fix #7534 (#7535)

paddleocr.py

@@ -480,7 +480,8 @@ class PaddleOCR(predict_system.TextSystem):
             params.rec_image_shape = "3, 48, 320"
         else:
             params.rec_image_shape = "3, 32, 320"
-        # download model
+        # download model if using paddle infer
+        if not params.use_onnx:
             maybe_download(params.det_model_dir, det_url)
             maybe_download(params.rec_model_dir, rec_url)
             maybe_download(params.cls_model_dir, cls_url)