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Record original MT3 real-checkpoint golden MIDI for three backends - #2
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MT3 currently has no committed real-checkpoint regression baseline. This PR records the exact MIDI output of all three backends on the tracked 4-second HappySounds drum sample before compatibility changes, with checkpoint/audio hashes and pinned runtime profiles. The opt-in
MT3_REAL_GOLDEN=1test compares full MIDI messages and bytes; ordinary CI keeps the check skipped when weights are unavailable.YourMT3's historical baseline is captured with Transformers 4.43.4. The current Transformers 5.13.1 incompatibility is documented here and will be addressed separately, preserving this baseline as the acceptance gate.
Validation: default suite 86 passed, 3 skipped, 3 deselected; cached real-weight MR-MT3 and MT3-PyTorch goldens 2 passed on current runtime; cached real-weight YourMT3 golden 1 passed with isolated Transformers 4.43.4; recorder regenerated MR-MT3 with the same MIDI hash.