Getting error when using semanticseg function

I am trying to use the semanticseg function to segment an image of dimensions 256x232x192 with a trained DAGnetwork. However I keep getting an error saying this:

"Error using gpuArray/cat. Maximum variable size allowed on the device is exceeded.

Error in nnet.internal.cnn.layer.Concatenation/predict (line 54)

Z = cat(this.ConcatenationAxis, X{:});

Error in nnet.internal.cnn.DAGNetwork/activations (line 571)

outputActivations = thisLayer.predict(XForThisLayer);

Error in DAGNetwork/calculateActivations (line 86)

YBatch = predictNetwork.activations({X}, layerIndex, layerOutputIndex);

Error in DAGNetwork/activations (line 138)

Y = this.calculateActivations(X, layerIndex, layerOutputIndex, varargin{:});

Error in semanticseg>iClassifyImagePixels (line 447)

allScores = activations(net, X, name, ...

Error in semanticseg (line 248)

[Lroi, scores, allScores] = iClassifyImagePixels(Iroi, net, params);"

My gpu has 24 GB of RAM, so it seems extremely unlikely that I am running out of memory running this, considering that the image gpuarray I am inputting is much less than 24 GB. I am able to input patches of [64 64 64] and [128 128 128] of the image succesfully and segment it, but I need to be able to input the whole image into the function as well. Is there a bug within the semanticseg function? How can I input the whole image into the semanticseg function? Thank you in advance!

[Walter Roberson]

It is not uncommon to start running out of memory when you have an array about 1/3 of the maximum memory of the GPU, and becomes quite likely when you have an array that exceeds half of the maximum memory of the GPU.

[Manusree Bhatter]

The array is less than 1 megabyte, it is nowhere near the maximum memory of the GPU. Could there be an issue with the semanticseg function itself?

Answer 1

[Harsha Priya Daggubati]

Hi,

The following thread might explain the reason behind the error you are getting:

https://www.mathworks.com/matlabcentral/answers/385273-why-do-i-get-maximum-variable-size-allowed-on-the-device-is-exceeded-error-when-running-the-sema