Validate top-k sampling bounds - #789
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Summary
TopkSampling.get_next_tokens()currently passeskdirectly to JAX. Invalid values fail with low-level errors:k=0produces an empty candidate set and categorical sampling fails, while negative values and values larger than the vocabulary fail insidejax.lax.top_k.This validates
kagainst the available vocabulary size before calling JAX and raises a clearValueErrorfor invalid values.Testing
k=0,k=-1, andklarger than the vocabulary size.