Deep Learning Custom Layer learning parameters update

Question

Mathieu Chêne 2022-1-12

0
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https://ww2.mathworks.cn/matlabcentral/answers/1627410-deep-learning-custom-layer-learning-parameters-update

评论： Mathieu Chêne 2022-1-14

Hello,

I am working on a deep Learning project In which I try to classify data from a csv. I tryed to use a custom layer but when I train the network my Loss Function seems "constant" as if the weight is not updated.

Do you know what could be the reason of this behavior ?

I am sure of my dataset because when I use a fullyConnected Layer instead of my custom layer the training works perfectly and the testing gives me 100% accuracy.

I also give you the predict and the backward function from my custom layer where Weight is a learning parameter:

        function Z = predict(layer, X)
            % Z = predict(layer, X1, ..., Xn) forwards the input data X1,
            % ..., Xn through the layer and outputs the result Z.
            W = layer.Weights;
            numel=size(X,2);
            % Initialize output
            Z = zeros(layer.OutputSize,numel,"single");
            % Weighted addition
            for k=1:numel
                for j=1:layer.OutputSize
                    for i = 1:layer.InputSize
                        Z(j,k) = Z(j,k) + W(j,i)*X(i,k);
                    end
                end
            end
        end
       
        function [dLdX,dLdWeight]=backward(layer,X,~,dLdZ,~)
            %Initialization
            W=layer.Weights;
            dLdWeight=zeros(size(W),"single");
            dLdX=zeros(size(X),"single");
            %Backward operation
            for k=1:size(X,2)
                for j=1:layer.OutputSize
                    for i=1:layer.InputSize
                        dLdWeight(j,i)=dLdWeight(j,i)+X(i,k)*dLdZ(j,k);
                        dLdX(i,k)=dLdX(i,k)+W(j,i)*dLdZ(j,k);
                    end
                end
            end
        end
        