Chimera science

This watercolor depicts a chimera, monstrous fire-breathing creature. It appears that chimeras exist not only in Greek mythology. Learn more about my chimera-related work.




Who am I?

Recent Posts

10 Days Of Grad: Deep Learning From The First Principles. Neural networks is a topic that recurrently appears throughout my life. Once, when I was a BSc student, I got obsessed with the idea to build an “intelligent” machine1. I spent a couple of sleepless nights thinking. I read a few essays shedding some light on this philosophical subject, among which the most prominent, perhaps, stand Marvin Minsky’s writings2. As a result, I came across neural networks idea.

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Hello! An archive of old posts can be found here.

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My PhD

In three minutes

PhD thesis promo recorded on the regional final of "Ma thèse en 180" contest. The speech is in French, but it will take less than 180 seconds :)

Selected Publications

Photonic delay systems have revolutionized the hardware implementation of Recurrent Neural Networks and Reservoir Computing in particular. The fundamental principles of Reservoir Computing strongly benefit a realization in such complex analog systems. Especially delay systems, potentially providing large numbers of degrees of freedom even in simple architectures, can efficiently be exploited for information processing. The numerous demonstrations of their performance led to a revival of photonic Artificial Neural Network. Today, an astonishing variety of physical substrates, implementation techniques as well as network architectures based on this approach have been successfully employed. Important fundamental aspects of analog hardware Artificial Neural Networks have been investigated, and multiple high-performance applications have been demonstrated. Here, we introduce and explain the most relevant aspects of Artificial Neural Networks and delay systems, the seminal experimental demonstrations of Reservoir Computing in photonic delay systems, plus and the most recent and advanced realizations.
JAP, 2018

A chimera state is a rich and fascinating class of self-organized solutions developed in high-dimensional networks. Necessary features of the network for the emergence of such complex but structured motions are non-local and symmetry breaking coupling. An accurate understanding of chimera states is expected to bring important insights on deterministic mechanism occurring in many structurally similar high-dimensional dynamics such as living systems, brain operation principles and even turbulence in hydrodynamics. Here we report on a powerful and highly controllable experiment based on an optoelectronic delayed feedback applied to a wavelength tuneable semiconductor laser, with which a wide variety of chimera patterns can be accurately investigated and interpreted. We uncover a cascade of higher-order chimeras as a pattern transition from N to N+1 clusters of chaoticity. Finally, we follow visually, as the gain increases, how chimera state is gradually destroyed on the way to apparent turbulence-like system behaviour.
In Nat. Commun., 2015

Recent Publications

. Efficient Design of Hardware-Enabled Reservoir Computing in FPGAs. JAP, 2018.

Project

. Tutorial: Photonic Neural Networks in Delay Systems. JAP, 2018.

Project Publication

. Spatio-temporal complexity in dual delay nonlinear laser dynamics: chimeras and dissipative solitons. Chaos, 2018.

Preprint Project

. Laser chimeras as a paradigm for multistable patterns in complex systems. In Nat. Commun., 2015.

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Projects

Bioinspired computing

Bioinspired computing aims at producing more efficient hardware in terms of speed and energy consumption

Delay Differential Equations

A fast and flexible library solving delay differential equations.

HMEP

Multi expression programming is a genetic programming variant encoding multiple solutions in the same chromosome.