[doc] jnp.take: better description of unique_indices & indices_are_sorted

[jakevdp]

Fixes #33489

[gemini-code-assist]

Summary of Changes

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This pull request focuses on enhancing the documentation for the jnp.take function within JAX. It provides more precise descriptions for the unique_indices and indices_are_sorted parameters, clarifying their interaction with negative index normalization and detailing the expected behavior when these assumptions are not met. The goal is to improve user understanding and guide more efficient use of these performance-optimizing flags.

Highlights

• Documentation Clarity: The docstrings for the unique_indices and indices_are_sorted parameters of the jnp.take function have been updated for improved clarity.
• Negative Index Normalization: The documentation now explicitly states that the assumptions of unique_indices and indices_are_sorted apply after the normalization of negative indices.
• Behavior for Invalid Assumptions: The description of the resulting behavior when unique_indices or indices_are_sorted are set to True but the actual indices do not meet these conditions has been refined from 'undefined' to 'implementation-defined' or 'implementation-defined and may be non-deterministic'.
• Backward Pass Efficiency: The unique_indices parameter's docstring now mentions that this assumption can lead to more efficient code during the backward pass.

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[gemini-code-assist]

Code Review

This pull request improves the documentation for jnp.take by providing more accurate and detailed descriptions for the unique_indices and indices_are_sorted parameters. The changes clarify that these properties are assumed after the normalization of negative indices and specify the behavior for violating these assumptions as implementation-defined, which is more precise. The updated docstrings are a good improvement.