Why my net's blobs are zero after several iterations?

[Becky Bai]

Why my net's blobs are zero after several iterations?

I'm doing a 10-classification task. Use the cifar10 tutorial net.I put the data bewteen 0~255. Then I subtract the mean value.  My sample is a n*1*33*2500 matrix 

However, after 100 iterations, I find that the testing accuracy is 10%, then I check my net,

" net.blobs['conv2'].data"

 only to find that they are almost all "zero"

I've try many different ways like " normalize the data...",that doesn't work. I don't have much experience on this. I'll be very appreciate if you could give me some suggestions.