fix bug

Author: Han Wang

deepmd/dpmodel/atomic_model/dp_atomic_model.py

@@ -250,7 +250,7 @@ def compute_fitting_input_stat(
         stat_file_path : Optional[DPPath]
             The path to the stat file.
         """
-        self.fitting.compute_input_stats(
+        self.fitting_net.compute_input_stats(
             sample_merged,
             protection=self.data_stat_protect,
             stat_file_path=stat_file_path,