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- _eval_sample gains clip_idx param (default 0, backward compatible) - Evaluator loops over all dataset clips per adapter, saves one WAV per clip - Reference metrics computed for all clips and averaged - Comparison chart and summary use avg_metrics across all clips - Eliminates bias from evaluating on an unrepresentative single clip Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>