code: def _dot(v1, v2):
      return (v1 * v2.conjugate()).real
  
imports: from fontTools.misc.arrayTools import calcBounds, sectRect, rectArea
  from fontTools.misc.transform import Identity
  import math
  from collections import namedtuple
  from math import sqrt, acos, cos, pi
label_desc: Use image node_id 5 for calling a global function with example usage: _dot(v1, v2) and returns: unknown