new_contents: from floppy.node import Node, Input, Output
  
  from chainer import datasets
  import numpy
  
  #TODO(fukatani) make abstract class
  
  class GetMNIST(Node):
      Output('Train', numpy.ndarray)
      Output('TEST', numpy.ndarray)
  
      def run(self):
          # TODO(fukatani) link
          return datasets.get_mnist()
  
  
subject: Add dataset nodes