v1.2

API Updates:

• Add EMA support in Manager
• Add multiple devices support in training configs
• Display improvement during testing
• FP16 support
• Gradients accumulative support
• Introducing callbacks.SamplingCallback to sample images during training
• Introducing optim.EMAOptimizer for EMA optimizer with context control to swap parameters

Other Updates:

• Deprecated python 3.9
• Typing improvement