class_docstr: Base class for Preparer
class_docstr_tok: ["Base","class","for","Preparer"]
docstr: Do the prepare processing.
docstr_tok: ["Do","the","prepare","processing","."]
code: def do_prepare(self, pre_process_pipeline):
      """Do the prepare processing."""
      raise NotImplementedError
  
imports: import os
  import math
  from pathlib import Path
  from absl import logging
  import delta.compat
  import numpy
  from delta import utils
  from delta.data.preprocess.utils import prepare_embedding
  from delta.utils.solver.utils.solver_utils import get_session_conf
  from delta.data.preprocess.utils import prepare_vocab
  from delta.data.preprocess.utils import prepare_vocab_from_config
  from delta.data.preprocess.utils import get_pre_process_text_ds_iter
  from delta.data.utils.common_utils import get_file_len
label_desc: Use image node_id 4 for calling the Preparer obj's underlying member method code with example usage: obj.do_prepare(pre_process_pipeline) without return types