code: def create_tokens_and_tokentypes(tokens_a, tokens_b, cls_id, sep_id):
      """Merge segments A and B, add [CLS] and [SEP] and build tokentypes."""
  
      tokens = []
      tokentypes = []
      # [CLS].
      tokens.append(cls_id)
      tokentypes.append(0)
      # Segment A.
      for token in tokens_a:
          tokens.append(token)
          tokentypes.append(0)
      # [SEP].
      tokens.append(sep_id)
      tokentypes.append(0)
      # Segment B.
      for token in tokens_b:
          tokens.append(token)
          tokentypes.append(1)
      if tokens_b:
          # [SEP].
          tokens.append(sep_id)
          tokentypes.append(1)
  
      return tokens, tokentypes
  
file_path: ColossalAI/examples/tutorial/sequence_parallel/data/datasets/dataset_utils.py
imports: import collections
  import math
  import time
  import numpy
  from colossalai.logging import get_dist_logger
  from .blendable_dataset import BlendableDataset
  from .indexed_dataset import make_dataset
label_desc: Use image node_id 5 for calling a global function with example usage: create_tokens_and_tokentypes(tokens_a, tokens_b, cls_id, sep_id) and returns: tokens,  tokentypes