chainer 文档 RNN 教程在此页面中有不正确的代码: https ://docs.chainer.org/en/stable/tutorial/recurrentnet.html
def update_bptt(updater):
loss = 0
for i in range(35):
batch = train_iter.__next__()
x, t = chainer.dataset.concat_examples(batch)
loss += model(chainer.Variable(x), chainer.Variable(t))
model.cleargrads()
loss.backward()
loss.unchain_backward() # truncate
optimizer.update()
updater = training.StandardUpdater(train_iter, optimizer, **update_bptt**)
training.StandardUpdater 第三个参数是converter=concat_example,不是更新函数。如何准确地使用 trainer 编写 BPTT?