Merged commit includes the following changes: (#7325)

260622966  by A. Unique TensorFlower<gardener@tensorflow.org>:

    Add absl_app import.

--

PiperOrigin-RevId: 260622966

official/recommendation/ncf_keras_main.py

@@ -26,6 +26,7 @@ import json
 import os
 
 # pylint: disable=g-bad-import-order
+from absl import app as absl_app
 from absl import flags
 from absl import logging
 import tensorflow as tf