alaska2

https://www.kaggle.com/c/alaska2-image-steganalysis/overview

main ideas

• stacking of several models (b2, b3, b7)
• focall loss
• gradient accumulation
• label smoothing
• reduce lr on plateau
• balanced class sampler catalyst
• augmentations with flips (horizntal, vertical)

results:

• private LB: 107/1115 place top 10%, bronze medal