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Log-Likelihood Ratio Minimizing Flows: Towards Robust and Quantifiable Neural Distribution Alignment
Ben Usman · Avneesh Sud · Nick Dufour · Kate Saenko

Thu Dec 10 09:00 AM -- 11:00 AM (PST) @ Poster Session 5 #1538

Distribution alignment has many applications in deep learning, including domain adaptation and unsupervised image-to-image translation. Most prior work on unsupervised distribution alignment relies either on minimizing simple non-parametric statistical distances such as maximum mean discrepancy or on adversarial alignment. However, the former fails to capture the structure of complex real-world distributions, while the latter is difficult to train and does not provide any universal convergence guarantees or automatic quantitative validation procedures. In this paper, we propose a new distribution alignment method based on a log-likelihood ratio statistic and normalizing flows. We show that, under certain assumptions, this combination yields a deep neural likelihood-based minimization objective that attains a known lower bound upon convergence. We experimentally verify that minimizing the resulting objective results in domain alignment that preserves the local structure of input domains.

Author Information

Ben Usman (Boston University, Google AI)
Avneesh Sud (Google)
Nick Dufour (Google Research)
Kate Saenko (Boston University & MIT-IBM Watson AI Lab, IBM Research)

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