如何在C#中为我的模型在Cloud Machine Learning Engine上获得在线预测? [英] How do I get online predictions in C# for my model on Cloud Machine Learning Engine?
问题描述
我已经成功地在Cloud ML Engine上的模型上进行了部署,并通过遵循
I have successfully deployed on model on Cloud ML Engine and verified it is working with gcloud ml-engine models predict
by following the instructions, now I want to send predictions to it from my C# app. How do I do that?
推荐答案
The online prediction API is a REST API, so you can use any library for sending HTTPS requests, although you will need to use Google's OAuth library to get your credentials.
请求的格式为JSON,如 docs .
The format of the request is JSON, as described in the docs.
作为示例,请考虑人口普查示例.的客户端可能像这样:
To exemplify, consider the Census example. A client for that might look like:
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using Google.Apis.Auth.OAuth2;
using Newtonsoft.Json;
namespace prediction_client
{
class Person
{
public int age { get; set; }
public String workclass { get; set; }
public String education { get; set; }
public int education_num { get; set; }
public string marital_status { get; set; }
public string occupation { get; set; }
public string relationship { get; set; }
public string race { get; set; }
public string gender { get; set; }
public int capital_gain { get; set; }
public int capital_loss { get; set; }
public int hours_per_week { get; set; }
public string native_country { get; set; }
}
class Prediction
{
public List<Double> probabilities { get; set; }
public List<Double> logits { get; set; }
public Int32 classes { get; set; }
public List<Double> logistic { get; set; }
public override string ToString()
{
return JsonConvert.SerializeObject(this);
}
}
class MainClass
{
static PredictClient client = new PredictClient();
static String project = "MY_PROJECT";
static String model = "census"; // Whatever you deployed your model as
public static void Main(string[] args)
{
RunAsync().Wait();
}
static async Task RunAsync()
{
try
{
Person person = new Person
{
age = 25,
workclass = " Private",
education = " 11th",
education_num = 7,
marital_status = " Never - married",
occupation = " Machine - op - inspct",
relationship = " Own - child",
race = " Black",
gender = " Male",
capital_gain = 0,
capital_loss = 0,
hours_per_week = 40,
native_country = " United - Stats"
};
var instances = new List<Person> { person };
List<Prediction> predictions = await client.Predict<Person, Prediction>(project, model, instances);
Console.WriteLine(String.Join("\n", predictions));
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
class PredictClient {
private HttpClient client;
public PredictClient()
{
this.client = new HttpClient();
client.BaseAddress = new Uri("https://ml.googleapis.com/v1/");
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
}
public async Task<List<O>> Predict<I, O>(String project, String model, List<I> instances, String version = null)
{
var version_suffix = version == null ? "" : $"/version/{version}";
var model_uri = $"projects/{project}/models/{model}{version_suffix}";
var predict_uri = $"{model_uri}:predict";
GoogleCredential credential = await GoogleCredential.GetApplicationDefaultAsync();
var bearer_token = await credential.UnderlyingCredential.GetAccessTokenForRequestAsync();
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", bearer_token);
var request = new { instances = instances };
var content = new StringContent(JsonConvert.SerializeObject(request), Encoding.UTF8, "application/json");
var responseMessage = await client.PostAsync(predict_uri, content);
responseMessage.EnsureSuccessStatusCode();
var responseBody = await responseMessage.Content.ReadAsStringAsync();
dynamic response = JsonConvert.DeserializeObject(responseBody);
return response.predictions.ToObject<List<O>>();
}
}
}
如果尚未在本地运行,则可能必须运行gcloud auth login
来初始化凭据.
You may have to run gcloud auth login
to initialize your credentials before running locally, if you haven't already.
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