fix_quantization_imperative_qat

Author: xiaoluomi

python/paddle/quantization/imperative/qat.py

@@ -551,8 +551,6 @@ def save_quantized_model(self, model, path, input_spec=None, **config):
         dirname = os.path.dirname(path)
         basename = os.path.basename(path)
         model_filename = basename + INFER_MODEL_SUFFIX
-        if in_pir_mode():
-            model_filename = basename + '.json'
         params_filename = basename + INFER_PARAMS_SUFFIX
         params_filename = basename + INFER_PARAMS_SUFFIX