4.5 Article

Multi-Timescale Memory Dynamics Extend Task Repertoire in a Reinforcement Learning Network With Attention-Gated Memory

期刊

出版社

FRONTIERS MEDIA SA
DOI: 10.3389/fncom.2018.00050

关键词

reinforcement learning; memory; attention; synaptic plasticity; eligibility trace; synaptic tagging

资金

  1. European Research Council (Multirules) [268689]
  2. Swiss National Science Foundation (Sinergia) [CRSII2_147636]
  3. European Commission Horizon 2020 Framework Program (H2020) (Human Brain Project) [720270]
  4. Swiss National Science Foundation (SNF) [CRSII2_147636] Funding Source: Swiss National Science Foundation (SNF)

向作者/读者索取更多资源

The interplay of reinforcement learning and memory is at the core of several recent neural network models, such as the Attention-Gated MEmory Tagging (AuGMEnT) model. While successful at various animal learning tasks, we find that the AuGMEnT network is unable to cope with some hierarchical tasks, where higher-level stimuli have to be maintained over a long time, while lower-level stimuli need to be remembered and forgotten over a shorter timescale. To overcome this limitation, we introduce a hybrid AuGMEnT, with leaky (or short-timescale) and non-leaky (or long-timescale) memory units, that allows the exchange of low-level information while maintaining high-level one. We test the performance of the hybrid AuGMEnT network on two cognitive reference tasks, sequence prediction and 12AX.

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