Release Cerberus models

[davek44]

Summary

Releases the 8 Cerberus replicate models. Each one is a single model with a human head (8,361 tracks) and a mouse head (3,102 tracks), taking 786 kb input at 32 bp resolution. The weights are hosted at gs://seqnn-share/cerberus/.

• releases/cerberus/:
  • download.sh (./download.sh [FOLD|all] [DEST])
  • params.json, which includes the train recipe
  • targets_{human,mouse}.txt
  • verify/ fixtures: synthetic weights, plus each fold × species head
  • README
• Verification:
  • hound_verify now supports joint families. A family is joint when releases/<family>/params.json exists, and its weights live at models/f<n>c0/ instead of models_<species>/.
  • The output head is chosen by species.
  • Hydra models run on CUDA, because the Hydra scan is a Triton kernel with no CPU path.
  • test_published_forward skips CUDA-only families on hosts without a GPU.
• Root README: now leads with Cerberus, with a table comparing the families and a placeholder citation (no DOI yet).

The training data release is pending, and the Cerberus README says so.

Test plan

• hound_verify --family cerberus on GPU with all 8 staged folds: 16/16 PASS (r=1.0, rmse_rel=0). Repeated runs give identical results.
• hound_verify --family cerberus with no weights downloaded (synthetic): PASS for both heads.
• From the public bucket: ./download.sh 0, then hound_verify --family cerberus, on a GPU node: PASS for both heads.
• hound_verify --family borzoi / borzoi_prime on CPU (synthetic): PASS, so the existing fixtures are unchanged.
• pytest src/tests/test_verify.py: 6 passed, 2 skipped (Cerberus on a CPU host).
• ruff format, prettier.

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