code: def _lower_text(text_list):
      return [text.lower() for text in text_list]
  
imports: import os
  import numpy
  from functools import partial
  from .pipe import Pipe
  from .utils import _drop_empty_instance
  from ..loader.summarization import ExtCNNDMLoader
  from ..data_bundle import DataBundle
  from ...core.vocabulary import Vocabulary
label_desc: Use image node_id 1 for calling a global function with example usage: _lower_text(text_list) and returns: unknown