title: what is the principle of readout and teacher forcing?
body: <p>These days I study something about RNN and teacher forcing. But there is one point that I can't figure out. What is the principle of readout and teacher forcing? How can we feeding the output(or ground truth) of RNN from the previous time step back to the current time step, by using the output as features together with the input of this step, or using the output as this step's cell state? I have read some paper but still it confused me.o(╯□╰)o. Hoping someone can answer for me。</p>