Andrea Liu: How Materials Can Learn

Mon, Apr 25, 2022, 12:30 pm
Location: 
Joseph Henry Room, Jadwin Hall
Speaker(s): 
Sponsor(s): 
CPBF an NSF PFC

How does learning occur? Neural networks learn via optimization, where a loss function is minimized by a computer to achieve the desired result. But physical networks such as mechanical spring networks or flow networks have no central processor so they cannot minimize such a loss function. An alternative is to encode local rules into those networks so that they can evolve under external driving to develop function. For example, if the springs in a mechanical network have equilibrium lengths that grow if the springs are stretched, and shrink when the springs are compressed, the network will naturally evolve under applied stresses. I will describe how both of these strategies—global minimization of a loss function as well as training by local rules--can be used to teach systems how to perform functions inspired by biology, such as the ability of proteins (e.g. hemoglobin) to change their conformations upon binding of an atom (oxygen) or molecule, the ability of the brain’s vascular network to send enhanced blood flow and oxygen to specific areas of the brain associated with a given task, or the ability of the brain to perform classification.

Dimensionality and dynamics in networks of neurons

Fri, Jan 28, 2022, 11:00 am

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Location: Virtual event

Zvonimir Dogic: Sculpting liquid interfaces with active stresses

Mon, Feb 7, 2022, 12:30 pm

Controlling interfacial structure and dynamics of phase separating fluid mixtures is key to creating diverse functional materials.

Location: Zoom

Madhav Mani: A Statistical (Physics) view of Organismal Development

Mon, Feb 28, 2022, 12:30 pm

After a century of biochemical and genetic onslaught on the embryo we are left with an inexhaustive parts list with an increasingly baroque logic...

Location: Joseph Henry Room, Jadwin Hall

Na Ji: TBD

Mon, Mar 21, 2022, 12:30 pm
Location: Joseph Henry Room

Naama Brenner: TBD

Mon, Mar 21, 2022, 12:30 pm

Physics of Life - Students and Postdocs Edition

Fri, Mar 25, 2022, 11:00 am

More information coming soon!

Arnold Mathijssen: TBD

Mon, Mar 28, 2022, 12:30 pm
Location: Joseph Henry Room

Sarah L. Keller: TBD

Mon, Apr 4, 2022, 12:30 pm
Location: Joseph Henry Room, Jadwin Hall

Gijsje Koenderink: TBD

Mon, Apr 11, 2022, 12:30 pm
Location: Zoom

David Wolpert: TBD

Mon, Apr 18, 2022, 12:30 pm
Location: Joseph Henry Room, Jadwin Hall

Andrea Liu: How Materials Can Learn

Mon, Apr 25, 2022, 12:30 pm

How does learning occur? Neural networks learn via optimization, where a loss function is minimized by a computer to achieve the desired result....

Location: Joseph Henry Room, Jadwin Hall

Marc Gershow: TBD

Mon, May 2, 2022, 12:30 pm
Location: Joseph Henry Room, Jadwin Hall