code: def vector_slope(self, vec):
      assert len(vec) == 2
      return abs(vec[1] / (vec[0] + self.eps))
  
imports: import cv2
  import numpy
  from ppocr.utils.utility import check_install
  from numpy.linalg import norm
label_desc: Use image node_id 3 for calling the DRRGTargets obj's underlying member method code with example usage: obj.vector_slope(vec) and returns: abs