The key of Flow model is to design a invertible function with the following nice property: z 0 ∼ p 0 (z 0 ) z i = f i (z i-1 ) RNN ✓ GraphNVP Flow ✓ GCPN RL ✓ GraphAF Flow ✓ MoFlow Flow ✓ HierVAE VAE ✓ ✓ GraphEBM EBM GraphDF Flow ✓