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mel_converter buffers (mel_basis, hann_window) are inference tensors because the model was loaded inside ComfyUI's torch.inference_mode(). Operations on them propagate the flag to outputs. Clone both target_mel and pred_mel to get normal autograd-compatible tensors. .clone() is differentiable so the grad graph to vocoder parameters is preserved. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>