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Fix _ArrayField.inner_shape for scalar values in PyTorch contexts.

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.

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@copybara-service copybara-service bot force-pushed the test_850601037 branch 8 times, most recently from 5f5ea27 to 1cb0f58 Compare January 12, 2026 18:13
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: 855281432
@copybara-service copybara-service bot merged commit a21b89b into main Jan 12, 2026
@copybara-service copybara-service bot deleted the test_850601037 branch January 12, 2026 18:20
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