Fix:
Blank transcriptions and WER stuck at 1.0 usually mean a data or label problem.
Check that your labels (transcriptions) and input audio files are correctly paired and non-empty.
Make sure the tokenizer and vocab match your dataset’s text (no unknown or blank tokens).
Verify all audio files are readable and not silent/zero-length.
Review your data collation and batch preparation steps.
Solution provided by Triskel Data Deterministic AI.