a neural network trainer for weebs diffusion models.

I got sick and tired of trying to trace execution through the arcane codepaths of existing Stable Diffusion trainers, so I wrote my own. This is based off the modeling/training code from @Stability-AI/generative-models, with significant modification for usability and readability.

Major changes from generative-models include:

• Architectural changes:
  • Migration to full PyTorch Lightning
  • LightningCLI trainer interface and configuration management (config file format is largely the same as generative-models, but with some minor differences in keywords)
  • Refactoring of some of the configuration code and model subclassing
  • "oops, all wandb" approach to logging (with some TensorBoard support as well)
• Trainer changes:
  • Use of PyTorch Lightning's Trainer class for training
  • Support for multiple GPUs (and multiple nodes, if you're into that)
  • Support for individual learning rates for the UNet and for each TE module
  • VAE training support! (kinda! discriminators are iffy but it works mostly)
• Module changes:
  • Rework of the ImageLogger to... sorta kinda work?
  • Adding support for Adafactor scheduler as well as the usual BitsAndBytes etc. ones
  • hey look tag frequency based loss scaling wonder where we got that one from 👀
  • Cleanup and refactoring of most modules to make them more readable and easier to trace execution
  • Probably more duplicated code than there really should be but here we are in this hell timeline
  • A huge pile of small changes too numerous to mention
• Dataset handling:
  • Support for Huggingface datasets (kinda! you're on your own but it should work if the keys match)
  • Shiny new ImageFolder datasets in "square", "square with captions", and "aspect-bucketed with captions" flavors
  • Support for custom datasets (see neurosis/dataset/ for examples)
  • Funny hybrid mongo+s3 dataset we're using for large-scale training (stop judging me, it works)
  • Support for custom data transform functions injected into the dataset pipeline¹

OK so first of all:

1. Do Not.

if you REALLY must, here:

git clone https://github.com/neggles/neurosis.git neurosis
cd neurosis
python3.10 -m venv .venv
source .venv/bin/activate
python -m pip install -U pip setuptools wheel setuptools-scm
python -m pip install -e '.[all]'

There is a docker container in GitHub packages, if you're feeling masochistic today.

Will also be throwing up Kubeflow manifest examples at some point (needs more testing)

I am once again asking,

1. Please, please just Do Not

but if the idea of arguing with my code and trying to figure shit out from incomplete outdated configuration templates sounds attractive to you, by all means:

python -m neurosis.trainer.cli --help

If you need more assistance than that, this code is probably not ready for you to use yet.

This will change as/if/when the code gets a bit more stable and usable.

My own code is GPLv3, see LICENSE.md

A significant amount of code is copied from from @Stability-AI/generative-models,which is MIT licensed and has been relicensed here under GPLv3 due to the extensive modifications.

Some code carries its own licenses (most notably LPIPS and Adafactor), see the appropriate SPDX identifiers and LICENSE files in the relevant files' directories.