Rationale behind using stacked LSTM

[vrindaprabhu]

Hello,

I apologise initially if this is not the right forum to ask this question. But I believe since you were able to get good results, I thought you will be able to help me out!

I just have a confusion in understanding why the architecture involves stacked LSTMs. It is not very clearly explained in the paper (or I might have missed the finer details ). Since the inputs are just pad, I do not see any reason for the LSTM stacked layer. Request to point me in right direction to eliminate this ambiguity.

Thanks!