Error with CNN and LSTM network

Good day,

I am attempting to do a combined cnn and lstm network with the following layers:

tempLayers = [

sequenceInputLayer(InputSize,"Name","sequence")

sequenceFoldingLayer("Name","seqfold")];

lgraph = addLayers(lgraph,tempLayers);

tempLayers = [

% Layer 1: 3 filters, stride of 1, length of filter is 102, no padding.

convolution2dLayer([40 1],32,'Stride',1,"Name","conv_1")

batchNormalizationLayer("Name","batchnorm_1")

leakyReluLayer("Name","relu_1")

maxPooling2dLayer([4 1],'Padding',"same","Name","maxpool_1")

dropoutLayer(0.1,"Name","dropout_1")

convolution2dLayer([40 1],32,'Stride',1,"Name","conv_2")

batchNormalizationLayer("Name","batchnorm_2")

leakyReluLayer("Name","relu_2")

maxPooling2dLayer([4 1],'Padding',"same","Name","maxpool_2")

dropoutLayer(0.1,"Name","dropout_2")];

lgraph = addLayers(lgraph,tempLayers);

tempLayers = [

sequenceUnfoldingLayer("Name","sequnfold")

flattenLayer("Name","flatten")

lstmLayer(128,"Name","lstm_1","OutputMode","last")

lstmLayer(128,"Name","lstm_2","OutputMode","last")

fullyConnectedLayer(1,"Name","fc")

%softmaxLayer("Name","softmaxlayer")

%classificationLayer("Name","classificationoutput")

regressionLayer("Name","regressionoutput")

];

lgraph = addLayers(lgraph,tempLayers);

%% Connect Layer Branches

clear tempLayers;

lgraph = connectLayers(lgraph,"seqfold/out","conv_1");

lgraph = connectLayers(lgraph,"seqfold/miniBatchSize","sequnfold/miniBatchSize");

lgraph = connectLayers(lgraph,"dropout_2","sequnfold/in");

However when i try to train the network using a train input that is a 4d double and output that is a 200 column vector with hr data i receive the following error:

"Error using trainNetwork (line 183)

Invalid training data. For a recurrent layer with output mode 'last', inputs must be cell arrays.

Error in ecng_6700_cw1_hw4_test_codem (line 235)

net = trainNetwork(train_input,estimator_train_output,lgraph,opts);"

I am unsure what the issue is with my data in trying to train it.

[James Lu]

have you tried changing the first LSTM layer to

lstmLayer(128,"Name","lstm_1","OutputMode","sequence")

Answer 1

[yanqi liu]

yes，sir，as James Lu idea，may be use

tempLayers = [

sequenceUnfoldingLayer("Name","sequnfold")

flattenLayer("Name","flatten")

lstmLayer(128,"Name","lstm_1","OutputMode","sequence")

lstmLayer(128,"Name","lstm_2","OutputMode","sequence")

fullyConnectedLayer(1,"Name","fc")

%softmaxLayer("Name","softmaxlayer")

%classificationLayer("Name","classificationoutput")

regressionLayer("Name","regressionoutput")

];

or make data to cells，such as

[XTrain,YTrain] = japaneseVowelsTrainData;
XTrain

XTrain = 270×1 cell array
    {12×20 double}
    {12×26 double}
    {12×22 double}
    {12×20 double}
    {12×21 double}
    {12×23 double}
    {12×22 double}
    {12×18 double}
    {12×24 double}
    {12×15 double}
    {12×23 double}
    {12×15 double}
    {12×17 double}
    {12×14 double}
    {12×14 double}
    {12×15 double}

now we can see the cell data,then you can use origin net layers to try