Root cause found: QNN HTP level=1 compilation is not bitwise deterministic. Two loads of the same .pte produce slightly different hidden states → audible trembling in decoded speech. Java pipeline uses single QNN instance → no trembling, validated quality. C++ pipeline code preserved for future use when QNN context caching is fixed (would make both loads use same compiled graph). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> |
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