计算多项式时出现错误：“期望单个张量时的张量列表”

import tensorflow as tf

# 示例张量
tensor_list = [tf.constant(1.0), tf.constant(2.0), tf.constant(3.0)]

# 将张量列表转换为单个张量
tensor = tf.concat(tensor_list, axis=0)

# 计算多项式
polynomial_result = tensor ** 2 + tensor + 1

print(polynomial_result)