ImportError: cannot import name 'gen_rasterizer_op' when trying to import tensorflow_graphics.rendering.opengl.triangle_rasterizer

Hi, I am new in tensorflow, and when I trying to import tensorflow_graphics.rendering.opengl.triangle_rasterizer, the following error shows:

import tensorflow as tf
import tensorflow_graphics.rendering.opengl.triangle_rasterizer as tr

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
 in ()
      1 import tensorflow as tf
----> 2 import tensorflow_graphics.rendering.opengl.triangle_rasterizer as tr

/home/linfang/.local/lib/python3.6/site-packages/tensorflow_graphics/rendering/opengl/triangle_rasterizer.py in ()
     26 import tensorflow.compat.v2 as tf
     27 
---> 28 from tensorflow_graphics.rendering.opengl import gen_rasterizer_op as render_ops
     29 from tensorflow_graphics.rendering.opengl import math as glm
     30 from tensorflow_graphics.util import export_api

ImportError: cannot import name 'gen_rasterizer_op'

I am using Ubuntu 18.04, and version info:
tensorflow-gpu 2.2.0
tensorflow-graphics 2020.5.20
How can I solve it? Thanks a lot

Reproduce the import from tensorflow_graphics.rendering.opengl.triangle_rasterizer.py using the reported Ubuntu, TensorFlow 2.2.0, and tensorflow-graphics 2020.5.20 versions. Inspect why the import of gen_rasterizer_op fails; the issue is resolved when importing triangle_rasterizer succeeds without that ImportError.