fix distillation model export and pred save (#3869)

tools/export_model.py

@@ -93,6 +93,9 @@ def main():
             for key in config["Architecture"]["Models"]:
                 config["Architecture"]["Models"][key]["Head"][
                     "out_channels"] = char_num
+                # just one final tensor needs to to exported for inference
+                config["Architecture"]["Models"][key][
+                    "return_all_feats"] = False
         else:  # base rec model
             config["Architecture"]["Head"]["out_channels"] = char_num
     model = build_model(config["Architecture"])

tools/infer_rec.py

@@ -121,7 +121,7 @@ def main():
                     if len(post_result[key][0]) >= 2:
                         rec_info[key] = {
                             "label": post_result[key][0][0],
-                            "score": post_result[key][0][1],
+                            "score": float(post_result[key][0][1]),
                         }
                 info = json.dumps(rec_info)
             else: