docstr: To be called at the beginning of running graph variables
docstr_tok: ["To","be","called","at","the","beginning","of","running","graph","variables"]
code: def run_threads(self, session, *args, **argvs):
      """
      To be called at the beginning of running graph variables
      """
      session.run(self.iterator.initializer)
      return
  
file_path: NiftyNet/niftynet/contrib/sampler_pairwise/sampler_pairwise_uniform_csv.py
imports: from __future__ import absolute_import, division, print_function
  import numpy
  import tensorflow
  from niftynet.engine.image_window import ImageWindow
  from niftynet.layer.base_layer import Layer
  from niftynet.layer.grid_warper import AffineGridWarperLayer
  from niftynet.layer.resampler import ResamplerLayer
  from niftynet.layer.linear_resize import LinearResizeLayer
label_desc: Use image node_id 5 for calling the PairwiseUniformSampler obj's underlying member method code with example usage: obj.run_threads(session) without return types