code: def _skip_slow():
      """
      Use this function to skip slow or highly demanding tests.
  
      Use it as a `Class.setup` method or a `function.setup` attribute.
  
      For example:
  
      >>> from . import _skip_slow
      >>> def time_something_slow():
              pass
      >>> time_something.setup = _skip_slow
      """
      if os.environ.get("ASV_SKIP_SLOW", "0") == "1":
          raise NotImplementedError("Skipping this test...")
  
imports: import os
  import numpy
  import skimage
label_desc: Use image node_id 2 for calling a global function with example usage: _skip_slow() without return types