use lstm

[ancileddu]

Hello, thank you very much for your work. I need to use a level of lstm in workshops/extras/keras-bag-of-words/keras-bow-model.ipynb ..can you help me? I tried to insert
model.add(LSTM(activation='softmax', units=300, recurrent_activation='hard_sigmoid', return_sequences=True)) after the model.add(Dropout(0.5)) but i've the error: Input 0 is incompatible with layer lstm_1: expected ndim=3, found ndim=2
Sorry for my bad english.
Thank you very much. Bye