如何在tensorflow2中创建这样的数据集：<预取数据集形状：(()，())，类型：(tf.string，tf.string)>

import tensorflow as tf

shape = ((), ())
dtype = (tf.string, tf.string)

data = [("数据1", "标签1"), ("数据2", "标签2"), ("数据3", "标签3")]

dataset = tf.data.Dataset.from_tensor_slices(data)

def map_fn(data, label):
    return tf.cast(data, dtype[0]), tf.cast(label, dtype[1])

dataset = dataset.map(map_fn)

dataset = dataset.prefetch(1)

for data, label in dataset:
    print(data.numpy(), label.numpy())