code: def _check_imageio():
      if not imageio:
          raise ImportError(
              "Failed to import imageio. You must install imageio"
          )
  
file_path: keras-vis/vis/callbacks.py
imports: from __future__ import absolute_import
  import pprint
  import numpy
  from .utils import utils
label_desc: Use image node_id 1 for calling a global function with example usage: _check_imageio() without return types