public void SVMClassifierTrain(List <Sentence> sentences, ClassifyOptions options, SvmType svm = SvmType.C_SVC, KernelType kernel = KernelType.RBF, bool probability = true, string outputFile = null)
{
var tfidf = new TfIdfFeatureExtractor();
tfidf.Dimension = options.Dimension;
tfidf.Sentences = sentences;
tfidf.CalBasedOnCategory();
featuresInTfIdf = tfidf.Keywords();
// copy test multiclass Model
Problem train = new Problem();
train.X = GetData(sentences, options).ToArray();
train.Y = GetLabels(sentences).ToArray();
train.Count = train.X.Count();
train.MaxIndex = train.X[0].Count();//int.MaxValue;
Parameter param = new Parameter();
transform = RangeTransform.Compute(train);
Problem scaled = transform.Scale(train);
param.Gamma = 1.0 / 3;
param.SvmType = svm;
param.KernelType = kernel;
param.Probability = probability;
int numberOfClasses = train.Y.OrderBy(x => x).Distinct().Count();
if (numberOfClasses == 1)
{
Console.Write("Number of classes must greater than one!");
}
if (svm == SvmType.C_SVC)
{
for (int i = 0; i < numberOfClasses; i++)
{
param.Weights[i] = 1;
}
}
model = Training.Train(scaled, param);
Console.Write("Training finished!");
}
object IClassifier.LoadModel(ClassifyOptions options)
{
options.FeaturesFileName = Path.Combine(options.ModelDir, "features");
options.DictionaryFileName = Path.Combine(options.ModelDir, "dictionary");
options.ModelFilePath = Path.Combine(options.ModelDir, options.ModelName);
options.TransformFilePath = Path.Combine(options.ModelDir, "transform");
options.CategoriesFileName = Path.Combine(options.ModelDir, "categories");
features = JsonConvert.DeserializeObject <List <String> >(File.ReadAllText(options.FeaturesFileName));
dictionary = JsonConvert.DeserializeObject <List <Tuple <string, int> > >(File.ReadAllText(options.DictionaryFileName));
categories = JsonConvert.DeserializeObject <List <String> >(File.ReadAllText(options.CategoriesFileName));
model = Bigtree.Algorithm.SVM.Model.Read(options.ModelFilePath);
options.Transform = RangeTransform.Read(options.TransformFilePath);
return(model);
}
public void SVMClassifierTrain(List <Sentence> sentences, ClassifyOptions options, SvmType svm = SvmType.C_SVC, KernelType kernel = KernelType.RBF, bool probability = true, string outputFile = null)
{
// copy test multiclass Model
Problem train = new Problem();
train.X = GetData(sentences).ToArray();
train.Y = GetLabels(sentences).ToArray();
train.Count = train.X.Count();
train.MaxIndex = train.X[0].Count();//int.MaxValue;
Parameter param = new Parameter();
transform = RangeTransform.Compute(train);
Problem scaled = transform.Scale(train);
param.Gamma = 1.0 / 3;
param.SvmType = svm;
param.KernelType = kernel;
param.Probability = probability;
int numberOfClasses = train.Y.OrderBy(x => x).Distinct().Count();
if (numberOfClasses == 1)
{
throw new ArgumentException("Number of classes can't be one!");
}
if (svm == SvmType.C_SVC)
{
for (int i = 0; i < numberOfClasses; i++)
{
param.Weights[i] = 1;
}
}
model = Training.Train(scaled, param);
Console.Write("Training finished!");
}