code: def encode(chord_labels):
      """
      Encodes chord labels to numeric interval representations.
  
      Parameters
      ----------
      chord_labels : numpy structured array
          Chord segments in `madmom.io.SEGMENT_DTYPE` format
  
      Returns
      -------
      encoded_chords : numpy structured array
          Chords in `CHORD_ANN_DTYPE` format
  
      """
      encoded_chords = np.zeros(
          len(chord_labels), dtype=CHORD_ANN_DTYPE
      )
      encoded_chords["start"] = chord_labels["start"]
      encoded_chords["end"] = chord_labels["end"]
      encoded_chords["chord"] = chords(chord_labels["label"])
      return encoded_chords
  
imports: import numpy
  from .None import evaluation_io, EvaluationMixin
  from ..io import load_chords
label_desc: Use image node_id 1 for calling a global function with example usage: encode(chord_labels) and returns: encoded_chords