code: def no_dipy():
      """Check if dipy is available."""
      global HAVE_DIPY
      return not HAVE_DIPY
  
file_path: nipype/nipype/interfaces/dipy/base.py
imports: import os.path
  import inspect
  import numpy
  from ...None import logging
  from ..base import traits, File, isdefined, LibraryBaseInterface, BaseInterfaceInputSpec, TraitedSpec
label_desc: Use image node_id 1 for calling a global function with example usage: no_dipy() and returns: unknown