- semfis - Mailing lists@ IFISC

Reminder: IFISC Seminar, TODAY - Tuesday, Mar 14, 2023 at 14:30
by semfis＠ifisc.uib-csic.es 14 Mar '23

14 Mar '23

IFISC Seminar on Tuesday Mar 14, 2023 at 14:30 Place: IFISC Seminar Room Title: In-memory Computing – Fundamentals, Current Trends, and Future Directions Speaker: Naresh R. Shanbhag, Department of Electrical & Computing Engineering, University of Illinois Abstract: In-memory computing (IMC) has emerged as an attractive complement to digital accelerators for enhancing the energy efficiency of machine learning tasks. IMC addresses the energy and latency costs of memory accesses dominating AI workloads by transforming the conventional memory accesses into one that computes functions of data in the memory core in an analog/mixed-signal manner. As a result, IMC chips have demonstrated &gt; 100X reduction in the energy-delay product over equivalent von Neumann architectures at iso-accuracy. IMCs also exhibit a fundamental energy vs. SNR trade-off that designers need to exploit to enhance energy efficiency while meeting task-level accuracy requirements. Since the publication of the concept in our ICASSP 2014 paper, IMC design has become an active area of research in the machine learning integrated circuits and architecture communities. This talk will describe IMC design principles, review current trends based on our recent efforts in extensive benchmarking (<a href="https://github.com/naresh-shanbhag/UIUC-IMC-Benchmarking"&g… style="color:#bad405">https://github.com/naresh-shanbhag/UIUC-…) and identify future opportunities and challenges in deploying IMCs at scale in emerging applications. Presential in the IFISC seminar room Zoom stream at: https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/in-memory-computing-fundamentals-current-trends-an/

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IFISC Seminar on Tuesday, Mar 14, 2023 at 14:30
by semfis＠ifisc.uib-csic.es 10 Mar '23

10 Mar '23

IFISC Seminar on Tuesday Mar 14, 2023 at 14:30 Place: IFISC Seminar Room Title: In-memory Computing – Fundamentals, Current Trends, and Future Directions Speaker: Naresh R. Shanbhag, Department of Electrical & Computing Engineering, University of Illinois Abstract: <div> <div> In-memory computing (IMC) has emerged as an attractive complement to digital accelerators for enhancing the energy efficiency of machine learning tasks. IMC addresses the energy and latency costs of memory accesses dominating AI workloads by transforming the conventional memory accesses into one that computes functions of data in the memory core in an analog/mixed-signal manner. As a result, IMC chips have demonstrated &gt; 100X reduction in the energy-delay product over equivalent von Neumann architectures at iso-accuracy. IMCs also exhibit a fundamental energy vs. SNR trade-off that designers need to exploit to enhance energy efficiency while meeting task-level accuracy requirements. Since the publication of the concept in our ICASSP 2014 paper,&nbsp; IMC design has become an active area of research in the machine learning integrated circuits and architecture communities. This talk will describe IMC design principles, review current trends based on our recent efforts in extensive benchmarking (<a class="moz-txt-link-freetext" href="https://github.com/naresh-shanbhag/UIUC-IMC-Benchmarking"&g…) and identify future opportunities and challenges in deploying IMCs at scale in emerging applications. Note that the seminar takes place on Tuesday, 14th March. &nbsp; Presential in the IFISC seminar room Zoom stream at: https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 </div> </div> Url event:https://ifisc.uib-csic.es/en/events/seminars/in-memory-computing-fundamentals-current-trends-an/

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Talk on Thursday, Mar 16, 2023 at 11:00
by semfis＠ifisc.uib-csic.es 10 Mar '23

10 Mar '23

Talk on Thursday Mar 16, 2023 at 11:00 Place: Zoom Seminar Title: Quantum trajectories of dissipative time-crystals Speaker: Albert Cabot, Institut für Theoretische Physik, Eberhard Karls Universität Tübingen Abstract: MdM Quantum Meeting Recent experiments with dense laser-driven atomic gases [G. Ferioli et&nbsp; al., arXiv:2207.10361 (2022)] have realized a many-body system which in the thermodynamic limit yields a so-called boundary time-crystal. This state of matter is stabilized by the competition between coherent driving and collective dissipation. The aforementioned experiment in principle allows to gain in situ information on the nonequilibrium dynamics of the system by observing the state of the output light field. We show that the photon count signal as well as the homodyne current allow to identify and characterize critical behavior at the time-crystal phase transition. At the transition point the dynamics of the emission signals feature slow drifts, which are interspersed with sudden strong fluctuations. We furthermore show that the time-integrated homodyne current can serve as a useful dynamical order parameter. From this perspective the time-crystal can be viewed as a state of matter in which different oscillation patterns coexist. This talk will be broadcasted (link to appear). Url event:https://ifisc.uib-csic.es/en/events/seminars/quantum-trajectories-of-dissipative-time-crystals/

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Reminder: IFISC Seminar, TODAY - Wednesday, Mar 08, 2023 at 14:30
by semfis＠ifisc.uib-csic.es 08 Mar '23

08 Mar '23

IFISC Seminar on Wednesday Mar 08, 2023 at 14:30 Place: IFISC Seminar Room Title: Word order theory. Swap distance minimization Speaker: Ramon Ferrer-i-Cancho , UPC Abstract: The syntactic structure of a sentence can be seen as a graph where vertices are words and edges indicate syntactic dependencies between words. Research on these structures has lead to the discovery of many statistical patterns. Some of them have been raised to the category of principles while others have been hypothesized to be manifestations of principles. In this talk, I will review this theoretical framework and delve into the order of four major constituents of a sentence, i.e. Subject, Verb, Object and Indirect Object, in large samples of languages to uncover the action of a recently introduced principle: swap distance minimization. According to that principle, word orders that differ by just one swap of adjacent constituents are easier to process than word orders that differ by the movement of constituents that are farther away. The setting is linguistic but the problem reduces to a space where points are distinct orderings of components and the distance between points is defined by a graph of swaps. I will sketch potential applications to biology. Presential in the IFISC seminar room Zoom stream at: https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/word-order-theory-swap-distance-minimization/

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IFISC Seminar on Wednesday, Mar 08, 2023 at 14:30
by semfis＠ifisc.uib-csic.es 03 Mar '23

03 Mar '23

IFISC Seminar on Wednesday Mar 08, 2023 at 14:30 Place: IFISC Seminar Room Title: Word order theory. Swap distance minimization Speaker: Ramon Ferrer-i-Cancho , UPC Abstract: The syntactic structure of a sentence can be seen as a graph where vertices are words and edges indicate syntactic dependencies between words. Research on these structures has lead to the discovery of many statistical patterns. Some of them have been raised to the category of principles while others have been hypothesized to be manifestations of principles. In this talk, I will review this theoretical framework and delve into the order of four major constituents of a sentence, i.e. Subject, Verb, Object and Indirect Object, in large samples of languages to uncover the action of a recently introduced principle: swap distance minimization. According to that principle, word orders that differ by just one swap of adjacent constituents are easier to process than word orders that differ by the movement of constituents that are farther away. The setting is linguistic but the problem reduces to a space where points are distinct orderings of components and the distance between po ints is defined by a graph of swaps. I will sketch potential applications to biology. Presential in the IFISC seminar room, Zoom stream at&nbsp;https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/word-order-theory-swap-distance-minimization/

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Reminder: PhD Thesis Defense, TODAY - Friday, Feb 24, 2023 at 11:00
by semfis＠ifisc.uib-csic.es 24 Feb '23

24 Feb '23

PhD Thesis Defense on Friday Feb 24, 2023 at 11:00 Place: IFISC Seminar Room Title: Characterization and simulation of multipartite open quantum systems Speaker: Marco Cattaneo, Algorithmiq (Helsinki, Finland), PhD student of UIB (IFISC) and the University of Helsinki Abstract: Motivated by renewed studies on dissipative collective effect and by new discoveries about the features of noise in quantum computers, the interest in multipartite open quantum systems has recently risen. A dissipative collective effect may be defined as the coherent interference of the emissions (and/or absorptions) of many quantum particles interacting with external environments. Multipartite open quantum systems are open systems made of multiple subsystems, which can interact with each other and at the same time may be coupled to local and/or collective environments. The characterization and simulation of the dynamics of multipartite open quantum systems is the topic of this doctoral dissertation. The thesis addresses methodological questions, phenomenological predictions, and also presents an experimental implementation on a quantum computer. These contributions include the description and characterization of a general master equation for Markovian multipartite open quantum systems, and some new procedures for the analog and digital quantum simulation thereof.&nbsp; Jury:&nbsp;Anna Sanpera (UAB, Spain),&nbsp;Paolo Muratore (University of Helsinki, Finland), John Goold (Trinity College Dublin, Ireland) Supervisors:&nbsp; S. Maniscalco, R. Zambrini, G.L. Giorgi, M.A.C. Rossi Presential in the&nbsp; IFISC seminar room with parallel Zoom stream at https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 &nbsp; &nbsp; Url event:https://ifisc.uib-csic.es/en/events/seminars/characterization-and-simulation-of-multipartite-op/

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Reminder: Talk, TODAY - Monday, Feb 20, 2023 at 15:00
by semfis＠ifisc.uib-csic.es 20 Feb '23

20 Feb '23

Talk on Monday Feb 20, 2023 at 15:00 Place: Zoom Seminar Title: Experimental investigation of a microring-based time-delay reservoir computing Speaker: Giovanni Donati, IFISC (CSIC-UIB) - University of Trento Abstract: Reservoir computing is a paradigm that simplifies the training of recurrent neural networks. Beyond reservoir computing algorithms simulated on conventional computers, many physical implementations have been realized, where the reservoir is either composed of many physical distinct nodes, or it is folded in the dynamics of only one single node. Here I will present an experimental realization of an optoelectronic reservoir computing system, folded in the dynamics of an integrated silicon microring resonator coupled to an external optical feedback. The performance of the network is evaluated on delayed digital tasks. Online-only&nbsp;seminar: https://uibuniversitat.zoom.us/j/87008849910 Url event:https://ifisc.uib-csic.es/en/events/seminars/experimental-investigation-of-a-microring-based-ti/

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Reminder: Talk, TODAY - Monday, Feb 20, 2023 at 11:00
by semfis＠ifisc.uib-csic.es 20 Feb '23

20 Feb '23

Talk on Monday Feb 20, 2023 at 11:00 Place: IFISC Seminar Room Title: Entropy estimators for Markovian systems Speaker: Juan I. Gregorio, IFISC (UIB-CSIC) Abstract: <pre> Estimating the entropy of short discrete sequences is an important problem with multiple applications in statistics, linguistics, ecology or neuroscience. Despite the multiple attempts to find an unbiased estimator with minimum mean squared error, the proposed estimators exhibit a performance that greatly vary depending on the type of system under study and the size of the available data. Further, most of the entropy estimators found in the literature assume that the data sequence is generated by independent events. Therefore, their range of applicability to correlated systems has thus far remained unexplored. To fill in this gap, we have analyzed the mostly used entropy estimators for i) binary Markovian sequences and ii) Markovian systems in the undersample regime. We carefully compare the performance of the estimators created for independent systems with a newly proposed entropy formula that takes into account the order of the sequence. We find that this new estimator performs well in terms of the bias but, in the undersample regime, its large dispersion is dominant. Presential in the IFISC seminar room, Zoom stream at: <a class="moz-txt-link-freetext" href="https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09">https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09</a></pre> &nbsp; Url event:https://ifisc.uib-csic.es/en/events/seminars/entropy-estimators-for-markovian-systems/

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Talk on Monday, Feb 20, 2023 at 11:00
by semfis＠ifisc.uib-csic.es 17 Feb '23

17 Feb '23

Talk on Monday Feb 20, 2023 at 11:00 Place: IFISC Seminar Room Title: Entropy estimators for Markovian systems Speaker: Juan I. Gregorio, IFISC (UIB-CSIC) Abstract: <pre> Estimating the entropy of short discrete sequences is an important problem with multiple applications in statistics, linguistics, ecology or neuroscience. Despite the multiple attempts to find an unbiased estimator with minimum mean squared error, the proposed estimators exhibit a performance that greatly vary depending on the type of system under study and the size of the available data. Further, most of the entropy estimators found in the literature assume that the data sequence is generated by independent events. Therefore, their range of applicability to correlated systems has thus far remained unexplored. To fill in this gap, we have analyzed the mostly used entropy estimators for i) binary Markovian sequences and ii) Markovian systems in the undersample regime. We carefully compare the performance of the estimators created for independent systems with a newly proposed entropy formula that takes into account the order of the sequence. We find that this new estimator performs well in terms of the bias but, in the undersample regime, its large dispersion is dominant. Presential in the IFISC seminar room, Zoom stream at: <a class="moz-txt-link-freetext" href="https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09">https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09</a></pre> &nbsp; Url event:https://ifisc.uib-csic.es/en/events/seminars/entropy-estimators-for-markovian-systems/

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Talk on Monday, Feb 20, 2023 at 15:00
by semfis＠ifisc.uib-csic.es 17 Feb '23

17 Feb '23

Talk on Monday Feb 20, 2023 at 15:00 Place: Zoom Seminar Title: Experimental investigation of a microring-based time-delay reservoir computing Speaker: Giovanni Donati, IFISC (CSIC-UIB) - University of Trento Abstract: Reservoir computing is a paradigm that simplifies the training of recurrent neural networks. Beyond reservoir computing algorithms simulated on conventional computers, many physical implementations have been realized, where the reservoir is either composed of many physical distinct nodes, or it is folded in the dynamics of only one single node. Here I will present an experimental realization of an optoelectronic reservoir computing system, folded in the dynamics of an integrated silicon microring resonator coupled to an external optical feedback. The performance of the network is evaluated on delayed digital tasks. Online-only&nbsp;seminar: https://uibuniversitat.zoom.us/j/87008849910 Url event:https://ifisc.uib-csic.es/en/events/seminars/experimental-investigation-of-a-microring-based-ti/

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