How to input mask value to Convolution1D layer

Question

I need to feed variable length sequences into my model.

My model is Embedding + LSTM + Conv1d + Maxpooling + softmax.

When I set mask_zero =

Answer 1

The Masking layer expects every downstream layer to support masking, which is not the case of the Conv1D layer. Fortunately, there is another way to apply masking, using the Functional API:

inputs = Input(...)
mask = Masking().compute_mask(inputs) # <= Compute the mask
embed = Embedding(...)(inputs)
lstm = LSTM(...)(embed, mask=mask) # <= Apply the mask
conv = Conv1D(...)(lstm)
...
model = Model(inputs=[inputs], outputs=[...])