docstr: Write a chunk to the filesystem.
docstr_tok: ["Write","a","chunk","to","the","filesystem","."]
code: def write_chunk(self, on_done: bool = False) -> str:
      """Write a chunk to the filesystem."""
      filename = self.get_chunk_filename()
      self.write_chunk_to_file(
          self._create_chunk(filename, on_done=on_done), filename
      )
      self._chunk_index += 1
      return os.path.join(self._cache_dir, filename)
  
imports: import json
  import os
  import warnings
  from dataclasses import dataclass
  from time import sleep
  from typing import Any, Dict, List, Optional, Tuple, Union
  import numpy
  import torch
  from lightning.data.streaming.compression import _COMPRESSORS, Compressor
  from lightning.data.streaming.constants import _INDEX_FILENAME, _TORCH_GREATER_EQUAL_2_1_0
  from lightning.data.streaming.serializers import Serializer, _get_serializers
  from lightning.data.utilities.env import _DistributedEnv, _WorkerEnv
  from lightning.data.utilities.format import _convert_bytes_to_int, _human_readable_bytes
label_desc: Use image node_id 9 for calling the BinaryWriter obj's underlying member method code with example usage: obj.write_chunk(on_done) and returns: os