机器学习 - 缺少分数列

Question

我正在尝试使用一些随机测试数据的ML.net框架.我的数据存在DepartmentId(1-25)和Body(字符串).我希望我的机器预测应该分配正文的部门(例如在像Zendesk这样的票务系统中).

使用以下代码,我收到一个错误:

ArgumentOutOfRangeException:缺少分数列

我不确定为什么它会说Score列缺失,因为它出现在我的预测课程中.

这是我训练模型以及课程的设置.

主要

var pipeline = new LearningPipeline();
pipeline.Add(new TextLoader(_dataPath).CreateFrom<DepartmentData>(userHeader: true, seperator: ','));
pipeline.Add(new TextFeaturizer("Features", "Body"));
pipeline.Add(new Dictionarizer("Label"));
pipeline.Add(new StochasticDualCoordinateAscentClassifier());
pipeline.Add(new PredictedLabelColumnOriginalValueConverter() { PredictedLabelColumn = "PredictedLabel" });

var model = pipeline.Train<DepartmentData, DepartmentPrediction>();

DepartmentData和DepartmentPrediction

public class DepartmentData
{
    [Column(ordinal: "0", name: "Label")]
    public float Department;
    [Column(ordinal: "1")]
    public string Body;
}

public class DepartmentPrediction
{
    [ColumnName("PredictedLabel")]
    public float Department;

    [ColumnName("Score")]
    public float[] Score;
}

示例数据

Department, Body
1, Hello. 4 weeks ago I requested a replacement keycap for my keyboard. I still ahvent received the keycap. Perhaps you can confirm that it has been shipped?
13, I seem to have some problems when paying for you new mouse XZ-250 I'm being told that my card is not valid?
1, I just received the package I bought from you but I'm most definetly not satisfied with the shipment. The box was bended and broken when it received as well as the GPU inside. I demand that you ship a new one to me without charge. I've attached a few images of the box and the GPU here.
/* etc... */

评估

var testData = new TextLoader(_testDataPath).CreateFrom<DepartmentData>(useHeader: true, seperator: ',');
var evaluator = new ClassificationEvaluator();
var metrics = evaluator.Evaluate(model, testData);