public int?Predict(Passenger item, IEnumerable <string> fields)
{
if (CountNo == 0)
{
return(1);
}
if (fields.Count() == 0)
{
return(guessResult());
//int result = P > 0.5 ? 1 : 0;
//return result;
}
var field = fields.First();
//string.Format("{0}.{1}", pFieldName, node1),
var val = UnitTest1.GetPropValue(item, field).ToString();
var fieldName = string.Format("{0}.{1}", field, val);
var ch1 = Children.Where(x => x.FieldName == fieldName).SingleOrDefault();
if (ch1 == null)
{
return(guessResult());
}
if (ch1.CountNo == 0)
{
return(1);
}
return(ch1.Predict(item, fields.Skip(1)));
}
public void BuildChildNode(string pFieldName, TitanicNode parent)
{
var listOfDistinData = parent.DataSet.Select(x => UnitTest1.GetPropValue(x, pFieldName)).Distinct();
foreach (var node1 in listOfDistinData)
{
var node_1_list = parent.DataSet.Where(x => UnitTest1.GetPropValue(x, pFieldName).Equals(node1)).ToList();
var n1 = new TitanicNode
{
FieldName = string.Format("{0}.{1}", pFieldName, node1),
Count = node_1_list.Count,
CountYes = node_1_list.Where(x => x.Survived == 1).Count(),
DataSet = node_1_list,
};
parent.Children.Add(n1);
}
}
public bool Predict(Weather item, IEnumerable <string> fields)
{
if (CountNo == 0)
{
return(true);
}
if (fields.Count() == 0)
{
return(false);
}
var ch1 = Children.Where(x => x.FieldName == UnitTest1.GetPropValue(item, fields.First()).ToString()).Single();
if (ch1.CountNo == 0)
{
return(true);
}
return(ch1.Predict(item, fields.Skip(1)));
}
public double GI <E>(string pFieldName, List <Passenger> dataSet)
where E : struct, IComparable, IFormattable, IConvertible
{
double gi = 0;
double total = dataSet.Count;
double cYes = (from x in dataSet where x.Survived == 1 select x).Count();
List <double> childsE = new List <double>();
List <double> childsP = new List <double>();
foreach (var item in Enum.GetValues(typeof(E)))
{
var en = (E)item;
double t = (from x in dataSet where UnitTest1.GetPropValue(x, pFieldName).Equals(en) select x).Count();
double cCYes = (from x in dataSet where x.Survived == 1 && UnitTest1.GetPropValue(x, pFieldName).Equals(en) select x).Count();
if (t == 0)
{
continue;
}
var e = UnitTest1.Entropy(cCYes / t);
var p = t / total;
childsE.Add(e);
childsP.Add(p);
}
var eP = UnitTest1.Entropy(cYes / total);
double wEC = 0;
for (int i = 0; i < childsE.Count; i++)
{
wEC += childsE[i] * childsP[i];
}
gi = eP - wEC;
return(gi);
}
public double GI(string pFieldName, List <Passenger> dataSet)
{
double gi = 0;
var listOfDistinData = dataSet.Select(x => UnitTest1.GetPropValue(x, pFieldName)).Distinct();
double total = dataSet.Count;
double cYes = (from x in dataSet where x.Survived == 1 select x).Count();
List <double> childsE = new List <double>();
List <double> childsP = new List <double>();
foreach (var item in listOfDistinData)
{
//var en = (E)item;
double t = (from x in dataSet where UnitTest1.GetPropValue(x, pFieldName).Equals(item) select x).Count();
double cCYes = (from x in dataSet where x.Survived == 1 && UnitTest1.GetPropValue(x, pFieldName).Equals(item) select x).Count();
if (t == 0)
{
continue;
}
var e = UnitTest1.Entropy(cCYes / t);
var p = t / total;
childsE.Add(e);
childsP.Add(p);
}
var eP = UnitTest1.Entropy(cYes / total);
double wEC = 0;
for (int i = 0; i < childsE.Count; i++)
{
wEC += childsE[i] * childsP[i];
}
gi = eP - wEC;
return(gi);
}
public int?Predict(Passenger item, IEnumerable <string> fields)
{
if (CountNo == 0)
{
return(1);
}
if (fields.Count() == 0)
{
//int result = s_Generator.NextDouble() <= P ? 1 : 0;
//return result;
int result = P > 0.5 ? 1 : 0;
return(result);
}
var ch1 = Children.Where(x => x.FieldName == UnitTest1.GetPropValue(item, fields.First()).ToString()).Single();
if (ch1.CountNo == 0)
{
return(1);
}
return(ch1.Predict(item, fields.Skip(1)));
}
public void BuildChildNode <E>(string pFieldName, TitanicNode parent)
where E : struct, IComparable, IFormattable, IConvertible
{
foreach (var node1 in Enum.GetValues(typeof(E)))
{
var e = (E)node1;
var node_1_list = parent.DataSet.Where(x => UnitTest1.GetPropValue(x, pFieldName).Equals(e)).ToList();
var n1 = new TitanicNode
{
FieldName = e.ToString(),
Count = node_1_list.Count,
CountYes = node_1_list.Where(x => x.Survived == 1).Count(),
DataSet = node_1_list,
};
parent.Children.Add(n1);
//yield return n1;
//if (n1.CountYes == 0) break;
//if (pFieldName == "") break;
//if (pFieldName == "") break;
//n1.Children.AddRange(BuildChildNode<Humanity>("Humanity", node_1_list));
}
}
