Stabilizing Classifier

Train a classifier iterativley, resampling labels probabilistically until they stabilize. Built-in outlier removal based on density in PCA space (removes the 10% least dense points).

stable_label_adata(adata, label_key, ...)	A wrapper for stable_label() that handles categorical labels.
stable_label(x, y, classifier, *[, ...])	Trains a classifier using a semi-supervised approach where labels are probabilistically reassigned based on classifier predictions.