23 lines
742 B
Python
23 lines
742 B
Python
import torch
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lib = torch.library.Library("export", "FRAGMENT") # noqa: TOR901
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lib.define(
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"access_subclass_inner_tensor(Tensor src_subclass_tensor, str attr) -> Tensor"
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)
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@torch.library.impl(lib, "access_subclass_inner_tensor", "Autograd")
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def _access_subclass_inner_tensor(
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src_subclass_tensor: torch.Tensor, attr: str
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) -> torch.Tensor:
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from torch.utils._python_dispatch import is_traceable_wrapper_subclass
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assert is_traceable_wrapper_subclass(src_subclass_tensor)
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val = getattr(src_subclass_tensor, attr, None)
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if val is None or not isinstance(val, torch.Tensor):
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raise RuntimeError(
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f"Attribute {attr} is not a tensor or doesn't exist in {src_subclass_tensor}"
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)
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return val
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