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Why Are Conditional Generative Models Better Than Unconditional Ones?
Fan Bao · Chongxuan LI · Jiacheng Sun · Jun Zhu

@
in NeurIPS 2022 Workshop on Score-Based Methods »
Event URL: https://openreview.net/forum?id=sbDyvrvvKn7 »
Extensive empirical evidence demonstrates that conditional generative models are easier to train and perform better than unconditional ones by exploiting the labels of data. So do score-based diffusion models. In this paper, we analyze the phenomenon formally and identify that the key of conditional learning is to partition the data properly. Inspired by the analyses, we propose self-conditioned diffusion models (SCDM), which is trained conditioned on indices clustered by the $k$-means algorithm on the features extracted by a model pre-trained in a self-supervised manner. SCDM significantly improves the unconditional model across various datasets and achieves a record-breaking FID of 3.94 on ImageNet 64x64 without labels. Besides, SCDM achieves a slightly better FID than the corresponding conditional model on CIFAR10.

Author Information

Fan Bao (Tsinghua University)
Chongxuan LI (Renmin University of China)

Assistant Professor @ RUC

Jiacheng Sun (Huawei Technologies Co., Ltd)
Jun Zhu (Tsinghua University)

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