Events at Physics |
Events on Wednesday, January 27th, 2021
- Physics ∩ ML Seminar
- The Importance of Being Interpretable
- Time: 11:00 am
- Place: Online Seminar: Please sign up for our mailing list at www.physicsmeetsml.org for zoom link
- Speaker: Michelle Ntampaka, Space Telescope Science Institute
- Abstract: Cosmology is entering an era of data-driven science. Modern machine learning techniques are being combined with large astronomical surveys to enable powerful new research methods. This shift in our scientific approach requires us to ask an important question: Can we trust the black box? I will present a deep machine learning approach to constraining cosmological parameters with multi-wavelength observations of galaxy clusters. The ML approach has two components: an autoencoder that builds a compressed representation of each galaxy cluster and a flexible CNN to estimate the cosmological model from a cluster sample. From mock observations, the ML method estimates the amplitude of matter fluctuations, sigma8, at approximately the expected theoretical limit. More importantly, the deep ML approach can be understood and interpreted. I will lay out three schemes for interpreting the ML technique: a leave-one-out method for assessing cluster importance, an average saliency for evaluating feature importance, and correlations in the terse layer for understanding whether an ML technique can be safely applied to observational data. I will introduce the term “overspecialized" to describe a common pitfall in astronomical applications of machine learning in which the ML method learns simulation-specific details, and we show how a carefully sculpted architecture can be used to check for this source of systematic error.
- Host: Gary Shiu
- Department Meeting
- Time: 12:15 pm
- Place: Virtual see "abstract" for connection info
- Speaker: Sridhara Dasu, Department Chair
- AIMEE N LEFKOW is inviting you to a scheduled Zoom meeting.
Topic: Department Meeting
Time: Jan 13, 2021 12:15 PM Central Time (US and Canada)
Every week on Wed, until May 12, 2021, 18 occurrence(s)
Jan 13, 2021 12:15 PM
Jan 20, 2021 12:15 PM
Jan 27, 2021 12:15 PM
Feb 3, 2021 12:15 PM
Feb 10, 2021 12:15 PM
Feb 17, 2021 12:15 PM
Feb 24, 2021 12:15 PM
Mar 3, 2021 12:15 PM
Mar 10, 2021 12:15 PM
Mar 17, 2021 12:15 PM
Mar 24, 2021 12:15 PM
Mar 31, 2021 12:15 PM
Apr 7, 2021 12:15 PM
Apr 14, 2021 12:15 PM
Apr 21, 2021 12:15 PM
Apr 28, 2021 12:15 PM
May 5, 2021 12:15 PM
May 12, 2021 12:15 PM
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- Host: Sridhara Dasu
- NPAC (Nuclear/Particle/Astro/Cosmo) Forum
- Exploring Galaxy Evolution from Radio Observations
- Time: 4:00 pm
- Place: Virtual
- Speaker: Hansung Gim, Arizona State University
- Abstract: Zoom info
Meeting ID: 93592708053, passcode: cmbadger
Or click:
https://uwmadison.zoom.us/j/93592708053?pwd=VWVNMDJXV2N1blV0emg4ZUg3ZGRiUT09 - Host: Keith Bechtol