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Geometry Concept Learning

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Seminar✓ Recording AvailableNeuroscience

Geometry of concept learning

Haim Sompolinsky

The Hebrew University of Jerusalem and Harvard University

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Tuesday, January 3, 2023

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Tuesday, January 3, 2023

11:00 AM America/New_York

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Abstract

Understanding Human ability to learn novel concepts from just a few sensory experiences is a fundamental problem in cognitive neuroscience. I will describe a recent work with Ben Sorcher and Surya Ganguli (PNAS, October 2022) in which we propose a simple, biologically plausible, and mathematically tractable neural mechanism for few-shot learning of naturalistic concepts. We posit that the concepts that can be learned from few examples are defined by tightly circumscribed manifolds in the neural firing-rate space of higher-order sensory areas. Discrimination between novel concepts is performed by downstream neurons implementing ‘prototype’ decision rule, in which a test example is classified according to the nearest prototype constructed from the few training examples. We show that prototype few-shot learning achieves high few-shot learning accuracy on natural visual concepts using both macaque inferotemporal cortex representations and deep neural network (DNN) models of these representations. We develop a mathematical theory that links few-shot learning to the geometric properties of the neural concept manifolds and demonstrate its agreement with our numerical simulations across different DNNs as well as different layers. Intriguingly, we observe striking mismatches between the geometry of manifolds in intermediate stages of the primate visual pathway and in trained DNNs. Finally, we show that linguistic descriptors of visual concepts can be used to discriminate images belonging to novel concepts, without any prior visual experience of these concepts (a task known as ‘zero-shot’ learning), indicated a remarkable alignment of manifold representations of concepts in visual and language modalities. I will discuss ongoing effort to extend this work to other high level cognitive tasks.

Topics

concept learningdeep neural networksfew-shot learninggeometric propertiesmacaque inferotemporal cortexneural firing-rate spaceprototype decision rulevisual conceptszero-shot learning

About the Speaker

Haim Sompolinsky

The Hebrew University of Jerusalem and Harvard University

Contact & Resources

Personal Website

elsc.huji.ac.il/people-directory/faculty-members/haim-sompolinsky/

@HSompolinsky

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twitter.com/HSompolinsky

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