977 lines
39 KiB
Python
977 lines
39 KiB
Python
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import dataclasses
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import functools
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import inspect
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import sys
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import typing
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import weakref
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from torchgen.model import FunctionSchema, OperatorName, SchemaKind, BaseType, ListType, BaseTy
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import torch
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import torch._C as _C
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import torch.library as library
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from torch._library.abstract_impl import AbstractImplCtx
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from torch.library import get_ctx
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from .autograd import autograd_kernel_indirection, construct_autograd_kernel
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"""
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For a detailed guide on custom ops, please see
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https://docs.google.com/document/d/1aGWtgxV3HppuxQAdddyPrs74_aEntpkYt9MalnCKnhk
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This file includes pieces of the implementation of our custom operator API.
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"""
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__all__ = ["custom_op", "CustomOp", "get_ctx", "AbstractImplCtx"]
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SUPPORTED_DEVICE_TYPE_TO_KEY = {
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"cpu": "CPU",
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"cuda": "CUDA",
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}
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# We will not let users register CustomOps with anything that could look like
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# PyTorch internals to avoid confusion.
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RESERVED_NS = {
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"prim",
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"prims",
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"aten",
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"at",
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"torch",
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"pytorch",
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}
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def custom_op(
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qualname: str, manual_schema: typing.Optional[str] = None
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) -> typing.Callable:
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r"""Creates a new CustomOp object.
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WARNING: if you're a user, please do not use this directly
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(instead use the torch._custom_ops APIs).
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Also please see the following for a detailed guide on custom ops.
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https://docs.google.com/document/d/1aGWtgxV3HppuxQAdddyPrs74_aEntpkYt9MalnCKnhk
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In PyTorch, defining an op (short for "operator") is a two step-process:
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- we need to define (create) the op
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- we need to implement behavior for how the operator interacts with
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various PyTorch subsystems, like CPU/CUDA Tensors, Autograd, etc.
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This entrypoint defines the CustomOp object (the first step);
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you must then perform the second step by calling various methods on
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the CustomOp object.
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This API is used as a decorator (see examples).
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Arguments:
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qualname (str): Should be a string that looks like
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"namespace::operator_name". Operators in PyTorch need a namespace to
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avoid name collisions; a given operator may only be created once.
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If you are writing a Python library, we recommend the namespace to
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be the name of your top-level module. The operator_name must be
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the same as the name of the function you pass to custom_op
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(see examples).
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manual_schema (Optional[str]): Each PyTorch operator needs a schema that
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tells PyTorch the types of the inputs/outputs. If None (default),
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we will infer the schema from the type annotations on the function
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(see examples). Otherwise, if you don't want to use type annotations,
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you may provide us the schema string.
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Example::
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>>> # xdoctest: +REQUIRES(env:TORCH_DOCTEST_CUDA)
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>>> import numpy as np
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>>> from torch import Tensor
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>>>
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>>> # Step 1: define the CustomOp.
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>>> # We need to provide the decorator a "prototype function"
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>>> # (a function with Python ellipses as the body).
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>>> @custom_op("my_library::numpy_sin")
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>>> def numpy_sin(x: Tensor) -> Tensor:
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>>> ...
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>>>
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>>> # numpy_sin is now an instance of class CustomOp
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>>> print(type(numpy_sin))
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>>>
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>>> # Step 2: Register an implementation for various PyTorch subsystems
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>>>
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>>> # Register an implementation for CPU tensors
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>>> @numpy_sin.impl('cpu')
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>>> def numpy_sin_impl_cpu(x):
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>>> return torch.from_numpy(np.sin(x.numpy()))
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>>>
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>>> # Register an implementation for CUDA tensors
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>>> @numpy_sin.impl('cuda')
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>>> def numpy_sin_impl_cuda(x):
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>>> return torch.from_numpy(np.sin(x.cpu().numpy())).to(x.device)
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>>>
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>>> x = torch.randn(3)
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>>> numpy_sin(x) # calls numpy_sin_impl_cpu
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>>>
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>>> x_cuda = x.cuda()
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>>> numpy_sin(x) # calls numpy_sin_impl_cuda
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"""
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def inner(func):
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if not inspect.isfunction(func):
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raise ValueError(
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f"custom_op(...)(func): Expected `func` to be a Python "
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f"function, got: {type(func)}"
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)
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ns, name = parse_qualname(qualname)
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validate_namespace(ns)
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if func.__name__ != name:
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raise ValueError(
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f"custom_op(qualname='{qualname}', ...)(func): expected `func` "
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f"to have name '{name}' but got '{func.__name__}'. "
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f"Please either change the name of `func` or the qualname that "
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f"is passed to `custom_op`"
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)
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schema = infer_schema(func) if manual_schema is None else manual_schema
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schema_str = f"{name}{schema}"
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function_schema = FunctionSchema.parse(schema_str)
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validate_schema(function_schema)
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if manual_schema is not None:
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validate_function_matches_schema(function_schema, func)
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lib = library.Library(ns, "FRAGMENT")
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lib.define(schema_str)
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ophandle = find_ophandle_or_throw(ns, function_schema.name)
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result = CustomOp(lib, ns, function_schema, name, ophandle, _private_access=True)
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result.__name__ = func.__name__
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result.__module__ = func.__module__
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result.__doc__ = func.__doc__
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library.impl(lib, result._opname, "Autograd")(
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autograd_kernel_indirection(weakref.proxy(result))
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)
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torch._C._dispatch_set_report_error_callback(
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ophandle, functools.partial(report_error_callback, weakref.proxy(result))
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)
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return result
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return inner
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# Global dictionary holding references to all CustomOp objects
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# Yes, it keeps all CustomOps alive (see NOTE [CustomOp lifetime])
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# Used to query the CustomOp associated with a specific C++ dispatcher operator.
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# An example usage is FakeTensor: FakeTensor checks if a specific operator
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# has an implementation registered via the CustomOp API.
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# Indexed by qualname (e.g. aten::foo)
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global_registry: typing.Dict[str, "CustomOp"] = {}
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class CustomOp:
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r"""Class for custom operators in PyTorch.
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Use the CustomOp API to create user-defined custom operators that behave
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just like regular PyTorch operators (e.g. torch.sin, torch.mm) when it
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comes to various PyTorch subsystems (like torch.compile).
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To construct a `CustomOp`, use `custom_op`.
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"""
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def __init__(self, lib, cpp_ns, schema, operator_name, ophandle, *, _private_access=False):
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super().__init__()
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if not _private_access:
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raise RuntimeError(
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"The CustomOp constructor is private and we do not guarantee "
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"BC for it. Please use custom_op(...) to create a CustomOp object"
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)
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name = f"{cpp_ns}::{operator_name}"
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self._schema = schema
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self._cpp_ns = cpp_ns
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self._lib: library.Library = lib
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self._ophandle: _C._DispatchOperatorHandle = ophandle
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# Has the name of the op, e.g. "foo". We cache here for convenience.
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self._opname: str = operator_name
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# this is _opname but with namespace. e.g. "custom::foo"
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self._qualname: str = name
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self.__name__ = None # mypy requires this
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# NB: Some of these impls are registered as kernels to DispatchKeys.
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# Modifying the _impls dict directly won't do anything in that case.
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self._impls: typing.Dict[str, typing.Optional[FuncAndLocation]] = {}
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# See NOTE [CustomOp autograd kernel indirection]
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self._registered_autograd_kernel_indirection = False
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global_registry[self._qualname] = self
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def _register_autograd_kernel_indirection(self):
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assert not self._registered_autograd_kernel_indirection
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self._lib.impl(self._opname, autograd_kernel_indirection(weakref.proxy(self)), "Autograd")
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self._registered_autograd_kernel_indirection = True
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# Records the impl and the source location in self._impls
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# Note that this doesn't cause torch.library to use the impl, that
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# needs to be done in a separate self._lib.impl call.
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def _register_impl(self, kind, func, stacklevel=2):
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if self._has_impl(kind):
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func_and_location = self._impls[kind]
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assert func_and_location is not None # Pacify mypy
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location = func_and_location.location
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raise RuntimeError(
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f"Attempting to register a {kind} impl for operator {self._qualname} "
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f"that already has a {kind} impl registered from Python at "
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f"{location}. This is not supported."
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)
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frame = inspect.getframeinfo(sys._getframe(stacklevel))
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location = f"{frame.filename}:{frame.lineno}"
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self._impls[kind] = FuncAndLocation(func, location)
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def _get_impl(self, kind):
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return self._impls[kind]
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def _has_impl(self, kind):
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return kind in self._impls
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def _destroy(self):
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# NOTE: [CustomOp lifetime]
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# A CustomOp, once created, lives forever. The mechanism is that the
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# global registry holds a reference to it. However, to make testing
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# easier, we want to be able to destroy CustomOp objects.
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# CustomOp._destroy does the job, though it leaves the CustomOp
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# in a garbage state.
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del self._lib
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opnamespace = getattr(torch.ops, self._cpp_ns)
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if hasattr(opnamespace, self._opname):
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delattr(opnamespace, self._opname)
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del global_registry[self._qualname]
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def __repr__(self):
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return f'<CustomOp(op="{self._qualname}")>'
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def __call__(self, *args, **kwargs):
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# Bypass torch.ops.* and directly do OperatorHandle::callBoxed.
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# Using torch.ops.* is a bit of a pain (it can be slow and it has lifetime
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# issues from caching operators that make testing CustomOp difficult).
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result = _C._dispatch_call_boxed(self._ophandle, *args, **kwargs)
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return result
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def impl(
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self, device_types: typing.Union[str, typing.Iterable[str]], _stacklevel=2,
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) -> typing.Callable:
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r"""Register an implementation for a device type for this CustomOp object.
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WARNING: if you're a user, please do not use this directly
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(instead use the torch._custom_ops APIs).
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Also please see the following for a detailed guide on custom ops.
|
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https://docs.google.com/document/d/1aGWtgxV3HppuxQAdddyPrs74_aEntpkYt9MalnCKnhk
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If the CustomOp is passed multiple Tensor inputs with different device
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types, it will dispatch to the registered implementation for the highest
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priority device type among those present.
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The supported device types, in order of priority, are {'cuda', 'cpu'}.
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This API is used as a decorator (see examples).
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Arguments:
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device_types (str or Iterable[str]): the device type(s) to register the function for.
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Examples::
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>>> # xdoctest: +REQUIRES(env:TORCH_DOCTEST_CUDA)
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>>> import numpy as np
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>>> from torch import Tensor
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>>>
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>>> @custom_op("my_library::numpy_cos")
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>>> def numpy_cos(x: Tensor) -> Tensor:
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>>> ...
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>>>
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>>> # Register an implementation for CPU Tensors
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>>> @numpy_cos.impl('cpu')
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>>> def numpy_cos_impl_cpu(x):
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>>> return torch.from_numpy(np.cos(x.numpy()))
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>>>
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>>> # Register an implementation for CUDA Tensors
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>>> @numpy_cos.impl('cuda')
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>>> def numpy_cos_impl_cuda(x):
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>>> return torch.from_numpy(np.cos(x.cpu().numpy())).to(x.device)
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>>>
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>>> x = torch.randn(3)
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>>> numpy_cos(x) # calls numpy_cos_impl_cpu
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>>>
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>>> x_cuda = x.cuda()
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>>> numpy_cos(x) # calls numpy_cos_impl_cuda
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"""
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if isinstance(device_types, str):
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device_types = [device_types]
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for device_type in device_types:
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validate_device_type(device_type)
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def inner(f):
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for device_type in set(device_types):
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self._check_doesnt_have_library_impl(device_type)
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self._register_impl(device_type, f, stacklevel=_stacklevel)
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dispatch_key = SUPPORTED_DEVICE_TYPE_TO_KEY[device_type]
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library.impl(self._lib, self._opname, dispatch_key)(f)
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return f
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return inner
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def _check_doesnt_have_library_impl(self, device_type):
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if self._has_impl(device_type):
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return
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key = SUPPORTED_DEVICE_TYPE_TO_KEY[device_type]
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if _C._dispatch_has_computed_kernel_for_dispatch_key(self._qualname, key):
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raise RuntimeError(
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f"impl(..., device_types={device_type}): the operator {self._qualname} "
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f"already has an implementation for this device type via a "
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f"pre-existing torch.library or TORCH_LIBRARY registration.")
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def impl_factory(self) -> typing.Callable:
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r"""Register an implementation for a factory function."""
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def inner(f):
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self._register_impl("factory", f)
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library.impl(self._lib, self._opname, "BackendSelect")(f)
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return f
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return inner
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def impl_abstract(self, _stacklevel=2) -> typing.Callable:
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r"""Register an abstract implementation for this operator.
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||
|
|
|
||
|
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WARNING: please do not use this directly (and instead use the torch._custom_ops
|
||
|
|
APIs). Also please see the following for a detailed guide on custom ops.
|
||
|
|
https://docs.google.com/document/d/1aGWtgxV3HppuxQAdddyPrs74_aEntpkYt9MalnCKnhk
|
||
|
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An "abstract implementation" specifies the behavior of this operator on
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Tensors that carry no data. Given some input Tensors with certain properties
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||
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(sizes/strides/storage_offset/device), it specifies what the properties of
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the output Tensors are.
|
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The abstract implementation has the same signature as the operator.
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|
|
It is run for both FakeTensors and meta tensors. To write an abstract
|
||
|
|
implementation, assume that all Tensor inputs to the operator are
|
||
|
|
regular CPU/CUDA/Meta tensors, but they do not have storage, and
|
||
|
|
you are trying to return regular CPU/CUDA/Meta tensor(s) as output.
|
||
|
|
The abstract implementation must consist of only PyTorch operations
|
||
|
|
(and may not directly access the storage or data of any input or
|
||
|
|
intermediate Tensors).
|
||
|
|
|
||
|
|
This API is used as a decorator (see examples).
|
||
|
|
|
||
|
|
Examples::
|
||
|
|
>>> import numpy as np
|
||
|
|
>>> from torch import Tensor
|
||
|
|
>>>
|
||
|
|
>>> # Example 1: an operator without data-dependent output shape
|
||
|
|
>>> @custom_op('my_library::custom_linear')
|
||
|
|
>>> def custom_linear(x: Tensor, weight: Tensor, bias: Tensor) -> Tensor:
|
||
|
|
>>> ...
|
||
|
|
>>>
|
||
|
|
>>> @custom_linear.impl_abstract()
|
||
|
|
>>> def custom_linear_abstract(x, weight):
|
||
|
|
>>> assert x.dim() == 2
|
||
|
|
>>> assert weight.dim() == 2
|
||
|
|
>>> assert bias.dim() == 1
|
||
|
|
>>> assert x.shape[1] == weight.shape[1]
|
||
|
|
>>> assert weight.shape[0] == bias.shape[0]
|
||
|
|
>>> assert x.device == weight.device
|
||
|
|
>>>
|
||
|
|
>>> return (x @ weight.t()) + bias
|
||
|
|
>>>
|
||
|
|
>>> # Example 2: an operator with data-dependent output shape
|
||
|
|
>>> @custom_op('my_library::custom_nonzero')
|
||
|
|
>>> def custom_nonzero(x: Tensor) -> Tensor:
|
||
|
|
>>> ...
|
||
|
|
>>>
|
||
|
|
>>> @custom_nonzero.impl_abstract()
|
||
|
|
>>> def custom_nonzero_abstract(x):
|
||
|
|
>>> # Number of nonzero-elements is data-dependent.
|
||
|
|
>>> # Since we cannot peek at the data in an abstract impl,
|
||
|
|
>>> # we use the ctx object to construct a new symint that
|
||
|
|
>>> # represents the data-dependent size.
|
||
|
|
>>> ctx = torch._custom_op.get_ctx()
|
||
|
|
>>> nnz = ctx.create_unbacked_symint()
|
||
|
|
>>> shape = [x.dim(), nnz]
|
||
|
|
>>> result = x.new_empty(shape, dtype=torch.long)
|
||
|
|
>>> return result
|
||
|
|
>>>
|
||
|
|
>>> @custom_nonzero.impl(['cpu', 'cuda'])
|
||
|
|
>>> def custom_nonzero_impl(x):
|
||
|
|
>>> x_np = to_numpy(x)
|
||
|
|
>>> res = np.stack(np.nonzero(x_np), axis=1)
|
||
|
|
>>> # unbacked symbolic ints in PyTorch must be >= 2, so we
|
||
|
|
>>> # constrain the range to at least 2
|
||
|
|
>>> if res.shape[0] <= 1:
|
||
|
|
>>> raise RuntimeError("not supported")
|
||
|
|
>>> return torch.tensor(res, device=x.device)
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
def inner(f):
|
||
|
|
self._check_doesnt_have_library_meta_impl()
|
||
|
|
self._register_impl("abstract", f, stacklevel=_stacklevel)
|
||
|
|
location = self._get_impl("abstract").location
|
||
|
|
|
||
|
|
qualname = self._qualname
|
||
|
|
|
||
|
|
# Handle DispatchKey.Meta registration
|
||
|
|
@functools.wraps(f)
|
||
|
|
def f_with_ctx(*args, **kwargs):
|
||
|
|
def error_on_ctx():
|
||
|
|
raise RuntimeError(
|
||
|
|
f"Attempted to call get_ctx() for the meta implementation "
|
||
|
|
f"for {qualname}."
|
||
|
|
f"You have presumably called get_ctx() because the operator "
|
||
|
|
f"has a data-dependent output shape; if so, there is no "
|
||
|
|
f"such meta implementation and this error is the correct "
|
||
|
|
f"behavior. Otherwise, please remove the call to get_ctx() "
|
||
|
|
f"in the implementation registered with impl_abstract "
|
||
|
|
f"at {location}"
|
||
|
|
)
|
||
|
|
|
||
|
|
with torch._library.abstract_impl.set_ctx_getter(error_on_ctx):
|
||
|
|
return f(*args, **kwargs)
|
||
|
|
|
||
|
|
self._lib.impl(self._opname, f_with_ctx, "Meta")
|
||
|
|
return f
|
||
|
|
|
||
|
|
return inner
|
||
|
|
|
||
|
|
def _check_can_register_backward(self):
|
||
|
|
def error(detail):
|
||
|
|
raise RuntimeError(
|
||
|
|
f"Cannot use torch._custom_ops APIs to register backward "
|
||
|
|
f"formula for {detail}. Got operator "
|
||
|
|
f"{self._qualname} with schema: {schema}"
|
||
|
|
)
|
||
|
|
|
||
|
|
schema = self._schema
|
||
|
|
if schema.kind() != SchemaKind.functional:
|
||
|
|
error("non-functional operator")
|
||
|
|
|
||
|
|
rets = schema.returns
|
||
|
|
if not schema.returns:
|
||
|
|
error("operator with no returns")
|
||
|
|
|
||
|
|
assert len(rets) > 0
|
||
|
|
is_non_mutating_view = any(
|
||
|
|
r.annotation is not None and not r.annotation.is_write for r in rets
|
||
|
|
)
|
||
|
|
if is_non_mutating_view:
|
||
|
|
error("operator that returns views")
|
||
|
|
|
||
|
|
# We make assumptions about the schema's return types.
|
||
|
|
allowed_return_types = {
|
||
|
|
BaseType(BaseTy.int): "int",
|
||
|
|
BaseType(BaseTy.SymInt): "SymInt",
|
||
|
|
BaseType(BaseTy.bool): "bool",
|
||
|
|
BaseType(BaseTy.float): "float",
|
||
|
|
BaseType(BaseTy.Tensor): "Tensor",
|
||
|
|
ListType(BaseType(BaseTy.Tensor), None): "List[Tensor]",
|
||
|
|
}
|
||
|
|
for ret in schema.returns:
|
||
|
|
if ret.type in allowed_return_types:
|
||
|
|
continue
|
||
|
|
error(f"operator with return not in {list(allowed_return_types.values())} (got {ret.type})")
|
||
|
|
|
||
|
|
def _check_doesnt_have_library_autograd_impl(self):
|
||
|
|
if self._registered_autograd_kernel_indirection:
|
||
|
|
return
|
||
|
|
|
||
|
|
if _C._dispatch_has_kernel_for_dispatch_key(self._qualname, "CompositeImplicitAutograd"):
|
||
|
|
raise RuntimeError(
|
||
|
|
f"impl_backward/impl_save_for_backward: the operator {self._qualname} "
|
||
|
|
f"already has an implementation for this device type via a "
|
||
|
|
f"pre-existing registration to DispatchKey::CompositeImplicitAutograd."
|
||
|
|
f"CompositeImplicitAutograd operators do not need an autograd formula; "
|
||
|
|
f"instead, the operator will decompose into its constituents and those "
|
||
|
|
f"can have autograd formulas defined on them.")
|
||
|
|
|
||
|
|
# We can improve this by adding "all Autograd<BACKEND> keys", but
|
||
|
|
# realistically people will just be using this API for CPU/CUDA for now.
|
||
|
|
for key in ["Autograd", "AutogradCPU", "AutogradCUDA"]:
|
||
|
|
if _C._dispatch_has_kernel_for_dispatch_key(self._qualname, key):
|
||
|
|
raise RuntimeError(
|
||
|
|
f"impl_backward/impl_save_for_backward: "
|
||
|
|
f"the operator {self._qualname} already has an Autograd kernel "
|
||
|
|
f"registered to DispatchKey::{key} vi a pre-existing "
|
||
|
|
f"torch.library or TORCH_LIBRARY registration. Please either "
|
||
|
|
f"remove those registrations or don't use the torch._custom_ops APIs")
|
||
|
|
|
||
|
|
def _check_doesnt_have_library_meta_impl(self):
|
||
|
|
if self._has_impl("abstract"):
|
||
|
|
return
|
||
|
|
|
||
|
|
# If the user's operator is CompositeExplicitAutograd,
|
||
|
|
# allow them to impl_abstract. This is being pragmatic
|
||
|
|
# (existing custom ops may have CompositeExplicitAutograd
|
||
|
|
# registration that don't work with Meta kernels, so this
|
||
|
|
# gives them an escape hatch).
|
||
|
|
if (
|
||
|
|
_C._dispatch_has_kernel_for_dispatch_key(self._qualname, "CompositeExplicitAutograd")
|
||
|
|
and not _C._dispatch_has_kernel_for_dispatch_key(self._qualname, "Meta")
|
||
|
|
):
|
||
|
|
return
|
||
|
|
|
||
|
|
# Otherwise, if the user's already has a Meta kernel or their
|
||
|
|
# op is CompositeImplicitAutograd or some other alias dispatch key,
|
||
|
|
# raise.
|
||
|
|
|
||
|
|
# Special case for CompositeImplicitAutograd
|
||
|
|
if _C._dispatch_has_kernel_for_dispatch_key(self._qualname, "CompositeImplicitAutograd"):
|
||
|
|
raise RuntimeError(
|
||
|
|
f"impl_abstract(...): the operator {self._qualname} "
|
||
|
|
f"already has an implementation for this device type via a "
|
||
|
|
f"pre-existing registration to DispatchKey::CompositeImplicitAutograd."
|
||
|
|
f"CompositeImplicitAutograd operators do not need an abstract impl; "
|
||
|
|
f"instead, the operator will decompose into its constituents and those "
|
||
|
|
f"can have abstract impls defined on them.")
|
||
|
|
|
||
|
|
if _C._dispatch_has_kernel_for_dispatch_key(self._qualname, "Meta"):
|
||
|
|
raise RuntimeError(
|
||
|
|
f"impl_abstract(...): the operator {self._qualname} "
|
||
|
|
f"already has an DispatchKey::Meta implementation via a "
|
||
|
|
f"pre-existing torch.library or TORCH_LIBRARY registration. "
|
||
|
|
f"Please either remove that registration or don't call impl_abstract.")
|
||
|
|
|
||
|
|
# NOTE ["backward", "save_for_backward", and "autograd"]
|
||
|
|
# As a part of the explicit autograd API, a user must provide us
|
||
|
|
# a "save_for_backward" function and a "backward" function.
|
||
|
|
# When both of these have been provided, then we automatically
|
||
|
|
# construct the "autograd" kernel.
|
||
|
|
def _register_autograd_kernel(self):
|
||
|
|
assert self._has_impl("backward")
|
||
|
|
assert self._has_impl("save_for_backward")
|
||
|
|
kernel = construct_autograd_kernel(
|
||
|
|
self._schema,
|
||
|
|
self._output_differentiability,
|
||
|
|
self,
|
||
|
|
get_op(self._qualname),
|
||
|
|
self._get_impl("save_for_backward").func,
|
||
|
|
self._get_impl("backward").func)
|
||
|
|
self._register_impl("autograd", kernel)
|
||
|
|
|
||
|
|
def impl_save_for_backward(self, _stacklevel=2):
|
||
|
|
r"""Register a function that tells us what to save for backward.
|
||
|
|
|
||
|
|
Please see impl_backward for more details.
|
||
|
|
"""
|
||
|
|
def inner(f):
|
||
|
|
self._check_can_register_backward()
|
||
|
|
self._check_doesnt_have_library_autograd_impl()
|
||
|
|
if not self._registered_autograd_kernel_indirection:
|
||
|
|
self._register_autograd_kernel_indirection()
|
||
|
|
self._register_impl("save_for_backward", f, stacklevel=_stacklevel)
|
||
|
|
if self._has_impl("backward"):
|
||
|
|
self._register_autograd_kernel()
|
||
|
|
return inner
|
||
|
|
|
||
|
|
def impl_backward(self, output_differentiability=None, _stacklevel=2):
|
||
|
|
r"""Registers a backward formula.
|
||
|
|
|
||
|
|
WARNING: if you're a user, please do not use this directly
|
||
|
|
(instead use the torch._custom_ops APIs).
|
||
|
|
Also please see the following for a detailed guide on custom ops.
|
||
|
|
https://docs.google.com/document/d/1aGWtgxV3HppuxQAdddyPrs74_aEntpkYt9MalnCKnhk
|
||
|
|
|
||
|
|
In order for the CustomOp to work with autograd, you need to register
|
||
|
|
a backward formula. There are two pieces to this:
|
||
|
|
1. You must give us a function to specify what to save for backward.
|
||
|
|
Call this the "save for backward" function.
|
||
|
|
2. You must give us a function that computes gradients. Call this the
|
||
|
|
"backward" function.
|
||
|
|
|
||
|
|
Use `impl_save_for_backward` to define a "save for backward" function
|
||
|
|
that specifies what gets saved for backward. The function should accept
|
||
|
|
two arguments ``(inputs, output)`` and return the quantities to be saved
|
||
|
|
for backward.
|
||
|
|
|
||
|
|
During runtime, when you call the CustomOp, PyTorch will invoke the
|
||
|
|
"save for backward" function with the inputs and output of the CustomOp.
|
||
|
|
|
||
|
|
Use `impl_backward` to define the "backward" function. The backward
|
||
|
|
function must accept ``(ctx, saved, *grads)``:
|
||
|
|
- ``ctx`` is a context object where we may provide information
|
||
|
|
- ``saved`` is exactly what gets returned from the "save for backward"
|
||
|
|
function
|
||
|
|
- ``grads`` is one or more gradients. The number of gradients matches
|
||
|
|
the number of outputs of the CustomOp.
|
||
|
|
|
||
|
|
The backward function must return a dict that maps the name of
|
||
|
|
an input to the CustomOp to its corresponding gradient. All inputs that
|
||
|
|
were declared to be Tensors in the CustomOp definition must be accounted
|
||
|
|
for in the dict. The gradient may be a Tensor or None.
|
||
|
|
|
||
|
|
"""
|
||
|
|
if output_differentiability is not None:
|
||
|
|
def yell():
|
||
|
|
raise RuntimeError(
|
||
|
|
f"impl_backward(output_differentiability): expected "
|
||
|
|
f"output_differentiability to be a list of bools with "
|
||
|
|
f"length equal to the number of outputs of this CustomOp "
|
||
|
|
f"got: {output_differentiability}")
|
||
|
|
|
||
|
|
if not isinstance(output_differentiability, list):
|
||
|
|
yell()
|
||
|
|
for diff in output_differentiability:
|
||
|
|
if not isinstance(diff, bool):
|
||
|
|
yell()
|
||
|
|
if len(self._schema.returns) != len(output_differentiability):
|
||
|
|
yell()
|
||
|
|
|
||
|
|
def inner(f):
|
||
|
|
self._check_can_register_backward()
|
||
|
|
self._check_doesnt_have_library_autograd_impl()
|
||
|
|
if not self._registered_autograd_kernel_indirection:
|
||
|
|
self._register_autograd_kernel_indirection()
|
||
|
|
self._register_impl("backward", f, stacklevel=_stacklevel)
|
||
|
|
self._output_differentiability = output_differentiability
|
||
|
|
if self._has_impl("save_for_backward"):
|
||
|
|
self._register_autograd_kernel()
|
||
|
|
return inner
|
||
|
|
|
||
|
|
|
||
|
|
@dataclasses.dataclass
|
||
|
|
class FuncAndLocation:
|
||
|
|
func: typing.Callable
|
||
|
|
location: str
|
||
|
|
|
||
|
|
|
||
|
|
def find_ophandle_or_throw(cpp_ns: str, operator_name: OperatorName):
|
||
|
|
overload_name = (
|
||
|
|
"" if operator_name.overload_name is None else operator_name.overload_name
|
||
|
|
)
|
||
|
|
return _C._dispatch_find_schema_or_throw(
|
||
|
|
f"{cpp_ns}::{str(operator_name.name)}", overload_name
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def validate_namespace(ns: str) -> None:
|
||
|
|
if "." in ns:
|
||
|
|
raise ValueError(
|
||
|
|
f'custom_op(..., ns="{ns}"): expected ns to not contain any . (and be a '
|
||
|
|
f"valid variable name)"
|
||
|
|
)
|
||
|
|
if ns in RESERVED_NS:
|
||
|
|
raise ValueError(
|
||
|
|
f"custom_op(..., ns='{ns}'): '{ns}' is a reserved namespace, "
|
||
|
|
f"please choose something else. "
|
||
|
|
)
|
||
|
|
|
||
|
|
def validate_schema(schema: FunctionSchema) -> None:
|
||
|
|
if not torch._library.utils.is_functional_schema(schema):
|
||
|
|
raise ValueError(
|
||
|
|
f"custom_op only supports functional operators "
|
||
|
|
f"(ops that do not mutate any inputs, do not return "
|
||
|
|
f"views of the inputs, and has at least one return). "
|
||
|
|
f"Got the following non-functional schema: {schema}"
|
||
|
|
)
|
||
|
|
|
||
|
|
# For simplicity: don't allow self arguments
|
||
|
|
if schema.arguments.self_arg is not None:
|
||
|
|
raise ValueError(
|
||
|
|
f"custom_op does not support arguments named 'self'. Please "
|
||
|
|
f"rename your argument. Got: {schema}"
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def parse_qualname(qualname: str) -> typing.Tuple[str, str]:
|
||
|
|
names = qualname.split("::", 1)
|
||
|
|
if len(names) != 2:
|
||
|
|
raise ValueError(f"Expected there to be a namespace in {qualname}, i.e. The "
|
||
|
|
f"operator name should look something like ns::foo")
|
||
|
|
if '.' in names[1]:
|
||
|
|
raise ValueError(f"The torch.custom_ops APIs do not handle overloads, "
|
||
|
|
f"i.e. operator names with '.' in them. "
|
||
|
|
f"Please name your operator something like ns::foo. "
|
||
|
|
f"Got: {qualname}")
|
||
|
|
return names[0], names[1]
|
||
|
|
|
||
|
|
|
||
|
|
def validate_device_type(device_type: str) -> None:
|
||
|
|
if device_type not in SUPPORTED_DEVICE_TYPE_TO_KEY:
|
||
|
|
raise ValueError(
|
||
|
|
f"CustomOp.impl(device_types=[{device_type}, ...]): we only support device_type "
|
||
|
|
f"in {SUPPORTED_DEVICE_TYPE_TO_KEY.keys()}."
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def supported_param(param: inspect.Parameter) -> bool:
|
||
|
|
return param.kind in (
|
||
|
|
inspect.Parameter.POSITIONAL_OR_KEYWORD,
|
||
|
|
inspect.Parameter.KEYWORD_ONLY,
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def validate_function_matches_schema(
|
||
|
|
schema: FunctionSchema, func: typing.Callable
|
||
|
|
) -> None:
|
||
|
|
sig = inspect.signature(func)
|
||
|
|
|
||
|
|
if not all(supported_param(p) for _, p in sig.parameters.items()):
|
||
|
|
raise ValueError(
|
||
|
|
f"custom_op(..., manual_schema)(func): positional-only args, "
|
||
|
|
f"varargs, and kwargs are not supported. Please rewrite `func` "
|
||
|
|
f"to not have them. Got `func` with signature: {sig}"
|
||
|
|
)
|
||
|
|
|
||
|
|
if (
|
||
|
|
any(
|
||
|
|
p.annotation is not inspect.Parameter.empty
|
||
|
|
for _, p in sig.parameters.items()
|
||
|
|
)
|
||
|
|
or sig.return_annotation is not inspect.Signature.empty
|
||
|
|
):
|
||
|
|
raise ValueError(
|
||
|
|
f"custom_op(..., manual_schema)(func): When passing in a manual "
|
||
|
|
f"schema, we expect `func` to have no type annotations to avoid "
|
||
|
|
f"ambiguity. Got `func` with signature: {sig}"
|
||
|
|
)
|
||
|
|
|
||
|
|
positional = [
|
||
|
|
(name, param)
|
||
|
|
for name, param in sig.parameters.items()
|
||
|
|
if param.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD
|
||
|
|
]
|
||
|
|
kwargonly = [
|
||
|
|
(name, param)
|
||
|
|
for name, param in sig.parameters.items()
|
||
|
|
if param.kind == inspect.Parameter.KEYWORD_ONLY
|
||
|
|
]
|
||
|
|
|
||
|
|
def error():
|
||
|
|
raise ValueError(
|
||
|
|
f"custom_op(..., manual_schema)(func): When passing in a manual "
|
||
|
|
f"schema, we expect `func`'s signature to match `manual_schema` "
|
||
|
|
f"(aside from type annotations). "
|
||
|
|
f"func's signature: {sig}, manual_schema: {schema}"
|
||
|
|
)
|
||
|
|
|
||
|
|
def error_default_args():
|
||
|
|
raise ValueError(
|
||
|
|
f"custom_op(..., manual_schema)(func): "
|
||
|
|
f"neither func nor manual_schema should have default "
|
||
|
|
f"arguments. Got "
|
||
|
|
f"func's signature: {sig}, manual_schema: {schema}"
|
||
|
|
)
|
||
|
|
|
||
|
|
def compare(sig_args, schema_args):
|
||
|
|
if len(sig_args) != len(schema_args):
|
||
|
|
error()
|
||
|
|
for (name, param), arg in zip(sig_args, schema_args):
|
||
|
|
if name != arg.name:
|
||
|
|
error()
|
||
|
|
if param.default is not inspect.Parameter.empty or arg.default is not None:
|
||
|
|
error_default_args()
|
||
|
|
|
||
|
|
compare(positional, schema.arguments.flat_positional)
|
||
|
|
compare(kwargonly, schema.arguments.flat_kwarg_only)
|
||
|
|
|
||
|
|
|
||
|
|
def infer_schema(prototype_function: typing.Callable) -> str:
|
||
|
|
sig = inspect.signature(prototype_function)
|
||
|
|
|
||
|
|
def error_fn(what):
|
||
|
|
raise ValueError(
|
||
|
|
f"custom_op(...)(func): {what} " f"Got func with signature {sig})"
|
||
|
|
)
|
||
|
|
|
||
|
|
params = [
|
||
|
|
parse_param(name, param, error_fn) for name, param in sig.parameters.items()
|
||
|
|
]
|
||
|
|
ret = parse_return(sig.return_annotation, error_fn)
|
||
|
|
return f"({', '.join(params)}) -> {ret}"
|
||
|
|
|
||
|
|
|
||
|
|
def parse_param(name, param, error_fn):
|
||
|
|
if not supported_param(param):
|
||
|
|
error_fn("We do not support positional-only args, varargs, or varkwargs.")
|
||
|
|
|
||
|
|
if param.annotation is inspect.Parameter.empty:
|
||
|
|
error_fn(f"Parameter {name} must have a type annotation.")
|
||
|
|
|
||
|
|
if param.annotation not in SUPPORTED_PARAM_TYPES.keys():
|
||
|
|
error_fn(
|
||
|
|
f"Parameter {name} has unsupported type {param.annotation}. "
|
||
|
|
f"The valid types are: {SUPPORTED_PARAM_TYPES.keys()}."
|
||
|
|
)
|
||
|
|
|
||
|
|
if param.default is not inspect.Parameter.empty:
|
||
|
|
error_fn(
|
||
|
|
f"Parameter {name} has a default value; this is not supported. "
|
||
|
|
f"If you want to use default values then create a function with "
|
||
|
|
f"default values that calls the CustomOp"
|
||
|
|
)
|
||
|
|
|
||
|
|
return f"{SUPPORTED_PARAM_TYPES[param.annotation]} {name}"
|
||
|
|
|
||
|
|
|
||
|
|
def derived_types(
|
||
|
|
base_type, cpp_type, list_base, optional_base_list, optional_list_base
|
||
|
|
):
|
||
|
|
result = [
|
||
|
|
(base_type, cpp_type),
|
||
|
|
(typing.Optional[base_type], f"{cpp_type}?"),
|
||
|
|
]
|
||
|
|
if list_base:
|
||
|
|
result.append((typing.Sequence[base_type], f"{cpp_type}[]")) # type: ignore[valid-type]
|
||
|
|
if optional_base_list:
|
||
|
|
result.append((typing.Sequence[typing.Optional[base_type]], f"{cpp_type}?[]")) # type: ignore[valid-type]
|
||
|
|
if optional_list_base:
|
||
|
|
result.append((typing.Optional[typing.Sequence[base_type]], f"{cpp_type}[]?")) # type: ignore[valid-type]
|
||
|
|
return result
|
||
|
|
|
||
|
|
|
||
|
|
def get_supported_param_types():
|
||
|
|
data = [
|
||
|
|
# (python type, schema type, type[] variant, type?[] variant, type[]? variant
|
||
|
|
(torch.Tensor, "Tensor", True, True, False),
|
||
|
|
(int, "SymInt", True, False, True),
|
||
|
|
(float, "float", True, False, True),
|
||
|
|
(bool, "bool", True, False, True),
|
||
|
|
(str, "str", False, False, False),
|
||
|
|
(torch.types.Number, "Scalar", True, False, False),
|
||
|
|
(torch.dtype, "ScalarType", False, False, False),
|
||
|
|
(torch.device, "Device", False, False, False),
|
||
|
|
]
|
||
|
|
result = []
|
||
|
|
for line in data:
|
||
|
|
result.extend(derived_types(*line))
|
||
|
|
return dict(result)
|
||
|
|
|
||
|
|
|
||
|
|
SUPPORTED_RETURN_TYPES = {
|
||
|
|
torch.Tensor: "Tensor",
|
||
|
|
typing.List[torch.Tensor]: "Tensor[]",
|
||
|
|
int: "SymInt",
|
||
|
|
float: "float",
|
||
|
|
bool: "bool",
|
||
|
|
torch.types.Number: "Scalar",
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def parse_return(annotation, error_fn):
|
||
|
|
origin = typing.get_origin(annotation)
|
||
|
|
if origin is not tuple:
|
||
|
|
if annotation not in SUPPORTED_RETURN_TYPES.keys():
|
||
|
|
error_fn(
|
||
|
|
f"Return has unsupported type {annotation}. "
|
||
|
|
f"The valid types are: {SUPPORTED_RETURN_TYPES}."
|
||
|
|
)
|
||
|
|
return SUPPORTED_RETURN_TYPES[annotation]
|
||
|
|
|
||
|
|
args = typing.get_args(annotation)
|
||
|
|
for arg in args:
|
||
|
|
if arg not in SUPPORTED_RETURN_TYPES:
|
||
|
|
error_fn(
|
||
|
|
f"Return has unsupported type {annotation}. "
|
||
|
|
f"The valid types are: {SUPPORTED_RETURN_TYPES}."
|
||
|
|
)
|
||
|
|
|
||
|
|
return "(" + ", ".join([SUPPORTED_RETURN_TYPES[arg] for arg in args]) + ")"
|
||
|
|
|
||
|
|
|
||
|
|
SUPPORTED_PARAM_TYPES = get_supported_param_types()
|
||
|
|
|
||
|
|
|
||
|
|
def report_error_callback(custom_op: typing.Any, key: str) -> None:
|
||
|
|
if key == "Undefined":
|
||
|
|
raise NotImplementedError(
|
||
|
|
f"{custom_op}: There were no Tensor inputs to this operator "
|
||
|
|
f"(e.g. you passed an empty list of Tensors). If your operator is a "
|
||
|
|
f"factory function (that is, it takes no Tensors and constructs "
|
||
|
|
f"a new one), then please use CustomOp.impl_factory to register "
|
||
|
|
f"an implementation for it"
|
||
|
|
)
|
||
|
|
if key == "Meta":
|
||
|
|
raise NotImplementedError(
|
||
|
|
f"{custom_op}: when running with device='Meta' tensors: there is no "
|
||
|
|
f"abstract impl registered for this CustomOp. Please register one via "
|
||
|
|
f"CustomOp.impl_abstract to get this CustomOp to work with Meta tensors"
|
||
|
|
)
|
||
|
|
if key in ("CPU", "CUDA"):
|
||
|
|
device = key.lower()
|
||
|
|
raise NotImplementedError(
|
||
|
|
f"{custom_op}: when running with device='{device}' tensors: there is no "
|
||
|
|
f"{device} impl registered for this CustomOp. Please register one via "
|
||
|
|
f"CustomOp.impl(device_type='{device}')"
|
||
|
|
)
|
||
|
|
raise NotImplementedError(
|
||
|
|
f"{custom_op}: No implementation for dispatch key {key}. It is likely "
|
||
|
|
f"that we have not added this functionality yet, please either open an "
|
||
|
|
f"issue or if you're feeling adventurous, use the low-level "
|
||
|
|
f"torch.library API"
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def custom_op_from_existing(op):
|
||
|
|
ns = op.namespace
|
||
|
|
lib = torch.library.Library(ns, "FRAGMENT")
|
||
|
|
name = op.name().split("::")[-1]
|
||
|
|
schema_str = str(op._schema)
|
||
|
|
# CustomOp expects the schema string without the namespace
|
||
|
|
schema_str = schema_str.split("::")[-1]
|
||
|
|
schema = FunctionSchema.parse(schema_str)
|
||
|
|
return CustomOp(lib, ns, schema, name, op, _private_access=True)
|
||
|
|
|
||
|
|
|
||
|
|
def get_op(qualname):
|
||
|
|
def error_not_found():
|
||
|
|
raise ValueError(
|
||
|
|
f"Could not find the operator {qualname}. Please make sure you have "
|
||
|
|
f"already registered the operator and (if registered from C++) "
|
||
|
|
f"loaded it via torch.ops.load_library.")
|
||
|
|
|
||
|
|
ns, name = parse_qualname(qualname)
|
||
|
|
if not hasattr(torch.ops, ns):
|
||
|
|
error_not_found()
|
||
|
|
opnamespace = getattr(torch.ops, ns)
|
||
|
|
if not hasattr(opnamespace, name):
|
||
|
|
error_not_found()
|
||
|
|
packet = getattr(opnamespace, name)
|
||
|
|
if not hasattr(packet, 'default'):
|
||
|
|
error_not_found()
|
||
|
|
return packet.default
|
||
|
|
|
||
|
|
|
||
|
|
def _find_custom_op(qualname, also_check_torch_library=False):
|
||
|
|
if qualname in global_registry:
|
||
|
|
return global_registry[qualname]
|
||
|
|
if not also_check_torch_library:
|
||
|
|
raise RuntimeError(
|
||
|
|
f"Could not find custom op \"{qualname}\". Did you register it via "
|
||
|
|
f"the torch._custom_ops API?")
|
||
|
|
overload = get_op(qualname)
|
||
|
|
result = custom_op_from_existing(overload)
|
||
|
|
return result
|
||
|
|
|
||
|
|
|
||
|
|
def get_abstract_impl(qualname):
|
||
|
|
if qualname not in torch._custom_op.impl.global_registry:
|
||
|
|
return None
|
||
|
|
custom_op = torch._custom_op.impl.global_registry[qualname]
|
||
|
|
if custom_op is None:
|
||
|
|
return None
|
||
|
|
if not custom_op._has_impl("abstract"):
|
||
|
|
return None
|
||
|
|
return custom_op._get_impl("abstract").func
|
||
|
|
|
||
|
|
|
||
|
|
def _custom_op_with_schema(qualname, schema, needs_fixed_stride_order=True):
|
||
|
|
ns, name = qualname.split("::")
|
||
|
|
schema_str = f"{name}{schema}"
|
||
|
|
function_schema = FunctionSchema.parse(schema_str)
|
||
|
|
validate_schema(function_schema)
|
||
|
|
tags = [torch._C.Tag.needs_fixed_stride_order] if needs_fixed_stride_order else []
|
||
|
|
lib = library.Library(ns, "FRAGMENT")
|
||
|
|
lib.define(schema_str, tags=tags)
|
||
|
|
ophandle = find_ophandle_or_throw(ns, function_schema.name)
|
||
|
|
result = CustomOp(lib, ns, function_schema, name, ophandle, _private_access=True)
|
||
|
|
result._register_autograd_kernel_indirection()
|
||
|
|
|
||
|
|
torch._C._dispatch_set_report_error_callback(
|
||
|
|
ophandle, functools.partial(report_error_callback, weakref.proxy(result))
|
||
|
|
)
|
||
|
|
return get_op(qualname)
|