.net随笔-vb.net Accord.Net机器学习之贝叶斯分类

1、Accord.IO/ExcelReader.cs读取excel文件，源码如下：
https://github.com/accord-net/framework/blob/792015d0e2ee250228dfafb99ea0e84d031a29ae/Sources/Accord.IO/ExcelReader.cs
2、绘制数据

Imports Accord.Controls
Imports Accord.IO
Imports Accord.Math
Imports Accord.Statistics.Distributions.Univariate
Imports Accord.MachineLearning.Bayes
Imports SystemPublic Class Form1'贝叶斯分类'使用Accord.IO里的的excel读取类Dim table As DataTable = New ExcelReader("E:\pro\books\AI_.net\src\AI_learn\learnai-1\data\examples.xls").GetWorksheet("Classification - Yin Yang")Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click'读取样本' 转换datatable为输入输出数组Dim inputs As Double()() = table.ToJagged(Of Double)("X", "Y")Dim outputs As Integer() = table.Columns("G").ToArray(Of Integer)()'绘制数据ScatterplotBox.Show("样本数据", inputs, outputs).Hold()End SubEnd Class

Imports Accord.Controls
Imports Accord.IO
Imports Accord.Math
Imports Accord.Statistics.Distributions.Univariate
Imports Accord.MachineLearning.Bayes
Imports SystemPublic Class Form1'贝叶斯分类'使用Accord.IO里的的excel读取类Dim table As DataTable = New ExcelReader("E:\pro\books\AI_.net\src\AI_learn\learnai-1\data\examples.xls").GetWorksheet("Classification - Yin Yang")Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.ClickNaiveBayes()End SubPrivate Sub NaiveBayes()'读取样本' 转换datatable为输入输出数组Dim sample As Double()() = table.ToJagged(Of Double)("X", "Y")Dim outs As Integer() = table.Columns("G").ToArray(Of Integer)()'绘制数据ScatterplotBox.Show("样本数据", sample, outs).Hold()'进行训练和预测Dim trainer As New NaiveBayesLearning(Of NormalDistribution)()Dim nb = trainer.Learn(sample, outs)Dim numberOfClasses As Integer = nb.NumberOfClasses '分类数目Dim numberOfInputs As Integer = nb.NumberOfInputs '特征数量Dim predictResult As Integer() = nb.Decide(sample) '进行预测Label1.Text = numberOfClassesLabel2.Text = numberOfClassesScatterplotBox.Show("实际结果", sample, outs)ScatterplotBox.Show("贝叶斯预测结果", sample, predictResult).Hold()End SubEnd Class

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