Thursday, October 10, 2019

Deep Compressed Sensing -implementation-

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As promised back in May, the implementation of the Deep Compressed Sensing paper is now available.
Hi,
Thank you for your interest and your wait. Now the code accompanying our ICML paper is available at: https://github.com/deepmind/deepmind-research/tree/master/cs_gan
Best wishes,
Yan


Compressed sensing (CS) provides an elegant framework for recovering sparse signals from compressed measurements. For example, CS can exploit the structure of natural images and recover an image from only a few random measurements. CS is flexible and data efficient, but its application has been restricted by the strong assumption of sparsity and costly reconstruction process. A recent approach that combines CS with neural network generators has removed the constraint of sparsity, but reconstruction remains slow. Here we propose a novel framework that significantly improves both the performance and speed of signal recovery by jointly training a generator and the optimisation process for reconstruction via meta-learning. We explore training the measurements with different objectives, and derive a family of models based on minimising measurement errors. We show that Generative Adversarial Nets (GANs) can be viewed as a special case in this family of models. Borrowing insights from the CS perspective, we develop a novel way of improving GANs using gradient information from the discriminator.
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Wednesday, October 09, 2019

Bayesian Inference with Generative Adversarial Network Priors

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Dhruv let me know of the following

Hi Igor,
I hope you're doing well. Thanks for posting latest articles and relevant information on your blog. I'm a regular reader of it and really enjoy it.
Just wanted to share with you one of our recent work on Bayesian inference using Generative Adversarial Network priors (https://arxiv.org/abs/1907.09987). In the paper, we demonstrate the effectiveness of this approach (in learning better priors and efficient posterior sampling) for a physics-based inverse problem, but I think similar idea can be applied to compressive sensing and any other inverse problems and uncertainty quantification task. So, I thought it might be of interest to your community and thought of sharing with you just in case if you would like to share it.

Best,
Dhruv

Thanks Dhruv !




Bayesian inference is used extensively to infer and to quantify the uncertainty in a field of interest from a measurement of a related field when the two are linked by a physical model. Despite its many applications, Bayesian inference faces challenges when inferring fields that have discrete representations of large dimension, and/or have prior distributions that are difficult to represent mathematically. In this manuscript we consider the use of Generative Adversarial Networks (GANs) in addressing these challenges. A GAN is a type of deep neural network equipped with the ability to learn the distribution implied by multiple samples of a given field. Once trained on these samples, the generator component of a GAN maps the iid components of a low-dimensional latent vector to an approximation of the distribution of the field of interest. In this work we demonstrate how this approximate distribution may be used as a prior in a Bayesian update, and how it addresses the challenges associated with characterizing complex prior distributions and the large dimension of the inferred field. We demonstrate the efficacy of this approach by applying it to the problem of inferring and quantifying uncertainty in the initial temperature field in a heat conduction problem from a noisy measurement of the temperature at later time.

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Tuesday, September 03, 2019

Nuit Blanche in Review (July-August 2019)

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Landing in Oxia Planum, NASA/JPL/University of Arizona


Since the last Nuit Blanche in Review (June 2019), we've have a few in-depth material, two posts about LightOn, a hardware implementation, some conferences, courses and some job announcements. Enjoy !

In-depth:
LightOn
CS Hardware:
Conferences:
Courses:
Jobs:


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Tuesday, August 27, 2019

PRAIRIE AI Summer School, Paris, October 3-5th 2019

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Julien just sent me the following:

Bonjour Igor, 
I would like to advertise the following event, which should be of interest for the readers of Nuit Blanche: https://project.inria.fr/paiss/This is an AI summer school located in Paris, which will take place from October 3 to 5th. (Application deadline is September 6th). The speakers will be

Sure, Julien ! Here is the page.




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Monday, August 26, 2019

LightOn’s Summer Blog Post Series:  Faith No Moore and A New Hope

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Here are two installments of our Summer series on what we do at LightOn. These two first blog posts provide some context about why we think there is a need for our technology. All this in the context of this past week's announcements by Intel that is releasing its 10nm chip (more here), Cerebras' announcement of its 15kW, trillion transistor chip or Habana's Gaudi chip.








We are expecting two more blog posts, please follow us on Medium.

Both posts were written by Julien Launay a Machine Learning R&D engineer at LightOn AI Research.


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Tuesday, August 20, 2019

Transfer Learning as a Tool for Reducing Simulation Bias: Application to Inertial Confinement Fusion

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Using Transfer learning for exploration purposes in expensive Inertial Confinement Fusion experiments is probably the only way to speed up our exploration of the right parameters in this nuclear fusion quest. 




Transfer Learning as a Tool for Reducing Simulation Bias: Application to Inertial Confinement Fusion. by B. Kustowski , Jim A. Gaffney , Brian K. Spears , Gemma J. Anderson , Jayaraman Jayaraman Thiagarajan , and Rushil Anirudh

We adapt a technique, known in the machine learning community as transfer learning, to reduce the bias of a computer simulation using very sparse experimental data. Unlike the Bayesian calibration, which is commonly used to estimate the simulation bias, transfer learning involves calculating an artificial neural network surrogate model of the simulations. Assuming that the simulation code correctly predicts trends in the experimental data but it is subject to unknown biases, we then partially retrain, or transfer learn, the initial surrogate model to match the experimental data. This process eliminates the bias while still taking advantage of the physics relations learned from the simulation. Transfer learning can be easily adapted to a wide range of problems in science and engineering. In this paper, we carry out numerical tests to investigate the applicability of this technique to predict inertial confinement fusion experiments under new conditions. Using our synthetic validation data set we demonstrate that an accurate predictive model can be built by retraining an initial surrogate model with experimental data volumes so small that they are relevant to the inertial confinement fusion problem. This opens up new opportunities for knowledge transfer and building predictive models in physics. After implementing transfer learning in a standard neural network, we successfully extended the method to a more complex, generative adversarial network architecture, which will be needed for predicting not only scalars but also diagnostic images in our future work.



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Monday, August 19, 2019

Enhanced Seismic Imaging with Predictive Neural Networks for Geophysics

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This week, we will look into how some inverse problems. 




We propose a predictive neural network architecture that can be utilized to update reference velocity models as inputs to full waveform inversion. Deep learning models are explored to augment velocity model building workflows during 3D seismic volume reprocessing in salt-prone environments. Specifically, a neural network architecture, with 3D convolutional, de-convolutional layers, and 3D max-pooling, is designed to take standard amplitude 3D seismic volumes as an input. Enhanced data augmentations through generative adversarial networks and a weighted loss function enable the network to train with few sparsely annotated slices. Batch normalization is also applied for faster convergence. Moreover, a 3D probability cube for salt bodies is generated through ensembles of predictions from multiple models in order to reduce variance. Velocity models inferred from the proposed networks provide opportunities for FWI forward models to converge faster with an initial condition closer to the true model. In each iteration step, the probability cubes of salt bodies inferred from the proposed networks can be used as a regularization term in FWI forward modelling, which may result in an improved velocity model estimation while the output of seismic migration can be utilized as an input of the 3D neural network for subsequent iterations.






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Friday, August 16, 2019

Job: Several postdocs, Ground Breaking Deep Learning Technology for Monitoring the Brain during Surgery with Commercialization Opportunity, University of Pittsburgh

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Kayhan just sent me the following:

Dear Igor,

I hope you are doing well.

I don't know if you remember me but we have been in contact a few times while I was a Ph.D. student at UPenn.

My lab at the University of Pittsburgh has several postdoc positions open. More specifically, I would be thankful if you could advertise this position (Link: https://kayhan.dbmi.pitt.edu/sites/default/files/JobAd.pdf) to your audience.

Best,
Kayhan

Sure Kayhan, I remember! Here is the announcement:
Ground Breaking Deep Learning Technology for Monitoring the Brain during Surgery with Commercialization Opportunity 

We are developing a clinical tool based on deep learning to automatically detect stroke during surgery and alert the surgical team to avert complications and save lives. We are uniquely positioned at the intersection of the largest health care system in the US, the University of Pittsburgh Medical Center (UPMC), and top ranked academic institutions, the University of Pittsburgh (Pitt) and the Carnegie Mellon University (CMU). Our group consists of Pitt and UPMC faculty members who have complementary expertise in machine learning and in healthcare and specifically in deep learning, clinical informatics, neurology, and surgery. We develop novel deep learning and other machine learning methods for application to challenging clinical problems. We are very well funded by NIH, NSF, industry, and internal institutional grants.  
In the current project, we are developing a clinical tool that will automatically detect stroke and other adverse events during surgery from an array of monitoring information, and provide highly accurate real time alerts to the surgical team to make course corrections during surgery. The clinical tool is to be deployed in operating rooms for monitoring surgeries and providing high quality alerts.
The successful candidate will work with us in a highly collaborative environment that spans the computer laboratory and the operating room and will gain unique and valuable experience in deep learning, development of a tool for a clinical setting, and in commercialization.  
Expected qualifications Genuinely motivated to develop and apply machine learning to clinical problems. Strong expertise in machine learning is required; expertise in statistics and experience with messy clinical data is a plus. Python fluency is required. Demonstrated ability to make meaningful contributions to projects with a research flavor is valuable.  
Experience/Abilities
• Hands-on experience building predictive models
• Experience working with diverse data types including signal and structured data; experience with text data is a plus
• Experience in programming in Python; experience in additional languages (R, C/C++) is a plus
• Aware of current best practices in machine learning
• Fluency in one of the deep learning frameworks is a plus (PyTorch or Tensorflow)
• Knowledge of statistics, including hypothesis testing with parametric and non-parametric tests and basic probability
• PhD in computer science, electrical engineering, statistics or equivalent computational / quantitative fields (exceptional MS candidates will be considered)  
The goal of this project is to develop, evaluate and commercialize a tool for automatic detection of stroke during surgery. The successful candidate will have the rare opportunity to perform cutting-edge deep learning research and participate in a commercial endeavor.  
If interested, contact Shyam Visweswaran, MD, PhD at shv3@pitt.edu and Kayhan Batmanghelich, PhD at kayhan@pitt.edu. For details of ongoing research work, visit http://www.thevislab.com/ and https://kayhan.dbmi.pitt.edu/. The University of Pittsburgh is an Affirmative Action/Equal Opportunity Employer and values equality of opportunity, human dignity, and diversity. 


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Jobs: PhD scholarship on Algorithms for Event-Driven Camera Analysis at Western Sydney University, Australia

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Paul Hurley just let me know of the following PhD scholarship

Hi Igor -- I don't know if you still put jobs/PhD scholarships on nuit blanche, but if you still do, would you mind sharing mine? It's an opportunity to build up foundational work for event-based cameras. https://www.westernsydney.edu.au/graduate_research_school/graduate_research_school/scholarships/current_scholarships/current_scholarships/scem_algorithms_for_event-driven_camera_analysis
Sure Paul ! Here is how the ad starts:

SCEM: Algorithms for Event-Driven Camera Analysis
School of Computing, Engineering and Mathematics
Scholarship code: 2019-089 
About the project
Event-driven cameras are exciting technology that do not acquire full images like traditional cameras, but record only intensity changes when they occur. The International Centre for Neuromorphic Systems at Western Sydney University has been adapting them to perform Neuromorphic space imaging. 
This PhD scholarship builds on this work to help develop the correct abstraction and a theory so as to improve knowledge extraction algorithms. It goes from modelling to algorithm testing using real data, working together with a world-class team.

What does the scholarship provide?
  • Domestic candidates will receive a tax-free stipend of $30,000(AUD) per annum for up to 3 years to support living costs, supported by the Research Training Program (RTP) Fee Offset.
  • International candidates will receive a tax-free stipend of $30,000(AUD) per annum for up to 3 years to support living costs. Those with a strong track record will be eligible for a tuition fee waiver.
  • Support for conference attendance, fieldwork and additional costs as approved by the School.
International candidates are required to hold an Overseas Student Health Care (OSHC)(opens in new window)insurance policy for the duration their study in Australia. This cost is not covered by the scholarship.


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Thursday, August 15, 2019

Jobs: 2 PhD and RA positions at University of Luxembourg

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Kumar also sent me the following announcements for different positions:

Dear Igor,
I was wondering if you could post on Nuit-Blanche the announcement of the following Ph.D./R.A. positions at SnT, University of Luxembourg on signal processing for next-generation radar systems.
Thanks!
--
Regards,


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