code: def split(self, threshold=30):
      seg_num = math.ceil((self.end - self.start) / threshold)
      if seg_num == 1:
          return [self.segs]
      avg = (self.end - self.start) / seg_num
      return_seg = []
  
      start_time = self.start
      cache_seg = []
      for seg in self.segs:
          cache_time = seg[1] - start_time
          if cache_time > avg:
              return_seg.append(cache_seg)
              start_time = seg[0]
              cache_seg = [seg]
          else:
              cache_seg.append(seg)
  
      return_seg.append(cache_seg)
      return return_seg
  
imports: import argparse
  import math
  import os
  import sys
  import music21
  from espnet2.fileio.score_scp import SingingScoreWriter, XMLReader
label_desc: Use image node_id 3 for calling the SegInfo obj's underlying member method code with example usage: obj.split(threshold) and returns: return_seg, list