!171 Update image for checkpoint_for_hybrid_parallel.md

Merge pull request !171 from TingWang/update-image

tutorials/source_en/advanced_use/checkpoint_for_hybrid_parallel.md

 # Saving and Loading Model Parameters in the Hybrid Parallel Scenario
 
 <!-- TOC -->
+
 - [Saving and Loading Model Parameters in the Hybrid Parallel Scenario](#saving-and-loading-model-parameters-in-the-hybrid-parallel-scenario)
     - [Overview](#overview)
         - [Background](#background)
@@ -76,7 +77,7 @@ Then, update the parameter list and integrate the model parallel parameters. See
 
 Finally, save the updated parameter list to a file through the API provided by MindSpore to generate a new checkpoint file. See step 4 in the following figure.
 
-![img](./images/checkpoint_integration_process.png)
+![img](./images/checkpoint_integration_process.jpg)
 
 ### Preparations