code: def extract(self, lower_case=True):
      if lower_case:
          return self.input_text.lower().split()
      else:
          return self.input_text.split()
  
file_path: graph4nlp/graph4nlp/pytorch/test/graph_construction/run_batch_graph_embedding_construction.py
imports: import time
  import numpy
  import torch
  from ...data.data import GraphData, to_batch
  from ...data.dataset import DataItem
  from ...modules.utils.padding_utils import pad_2d_vals
  from ...modules.utils.vocab_utils import VocabModel
  from ...modules.graph_embedding_initialization.graph_embedding_initialization import GraphEmbeddingInitialization
label_desc: Use image node_id 2 for calling the RawTextDataItem obj's underlying member method code with example usage: obj.extract(lower_case) and returns: self, self