是否可以为python对象参数指定输入签名？

Question

例如：

@tf.function(input_signature=[
    PYTHON_SIGNATURE,
    tf.TensorSpec(
        shape=[None, None], 
        dtype=tf.float32)
])
def some_computation(python_object, tf_object):
   ... perform some computation involving python_object and tf_object.

我要用什么代替PYTHON_SIGNATURE？