Adversarial Ranking for Language Generation

Generative adversarial networks (GANs) have great successes on synthesizing data. However, the existing GANs restrict the discriminator to be a binary classifier, and thus limit their learning capacity for tasks that need to synthesize output with rich structures such as natural language descriptions... In this paper, we propose a novel generative adversarial network, RankGAN, for generating high-quality language descriptions. Rather than training the discriminator to learn and assign absolute binary predicate for individual data sample, the proposed RankGAN is able to analyze and rank a collection of human-written and machine-written sentences by giving a reference group. By viewing a set of data samples collectively and evaluating their quality through relative ranking scores, the discriminator is able to make better assessment which in turn helps to learn a better generator. The proposed RankGAN is optimized through the policy gradient technique. Experimental results on multiple public datasets clearly demonstrate the effectiveness of the proposed approach. read more

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Results from the Paper

Task Dataset Model Metric Name Metric Value Global Rank Result Benchmark
Text Generation Chinese Poems RankGAN BLEU-2 0.812 # 1
Text Generation COCO Captions RankGAN BLEU-2 0.850 # 3
BLEU-3 0.672 # 4
BLEU-4 0.557 # 2
BLEU-5 0.544 # 3
Text Generation EMNLP2017 WMT RankGAN BLEU-2 0.778 # 4
BLEU-3 0.478 # 4
BLEU-4 0.411 # 4
BLEU-5 0.463 # 2


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