hi, I had not used pytorch for CNN training. I only employed Caffe.
LMDB did have some help, refer Jia Qingyang’s tip:   http://image-net.org/tutorials/cvpr2015/getting_started.pdf 109
In my training from stratch of VGG16 on imagenet, the top1 is only 52%, I’m still struggling on it.
As the training/validation accuracy gap, would you share the log file or the training loss - iteration plot so that we could have a sense of your problem?