parameters: (self,
                 group_key_start=1,
                 op_instance_key_start=100,
                 variable_instance_key_start=1000000)
docstring: Initializes the object.
  
      Args:
        group_key_start: the starting integer of group key.
        op_instance_key_start: the starting integer of instance key for ops.
        variable_instance_key_start: the starting integer of instance key for
          variables.
docstring_summary: Initializes the object.
docstring_tokens: Initializes the object .
function: def __init__(self,
                 group_key_start=1,
                 op_instance_key_start=100,
                 variable_instance_key_start=1000000):
      """Initializes the object.
  
      Args:
        group_key_start: the starting integer of group key.
        op_instance_key_start: the starting integer of instance key for ops.
        variable_instance_key_start: the starting integer of instance key for
          variables.
      """
      self._group_key = group_key_start
      self._group_key_table = {}
  
      assert op_instance_key_start != variable_instance_key_start
      self._op_instance_key_start = op_instance_key_start
      self._variable_instance_key = variable_instance_key_start
function_tokens: def __init__ ( self , group_key_start = 1 , op_instance_key_start = 100 , variable_instance_key_start = 1000000 ) : self . _group_key = group_key_start self . _group_key_table = { } assert op_instance_key_start != variable_instance_key_start self . _op_instance_key_start = op_instance_key_start self . _variable_instance_key = variable_instance_key_start