code: def compileDeltas(self):
      deltaX = []
      deltaY = []
      if self.getCoordWidth() == 2:
          for c in self.coordinates:
              if c is None:
                  continue
              deltaX.append(c[0])
              deltaY.append(c[1])
      else:
          for c in self.coordinates:
              if c is None:
                  continue
              deltaX.append(c)
      bytearr = bytearray()
      self.compileDeltaValues_(deltaX, bytearr)
      self.compileDeltaValues_(deltaY, bytearr)
      return bytearr
  
imports: from fontTools.misc.fixedTools import fixedToFloat, floatToFixed, floatToFixedToStr, strToFixedToFloat, otRound
  from fontTools.misc.textTools import safeEval
  import array
  from collections import Counter, defaultdict
  import io
  import logging
  import struct
  import sys
label_desc: Use image node_id 14 for calling the TupleVariation obj's underlying member method code with example usage: obj.compileDeltas() and returns: bytearr