Why the performance of neural network is bad with larger input?
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Hi,i create neural network for classification using nnstart.First i used an input with 9*222 matrix and i got this confusion matrix after training
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/164820/image.png)
Then i tried with input with a size of 9*989 but i got this confusion matrix
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/164821/image.png)
I want to know why the performance is bad with larger input?should i modify something because i tried to change the number in the hidden layer but it dosen't improve ? Please i need some help
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