code: def sha256sum(filename):
      """Compute the sha256 hash for a file."""
      h = hashlib.sha256()
      b = bytearray(128 * 1024)
      mv = memoryview(b)
      with open(filename, "rb", buffering=0) as f:
          for n in iter(lambda: f.readinto(mv), 0):  # type: ignore
              h.update(mv[:n])
      return h.hexdigest()
  
imports: import os
  import io
  import typing
  import hashlib
  import urllib.request
  import urllib.parse
  import cv2
  import imgaug
  import numpy
  import validators
  import typing_extensions
  import matplotlib.pyplot
  from shapely import geometry
  from scipy import spatial
label_desc: Use image node_id 14 for calling a global function with example usage: sha256sum(filename) and returns: h