Release PR

Major Changes

• Python 3.7 Compatibility
• Adds CutMix Method
• New Pre-Fork DDP entrypoint
  • Change PR
  • composer Entrypoint for DDP forking prior to script start
  • Documentation on Usage

Minor Changes

• Lazy-Loading of dependencies
• General Docs updates for readability and correctness
• DDP Port auto-selection by default (no more conflicting ports upon reuse of trainer)
• Small bug fixes for YAHP inheritance

Notes

• Google Colab may have issues installing composer with !pip install mosaicml
  • Known workaround: Install through git with !pip install git+https://github.com/mosaicml/composer@main