Unable to use multi GPU with tensorflow recommender

I want to train recommender model by multi GPUs.
I used this tutorial code " [

Recommending movies: retrieval with distribution strategy

](Recommending movies: retrieval with distribution strategy)"
,
but my 2nd GPU’s utilization is around 1~2%.(1st GPU’s utilization is around 40%)
Oct-06-2021 17-53-19

How can I get the second GPU to work properly?

Did you skip this section?