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If you installed cuDNN properly, it should be using cuDNN either with LeNet or with AlexNet.
This concerns me:
"I wanted to try the same dataset on the AlexNet, "
The lenet configuration is a 28x28 input, which is appropriate for a 32x32 mnist training set. If you try to use the same dataset with the AlexNet model, I think you’re going to have trouble. Isn’t the AlexNet model set up for a 256x256 data set?
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