TypeError: Input 'b' of 'MatMul' Op has type float32 that does not match type float64 of argument 'a

显示，TypeError: Input ‘b’ of ‘MatMul’ Op has type float32 that does not match type float64 of argument 'a，这是由于两个相乘矩阵类型不匹配，调试一下发现x矩阵为tf.float64,W矩阵为tf.float32，改类型用tf.cast()函数，修改如下：

y = tf.matmul(tf.cast(x,tf.float32),W)