wrong api used

[KimRasak]

def _create_ngcf_embed(self):
  ...
  norm_embeddings = tf.math.l2_normalize(ego_embeddings, axis=1)

will caused AttributeError: module 'tensorflow.math' has no attribute 'l2_normalize' in tensorflow-gpu 1.8.0, so it should be norm_embeddings = tf.nn.l2_normalize(ego_embeddings, axis=1)

def _create_ngcf_embed(self):
  ...
  norm_embeddings = tf.math.l2_normalize(ego_embeddings, axis=1)

will caused AttributeError: module 'tensorflow.math' has no attribute 'l2_normalize' in tensorflow-gpu 1.8.0, so it should be norm_embeddings = tf.nn.l2_normalize(ego_embeddings, axis=1)

same problem, your solution is useful.