reference/generated/tensordict.nn.add_custom_mapping

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add_custom_mapping

tensordict.nn.add_custom_mapping(name: str, mapping: Callable[[Tensor], Tensor])

Adds a custom mapping to be used in mapping classes.

Parameters:

• name (str) – a mapping name.

• mapping (callable) – a callable that takes a tensor as input and outputs a tensor with the same shape.

Examples

>>> import torch
>>> from tensordict.nn import add_custom_mapping, NormalParamExtractor
>>> add_custom_mapping("my_mapping", lambda x: torch.zeros_like(x))
>>> npe = NormalParamExtractor(scale_mapping="my_mapping", scale_lb=0.0)
>>> assert (npe(torch.randn(10))[1] == torch.zeros(5)).all()