nice.py: NICE (Non-linear Independent Components Estimation, intro)
glow.py: Glow (Glow: Generative Flow with Invertible 1×1 Convolutions, intro)
32x32 celeba with level=3,depth=6
32x32 cifar10 with level=3,depth=6
f-VAEs.py: f-VAEs (f-VAEs: Improve VAEs with Conditional Flows , intro, arxiv)
测试环境包括：
- Keras 2.1.5 + tensorflow 1.2
- Keras 2.2.0 + tensorflow 1.8
- Keras 2.2.4 + tensorflow 1.13
均在Python 2.7下测试。
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