""" APIs related to torch.compile which lazily import torch._dynamo to avoid circular dependencies. """ import functools from typing import Callable, Literal, Optional, overload, TypeVar, Union from typing_extensions import ParamSpec _T = TypeVar("_T") _P = ParamSpec("_P") @overload def _disable_dynamo( fn: Callable[_P, _T], recursive: bool = True ) -> Callable[_P, _T]: ... @overload def _disable_dynamo( fn: Literal[None] = None, recursive: bool = True ) -> Callable[[Callable[_P, _T]], Callable[_P, _T]]: ... def _disable_dynamo( fn: Optional[Callable[_P, _T]] = None, recursive: bool = True ) -> Union[Callable[_P, _T], Callable[[Callable[_P, _T]], Callable[_P, _T]]]: """ This API should be only used inside torch, external users should still use torch._dynamo.disable. The main goal of this API is to avoid circular imports issues that is common while using _dynamo.disable inside torch itself. This API avoids it by lazily importing torch._dynamo from the import time to the invocation of the decorated function. """ if fn is not None: @functools.wraps(fn) def inner(*args: _P.args, **kwargs: _P.kwargs) -> _T: # cache this on the first invocation to avoid adding too much overhead. disable_fn = getattr(fn, "__dynamo_disable", None) if disable_fn is None: import torch._dynamo disable_fn = torch._dynamo.disable(fn, recursive) fn.__dynamo_disable = disable_fn # type: ignore[attr-defined] return disable_fn(*args, **kwargs) return inner else: # decorator usage like @_disable_dynamo(recursive=False). The resulting # object expects the original decorated function as the arg. return functools.partial(_disable_dynamo, recursive=recursive)