code: def _sha256(path):
      """Calculate the sha256 hash of the file at path."""
      sha256hash = hashlib.sha256()
      chunk_size = 8192
      with open(path, "rb") as f:
          while True:
              buffer = f.read(chunk_size)
              if not buffer:
                  break
              sha256hash.update(buffer)
      return sha256hash.hexdigest()
  
imports: import csv
  import gzip
  import hashlib
  import os
  import shutil
  from collections import namedtuple
  from numbers import Integral
  from os import environ, listdir, makedirs
  from os.path import expanduser, isdir, join, splitext
  from pathlib import Path
  from urllib.request import urlretrieve
  import numpy
  from ..preprocessing import scale
  from ..utils import Bunch, check_pandas_support, check_random_state
  from ..utils._param_validation import Interval, StrOptions, validate_params
  from ..utils.fixes import _contents, _open_binary, _open_text, _read_text
label_desc: Use image node_id 17 for calling a global function with example usage: _sha256(path) and returns: sha256hash