Fix _ArrayField.inner_shape for scalar values in PyTorch contexts. #95
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Corrected an edge case in `_ArrayField.inner_shape` where, when called on a scalar value (empty `full_shape`) within a PyTorch environment, it now returns an empty shape `()` to prevent shape validation errors, particularly when used inside `torch.vmap`. PiperOrigin-RevId: 855886831
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Fix _ArrayField.inner_shape for scalar values in PyTorch contexts.
Corrected an edge case in
_ArrayField.inner_shapewhere, when called on a scalar value (emptyfull_shape) within a PyTorch environment, it now returns an empty shape()to prevent shape validation errors, particularly when used insidetorch.vmap.