helperImportMatConvNet error-- Undefined function or variable

I have an error running

 convnet = helperImportMatConvNet(cnnMatFile)

in the function DeepLearningImageClassificationExample which is an example provided by Matlab in their Documentation. The error says "Undefined function or variable 'helperImportMatConvNet'. I have neural network toolbox installed, but are running on a cpu. can you help with this please?

[Chan Yao Jun]

Hi may i know how you solve this problem?

thanks alot

Answer 1

[Diego Alcoceba Alvarez]

Hi everybody!

I had the same trouble with that example, at this line:

    convnet = helperImportMatConvNet(cnnFullMatFile)

So I found at the article Deep Learning for Computer Vision with MATLAB some code attached. The line which made the difference is:

    cnnFullMatFile = fullfile(cnnFolder, cnnMatFile);

Thus, I think the error wasn´t about the Matlab version or similar, it actually was that cnnFullMatFile was empty...

I hope this may help all of you!

Matlab R2017a. Computer Vision System Toolbox, version 7.3

[Lydia]

Thank you Diego! Your found works well! I was looking at the same webpage and had this error. Just for more clarification, the complete solution is this:

 %
% Specify folder for storing CNN model 
cnnFolder = 'C:\Users\Documents';
cnnMatFile = 'imagenet-caffe-alex.mat'; 
cnnFullMatFile = fullfile(cnnFolder, cnnMatFile);
%%Load Pre-trained CNN
% Load MatConvNet network into a SeriesNetwork
convnet = helperImportMatConvNet(cnnFullMatFile);
%%|convnet.Layers| defines the architecture of the CNN 
convnet.Layers

Now the error should not appear anymore.

Answer 2

[Eric Skaliks]

See the comments: "[...] using the helper function helperImportMatConvNet in the Computer Vision System Toolbox (TM)."

Answer 3

[Walter Roberson]

helperImportMatConvNet is part of the Computer Vision toolbox in R2016a. That demo requires R2016a or later to run.

[Chan Yao Jun]

would you mind to explain more about the helperImportMatConvNet? Is it a function in the Computer Vision toolbox? Cos i couldn't find information related to this function on internet.

[Walter Roberson]

It is an internal utility function not intended for public use, so it is not present in the main documentation.

It is part of Computer Vision Toolbox in R2016a, which is the release that introduced Convolutional Neural Networks. The demo is defined as being part of Computer Vision Toolbox, so it is not expected that you would be able to run the demo without Computer Vision Toolbox installed.

>> help helperImportMatConvNet
  Imports MatConvNet network into a SeriesNetwork object from the Neural
  Network Toolbox. This function is provided for educational purposes only
  and does not support all models from MatConvNet.

    This helper function uses internal functions, which may change in a
    future release. This function requires the Neural Network Toolbox.

References
----------
Vedaldi, Andrea, and Karel Lenc. "MatConvNet-convolutional neural
networks for MATLAB." arXiv preprint arXiv:1412.4564 (2014).

Answer 4

[eiman kattan]

any one found a solution for running this demo (pet detection using deep learning in mathwork document. i am also having error with running a function called helperImportMatConvNet??

any one can help

i am using for running the code giving in:

https://uk.mathworks.com/matlabcentral/fileexchange/57116-deep-learning-for-computer-vision-demo-code

Matlab 2016b which has the computer vision toolbox.

and the error is generated becous of this function helperImportMatConvNet??

[dimpy yadav]

Same problem. Do you know the solution now?

[Walter Roberson]

Are you using R2016a or later, and do you have the Computer Vision Toolbox installed (and licensed)? and do you have an NVIDIA GPU with CUDA 3.0 or later? If your NVIDIA GPU is the Pascal architecture, have you installed the Pascal patch?

Please post the output of

ver('vision')
license('test','Video_and_Image_Blockset')
opengl info