b9f95cfd7e
If no matching key was found for MPD or MRD in the checkpoint, the for-loops completed silently and randomly-initialized discriminators were used as frozen feature extractors — producing meaningless feature matching loss while appearing to work. Now raises RuntimeError (caught by outer except) which triggers the existing fallback to mel+STFT losses with a clear warning. Also prints available checkpoint keys to help diagnose format mismatches. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>