Loss do not decrease. Unsuitable trainset?

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el

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Dec 23, 2015, 9:49:48 AM12/23/15
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Hello!
I have tried to finetune a pretrained model using a training set that has 20 classes. The important thing to mention is that even though I have 20 classes, one class consist the 1/3 of the training images. Is that a reason that my loss does not decrease and testing accuracy is almost 30%?

Thank you for any advise
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