code: def area_of(left_top, right_bottom):
      """Compute the areas of rectangles given two corners.
      Args:
          left_top (N, 2): left top corner.
          right_bottom (N, 2): right bottom corner.
      Returns:
          area (N): return the area.
      """
      hw = np.clip(right_bottom - left_top, 0.0, None)
      return hw[..., 0] * hw[..., 1]
  
file_path: PaddleOCR/ppocr/postprocess/picodet_postprocess.py
imports: import numpy
  from scipy.special import softmax
label_desc: Use image node_id 3 for calling a global function with example usage: area_of(left_top, right_bottom) and returns: unknown