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heretic/tests/gpt-oss/SHA256SUMS.linux
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benthecarman 8ae8526c9d fix: prevent empty layer range and too many neighbors in ARA (#478)
* Cap ARA's neighbor count at the number of prompts

The nearest neighbors are selected from the outputs for the good and
bad prompts, which have one row per prompt. With fewer than 15 prompts
in either dataset, the optimizer could pick a neighbor count larger
than that, and torch.topk would crash with "selected index k out of
range". Bounding the search range instead of clamping the value keeps
the optimizer from wasting trials on counts that would all behave the
same.

* Render chat templates with a fixed date

Some chat templates, including gpt-oss's, put the current date in the
system prompt. That makes the residuals, and with them the modified
model, depend on the day Heretic runs, so a model could not be
reproduced on a different day. It also made the gpt-oss test's hash
change daily once ARA started modifying the model.

Prompts used for computing residuals and for evaluation are now
rendered with a fixed date. Interactive chat keeps the real one.

* Prevent ARA from sampling an empty layer range

The start index was sampled from [0, L//2] and the exclusive end index
from [L//2, L], so both could land on L//2 and leave no layers to
modify, wasting the trial. Starting the end range at L//2 + 1 rules
this out while keeping the bounds fixed, as multivariate TPE requires.

On the 2-layer test models, every ARA trial had picked this empty
range, so the seed-oss and gpt-oss tests never ran the optimization.
They now modify layer 1, which changes their expected hashes. The
seed-oss output also differs between the CPUs of GitHub's runners,
because L-BFGS amplifies small floating-point differences, so it gets
CI hashes as well.
2026-10-06 12:40:51 +05:30

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f8d9255777615591a7cc1a7c932f5a69e181128902295e1b81221d20d983cac7 *chat_template.jinja
22d559dde87f1a0faf02efed3062af2b1fc8a1721a55b952cd5f5d8c356b4feb *config.json
523e422e425e7a7ba23d85cc0faeef143dc5da37b72bfc649df5a8d83ee95beb *generation_config.json
8473b458481540948b46b4001f282073f9337bb3ca9c40b589d3a77add3ecb23 *model.safetensors
fce342a4642cb8afc42d8d89cfa21198b64a43458ded7f6ff28d1151a08c9cda *tokenizer.json
9ba5fa877168e24823cb583c55b4c2e4df0331f30084953c7cf07de294640384 *tokenizer_config.json