Fix LR scheduler accumulation mismatch and tune medium config#13
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- Fix scheduler to use optimizer steps per epoch (len(loader) // accum_steps) instead of raw batch count — LR was never decaying with accum_steps > 1 - Restore correct scheduler/optimizer ordering (scheduler after optimizer) - Scale SpecAugment time masking with sequence length (~2% of frames) - Tune medium config: LR 3e-4→1e-4, seq_len 4096→2048, dropout 0.15→0.2, warmup 1000→500 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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