def METHOD_NAME(self, labeled_featuresets):
    """
    Train (fit) the scikit-learn estimator.
    :param labeled_featuresets: A list of ``(featureset, label)``
        where each ``featureset`` is a dict mapping strings to either
        numbers, booleans or strings.
    """
    X, y = list(zip(*labeled_featuresets))
    X = self._vectorizer.fit_transform(X)
    y = self._encoder.fit_transform(y)
    self._clf.fit(X, y)
    return self