!5834 modify _exec_save_checkpoint

Merge pull request !5834 from liuyang/save_checkpoin

model_zoo/official/cv/mobilenetv2/train.py

@@ -26,7 +26,7 @@ from mindspore.nn.loss import SoftmaxCrossEntropyWithLogits
 from mindspore.common import dtype as mstype
 from mindspore.train.model import Model
 from mindspore.train.loss_scale_manager import FixedLossScaleManager
-from mindspore.train.serialization import _exec_save_checkpoint
+from mindspore.train.serialization import save_checkpoint
 from mindspore.common import set_seed
 
 from src.dataset import create_dataset, extract_features
@@ -116,7 +116,7 @@ if __name__ == '__main__':
             .format(epoch + 1, step_size, epoch_mseconds, per_step_mseconds, np.mean(np.array(losses))), \
                 end="")
             if (epoch + 1) % config.save_checkpoint_epochs == 0:
-                _exec_save_checkpoint(network, os.path.join(config.save_checkpoint_path, \
+                save_checkpoint(network, os.path.join(config.save_checkpoint_path, \
                     f"mobilenetv2_head_{epoch+1}.ckpt"))
         print("total cost {:5.4f} s".format(time.time() - start))