python TypeError: Expected int32, got list containing Tensors of type '_Message' instead.

错误提示：

python TypeError: Expected int32, got list containing Tensors of type '_Message' instead.

错误原因：

tensorflow版本的问题：

tensorflow1.0及以后api定义：(数字在后，tensors在前)

tf.stack(tensors, axis=axis)

For example:

t1 = [[1, 2, 3], [4, 5, 6]]
t2 = [[7, 8, 9], [10, 11, 12]]
tf.concat([t1, t2], 0) ==> [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]
tf.concat([t1, t2], 1) ==> [[1, 2, 3, 7, 8, 9], [4, 5, 6, 10, 11, 12]]

# tensor t3 with shape [2, 3]
# tensor t4 with shape [2, 3]
tf.shape(tf.concat([t3, t4], 0)) ==> [4, 3]
tf.shape(tf.concat([t3, t4], 1)) ==> [2, 6]

tensorflow之前版本（0.x版本：数字在前，tensors在后）

For example:

t1 = [[1, 2, 3], [4, 5, 6]]
t2 = [[7, 8, 9], [10, 11, 12]]
tf.concat(0，[t1, t2], 0)
tf.concat(1，[t1, t2], 1)

解决方法：

调整tf.concat函数中参数位置，tensors在前，数字在后