fix: Fix bug in EarlyStop plugin patience counter (#5326)

The patience counter in the EarlyStopping plugin was not reset after a new best loss was found, leading to premature termination of training. This patch resets the counter on improvement.

Author: HuChundong

swift/plugin/callback.py

@@ -19,6 +19,7 @@ def on_save(self, args: TrainingArguments, state: TrainerState, control: Trainer
         operator = np.greater if args.greater_is_better else np.less
         if self.best_metric is None or operator(state.best_metric, self.best_metric):
             self.best_metric = state.best_metric
+            self.interval = 0
         else:
             self.interval += 1