def _prob_match(self, features):
        """Compute match probabilities.

        Parameters
        ----------
        features : numpy.ndarray
            The data to train the model on.

        Returns
        -------
        numpy.ndarray
            The match probabilties.
        """

        # compute the probabilities
        probs = self.kernel.predict_proba(features)

        # get the position of match probabilities
        classes = list(self.kernel.classes_)
        match_class_position = classes.index(1)

        return probs[:, match_class_position]