code: def main_op():
      """Returns a main op to init variables and tables.
  
      Returns the main op including the group of ops that initializes all
      variables, initializes local variables and initialize all tables.
  
      Returns:
        The set of ops to be run as part of the main op upon the load operation.
      """
      init = variables.global_variables_initializer()
      init_local = variables.local_variables_initializer()
      init_tables = lookup_ops.tables_initializer()
      return control_flow_ops.group(init, init_local, init_tables)
  
imports: from tensorflow.python.framework import ops
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import lookup_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.util import deprecation
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 1 for calling a global function with example usage: main_op() and returns: control_flow_ops