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20/12/2018: Séminaire de Venkatramani Balaji

Venkatramani Balaji (Princeton University), lauréat de l'appel "Make our planet great again", donnera un séminaire sur le thème:
Quand ? Le 20/12/2018,
de 10:30 à 12:30
Où ? Salle de l'UFR 918 (T46-56, 2e étage)
S'adresser à
Téléphone 0144272799
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Machine learning and the post-Dennard era of climate simulation

Conventional computational hardware has reached some physical limits: the phenomenon known as 'Dennard scaling' gave rise to Moore's Law, and many cycles of exponential growth in computing capacity. The consequence is that we now anticipate a computing future of increased concurrency and slower arithmetic. Earth system models, which are weak-scaling and memory-bandwidth-bound, face a particular challenge given their complexity in physical-chemical-biological space, to which mapping single algorithms or approaches is not possible. A particular aspect of such 'multi-scale multi-physics' models that is under-appreciated is that they are built using a combination of local process-level and global system-level observational constraints, for which the calibration process itself remains a substantial computational challenge. In this talk, we examine approaches to Earth system modeling in the post-Dennard era. The possibilities include following the industry trend toward machine learning and build models that learn; stochastic methods and emulators for fast exploration of uncertainty; using fewer bits of precision, among others. The talk will present ideas and challenges and the future of Earth system models as we prepare for a post-Dennard future.

PS: Balaji redonnera son séminaire au LSCE