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add tot_score inf mask to make training stable

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I find there are some inf in tot_score, it makes model cannot converge, add inf mask can make training more stable.
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qweasdzxcvde 2025-09-08 14:29:57 +08:00 committed by GitHub
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commit 1e3d264b46
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icefall/mmi.py
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@ -124,6 +124,7 @@ def _compute_mmi_loss_exact_non_optimized(
den_tot_scores = den_lats.get_tot_scores(log_semiring=True, use_double_scores=True)
tot_scores = num_tot_scores - den_scale * den_tot_scores
tot_scores = tot_scores.masked_fill(torch.isinf(tot_scores), 0.0)
loss = -1 * tot_scores.sum()
return loss