class_docstr: A tree pattern that matches TF expressions with certain op types.
code: def inputs(self):
      return self._inputs
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import abc
  import itertools
  from mmdnn.conversion.common.DataStructure.graph import Graph
label_desc: Use image node_id 4 for calling the OpTypePattern obj's underlying member method code with example usage: obj.inputs() and returns: self