We start defining our architecture by fixing some parameters such as the number of features considered by the GloVe embeddings, the number and length of filters, the length of maxpools, and the learning rate:
max_features = 200000 filter_length = 5 nb_filter = 64 pool_length = 4 learning_rate = 0.001
Managing to grasp the different semantic meanings of less or more different phrases in order to spot possible duplicated questions is indeed a hard task that requires a complex architecture. For this purpose, after various experimentation, we create a deeper model consisting of LSTM, time-distributed dense layers, and 1d-cnn. Such a model has six heads, which are merged into one by concatenation. After concatenation, the architecture is completed by five dense layers and an output layer with sigmoid activation.
The full model is shown in the following...
