message: Turn error in tpu embedding code into warning. This matches feature column behavior.
diff: @@ -967,10 +967,9 @@ class TPUEmbedding(object):
  i, feature))
  if enqueue_data.sample_indices is None and combiner:
  - raise ValueError('`enqueue_datas_list[{}]` has a feature that has '
  - 'neither `EnqueueData` or `combiner`.'
  - '`feature`: {}, combiner: {}.'.format(
  - i, feature, combiner))
  + logging.warn('No sample indices set for features %f table %f but '
  + 'combiner is set to %s.', feature,
  + self._feature_to_config_dict[feature].table_id, combiner)
  if (enqueue_data.sample_indices is not None and
  enqueue_data.sample_indices.device !=
  