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skip adding param group when no param
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alf/optimizers/optimizers.py

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@@ -490,6 +490,10 @@ def add_param_group(self, param_group):
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if (not self._ignore_param_not_requiring_grad or p.requires_grad)
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]
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if len(param_group['params']) == 0:
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# If no params are in this group, ignore adding
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return
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lr_scheduler = param_group.get('lr_scheduler', None)
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if isinstance(lr_scheduler, Callable):
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self._lr_schedulers.append(lr_scheduler)

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