code: def diff_segments(a_segments, b_segments):
      
      # Match and re-sequence unmatched tokens
      a_segment_tokens, b_segment_tokens = _cluster_matching_segments(a_segments,
                                                                      b_segments)
  
      # Perform a simple LCS over unmatched tokens and clusters
      clustered_ops = sequence_matcher.diff(a_segment_tokens, b_segment_tokens)
  
      # Return the expanded (de-clustered) operations
      return (op for op in SegmentOperationsExpander(clustered_ops,
                                                     a_segment_tokens,
                                                     b_segment_tokens).expand())
docs: Performs a diff comparison between two pre-clustered
      :class:`deltas.Segment` trees.  In most cases, segmentation
      takes 100X more time than actually performing the diff.
  
      :Parameters:
          a_segments : :class:`deltas.Segment`
              An initial sequence
          b_segments : :class:`deltas.Segment`
              A changed sequence
  
      :Returns:
          An `iterable` of operations.