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llama : fix top-p sampling to match the canonical definition (#1953)

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* Fix top-p sampling to match the standard definition (smallest set that has probability mass at least p, not largest set with probability mass less than p)

* top-p: correct gt to gte

* add test for correct top-p behavior
This commit is contained in:
Alex Renda
2023-06-24 03:15:01 -07:00
committed by GitHub
parent 527b6fba1d
commit b061ba9e2a
2 changed files with 5 additions and 3 deletions
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1
tests/test-sampling.cpp
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@ -181,6 +181,7 @@ int main(void) {
test_top_p({0.1f, 0.2f, 0.3f, 0.4f}, {0.4f}, 0);
test_top_p({0.1f, 0.2f, 0.3f, 0.4f}, {0.4f, 0.3f}, 0.7f);
test_top_p({0.1f, 0.2f, 0.3f, 0.4f}, {0.4f, 0.3f, 0.2f}, 0.8f);
test_top_p({0.1f, 0.2f, 0.3f, 0.4f}, {0.4f, 0.3f, 0.2f, 0.1f}, 1);
test_tfs({0.1f, 0.15f, 0.2f, 0.25f, 0.3f}, {0.3f}, 0.25f);