update comment

python/paddle_serving_server/serve.py

@@ -147,6 +147,9 @@ def start_gpu_card_model(gpu_mode, port, args):  # pylint: disable=doc-string-mi
     op_seq_maker.add_op(read_op)
     for idx, single_model in enumerate(model):
         infer_op_name = "general_infer"
+        # 目前由于ocr的节点Det模型依赖于opencv的第三方库
+        # 只有使用ocr的时候，才会加入opencv的第三方库并编译GeneralDetectionOp
+        # 故此处做特殊处理，当不满足下述情况时，所添加的op默认为GeneralInferOp
         if len(model) == 2 and idx == 0 and single_model == "ocr_det_model":
             infer_op_name = "general_detection"
         else: