code: def fit(self, sequences, y=None):
          
          MultiSequenceClusterMixin.fit(self, sequences)
          self.cluster_center_indices_ = self._split_indices(self.cluster_center_indices_)
          return self
docs: Fit the kcenters clustering on the data
  
          Parameters
          ----------
          sequences : list of array-like, each of shape [sequence_length, n_features]
              A list of multivariate timeseries, or ``md.Trajectory``. Each
              sequence may have a different length, but they all must have the
              same number of features, or the same number of atoms if they are
              ``md.Trajectory``s.
  
          Returns
          -------
          self