1、Accord.IO/ExcelReader.cs讀取excel文件，源碼如下：
https://github.com/accord-net/framework/blob/792015d0e2ee250228dfafb99ea0e84d031a29ae/Sources/Accord.IO/ExcelReader.cs
2、繪制數據

Imports Accord.Controls Imports Accord.IO Imports Accord.Math Imports Accord.Statistics.Distributions.Univariate Imports Accord.MachineLearning.Bayes Imports SystemPublic Class Form1'貝葉斯分類'使用Accord.IO里的的excel讀取類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'讀取樣本' 轉換datatable為輸入輸出數組Dim inputs As Double()() = table.ToJagged(Of Double)("X", "Y")Dim outputs As Integer() = table.Columns("G").ToArray(Of Integer)()'繪制數據ScatterplotBox.Show("樣本數據", 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'貝葉斯分類'使用Accord.IO里的的excel讀取類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()'讀取樣本' 轉換datatable為輸入輸出數組Dim sample As Double()() = table.ToJagged(Of Double)("X", "Y")Dim outs As Integer() = table.Columns("G").ToArray(Of Integer)()'繪制數據ScatterplotBox.Show("樣本數據", sample, outs).Hold()'進行訓練和預測Dim trainer As New NaiveBayesLearning(Of NormalDistribution)()Dim nb = trainer.Learn(sample, outs)Dim numberOfClasses As Integer = nb.NumberOfClasses '分類數目Dim numberOfInputs As Integer = nb.NumberOfInputs '特征數量Dim predictResult As Integer() = nb.Decide(sample) '進行預測Label1.Text = numberOfClassesLabel2.Text = numberOfClassesScatterplotBox.Show("實際結果", sample, outs)ScatterplotBox.Show("貝葉斯預測結果", sample, predictResult).Hold()End SubEnd Class

總結

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