code: def save_best(self, val_accuracy):
      if self.best_snapshot_path:
          snapshot_path = self.best_snapshot_path + str(val_accuracy)
          self.save_func(snapshot_path, use_val_saver=True)
  
imports: from __future__ import division, print_function, absolute_import
  import time
  import sys
label_desc: Use image node_id 11 for calling the ModelSaver obj's underlying member method code with example usage: obj.save_best(val_accuracy) without return types