class_docstr: an indexed dataset that use mmap and memoryview to access data from disk
  that was compressed with a HuffmanCoder.
class_docstr_tok: ["an","indexed","dataset","that","use","mmap","and","memoryview","to","access","data","from","disk","that","was","compressed","with","a","HuffmanCoder","."]
code: def supports_prefetch(self):
      return False
  
imports: import mmap
  import os
  import shutil
  import struct
  import typing
  from functools import lru_cache
  import numpy
  import torch
  from fairseq.data import indexed_dataset
  from fairseq.data.huffman import HuffmanCoder
  from fairseq.file_io import PathManager
label_desc: Use image node_id 12 for calling the HuffmanMMapIndexedDataset obj's underlying member method code with example usage: obj.supports_prefetch() and returns: False