Challenge: Existing work on variableal autoencoders and waterstein autoencoding models has shown significant progress in open-domain response generation.
Approach: They propose to embed user-level and utterance-level information into two multimodal distributions and combine them into a mixed distribution.
Outcome: The proposed model outperforms state-of-the-art models on a large-scale real-world dataset.

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Challenge: Variational Autoencoders (VAE) are used to train generative models with latent variables.
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Implicit Deep Latent Variable Models for Text Generation (D19-1)

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Challenge: Variational auto-encoders have been used for text generation but their representation power is limited due to two reasons.
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Challenge: Latent variable models for text capture global semantic and syntactic features when trained correctly.
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Challenge: Variational autoencoders use a multivariate Gaussian latent variable to capture latent structure in data.
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