code: def partial_fit(self, sequence, y=None):
          
          s = super(MultiSequencePreprocessingMixin, self)
          if hasattr(s, 'fit'):
              return s.fit(sequence)
          return self
docs: Fit Preprocessing to X.
          Parameters
          ----------
          sequence : array-like, [sequence_length, n_features]
              A multivariate timeseries.
          y : None
              Ignored
          Returns
          -------
          self