Selecting neural network for a particular classification problem

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Akshay Joshi 2018-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/416360-selecting-neural-network-for-a-particular-classification-problem

关闭： MATLAB Answer Bot 2021-8-20

Hi,

I've been trying to fit a data with neural network, and optimizing the testing accuracy. The input feature space is 1,990 x 40,000 (1,990 is reduced feature space, further reduction is not possible) which I've to classify in one of the 25 classes.

The data plot (train and test) is as shown below:

The issue is training accuracy of network is pretty much good. But testing accuracy is not.

So far, I've tried:

Multi layer perceptrons (patternet) with:

Varying learning rate.
Varying number of layers (upto 8), with upto 200 neurons in each layer (further neuron increase causes overfitting).
Adding different regularization values.
Different training algorithms (traingdx, traingda, trainscg).