Fix logger issue

Author: yanxi-chen

trinity/algorithm/policy_loss_fn/gspo_policy_loss.py

@@ -11,8 +11,6 @@
 from trinity.algorithm.utils import aggregate_loss, masked_mean
 from trinity.utils.log import get_logger
 
-logger = get_logger(__name__)
-
 
 class GSPOLossFn(PolicyLossFn):
     def __init__(
@@ -35,6 +33,7 @@ def __init__(
         self.clip_range_high = _clip_range_high
 
         if loss_agg_mode != "seq-mean-token-mean":
+            logger = get_logger(__name__)
             logger.warning(
                 f"The original GSPO paper requires loss_agg_mode to be 'seq-mean-token-mean', but the current setting is '{loss_agg_mode}'."
             )