Error Message: Brace indexing is not supported for variables of this type. during TrainNetwork

Hello Community!

For my Master Thesis I'm currently training a neural network to classify fNIRS Data.

When I'm executing a single thread to check my code, everything works just fine. But when I wanted to run my entire program, Matlab threw an error:

Brace indexing is not supported for variables of this type.

What I'm trying to do is using spmd to spread the workload over 4 workers. The entire project includes multiple analyses, not just the Neural Net, and it's being separated by multiple test subjects, so multithreading is a viable solution.

A single thread is utilizing my GPU (GTX 980 Ti) at ~6% with ~1.2GB of VRAM usage (6GB available). So I thought enough rescources are available to train 4 networks in parallel.

Is that the issue? Does Matlab simply not allow to use multiple instances on a single device?

Best wishes

Answer 1

[Joss Knight]

You can definitely use your GPU on multiple MATLAB workers in an SPMD block. You should show your code, looks like you have a syntax error somewhere.