* test: add engine generation tests for expected invariants
- test_seed_reproducibility
- test_temperature_zero_determinism
- test_max_tokens_respected
- test_num_samples_count
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* Fix temperature test
* add test for seed variation in sampling
Add test for seed variation in sampling with temperature > 0.
* Rename test for clarity
* Shorten assert msg
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Sofie Van Landeghem <svlandeg@users.noreply.github.com>
Previously, when generating multiple samples (num_samples > 1), the first
token after prefill was sampled once and broadcast to all rows, causing
all samples to start identically. Now the prefill logits are expanded to
num_samples and sampled independently for each row.
Also simplified the generation loop by moving the forward pass to the end
of the loop, eliminating the first_iteration flag and if/else branching.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Performance varies by machine and load, making hard assertions flaky.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
