class Embedder:

  def __init__(self, embedding_type):

    if embedding_type == 'USE':
      self._embed = USEEncoder()
	#elif embedding_type == 'bert base uncased'
    #elif embedding_type == 'bert base uncased -1 -12'
    else:
      raise NotImplementedError

  def run(self, sentences, batch=None):
    if not batch:
      return self._embedd.run(sentences)

    encoded_list = list()
    for text_batch in self._batch(sentences, batch):
        encoded_list.append(self._embed.run(text_batch))

    return  np.array(list(itertools.chain(*encoded_list)))

  def _batch(self, iterable, n):
    l = len(iterable)
    for ndx in range(0, l, n):
        yield iterable[ndx:min(ndx + n, l)]