Learning and Inference in Sparse Coding Models With Langevin Dynamics
Learning and Inference in Sparse Coding Models With Langevin Dynamics
复制标题
利用 Langevin Dynamics 进行稀疏编码模型的学习和推理
DOI:
10.1162/neco_a_01505
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发表时间:
2022
影响因子:
2.9
通讯作者:
Olshausen, Bruno A.
中科院分区:
文献类型:
--
作者:
Fang, Michael Y.-S.;Mudigonda, Mayur;Zarcone, Ryan;Khosrowshahi, Amir;Olshausen, Bruno A.
We describe a stochastic, dynamical system capable of inference and learning in a probabilistic latent variable model. The most challenging problem in such models—sampling the posterior distribution over latent variables—is proposed to be solved by harnessing natural sources of stochasticity inherent in electronic and neural systems. We demonstrate this idea for a sparse coding model by deriving a continuous-time equation for inferring its latent variables via Langevin dynamics. The model parameters are learned by simultaneously evolving according to another continuous-time equation, thus bypassing the need for digital accumulators or a global clock. Moreover, we show that Langevin dynamics lead to an efficient procedure for sampling from the posterior distribution in thesparse regime, where latent variables are encouraged to be set to zero as opposed to having a smallnorm. This allows the model to properly incorporate the notion of sparsity rather than having to resort to a relaxed version of sparsity to make optimization tractable. Simulations of the proposed dynamical system on both synthetic and natural image data sets demonstrate that the model is capable of probabilistically correct inference, enabling learning of the dictionary as well as parameters of the prior.
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DOI:
10.23919/cleo.2019.8749558
发表时间:
2018
期刊:
2019 Conference on Lasers and Electro-Optics (CLEO)
影响因子:
--
作者:
C. Roques;Yichen Shen;Cristian Zanoci;Mihika Prabhu;Fadi Atieh;Li Jing;T. Dubček;V. Ceperic;J. Joannopoulos;D. Englund;M. Soljačić
通讯作者:
M. Soljačić
DOI:
10.1364/josaa.20.001434
发表时间:
2003-07-01
影响因子:
1.9
作者:
Lee, TS;Mumford, D
通讯作者:
Mumford, D
影响因子:
38.3
作者:
Sheridan, Patrick M.;Cai, Fuxi;Lu, Wei D.
通讯作者:
Lu, Wei D.
DOI:
--
发表时间:
2007-12
期刊:
--
影响因子:
--
作者:
P. Berkes;Richard E. Turner;M. Sahani
通讯作者:
P. Berkes;Richard E. Turner;M. Sahani
DOI:
--
发表时间:
2019-08
期刊:
ArXiv
影响因子:
--
作者:
Wenlong Mou;Yian Ma;Yi-An Ma;M. Wainwright;P. Bartlett;Michael I. Jordan
通讯作者:
Wenlong Mou;Yian Ma;Yi-An Ma;M. Wainwright;P. Bartlett;Michael I. Jordan