C# ML.NET,“;分数栏“;不见了
我想在ML.NET中创建我的第一个应用程序。我打赌威斯康星州。我自己创建了generate.csv文件。该文件的一条记录如下所示:C# ML.NET,“;分数栏“;不见了,c#,.net-core,ml.net,C#,.net Core,Ml.net,我想在ML.NET中创建我的第一个应用程序。我打赌威斯康星州。我自己创建了generate.csv文件。该文件的一条记录如下所示: B;11.62;18.18;76.38;408.8;0.1175;0.1483;0.102;0.05564;0.1957;0.07255;0.4101;1.74;3.027;27.85;0.01459;0.03206;0.04961;0.01841;0.01807;0.005217;13.36;25.4;88.14;528.1;0.178;0.2878;0.3186
B;11.62;18.18;76.38;408.8;0.1175;0.1483;0.102;0.05564;0.1957;0.07255;0.4101;1.74;3.027;27.85;0.01459;0.03206;0.04961;0.01841;0.01807;0.005217;13.36;25.4;88.14;528.1;0.178;0.2878;0.3186;0.1416;0.266;0.0927
class CancerData
{
[Column(ordinal: "0")]
public string Diagnosis;
[Column(ordinal: "1")]
public float RadiusMean;
[Column(ordinal: "2")]
public float TextureMean;
[Column(ordinal: "3")]
public float PerimeterMean;
//.........
[Column(ordinal: "28")]
public float ConcavPointsWorst;
[Column(ordinal: "29")]
public float SymmetryWorst;
[Column(ordinal: "30")]
public float FractalDimensionWorst;
[Column(ordinal: "31", name: "Label")]
public string Label;
}
得到31个不同的特征(列)
我的CancerData.cs
如下所示:
B;11.62;18.18;76.38;408.8;0.1175;0.1483;0.102;0.05564;0.1957;0.07255;0.4101;1.74;3.027;27.85;0.01459;0.03206;0.04961;0.01841;0.01807;0.005217;13.36;25.4;88.14;528.1;0.178;0.2878;0.3186;0.1416;0.266;0.0927
class CancerData
{
[Column(ordinal: "0")]
public string Diagnosis;
[Column(ordinal: "1")]
public float RadiusMean;
[Column(ordinal: "2")]
public float TextureMean;
[Column(ordinal: "3")]
public float PerimeterMean;
//.........
[Column(ordinal: "28")]
public float ConcavPointsWorst;
[Column(ordinal: "29")]
public float SymmetryWorst;
[Column(ordinal: "30")]
public float FractalDimensionWorst;
[Column(ordinal: "31", name: "Label")]
public string Label;
}
和CancerPrediction.cs
class CancerPrediction
{
[ColumnName("PredictedLabel")]
public string Diagnosis;
}
我的程序.cs
:
class Program
{
static void Main(string[] args)
{
PredictionModel<CancerData, CancerPrediction> model = Train();
Evaluate(model);
}
public static PredictionModel<CancerData, CancerPrediction> Train()
{
var pipeline = new LearningPipeline();
pipeline.Add(new TextLoader("Cancer-train.csv").CreateFrom<CancerData>(useHeader: true, separator: ';'));
pipeline.Add(new Dictionarizer(("Diagnosis", "Label")));
pipeline.Add(new ColumnConcatenator(outputColumn: "Features",
"RadiusMean",
"TextureMean",
"PerimeterMean",
//... all of the features
"FractalDimensionWorst"));
pipeline.Add(new StochasticDualCoordinateAscentBinaryClassifier());
pipeline.Add(new PredictedLabelColumnOriginalValueConverter() { PredictedLabelColumn = "PredictedLabel" });
PredictionModel<CancerData, CancerPrediction> model = pipeline.Train<CancerData, CancerPrediction>();
model.WriteAsync(modelPath);
return model;
}
public static void Evaluate(PredictionModel<CancerData, CancerPrediction> model)
{
var testData = new TextLoader("Cancer-test.csv").CreateFrom<CancerData>(useHeader: true, separator: ';');
var evaluator = new ClassificationEvaluator();
ClassificationMetrics metrics = evaluator.Evaluate(model, testData);
var accuracy = Math.Round(metrics.AccuracyMicro, 2);
Console.WriteLine("The accuracy is: " + accuracy);
Console.ReadLine();
}
}
我得到一个例外:
System.InvalidOperationException:'无法将类型为'R4'的IDataView列'Score'绑定到类型为'System.String'的字段或属性'Score'
一致:
PredictionModel<CancerData, CancerPrediction> model = pipeline.Train<CancerData, CancerPrediction>();
PredictionModel=pipeline.Train();
EDIT2
外观:
EDIT3
将
分隔符
更改为,“
并加载未由我准备的原始数据集,它仍在大喊大叫,因为没有分数
,所以很烦人我相信我知道问题所在
您正在使用一个随机DualCoordinateAscentBinaryClassifier
,它是一个二进制分类器
您正在尝试使用多类分类计算器ClassificationEvaluator
评估结果
我建议您使用BinaryClassificationEvaluator
来评估二进制分类器模型
确切的问题如下:评估者希望列“Score”是一个向量列,其中包含每个类的分数。它找到的是“Score”列,它是一个标量(只是正类的分数)
因此,它抛出了一些复杂的信息
缺少“分数”列
我相信
Score
列需要是一个float
,这可能就是你得到第二个异常的原因。@Jon仍然是相同的分数不存在
谢谢!现在它起作用了。遗憾的是,即使在欧洲,也如此缺乏关于该框架的信息documentation@michasaucer我们正在开发新的API,它在错误消息中会对用户更加友好。事实上,这个特殊的问题可能会变成编译时错误。老实说,我没有深入研究文档是我的错,因为我觉得我在ML方面缺乏经验。我对ML.NET的新特性感到非常兴奋,特别是Keras/TF的API或CNN与imaged一起使用的另一个实现;)