Create an classifier that is indexed and contains a featurizer, given a model, a featurizer, and maps giving the indices of the labels and features (where the index of feature in the array is the index of the parameter in the model).
Create an classifier that is indexed and contains a featurizer, given a model, a featurizer, and maps giving the indices of the labels and features (where the index of feature in the array is the index of the parameter in the model).
Create an IndexedClassifier given a model and arrays for labels and features (where the index of feature in the array is the index of the parameter in the model).
Create an IndexedClassifier given a model and arrays for labels and features (where the index of feature in the array is the index of the parameter in the model).
Companion object to help with constructing Classifiers.