def transform(self, trajs_tuple, y=None):
        """Featurize a several trajectories.

        Parameters
        ----------
        traj_list : list(mdtraj.Trajectory)
            Trajectories to be featurized.

        Returns
        -------
        features : list(np.ndarray), length = len(traj_list)
            The featurized trajectories.  features[i] is the featurized
            version of traj_list[i] and has shape
            (n_samples_i, n_features)
        """
        return [self.partial_transform(traj_zip)
                for traj_zip in zip(*trajs_tuple)]
Featurize a several trajectories.

        Parameters
        ----------
        traj_list : list(mdtraj.Trajectory)
            Trajectories to be featurized.

        Returns
        -------
        features : list(np.ndarray), length = len(traj_list)
            The featurized trajectories.  features[i] is the featurized
            version of traj_list[i] and has shape
            (n_samples_i, n_features)