如何在tensorflow中读取utf-8编码的二进制字符串？

import tensorflow as tf

def read_utf8_binary_string(filename):
    # 读取二进制文件
    file = tf.io.read_file(filename)
    # 解码为UTF-8字符串
    utf8_string = tf.strings.decode(file, 'utf-8')
    return utf8_string

utf8_string = read_utf8_binary_string('filename.bin')