code: def get_inv_camera_matrix(self):
      inv_fx, inv_fy = 1.0 / self.fx, 1.0 / self.fy
      return np.array(
          (
              (inv_fx, 0, -inv_fx * self.cx),
              (0, inv_fy, -inv_fy * self.cy),
              (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 10 for calling the Camera obj's underlying member method code with example usage: obj.get_inv_camera_matrix() and returns: np