Scala Machine Learning Projects

Auxiliary classes and methods

In the preceding steps, we have seen some classes or methods that we should describe here, too. The first method, named toCategorical(), converts the Frame column from String/Int to enum; this is used to convert dayTime bags (that is, gr1, gr2, gr3, gr4) to a factor-like type. This function is also used to convert the Class column to a factor type in order to perform classification:

def toCategorical(f: Frame, i: Int): Unit = {    f.replace(i, f.vec(i).toCategoricalVec)    f.update()    }

This builds a confusion matrix for anomaly detection according to a threshold if an instance is considered anomalous (if its MSE exceeds the given threshold):

def confusionMat(mSEs:water.fvec.Frame,actualFrame:water.fvec.Frame,thresh: ...