Fix generate function#322

Warvito merged 3 commits intomainProject-MONAI/GenerativeModels:mainfrom

320-issue-when-sampling-the-vqvae+transformer-from-2d_vqvae_transformer_tutorialProject-MONAI/GenerativeModels:320-issue-when-sampling-the-vqvae+transformer-from-2d_vqvae_transformer_tutorialCopy head branch name to clipboard