question: How to use pytorch-lightning distributed training without SLURM?
context: ❓How to use pytorch-lightning distributed training without SLURM?
  Couldn't find anywhere a single note or tutorial on this.
  For example I have just 2 node with 4 GPUs on each.
  On each node environment variables required for Pytorch distributed communication are configured (see pytorch documentation).
  Is this possible to train pytorch-lightning script in this setup and if so how?
answer: you can configure your own environment variables and do your own setup.
  Just override LightningModule.init_ddp_connection
  https://pytorch-lightning.readthedocs.io/en/latest/lightning-module.html#lightningmodule-class
  (corrected)