34 lines
1.6 KiB
Markdown
34 lines
1.6 KiB
Markdown
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# Working with BYOL in DLAS
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[BYOL](https://arxiv.org/abs/2006.07733) is a technique for pretraining an arbitrary image processing
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neural network. It is built upon previous self-supervised architectures like SimCLR.
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BYOL in DLAS is adapted from an implementation written by [lucidrains](https://github.com/lucidrains/byol-pytorch).
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It is implemented via two wrappers:
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1. A Dataset wrapper that augments the LQ and HQ inputs from a typical DLAS dataset. Since differentiable
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augmentations don't actually matter for BYOL, it makes more sense (to me) to do this on the CPU at the
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dataset layer, so your GPU can focus on processing gradients.
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1. A model wrapper that attaches a small MLP to the end of your input network to produce a fixed
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size latent. This latent is used to produce the BYOL loss which trains the master weights from
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your network.
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Thanks to the excellent implementation from lucidrains, this wrapping process makes training your
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network on unsupervised datasets extremely easy.
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Note: My intent is to adapt BYOL for use on structured models - e.g. models that do *not* collapse
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the latent into a flat map. Stay tuned for that..
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# Training BYOL
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In this directory, you will find a sample training config for training BYOL on DIV2K. You will
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likely want to insert your own model architecture first. Exchange out spinenet for your
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model architecture and change the `hidden_layer` parameter to a layer from your network
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that you want the BYOL model wrapper to hook into.
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*hint: Your network architecture (including layer names) is printed out when running train.py
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against your network.*
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Run the trainer by:
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`python train.py -opt train_div2k_byol.yml`
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