Qwen3.8-27B-MTP-4bit-g64

mtp-head/ — optional in-branch MTP head weights

This directory is an OPTIONAL editable path (benchmark.json optionalEditablePaths). It carries MTP head weights only when a submission declares "source": "in_branch" in ../mtp-head.manifest.json. The checked-in declaration selects "source": "pinned" — the organizer-pinned head (EigenLabs/Qwen3.8-27B-MTP-bf16), fetched and digest-verified by the runner out of band — and with a pinned or remote source the runner NEVER reads weights from this directory.

Why this README is checked in

Submission archive tooling tars every editablePaths entry and fails on a path that does not exist on disk, even an optional one (yukon submit: ENOENT ... lstat '.../mtp-head'). This file keeps the directory present so archiving succeeds while shipping no weights. It is inert for scoring by construction, four times over: a top-level README.md is EXCLUDED from the head tree digest (rule below), the path is exempt from the editable-surface byte budget (editableSurfaceByteBudget.exemptPaths), it is excluded from the static-review payload, and a pinned/remote source never consults the directory at all. Keep this file in place — including alongside in-branch weights, where the digest exclusion makes it invisible to verification.

Declaring your own head in this directory

Set ../mtp-head.manifest.json to "source": "in_branch" with a path under mtp-head/, plus the sha256 and bytes of what you ship (both required and enforced; the runner refuses on mismatch or above max_bytes, 2 GiB).

TREE DIGEST RULE (mirrored from the trusted CLI's provenance sealing, so you can recompute the number you are asked to declare): SHA-256 over the concatenation, in LC_ALL=C sorted relative-path order, of "<hex file sha256> <relative path>\n" for every regular file in the tree except a top-level README.md. bytes is the byte total of the same file set. Equivalent shell, run inside the head directory:

find . -type f ! -name README.md \
  | sed 's|^\./||' \
  | LC_ALL=C sort \
  | while read -r f; do
      printf '%s  %s\n' "$(shasum -a 256 "$f" | awk '{print $1}')" "$f"
    done | shasum -a 256

A head only PROPOSES tokens — the organizer-pinned target decides every emitted token, and the baseline leg of every ranked pair runs the pinned head regardless of what this directory or the declaration says.