code: def give_variables_names(variables):
      """
      Gives unique names to an iterable of variables. Modifies input.
  
      This function is idempotent.
  
      """
      names = [var.name for var in variables]
      h = hist(names)
  
      def bad_var(var):
          return not var.name or h[var.name] > 1
  
      for i, var in enumerate(filter(bad_var, variables)):
          var.name = (var.name or "") + "_%d" % i
  
      if not unique([str(v) for v in variables]):
          raise ValueError(
              "Not all variables have unique names. Maybe you've "
              "named some of the variables identically"
          )
      return variables
  
imports: from __future__ import absolute_import, print_function, division
  import linecache
  import sys
  import traceback
  import numpy
  from six import iteritems, integer_types, string_types, with_metaclass
  from six.moves import StringIO
  from theano import config
  from theano.compat import PY3
label_desc: Use image node_id 17 for calling a global function with example usage: give_variables_names(variables) and returns: variables, unknown