code: def _all_specified(*args):
      for a in args:
          if a is None:
              return False
      return True
  
imports: import numpy
  import warnings
  from scipy import optimize
  from dipy.core.geometry import cart2sphere, sphere2cart, vector_norm
  from dipy.core.onetime import auto_attr
  from dipy.reconst.recspeed import remove_similar_vertices
label_desc: Use image node_id 1 for calling a global function with example usage: _all_specified() and returns: True, False