| # mypy: allow-untyped-defs | |
| """ | |
| APIs related to torch.compile which lazily import torch._dynamo to avoid | |
| circular dependencies. | |
| """ | |
| import functools | |
| def _disable_dynamo(fn=None, recursive=True): | |
| """ | |
| 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: | |
| def inner(*args, **kwargs): | |
| # 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 | |
| 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) | |