code: def transform_annotation(self, ann, duration):
          '''Transform an annotation to chord-tag encoding
  
          Parameters
          ----------
          ann : jams.Annotation
              The annotation to convert
  
          duration : number > 0
              The duration of the track
  
          Returns
          -------
          data : dict
              data['chord'] : np.ndarray, shape=(n, n_labels)
                  A time-varying binary encoding of the chords
          '''
  
          intervals, values = ann.to_interval_values()
  
          chords = []
          for v in values:
              chords.extend(self.encoder.transform([self.simplify(v)]))
  
          dtype = self.fields[self.scope('chord')].dtype
  
          chords = np.asarray(chords)
  
          if self.sparse:
              chords = chords[:, np.newaxis]
  
          target = self.encode_intervals(duration, intervals, chords,
                                         multi=False, dtype=dtype)
  
          return {'chord': targetf transform_annotation(self, ann, duration):
          '''Transform an annotation to chord-tag encoding
  
          Parameters
          ----------
          ann : jams.Annotation
              The annotation to convert
  
          duration : number > 0
              The duration of the track
  
          Returns
          -------
          data : dict
              data['chord'] : np.ndarray, shape=(n, n_labels)
                  A time-varying binary encoding of the chords
          '''
  
          intervals, values = ann.to_interval_values()
  
          chords = []
          for v in values:
              chords.extend(self.encoder.transform([self.simplify(v)]))
  
          dtype = self.fields[self.scope('chord')].dtype
  
          chords = np.asarray(chords)
  
          if self.sparse:
              chords = chords[:, np.newaxis]
  
          target = self.encode_intervals(duration, intervals, chords,
                                         multi=False, dtype=dtype)
  
          return {'chord': target}
docs: Transform an annotation to chord-tag encoding
  
          Parameters
          ----------
          ann : jams.Annotation
              The annotation to convert
  
          duration : number > 0
              The duration of the track
  
          Returns
          -------
          data : dict
              data['chord'] : np.ndarray, shape=(n, n_labels)
                  A time-varying binary encoding of the chords