TypeError: loop of ufunc does not support argument 0 of type Tensor which has no callable sqrt met

使用tensorflow时出现的一错误

• 利用CNN预测时，计算均方根误差报错如下：

cross_entropy = np.sqrt(tf.reduce_mean(tf.reduce_sum(tf.square(ys - prediction), reduction_indices=[1])))

错误如下：
TypeError: loop of ufunc does not support argument 0 of type Tensor which has no callable sqrt met
原因应该是numpy要求输入的是矩阵，输入类型不对，改为：

cross_entropy = tf.sqrt(tf.reduce_mean(tf.reduce_sum(tf.square(ys - prediction), reduction_indices=[1])))

就可以了