class_docstr: A graph object which is read from nnp file.
  
  
  An instance of NnpNetwork is usually created by an NnpLoader instance.
  See an example usage described in :obj:`NnpLoader`.
  
  
  Attributes:
      variables (dict): A dict of all variables in a created graph
          with a variable name as a key, and a nnabla.Variable as a value.
  
      inputs (dict): All input variables.
  
      outputs (dict): All output variables.
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code: def inputs(self):
      return self._inputs
  
imports: from __future__ import print_function
  import itertools
  from collections import OrderedDict
  import nnabla
  import numpy
label_desc: Use image node_id 2 for calling the NnpNetwork obj's underlying member method code with example usage: obj.inputs() and returns: self