python - 张量数组 TensorArray_1_0 : Could not read from TensorArray index 0 because it has not yet been written to

Question

我不知道如何使用tensorarray。这是代码。这有什么问题？

import tensorflow as tf

aI=tf.TensorArray(tf.int32, 2)
aO=tf.TensorArray(tf.int32, 2)
aI=aI.unpack([[1,2],[1,2]])
def body(i,aI,aO):
    aO.write(i, aI.read(i)+1)
    return (i+1, aI, aO)
cond=lambda i, *_ : i<2
_, _, aO=tf.while_loop(cond, body, [0,aI,aO])
r=aO.pack()
with tf.Session() as sess:
    res=sess.run(r)
    print('done!')

Answer 1

我解决了。似乎在 while_loop 的 body 中，我们应该用 的返回值重新分配旧的 TensorArray aO >aO.write():

def body(i,aI,aO):
    aO=aO.write(i, aI.read(i)+1)
    return (i+1, aI, aO)

完整代码:

import tensorflow as tf

aI=tf.TensorArray(tf.int32, 2)
aO=tf.TensorArray(tf.int32, 2)
aI=aI.unpack([[1,2],[1,2]])
def body(i,aI,aO):
    aO=aO.write(i, aI.read(i)+1)
    return (i+1, aI, aO)
cond=lambda i, *_ : i<2
_, _, aO=tf.while_loop(cond, body, [0,aI,aO])
r=aO.pack()
with tf.Session() as sess:
    res=sess.run(r)
    print('done!')