public static void Run()
{
var ex = new Example(2, new double[] { 1, 3, 2 });
// WithClass test
if (ex.WithClass(5).Class != 5 || !ex.WithClass(5).Features.SequenceEqual(new double[] { 1, 3, 2 }))
throw new Exception("WithClass failed");
// ZScore test
var examples = new Example[] {
new Example(1, new double[] { 1, 7 }),
new Example(3, new double[] { 5, 5 }),
new Example(1, new double[] { 3, 3 }),
}.AsIArray();
IArrayView<double> means, sds;
var zscored = examples.ZScored(out means, out sds);
if (!means.SequenceEqual(new double[] { 3, 5 }))
throw new Exception("Bad means");
if (!sds.SequenceEqual(new double[] { 2, 2 }))
throw new Exception("Bad standard deviations");
foreach (int i in examples.Indices())
foreach (int j in examples[0].Features.Indices())
if (zscored[i].Features[j] != (examples[i].Features[j] - means[j]) / sds[j])
throw new Exception("Bad zscore value");
}
/// <summary>
/// Returns an example whose class is the binary equivalent of the given example's class and
/// whose features are the same as the given example's features
/// </summary>
protected Example ConvertToBinaryExample(Example nonBinaryExample)
{
if (!this.classMap.ContainsKey(nonBinaryExample.Class))
{
switch (this.classMap.Count)
{
case 0:
this.classMap[nonBinaryExample.Class] = this.NegativeExampleValue;
break;
case 1:
this.classMap[nonBinaryExample.Class] = this.classMap.Values.First() == this.NegativeExampleValue
? this.PositiveExampleValue
: this.NegativeExampleValue;
break;
default:
throw new Exception("Class " + nonBinaryExample.Class + " not found!");
}
}
return(nonBinaryExample.WithClass(this.classMap[nonBinaryExample.Class]));
}
/// <summary>
/// Returns an example whose class is the binary equivalent of the given example's class and
/// whose features are the same as the given example's features
/// </summary>
protected Example ConvertToBinaryExample(Example nonBinaryExample)
{
if (!this.classMap.ContainsKey(nonBinaryExample.Class))
{
switch (this.classMap.Count)
{
case 0:
this.classMap[nonBinaryExample.Class] = this.NegativeExampleValue;
break;
case 1:
this.classMap[nonBinaryExample.Class] = this.classMap.Values.First() == this.NegativeExampleValue
? this.PositiveExampleValue
: this.NegativeExampleValue;
break;
default:
throw new Exception("Class " + nonBinaryExample.Class + " not found!");
}
}
return nonBinaryExample.WithClass(this.classMap[nonBinaryExample.Class]);
}
