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Custom Vnet layer validation failed error

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Amira Youssef
Amira Youssef el 10 de Sept. de 2022
Comentada: Amira Youssef el 15 de Sept. de 2022
I am trying to train a custom Vnet network it keeps giving me the following error
Layer 'en3_prelu1': Layer validation failed. Error using
'predict' in Layer prelu3dLayer. The function threw an error
and could not be executed.
Array dimensions must match for binary array op.
This is my class definition
classdef prelu3dLayer < nnet.layer.Layer
% Custom 3-D PReLU layer.
% Copyright 2019 The MathWorks, Inc.
properties (Learnable)
% Layer learnable parameters
% Scaling coefficient
function layer = prelu3dLayer(numChannels, name)
% layer = preluLayer(numChannels, name) creates a PReLU layer
% with numChannels channels and specifies the layer name.
% Set layer name.
layer.Name = name;
% Set layer description.
layer.Description = "PReLU with " + num2str(numChannels) + " channels";
% Initialize scaling coefficient.
layer.Alpha = rand(numChannels);
function Z = predict(layer, X)
% Z = predict(layer, X) forwards the input data X through the
% layer and outputs the result Z.
Z = max(0, X) + layer.Alpha .* min(0, X);
function [dLdX, dLdAlpha] = backward(layer, X, ~, dLdZ, memory)
% [dLdX, dLdAlpha] = backward(layer, X, Z, dLdZ, memory)
% backward propagates the derivative of the loss function
% through the layer.
% Inputs:
% layer - Layer to backward propagate through
% X - Input data
% Z - Output of layer forward function
% dLdZ - Gradient propagated from the deeper layer
% memory - Memory value which can be used in backward
% propagation
% Outputs:
% dLdX - Derivative of the loss with respect to the
% input data
% dLdAlpha - Derivative of the loss with respect to the
% learnable parameter Alpha
dLdX = layer.Alpha .* dLdZ;
dLdX(X>0) = dLdZ(X>0);
dLdAlpha = min(0,X) .* dLdZ;
%dLdAlpha = sum(sum(dLdAlpha,1),2);
% Sum over all observations in mini-batch.
dLdAlpha = sum(dLdAlpha,5);
And these are the network options
inputSize = [40 40 40];
numClasses = 2;
lgraph = createVnetBn(inputSize, numClasses);
maxEpochs = 250;
options = trainingOptions('adam', ...
'MaxEpochs',maxEpochs, ...
'InitialLearnRate',1e-3, ...
'LearnRateSchedule','piecewise', ...
'LearnRateDropPeriod',5, ...
'LearnRateDropFactor',0.97, ...
'ValidationData',dsVal, ...
'ValidationFrequency',400, ...
'Plots','training-progress', ...
'Verbose',false, ...
doTraining = true;
if doTraining
modelDateTime = datestr(now,'dd-mmm-yyyy-HH-MM-SS');
[net,info] = trainNetwork(dsTrain,lgraph,options);
save(['trained3DUNet-' modelDateTime '-Epoch-' num2str(maxEpochs) '.mat'],'net');

Respuestas (1)

Amanjit Dulai
Amanjit Dulai el 11 de Sept. de 2022
It's tricky to tell without the code for createVnetBn, but I would guess the problem is this line in prelu3dLayer:
% Initialize scaling coefficient
layer.Alpha = rand(numChannels);
This will initialize layer.Alpha to a numChannels-by-numChannels matrix, which is not what you would normally want for a 3D input. For a 3D input, you probably want something like this:
% Initialize scaling coefficient
layer.Alpha = rand([1 1 1 numChannels]);
  7 comentarios
Amanjit Dulai
Amanjit Dulai el 15 de Sept. de 2022
I've attached an edited version of createVnetBn.m which should work for an input size of 40x40x40. I have removed one of the downsampling and upsampling stages.
Amira Youssef
Amira Youssef el 15 de Sept. de 2022
Thank you so much sir, I really can't thank you enough for this

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