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SUMMARY:Computational Neuroscience Journal Club - Marine Schimel (CBL)\, G
 uillaume Hennequin (CBL)\, Alfonso Renart (Champalimaud)
DTSTART:20230328T130000Z
DTEND:20230328T150000Z
UID:TALK199075@talks.cam.ac.uk
CONTACT:Luke Johnston
DESCRIPTION:Please join us for our fortnightly Computational Neuroscience 
 journal club on Tuesday 28th March at 2pm UK time in the CBL seminar room\
 , or online on zoom. The title is ‘Linearly solvable control problems: f
 ormalism and application to decision making’\, presented by Marine Schim
 el and Guillaume Hennequin (CBL)\, with a guest presentation by Alfonso Re
 nart (Champalimaud) in the second half.\n\nZoom information: https://eng-c
 am.zoom.us/j/84204498431?pwd=Um1oU284b1YxWThObGw4ZU9XZitWdz09 Meeting ID: 
 842 0449 8431 Passcode: 684140\n\nSummary\nIn the mid 2000's\,  Bert Kappe
 n and Emo Todorov independently discovered a class of non-trivial control 
 problems for which the Bellman equation becomes linear. These problems ─
  which include both (discrete-time) Markov decision problems and  (continu
 ous-time) nonlinear diffusive dynamics ─ can therefore be solved very ef
 ficiently. The tractability of these ‘linearly solvable control’ probl
 ems has fostered advances in a variety of other domains\, including compos
 itional control\, risk-sensitive control\, inverse RL\,  and game-theory.\
 n\nMarine and Guillaume will give a 45 min overview of the ‘KL control
 ’ framework\, summarising the main derivation of the linearised Bellman 
 equation and going through several concrete examples. In the remaining 45 
 min\, Alfonso Renart will present his group's latest preprint where they e
 xtend these ideas to (i) formalise the cost of control incurred by an anim
 al having to modify its default behaviour\, and (ii) study the properties 
 of such control-limited behaviour. Their new framework ‘provides an orga
 nizing principle for how different task manipulations shape the phenomenol
 ogy of perceptual decision making\, including the nature and consequence o
 f decision lapses and sequential dependencies’.
LOCATION:In Person (CBL Seminar Room) and Online on Zoom
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