Error in Alexnet layer replacement

I ran the code trying to transfer Alexnet layer with reference to https://jp.mathworks.com/help/deeplearning/ug/transfer-learning-using-alexnet.html?lang=en

net = alexnet('Weights','none');
inputSize = net.Layers(1).InputSize;

However, the following error occurred.

Unrecognized method, property, or field 'Layers' for class 'nnet.cnn.layer.Layer'.
Error in test (line 2) inputSize = net.Layers(1).InputSize;

How can I resolve the error?

Answer 1

[Image Analyst]

Do you have the "Deep Learning Toolbox Model for AlexNet Network" installed? If not, use the Add-ons on the Home tab to get it.