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How to use LSTM and CNN to handle a regression problem?

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Hui Li
Hui Li on 14 Jul 2020
Answered: H Sanchez on 30 Apr 2021
Hi, everyone!
I am working on a solar power prediction problem. The inputs of the network are some kinds of meteological data, and the outputs are multiple time-series solar power curves. I want to build a neural network combining LSTM and CNN to realize this function. I build a network without error like this:
layers1 = [...
sequenceInputLayer([25 168 1],'Name','input') % 25 is the number of feature dimension of meteological data, and 168 is the length of time series
sequenceFoldingLayer('Name','fold')
convolution2dLayer(5,1,'Padding','same','WeightsInitializer','he','BiasInitializer','zeros','Name','conv');
reluLayer('Name','relu')
sequenceUnfoldingLayer('Name','unfold')
flattenLayer('Name','flatten')
gruLayer(512,'OutputMode','sequence','Name','gru')
fullyConnectedLayer(25,'Name','fc2')
regressionLayer('Name','output')
];
lgraph = layerGraph(layers1);
lgraph = connectLayers(lgraph,'fold/miniBatchSize','unfold/miniBatchSize');
analyzeNetwork(lgraph);
However, the flattenLayer destory the time series, and the training cannot be finished.
Therefore, is there any solution about this problem? Or is there any other correct network can realize the same function?
Thanks in advance for your time and kindly help!

Answers (3)

Abolfazl Nejatian
Abolfazl Nejatian on 10 Dec 2020
Dear Gupta,
i have written a prediction code that uses CNNs and LSTM to forecast future values.
please visit my Mathworks page,
https://www.mathworks.com/matlabcentral/fileexchange/69506-time-series-prediction


Raunak Gupta
Raunak Gupta on 19 Jul 2020
Hi,
I am unable to understand what exactly you are doing with input and output of the network, but I think its related to either sequence to sequence regression or time series forecasting. You may follow below mentioned examples for both cases and see if it matches with your application.
  2 Comments
Raunak Gupta
Raunak Gupta on 19 Jul 2020
Hello,
I don't see any lstmLayer inside the Layer Graph, maybe you can add it. Also can you share a sample input and output with the code you trying with. It will help me recreating the problem and also checking if flattenLayer is indeed required or not.

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