Pytorch-ignite

Introduced Engine, Handlers and Metrics.

Metrics:
- BinaryAccuracy
- CategoricalAccuracy
- Loss
- Precision
- Recall
- etc

Handlers:
- ModelCheckpoint
- EarlyStopping
- Timer

Features:
- PyTorch 0.4 support

Examples:
- mnist.py
- mnist_with_tensorboardx.py
- mnist_with_visdom.py
- dcgan.py