class_docstr: A variable in the graph (e.g. learning_rate) can be a hyperparam.
docstr: Evaluate the variable. 
docstr_tok: ["Evaluate","the","variable","."]
code: def get_value(self):
      """Evaluate the variable."""
      return self.var.eval()
  
imports: import operator
  import os
  import numpy
  from abc import ABCMeta, abstractmethod
  from collections import deque
  import six
  from ..compat import tfv1
  from ..tfutils.common import get_op_tensor_name
  from ..utils import logger
  from .base import Callback
label_desc: Use image node_id 4 for calling the GraphVarParam obj's underlying member method code with example usage: obj.get_value() and returns: self