code: def create_mmap_dataset_builder(fname, dtype):
      logger.info(f"Creating mmap dataset builder at {fname}.")
      return MMapIndexedDatasetBuilder(f"{fname}.bin", dtype=dtype)
  
file_path: deepspeed/deepspeed/runtime/data_pipeline/data_sampling/utils.py
imports: import math
  import numpy
  from deepspeed.utils import logger
  from .indexed_dataset import MMapIndexedDatasetBuilder
label_desc: Use image node_id 4 for calling a global function with example usage: create_mmap_dataset_builder(fname, dtype) and returns: MMapIndexedDatasetBuilder