無法使用Accord.Net框架實現基本決策樹

我正試圖學習如何在C＃中實現決策樹。我對這個主題非常陌生，我使用Accord網站上給出的例子來學習。我的代碼全部從網站複製，但Visual Studio一直告訴我：由於缺少調試目標，Visual Studio無法開始調試。我的代碼是這一個：無法使用Accord.Net框架實現基本決策樹

using System; 
using System.Collections.Generic; 
using System.Data; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using Accord; 
using Accord.MachineLearning.DecisionTrees; 
using Accord.MachineLearning.DecisionTrees.Learning; 
using Accord.Math; 
using Accord.Statistics.Filters; 

namespace ConsoleApp1 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 


      DataTable data = new DataTable("Mitchell's Tennis Example"); 

      data.Columns.Add("Day", "Outlook", "Temperature", "Humidity", "Wind", "PlayTennis"); 

      data.Rows.Add("D1", "Sunny", "Hot", "High", "Weak", "No"); 
      data.Rows.Add("D2", "Sunny", "Hot", "High", "Strong", "No"); 
      data.Rows.Add("D3", "Overcast", "Hot", "High", "Weak", "Yes"); 
      data.Rows.Add("D4", "Rain", "Mild", "High", "Weak", "Yes"); 
      data.Rows.Add("D5", "Rain", "Cool", "Normal", "Weak", "Yes"); 
      data.Rows.Add("D6", "Rain", "Cool", "Normal", "Strong", "No"); 
      data.Rows.Add("D7", "Overcast", "Cool", "Normal", "Strong", "Yes"); 
      data.Rows.Add("D8", "Sunny", "Mild", "High", "Weak", "No"); 
      data.Rows.Add("D9", "Sunny", "Cool", "Normal", "Weak", "Yes"); 
      data.Rows.Add("D10", "Rain", "Mild", "Normal", "Weak", "Yes"); 
      data.Rows.Add("D11", "Sunny", "Mild", "Normal", "Strong", "Yes"); 
      data.Rows.Add("D12", "Overcast", "Mild", "High", "Strong", "Yes"); 
      data.Rows.Add("D13", "Overcast", "Hot", "Normal", "Weak", "Yes"); 
      data.Rows.Add("D14", "Rain", "Mild", "High", "Strong", "No"); 

      // Create a new codification codebook to 
      // convert strings into integer symbols 
      Codification codebook = new Codification(data, "Outlook", "Temperature", "Humidity", "Wind", "PlayTennis"); 


      // Translate our training data into integer symbols using our codebook: 
      DataTable symbols = codebook.Apply(data); 
      int[][] inputs = symbols.ToArray<int>("Outlook", "Temperature", "Humidity", "Wind"); 
      int[] outputs = symbols.ToArray<int>("PlayTennis"); 

      // Gather information about decision variables 
      DecisionVariable[] attributes = 
{ 
      new DecisionVariable("Outlook",  3), // 3 possible values (Sunny, overcast, rain) 
      new DecisionVariable("Temperature", 3), // 3 possible values (Hot, mild, cool) 
      new DecisionVariable("Humidity", 2), // 2 possible values (High, normal)  
      new DecisionVariable("Wind",  2) // 2 possible values (Weak, strong) 
    }; 

      int classCount = 2; // 2 possible output values for playing tennis: yes or no 

      //Create the decision tree using the attributes and classes 
      DecisionTree tree = new DecisionTree(attributes, classCount); 

      // Create a new instance of the ID3 algorithm 
      ID3Learning id3learning = new ID3Learning(tree); 

      // Learn the training instances! 
      id3learning.Run(inputs, outputs); 

      string answer = codebook.Translate("PlayTennis", tree.Compute(codebook.Translate("Sunny", "Hot", "High", "Strong"))); 

      Console.WriteLine("Calculate for: Sunny, Hot, High, Strong"); 
      Console.WriteLine("Answer: " + answer); 

     } 
    } 
}

P.S.我使用的Visual Studio 2017年社區

來源

2017-04-23 Arman Khosravi

您的項目是否構建？你有沒有設置啓動項目？ –

是的，它建立良好，我已經設置了啓動項目......但我仍然得到相同的錯誤 –

我建議你從頭開始創建一個新項目並重建它。示例代碼的構建和運行沒有問題，** EXCEPT **，您需要替換此行'data.Columns.Add（「Day」，「Outlook」，「Temperature」，「Humidity」，「Wind」，「PlayTennis」）;'帶有個別調用，例如：'data.Columns.Add（「Day」）;' 'data.Columns.Add（「Outlook」）;' 'data.Columns.Add（「Temperature 「）;' 'data.Columns.Add（」Humidity「）;' 'data.Columns.Add（」Wind「）;' 'data.Columns.Add（」PlayTennis「）;'。 – jsanalytics

從this SO question

確保項目的輸出路徑是正確的（項目>屬性>生成>輸出路徑）

轉到菜單建設>配置管理器，並檢查您的主/進入項目是否已檢查生成。如果沒有，請檢查它。

這似乎是解決這個問題大多數用戶使用。

來源

2017-04-23 21:22:29

它並沒有解決我的問題，但無論如何感謝 –

無法使用Accord.Net框架實現基本決策樹

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