code: def intrinsic_matrix(self):
      mat = np.array(
          [
              [self.fx, 0.0, self.cx],
              [0.0, self.fy, self.cy],
              [0.0, 0.0, 1.0],
          ]
      )
      return mat
  
file_path: ml-neuman/cameras/pinhole_camera.py
imports: import numpy
label_desc: Use image node_id 6 for calling the PinholeCamera obj's underlying member method code with example usage: obj.intrinsic_matrix() and returns: mat