What is the merge mode of Bidirectional LSTM?

I'm using Bidirectional LSTM bilstmLayer from MATLAB but I cannot figure out which merge mode is used to combine the output of 2 element LSTM networks (concatenation, multiplication, average, or sum)

And is there anyway to change this mode?

Thank you!

Answer 1

[Raunak Gupta]

Hi,

The bilstmLayer uses concatenation mode as we can check by the number of activations generated by the layer in the output while creating a dummy network and running analyzeNetwork for it. Currently only this mode is supported for bilstmLayer.

[Thu Nguyen]

Thank you so much Raunak Gupta!