parameters: (module_name, function_name)
return_statement: return Function(vars(module)[function_name])
docstring: Import a function from an external module.
  
    Note that the `module_name` must be a module name
    that works with the usual import mechanisms. Shorthands
    like "tf.nn" will not work.
  
    Args:
        module_name: name of the module
        function_name: name of the function within the module
  
    Returns:
        Function-wrapped value of symbol.
docstring_summary: Import a function from an external module.
docstring_tokens: Import a function from an external module .
function: def External(module_name, function_name):
    """Import a function from an external module.
  
    Note that the `module_name` must be a module name
    that works with the usual import mechanisms. Shorthands
    like "tf.nn" will not work.
  
    Args:
        module_name: name of the module
        function_name: name of the function within the module
  
    Returns:
        Function-wrapped value of symbol.
    """
    module = importlib.import_module(module_name)
    return Function(vars(module)[function_name])
function_tokens: def External ( module_name , function_name ) : module = importlib . import_module ( module_name ) return Function ( vars ( module ) [ function_name ] )