fix pdmodel to json (#15122)

Co-authored-by: zhangyubo0722 <zangyubo0722@163.com>

ppocr/utils/save_load.py

@@ -20,6 +20,7 @@ import errno
 import os
 import pickle
 import json
+from packaging import version
 
 import paddle
 
@@ -288,7 +289,8 @@ def update_train_results(config, prefix, metric_info, done_flag=False, last_num=
         config["Global"]["save_model_dir"], "train_result.json"
     )
     save_model_tag = ["pdparams", "pdopt", "pdstates"]
-    if FLAGS_json_format_model:
+    paddle_version = version.parse(paddle.__version__)
+    if FLAGS_json_format_model or paddle_version >= version.parse("3.0.0"):
         save_inference_files = {
             "inference_config": "inference.yml",
             "pdmodel": "inference.json",