- Convert DAGNetwork object to LayerGraph object
- Replace the last few layers
- Freeze bias/weight of initial layers (optional)
- Re-connect all the layers in the original order by using the support function createLgraphUsingConnections
Errors in transfer learning using resnet101
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I would like to use resnet101 to do transfer learning.
When I build the network and use the trainNetwork function as shown below, I get the following error. What is the cause?
Layer 'res2a': unconnected input. The input of each layer must be coupled with the output of another layer.
An unconnected input was detected:
net = resnet101;
layers = net.Layers;
layers = [
layers(1:344)
fullyConnectedLayer(Numberofclasses)
layers(346)
classificationLayer];
options = trainingOptions('sgdm',...
'MiniBatchSize',16,...
'InitialLearnRate', 0.0001, ...
...)
trainNetwork(TrainImage,TrainData,layers,options);
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Accepted Answer
Akira Agata
on 18 Mar 2021
Since ResNet-101 is imported as a DAGNetwork object, the following steps will be needed (more details can be found in this Link)
So the MATLAB code will be like this.
net = resnet101;
% 1. Convert DAGNetwork object to LayerGraph object
lgraph = layerGraph(net);
% 2. Replace the last few layers
lgraph = replaceLayer(lgraph,'fc1000',...
fullyConnectedLayer(Numberofclasses,'Name','fcNew'));
lgraph = replaceLayer(lgraph,'ClassificationLayer_predictions',...
classificationLayer('Name','ClassificationNew'));
% 4. Re-connect all the layers in the original order
% by using the support function createLgraphUsingConnections
layers = lgraph.Layers;
connections = lgraph.Connections;
lgraph = createLgraphUsingConnections(layers,connections);
% Train the network
options = trainingOptions('sgdm',...
'MiniBatchSize',16,...
'InitialLearnRate', 0.0001, ...
...)
net = trainNetwork(imdsTrain,lgraph,options);
3 Comments
baby
on 18 Feb 2022
I dont think its an error, its a warning but somehow it appears in red. You can ignore this and proceed with the training procedure, and to make sure you can use command:
analyzeNetwor(lgraph)
if found no error, the traning will process very nicely. ( I hope).
Tan
on 14 May 2023
hi although using the command
layers = lgraph.Layers;
connections = lgraph.Connections;
lgraph = createLgraphUsingConnections(layers,connections);
it also show the same error:
trainedNet = trainNetwork(augmentedTrainingSet,lgraph,options);
Error using trainNetwork
Invalid network.
Caused by:
Layer 'inception_3a-output': Unconnected input. Each layer input must be connected to the output of another
layer.
Layer 'inception_3b-output': Unconnected input. Each layer input must be connected to the output of another
layer.
Layer 'inception_4a-output': Unconnected input. Each layer input must be connected to the output of another
layer.
Layer 'inception_4b-output': Unconnected input. Each layer input must be connected to the output of another
layer.
Layer 'inception_4c-output': Unconnected input. Each layer input must be connected to the output of another
layer.
Layer 'inception_4d-output': Unconnected input. Each layer input must be connected to the output of another
layer.
Layer 'inception_4e-output': Unconnected input. Each layer input must be connected to the output of another
layer.
Layer 'inception_5a-output': Unconnected input. Each layer input must be connected to the output of another
layer.
Layer 'inception_5b-output': Unconnected input. Each layer input must be connected to the output of another
layer.
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