code: def poly_area(x, y):
      """Ref: http://stackoverflow.com/questions/24467972/calculate-area-of-polygon-given-x-y-coordinates"""
      return 0.5 * np.abs(
          np.dot(x, np.roll(y, 1)) - np.dot(y, np.roll(x, 1))
      )
  
file_path: ARKitScenes/threedod/benchmark_scripts/utils/box_utils.py
imports: import numpy
  import scipy.spatial
  from .rotation import rotate_points_along_z
label_desc: Use image node_id 7 for calling a global function with example usage: poly_area(x, y) and returns: unknown