如何在 Azure ML Web 服务提供的 HttpResponseMessage 中获取预测分数？

Question

所以我目前正在进行 Azure 机器学习实验。我能够创建一个模型并将其 post 作为 Web 服务。我还能够使用创建 Web 服务时生成的 API 文档中提供的 C# 示例 request/response 代码获得响应。

我的问题是，Web 服务提供的响应包含许多信息（一长串信息），包括预测分数，这是我的 C# 应用程序唯一需要的东西。唯一想到的是使用字符串操作方法来提取我想要的信息。但我认为有比这更好的方法。我是 HTTP Request/Response 的新手，所以请详细说明答案和解释。

这是我的代码：

HttpResponseMessage response = await client.PostAsJsonAsync("", scoreRequest);

if (response.IsSuccessStatusCode)
{
    string result = await response.Content.ReadAsStringAsync();
    Console.WriteLine("Result: {0}", result);
}

else
{
    Console.WriteLine(string.Format("The request failed with status code: {0}", response.StatusCode));

    // Print the headers - they include the requert ID and the timestamp, which are useful for debugging the failure
    Console.WriteLine(response.Headers.ToString());

    string responseContent = await response.Content.ReadAsStringAsync();
    Console.WriteLine(responseContent);
}

这是响应消息：

{"Results":{"output1":{"type":"table","value":{"ColumnNames":["clump_thickness","size_uniformity","shape_uniformity","marginal_adhesion","epithelial_size","bare_nucleoli","bland_chromatin","normal_nucleoli","mitoses","Scored Labels","Scored Probabilities"],"ColumnTypes":["Int32","Int32","Int32","Int32","Int32","Nullable`1","Int32","Int32","Int32","Double","Double"],"Values":[["10","10","4","8","1","8","3","10","1","1","0.979712069034576"],["10","10","4","8","1","8","3","10","1","1","0.979712069034576"]]}}}}

我只想要 "Values":[[...]] 内的值，在本例中为第 9 个索引或“1”。

Answer 1

您需要在 AML 实验中使用项目列。目前，您有一个连接到 Web 服务输出的模块。在 web service output 到 select 之前使用 project columns 模块只是您想要发送到我们输出的列。

Answer 2

此外，您可以取消选中评分模块的 "append columns" 属性，如下所示。这将只生成标签和概率列

如何在 Azure ML Web 服务提供的 HttpResponseMessage 中获取预测分数？

How to get the Prediction Score in a HttpResponseMessage provided by a Azure ML Web Service?

c#

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azure-machine-learning-studio