How (not) to Train your Generative Model: Scheduled Sampling, Likelihood, Adversary?
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Abstract (arXiv)
Modern applications and progress in deep learning research have created renewed interest for generative models of text and of images. However, even today it is unclear what objective functions one should use to train and evaluate these models. In this paper we present two contributions. Firstly, we present a critique of scheduled sampling, a state-of-the-art training method that contributed to the winning entry to the MSCOCO image captioning benchmark in 2015. Here we show that despite this impressive empirical performance, the objective function underlying scheduled sampling is improper and leads to an inconsistent learning algorithm. Secondly, we revisit the problems that scheduled sampling was meant to address, and present an alternative interpretation. We argue that maximum likelihood is an inappropriate training objective when the end-goal is to generate natural-looking samples. We go on to derive an ideal objective function to use in this situation instead. We introduce a generalisation of adversarial training, and show how such method can interpolate between maximum likelihood training and our ideal training objective. To our knowledge this is the first theoretical analysis that explains why adversarial training tends to produce samples with higher perceived quality.
Key facts. Cited by 78 papers in the map (data through 14 Oct 2026). First posted on arXiv 16 Nov 2015.
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Citing papers per year: 2019: 1; 2020: 3; 2021: 18; 2022: 8; 2023: 20; 2024: 8; 2025: 5; 2026: 15.
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