public static NaiveBayesClassifier Load(List <int[]> instances, int classIndex, double[] classWeightToPrior, double[] classPriorProbability)
{
NaiveBayesClassifier classifier = new NaiveBayesClassifier(classWeightToPrior, classPriorProbability);
classifier.Train(instances, classIndex);
return(classifier);
}
public static Dictionary <String, List <String> > Classify(NaiveBayesClassifier nb, List <DocItem> docItems)
{
Dictionary <String, List <String> > result = new Dictionary <string, List <string> >();
foreach (var item in docItems)
{
var res = nb.predict(item.title + " " + item.body);
result.Add(item.title, res);
Console.ForegroundColor = ConsoleColor.Green;
Console.Write(String.Format("'{0}' is categorised as: ", item.title));
for (int i = 0; i < res.Count; i++)
{
if (i != res.Count - 1)
{
Console.Write(res[i].ToUpper() + ", ");
}
else
{
Console.WriteLine(res[i].ToUpper());
}
}
}
return(result);
}
public static void Main(String[] args)
{
string baseDirPath = Path.GetDirectoryName(Path.GetDirectoryName(System.IO.Directory.GetCurrentDirectory()));
string fileName = baseDirPath + "\\" + ConfigurationManager.AppSettings["knowledgeBase"];
Console.WriteLine("Hello, Welcome to the Multinomial Naive Bayes Classifier\n");
NaiveBayesClassifier nb = new NaiveBayesClassifier();
KnowledgeBase knowledgeBase = null;
//nb.setChisquareCriticalValue(6.63); //0.01 pvalue
if (File.Exists(fileName))
{
string knowledgeBaseStr = File.ReadAllText(fileName, Encoding.UTF8);
knowledgeBase = JsonConvert.DeserializeObject <KnowledgeBase>(knowledgeBaseStr);
}
if (knowledgeBase == null)
{
nb.train();
}
else
{
nb = new NaiveBayesClassifier(knowledgeBase);
}
int userInput;
do
{
userInput = DisplayMenu();
switch (userInput)
{
case 1:
nb.train();
Console.ReadKey();
break;
case 2:
{
Console.WriteLine("Calculating predictions...");
foreach (string file in Directory.EnumerateFiles(baseDirPath + @"\test", "*.json")) //Environment.CurrentDirectory
{
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine("\n\nPress any key to classify news in file: " + file.Substring(file.LastIndexOf('\\') + 1).ToUpper());
Console.ReadKey();
string json = File.ReadAllText(file);
List <DocItem> docItems = JsonConvert.DeserializeObject <List <DocItem> >(json);
Classify(nb, docItems);
}
foreach (string file in Directory.EnumerateFiles(baseDirPath + @"\test", "*.txt")) //Environment.CurrentDirectory
{
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine("\n\nPress any key to classify news in file: " + file.Substring(file.LastIndexOf('\\') + 1).ToUpper());
ConsoleKeyInfo resp = Console.ReadKey();
string text = File.ReadAllText(file);
List <DocItem> docItems = nb.parseSimpleTextFile(text);
Classify(nb, docItems);
Console.ReadKey();
}
}
break;
case 3:
{
Console.WriteLine("Ënter filename: (*.txt) or (*.json)");
var file = Console.ReadLine();
var filePath = baseDirPath + "\\test\\" + file;
if (File.Exists(filePath))
{
string text = File.ReadAllText(filePath);
List <DocItem> docItems;
if (file.Contains("json"))
{
docItems = JsonConvert.DeserializeObject <List <DocItem> >(text);
}
else
{
docItems = nb.parseSimpleTextFile(text);
}
Classify(nb, docItems);
}
else
{
Console.WriteLine("file " + filePath + " does not exist");
}
Console.ReadKey();
}
break;
case 4:
nb.evaluate();
Console.ReadKey();
break;
case 5:
Console.Clear();
break;
}
} while (userInput != 6);
//string appSettingValue = ConfigurationManager.AppSettings["sampleApplication"];
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine("Good Bye !");
Console.ReadKey();
//String exampleEn = "I am English";
//String outputEn = nb.predict(exampleEn);
//System.out.format("The sentense \"%s\" was classified as \"%s\".%n", exampleEn, outputEn);
//String exampleFr = "Je suis Français";
//String outputFr = nb.predict(exampleFr);
//System.out.format("The sentense \"%s\" was classified as \"%s\".%n", exampleFr, outputFr);
//String exampleDe = "Ich bin Deutsch";
//String outputDe = nb.predict(exampleDe);
//System.out.format("The sentense \"%s\" was classified as \"%s\".%n", exampleDe, outputDe);
}
