fastai

fastai is a layered API on top of PyTorch. It popularized Transfer Learning and good defaults (One Cycle Policy).

When to Use

• Learning DL: The best course/library for beginners ("Practical Deep Learning for Coders").
• Quick Baselines: Get state-of-the-art results in 5 lines of code.

Core Concepts

Defaults

fastai chooses the best learning rate finder, optimizer (AdamW), and augmentations for you.

Layered API

You can use the high-level Learner or peel back layers to raw PyTorch.