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Parameter Selection and Pre-Conditioning for a Graph Form Solver [article]

Christopher Fougner, Stephen Boyd
2015 arXiv   pre-print
In a recent paper, Parikh and Boyd describe a method for solving a convex optimization problem, where each iteration involves evaluating a proximal operator and projection onto a subspace. In this paper we address the critical practical issues of how to select the proximal parameter in each iteration, and how to scale the original problem variables, so as the achieve reliable practical performance. The resulting method has been implemented as an open-source software package called POGS
more » ... Graph Solver), that targets multi-core and GPU-based systems, and has been tested on a wide variety of practical problems. Numerical results show that POGS can solve very large problems (with, say, more than a billion coefficients in the data), to modest accuracy in a few tens of seconds. As just one example, a radiation treatment planning problem with around 100 million coefficients in the data can be solved in a few seconds, as compared to around one hour with an interior-point method.
arXiv:1503.08366v1 fatcat:quzaesfh5beiloej5mdqypgo5m

Parameter Selection and Preconditioning for a Graph Form Solver [chapter]

Christopher Fougner, Stephen Boyd
2018 Lecture Notes in Control and Information Sciences - Proceedings  
2 ij e u i +v j n1 T u m1 T v by (simple) coordinate minimization; take Dii a e u i =2 , Ejj a e v j =2 (recovers Sinkhorn-Knopp algorithm) Proximal Graph Solver (POGS) I developed by Chris Fougner  ... 
doi:10.1007/978-3-319-67068-3_4 fatcat:smoofxdh3zactmopucueq26ahq

Reducing Bias in Production Speech Models [article]

Eric Battenberg, Rewon Child, Adam Coates, Christopher Fougner, Yashesh Gaur, Jiaji Huang, Heewoo Jun, Ajay Kannan, Markus Kliegl, Atul Kumar, Hairong Liu, Vinay Rao, Sanjeev Satheesh (+3 others)
2017 arXiv   pre-print
Replacing hand-engineered pipelines with end-to-end deep learning systems has enabled strong results in applications like speech and object recognition. However, the causality and latency constraints of production systems put end-to-end speech models back into the underfitting regime and expose biases in the model that we show cannot be overcome by "scaling up", i.e., training bigger models on more data. In this work we systematically identify and address sources of bias, reducing error rates
more » ... up to 20% while remaining practical for deployment. We achieve this by utilizing improved neural architectures for streaming inference, solving optimization issues, and employing strategies that increase audio and label modelling versatility.
arXiv:1705.04400v1 fatcat:bkjxkwomprccddymmnapco3jny

Deep Speech 2: End-to-End Speech Recognition in English and Mandarin [article]

Dario Amodei, Rishita Anubhai, Eric Battenberg, Carl Case, Jared Casper, Bryan Catanzaro, Jingdong Chen, Mike Chrzanowski, Adam Coates, Greg Diamos, Erich Elsen, Jesse Engel (+21 others)
2015 arXiv   pre-print
We show that an end-to-end deep learning approach can be used to recognize either English or Mandarin Chinese speech--two vastly different languages. Because it replaces entire pipelines of hand-engineered components with neural networks, end-to-end learning allows us to handle a diverse variety of speech including noisy environments, accents and different languages. Key to our approach is our application of HPC techniques, resulting in a 7x speedup over our previous system. Because of this
more » ... ciency, experiments that previously took weeks now run in days. This enables us to iterate more quickly to identify superior architectures and algorithms. As a result, in several cases, our system is competitive with the transcription of human workers when benchmarked on standard datasets. Finally, using a technique called Batch Dispatch with GPUs in the data center, we show that our system can be inexpensively deployed in an online setting, delivering low latency when serving users at scale.
arXiv:1512.02595v1 fatcat:auol4dnoxrc5rmj2yrf2kxt5ya

Page 541 of American Society of Civil Engineers. Proceedings of the American Society of Civil Engineers Vol. 59, Issue 3 [page]

1933 American Society of Civil Engineers. Proceedings of the American Society of Civil Engineers  
Chapin Daggett Sverre Dahm louis Christian Datz Arthur Lincoln Davis Philip Hoffecker De Witt Boyd Ehle Arthur John Ela George Ezra Ellis Robert Lee Faris John Moyer Farley Henning Fernstrom Hermann Fougner  ...  Rowse Sumner Farnham Shaw Frank Woodward Skinner John Rodolph Slattery Charles Churchill Small Augustus Smith Francis Pitt Smith John Hammond Smith Theodore Nelson Spencer William Aiken Starrett Vernon Christopher  ... 

Page 342 of Hispania Vol. 41, Issue 3 [page]

1958 Hispania  
NEW YORK East Rockaway: HS: Carol Humphrey, Ruth Widman; Garpen Crtry: HS: Kari Fougner; Genoa: Central Sch.: Jeffrey Coulson; GLEN Cove: HS: Lin Marie Vorst; Jamaica: HS Barbara Robin; Jerrcuo: HS: Wallace  ...  Berliner, Richard Bobis, Judy Moss, Bayla Tulchin; Laurence: HS: Judith Azaria, Betty Kerr, Elsa Kepferberg; Mingora: HS: Marianne Monacci, Carol Olsen; Monticetto: HS: Edward Cooke; New York: Christopher  ... 

Page 411 of Peace Research Abstracts Journal Vol. 43, Issue 5 [page]

2006 Peace Research Abstracts Journal  
241224 Ferree, Karen E., 241366 Ferris, Maria S., 241593 Fey, Mark, 241394 Fleming, Jenny, 241579 Fogel, Sondra J., 241261 Follette, Victoria, 241525 Foot, Rosemary, 241338 Forero-Puerta, Tatiana, 241226 Fougner  ...  ., 241574 Almack, Kathryn, 241559 Altunisik, Meliha Benli, 241436 Amato, Sarah, 241433 Anderson, Christopher J., 241336 Anderson, Leslie E., 241357 Anderson, Simon P., 241292 Andres, Richard B., 241488  ... 

Page 261 of American Society of Civil Engineers. Proceedings of the American Society of Civil Engineers Vol. 66, Issue 4 [page]

1940 American Society of Civil Engineers. Proceedings of the American Society of Civil Engineers  
FOUGNER, NICOLAY KNUDTZON (As- soc. M. °13; M. ’18), Cons. Engr., Skog- brynet 4, Lilleaker, Oslo, Norway. FOUHY, MICHAEL AUGUSTIN (Assoc. M 719; M. ’26), Associate Civ.  ...  FOSTER, CHRISTOPHER JEROME (Jun. ’36), Civ. Engr., Frederick Snare Corpora- tion, 114 Liberty St., New York, N. Y. FOSTER, EDGAR EUGENE (Assoc. M. ’37), Associate Engr., U. S. Engr.  ... 

Page 187 of Journal of the American Institute of Architects Vol. 14, Issue 4 [page]

1926 Journal of the American Institute of Architects  
Poland, Hugh Roberts, Christopher M. Reinhardt, August J. Rahm, Marshall N. Shoemaker, Thomas Stephen, Oscar Schmidt, Victor H. Strombach, Wm. W. Slack, L. W. Slack, Howard A.  ...  Fougner, Frederick J. Griffin, Wm. S. Gregory, Ross E. Goddard, Charles A. Horton, T. Cecil Hughes, J. Osborne Hunt, J. Harman Harvey, David W. B. Haining, Warner H. Jones, Bernard E.  ... 

Summary of high field diffusion MRI and microscopy data demonstrate microstructural aberration in chronic mild stress rat brain

Ahmad Raza Khan, Andrey Chuhutin, Ove Wiborg, Christopher D Kroenke, Jens R. Nyengaard, Brian Hansen, Sune Nørhøj Jespersen
2016 Data in Brief  
Acknowledgments Lundbeck Foundation Grant R83-A7548 and Simon Fougner Hartmanns Familiefond. AC and BH acknowledge support from NIH 1R01EB012874-01.  ... 
doi:10.1016/j.dib.2016.06.061 pmid:27508246 pmcid:PMC4961219 fatcat:23p6q3co3rg35hkq3e3fqd2odm

SnapVX: A Network-Based Convex Optimization Solver [article]

David Hallac, Christopher Wong, Steven Diamond, Abhijit Sharang, Rok Sosic, Stephen Boyd, Jure Leskovec
2017 arXiv   pre-print
., 2000; Fougner and Boyd, 2015) . Scalability One of the biggest benefits of SnapVX is that it allows us to solve large problems very efficiently.  ... 
arXiv:1509.06397v2 fatcat:2jhx4pysbfg7nmskm5fnl2x4t4

SnapVX: A Network-Based Convex Optimization Solver

David Hallac, Christopher Wong, Steven Diamond, Abhijit Sharang, Rok Sosič, Stephen Boyd, Jure Leskovec
2017 Journal of machine learning research  
., 2000; Fougner and Boyd, 2015) . Scalability One of the biggest benefits of SnapVX is that it allows us to solve large problems very efficiently.  ... 
pmid:29599649 pmcid:PMC5870756 fatcat:sytnby2fsfgezgsowjs65xkcx4

Zeittafel zum Leben und Schaffen von Christopher Hansteen

Karin Reich, Elena Roussanova, Göttingen Academy Of Sciences
2017
Herausgeber sind Christopher Hansteen, Gregers Fougner Lundh (1786-1836) und Hans Henrik Maschmann (1775-1860); bis 1836 werden zwölf Bände herausgegeben 9.  ...  1812 Christopher Hansteen erhält den Preis der Königlich Dänischen Gesell- schaft der Wissenschaften zu Kopenhagen 15.  ... 
doi:10.26015/adwdocs-1360 fatcat:3edx7flapfh5lfdpixrlc7qgpe

Non-parametric regression modeling for stochastic optimization of power grid load forecast

Saahil Shenoy, Dimitry Gorinevsky, Stephen Boyd
2015 2015 American Control Conference (ACC)  
ACKNOWLEDGEMENT We wish to thank Christopher Fougner for his proximal operator graph solver and adaptive ρ updates that helped us produce the results of this paper.  ... 
doi:10.1109/acc.2015.7170865 dblp:conf/amcc/ShenoyGB15 fatcat:xdk6bhd6sfai5eizhdayloda7q

Litteratur mv [chapter]

Norsk ordre public som skranke for partsautonomi i internasjonale kontrakter  
arbeidsplikt, 2. utg., Universitetsforlaget 2016 Fougner, Jan mfl.  ...  Fougner, Jan, Lars Holo, Tron Løkken Sundet og Tarjei Thorkildsen Arbeidsmiljøloven: kommentarutgave, 2. utg., Universitetsfor- laget 2013 Fougner, Jan Endring i arbeidsforhold: styringsrett og  ... 
doi:10.18261/9788215027326201818 fatcat:zs454f74hzhl7cmcqgj4of4k2a
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