class_docstr: Image windows are retrieved and analysed by the
  tensorflow graph, this windows aggregator receives
  output window data in numpy array. To access image-level
  information the reader is needed.
class_docstr_tok: ["Image","windows","are","retrieved","and","analysed","by","the","tensorflow","graph",",","this","windows","aggregator","receives","output","window","data","in","numpy","array",".","To","access","image-level","information","the","reader","is","needed","."]
code: def _is_stopping_signal(location_vector):
      if location_vector is None:
          return True
      return np.any(location_vector < 0)
  
file_path: NiftyNet/niftynet/engine/windows_aggregator_base.py
imports: from __future__ import absolute_import, print_function, division
  import os
  import numpy
  import tensorflow
  from niftynet.engine.image_window import N_SPATIAL
label_desc: Use image node_id 6 for calling the ImageWindowsAggregator obj's underlying member method code with example usage: obj._is_stopping_signal(location_vector) and returns: np, True