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Per-loss logits_scale_factor #516

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Merged
jlamypoirier merged 1 commit into from
May 15, 2026
Merged

Per-loss logits_scale_factor #516

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9 changes: 9 additions & 0 deletions fast_llm/layers/language_model/loss/config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,15 @@ class LanguageModelLossConfig(Config):
desc="Weight for this loss in the total loss computation.",
valid=check_field(Assert.geq, 0.0),
)
logits_scale_factor: float = Field(
default=1.0,
hint=FieldHint.feature,
desc=(
"Extra logits scale factor applied for this loss only, stacked on top of the model's"
" `logits_scale_factor`."
),
valid=check_field(Assert.gt, 0.0),
)

def get_layer(
self,
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2 changes: 1 addition & 1 deletion fast_llm/layers/language_model/loss/loss.py
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Expand Up @@ -33,7 +33,7 @@ def __init__(
self._prediction_heads = prediction_heads
self._name = name
self._num_splits = num_splits
self._logits_scale_factor = logits_scale_factor
self._logits_scale_factor = logits_scale_factor * self._config.logits_scale_factor
self._weight = weight * self._config.weight
self._do_register_loss = register_loss
self._vocab_parallel = distributed_config.tensor_parallel > 1 and vocab_parallel
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