Hi Mathieu,
As per my understanding you are trying to build a neural network with multiple inputs (two different sequences) and facing an error while declaring two sequence input layers in the network.
A neural network in MATLAB cannot have two input layers in it. To build a neural network with multiple inputs, it is required to create the network architecture using "layerGraph" object.
Please refer to the documentation below to learn more about "layerGraph" object.
Please refer to the steps below for building a neural network with multiple sequence inputs: -
- Initially, define the main architecture of the neural network with "sequenceInputLayer" as input layer and other desired layers.
- Add a "concatenationLayer" in the network with the dimensions such that the second "sequenceInputLayer" can be connected to the main architecture later for another sequence input.
- Convert the network into Layer Graph.
- Create a "sequenceInputLayer" for sequence input and connect it to the second input of the "concatenationLayer".
Please refer to the pseudo code in the code snippet below: -
layers = [ ...
sequenceInputLayer(inputSize)
lstmLayer(numHiddenUnits,'OutputMode','last')
fullyConnectedLayer(numClasses)
softmaxLayer
classificationLayer]
lgraph = layerGraph(layers);
seqInput = sequenceInputLayer(inputSize);
lgraph = addLayers(lgraph,,'Name','seq');
lgraph = connectLayers(lgraph,"seq","cat/in2");
Please refer to the example in the documentation below to learn more about Training Neural Network with Multiple Inputs.
Hope it helps!
