype = TORCH_DTYPE_TO_NPY_TYPE.get(tensor.dtype)
assert (
npy_dtype is not None
), f"Can not create literal tensor for unsupported datatype: {tensor.dtype}"
# We need a raw buffer of data in order to create an ElementsAttr for the invocation of torch.vtensor.literal,
# but torch.Tensor does not fulfill the python buffer/array interface hence we must convert to a numpy array to get
# a raw buffer of our data. We can't call torch.Tensor.numpy() directly because this internally forces a call to
# detach() which throws an error as we are operating in a FakeTensorMode, hence the simplest way to get this raw
# buffer is via the indirection: Tensor -> list -> numpy array. This allows us to create a vtensor literal as
# desired, but also limits which data types we can support in this function (see TORCH_DTYPE_TO_NPY_TYPE above)
np_tensor = np.array(tensor.tolist()).astype(npy_dtype)
# One element constants are more optimizable as splat DenseElementsAttr. DenseResourceElementsAttr does not
# support splats, so don't use it for that case. In addition, at the time of writing, it has bugs with handling
# 0d tensors.
if np_tensor.size == 1:
try:
dtype = tensor.dtype
element_type = TORCH_DTYPE_TO_MLIR_TYPE[dtype]()
except KeyError:
raise TypeError(f"Could not map Torch dtype {dtype} to an MLIR type")
elements_attr = DenseElementsAttr.get(
type=element_type, array=np_tensor, shape=np_tensor.shape
)
else:
bytes_view = np_tensor.view(npy_dtype)
tensor_type = create_mlir_tensor_type(tensor)
shape_desc = "_".join([str(d) for d in tensor.shape])
blob_name = f"torch_tensor_{shape_desc}_{str(tensor.dtype)}"
elements_attr = DenseResourceElementsAttr.get_from_buffer(
bytes_view,
blob_name,
tensor_type,
)
mapping.value = elements_attr
else:
elements_attr = mapping.value
return Operation.create(
name="torch.vtensor.literal",
results=[vtensor_type],
attributes={"value": elements_attr},
)
################################################################################
# TypeSubclassMapping
################################################################################
class TypeSubclassMap:
"""Mapping of super-types to values.
Maintains a cache of actual types seen and uses that instead of a linear
scan.
"""
__slots__ = [
"_cache",
"_mapping",
]
def __init__(self):
# The linear list of converters.
self._mapping: List[Tuple[type, Any]] = []
# When there is a hit on the linear mapping, memoize it here.
self._cache: Dict[type, Any] = {}
def map(self, t: type, value: Any):
self._mapping.append((t, value))
self._cache[t] = value
def lookup(self, t: type) -> Any:
try:
return self._cache[t]
except KeyError:
pass
for t_super, value in self._mapping:
if issubclass(t, t_super):
self._cache[t] = value
return value
else:
self._cache[t] = None
return None
###############################################################################
# Utilities
###############################################################################
def _get_mlir_op_name_for_schema(schema: FunctionSchema) -> str:
# Returns a fully-qualified MLIR operation name (i.e. 'torch.foobar')
# for a function schema.
namespace, sep, unqualified_name = schema.name.partition("::")
assert sep, f"Malformed Torch op name {schema.name}"
mlir_op_name = f"torch.{namespace}.{unqualified_name}"
if schema.overload_name != "":
mlir_op_name += f".{schema.overload_name}"
return mlir_op_name
def _emit_operation(
mlir_op_name: str, result_types: List[IrType], operands: List[Value], loc: Location
) -> Operation:
# Support unregistered torch ops using torch.operator.
# torch.operator is used to represent ops from registry
# which haven't been generated by torch_ods_gen.py.
context = loc.context
if not context.is_registered_operation(mlir_op_name):
operation = Operation.create(
"torch.operator",
attributes={"name": StringAttr.get(mlir_op_name)},
results=result_types,
operands=operands,
loc=loc,
)
else:
operation = Operation.create(
mlir_op_name,
results=result_types,
operands=operands,
loc=loc,
)
return operation
###############################################################################
# Reference mapping
###############################################################################
# Opaque value to indicate something is empty. Used in cases where 'None'
# may have a different meaning.
class EmptyType: ...
Empty = EmptyType()
class RefMapping:
__slots__ = [
"_referrent",
"value",
]
def __init__(self, referrent: Any):
if referrent is not Empty:
self._referrent = weakref.ref(referrent)
self.value = Empty
@property
def is_empty(self):
return self.value is Empty
def __repr__(self):
return (
f"<RefMapping {id(self._referrent) if self._referrent is not Empty else 'empty'} -> "
f"{self.value if self.value is not Empty else 'empty'}>"
)
class RefTracker:
"""Tracks live references from Python values to symbolic associations."""
def __init__(self):
self._refs: Dict[int, RefMapping] = {}
def track(self, referrent: Any) -> RefMapping:
ref_id = id(referrent)
existing = self._refs.get(ref_id)
if existing:
return existing
info = RefMapping(referrent)
if referrent is not Empty:
weakref.finalize(referrent, self._ref_finalizer, ref_id)
self._refs[ref_id] = info
return info
def _ref_finalizer(self, ref_id: int):
del self._refs[ref_id]
################################################################################
# Mappings
################################################################################
LITERAL_CONVERTER_MAP = TypeSubclassMap()
LITERAL_CONVERTER_MAP.map(
NoneType,
lambda arg, gni, cc: Operation.create(
"torch.constant.none", results=[cc.torch_none_type]
).result,
)
LITERAL_CONVERTER_MAP.map(
bool,
lambda arg, gni, cc: _make_constant_op(
"torch.constant.bool", cc.integer_attr(arg, 1), cc.torch_bool_type
).result,
)
LITERAL_CONVERTER_MAP.map(
int,
lambda arg, gni, cc: _make_constant_op(
"torch.constant.int", cc.integer_attr(arg, 64), cc.torch_int_type
).result,
)
LITERAL_CONVERTER_MAP.map(
float,
lambda arg, gni, cc: _make_constant_op(
"torch.constant.float", FloatAttr.get_f64(arg), cc.torch_float_type
).result,
)
LITERAL_CONVERTER_MAP.map(
str,
lambda arg, gni, cc: _make_constant_op(
"torch.constant.str", StringAttr.get(arg), cc.torch_str_type
).result,
)
LITERAL_CONVERTER_MAP.map(
torch.Tensor,
lambda arg, gni, cc: _make_vtensor_literal_op(
arg, cc.tensor_to_vtensor_type(arg), cc._py_attr_tracker
).result,
)
LITERAL_CONVERTER_MAP.map(
torch.device,
lambda arg, gni, cc: _make_constant_op(
"torch.constant.device", StringAttr.get(str(arg)), cc.torch_device_type
).result,
)
LITERAL_CONVERTER_MAP.map(
torch.dtype,
lambda arg, gni, cc: LITERAL_CONVERTER_MAP.lookup(int)(
TORCH_DTYPE_TO_INT[arg], gni, cc
),
)
LITERAL_CONVERTER_MAP.map(
torch.layout,
lambda arg, gni, cc: LITERAL_CONVERTER_MAP.lookup(int)(
TORCH_LAYOUT_TO_INT[arg], gni, cc
),
)
LITERAL_CONVERTER_MAP.map(
torch.memory_format,
lambda arg, gni, cc: LITERAL_CONVERTER_MAP.lookup(int)(
TORCH_MEMORY_FORMAT_TO_INT[arg], gni, cc
),
)
TORCH_TYPE_TO_PY_TYPE = {
torch.IntType: int,
torch.FloatType: float,
torch.StringType: str,
torch.BoolType: bool,
torch.TensorType: "vtensor",
}
PY_TYPE_TO_TORCH_LIST_TYPE = {
int: "!torch.list<int>",
float: "!torch.list<float>",
str: "!torch.list<str>",
bool: "!torch.list<bool>",
"tensor": "!torch.list<tensor>",
"vtensor": "!torch.list<vtensor>",
}
PY_TYPE_TO_TORCH_OPTIONAL_LIST_TYPE = {
int: "!torch.list<optional<int>>",
float: "!torch.list<optional<float>>",
str: "!torch.list<optional<str>>",
bool: "!torch.list<optional<bool>>",
"tensor": "!torch.list<optional<tensor>>",
"vtensor": "!torch.list<optional<vtensor>>",
}
SCALAR_TYPE_TO_TORCH_MLIR_TYPE = {
torch.SymInt: "!torch.int",
torch.SymFloat: "!torch.float",
torch.SymBool: "!torch.bool",
int: "!torch.int",
float: "!torch.float",
str: "!torch.str",
bool: "!torch.bool",
NoneType: "!torch.none",
}
# AOT-autograd sometimes falsely emit tensor version op with scalar arguments.
# We may remove this dictionary, if we fix such behavior in the backend.
TENSOR_SCALAR_OP_CONVERTER = {
"torch.aten.mul.Tensor": "torch.aten.mul.Scalar",
"torch.aten.div.Tensor": "torch.aten.div.Scalar",
"torch.aten.add.Tensor": "torch.aten.add.Scalar",
"torch.aten.sub.Tensor": "torch.aten.sub.Scalar",
"torch.aten.floor_divide": "torch.aten.floor_divide.Scalar",
}
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