code: def get_camera_matrix(self):
      return np.array(
          ((self.fx, 0, self.cx), (0, self.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 6 for calling the Camera obj's underlying member method code with example usage: obj.get_camera_matrix() and returns: np