Python 从Tensorflow服务服务器获取StatusCode.FAILED“前提条件：服务签名密钥”；tensorflow/服务/预测“；找不到

尝试连接到tf服务服务器时，从我的python grpc客户端获取以下错误：

<_Rendezvous of RPC that terminated with:
status = StatusCode.FAILED_PRECONDITION
details = "Serving signature key "tensorflow/serving/predict" not found."
debug_error_string = "{"created":"@1540559424.720048798","description":"Error received from peer","file":"src/core/lib/surface/call.cc","file_line":1099,"grpc_message":"Serving signature key "tensorflow/serving/predict" not found.","grpc_status":9}"
>

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客户端出现此错误的原因是什么？

如果可能，您可以共享客户端代码，以便我们尝试解决此问题。另外，请共享保存的\u Model\u CLI，以便我们了解适用于此模型的SignatureDefs。

prediction_signature = tf.saved_model.signature_def_utils.build_signature_def(
        inputs=input_signature,
        outputs=output_signature,
        method_name=tf.saved_model.signature_constants.PREDICT_METHOD_NAME)

    builder = saved_model_builder.SavedModelBuilder(os.path.join(output_path, str(version_number)))