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# 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:
@functools.wraps(fn)
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)
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