[Bugfix][LoRA] Log when an adapter applies no weights (#55310)
Signed-off-by: Guancheng Fu <110874468+gc-fu@users.noreply.github.com>
Guancheng Fu committed
Sep 10, 2026 at 01:44 UTC
a207d7ce1d0cc33121726a7189080a0fa40ebb4d
1 file changed
+9
vllm/lora/model_manager.py
+9
@@ -336,6 +336,7 @@ class LoRAModelManager:
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"Activating LoRA. int id: %d, slot index: %d", lora_model.id, index
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)
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self.lora_index_to_id[index] = lora_model.id
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+ num_lora_weights_applied = 0
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for module_name, module in self.modules.items():
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module_lora = self._get_lora_layer_weights(lora_model, module_name)
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if not module_lora:
@@ -350,7 +351,15 @@ class LoRAModelManager:
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module_lora.lora_a,
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module_lora.lora_b,
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)
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+ num_lora_weights_applied += 1
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logger.debug("Successfully loaded LoRA weights for module %s.", module_name)
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+ if num_lora_weights_applied == 0:
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+ logger.debug_once(
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+ "No LoRA weights were applied for adapter %s on this worker. "
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+ "Requests may use the base model; check --lora-target-modules. "
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+ "This may be expected with pipeline or expert parallelism.",
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+ lora_model.id,
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+ )
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return True
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def _deactivate_adapter(self, lora_id: int):