code: def get_inverse_camera_matrix(self):
      return np.array(
          (
              (1.0 / self.fx, 0, -self.cx / self.fx),
              (0, 1.0 / self.fy, -self.cy / self.fy),
              (0, 0, 1),
          )
      )
  
file_path: nerfies/third_party/pycolmap/pycolmap/camera.py
imports: import numpy
  from scipy.optimize import root
label_desc: Use image node_id 7 for calling the Camera obj's underlying member method code with example usage: obj.get_inverse_camera_matrix() and returns: np