Massimo Mascaro
I have a PhD in Computational Neuroscience and a background in applications of neural networks to computer vision and learning via attention.
Recently I'm interested in active and reinforcement learning applications to personalization.
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AutoML for Contextual Bandits
Praneet Dutta
Man Kit (Joe) Cheuk
Jonathan Kim
REVEAL Workshop @ ACM RecSys 2019 Conference, Copenhagen (2019) (to appear)
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Contextual Bandits is one of the widely popular techniques used in applications such as personalization, recommendation systems, mobile health, causal marketing etc . As a dynamic approach, it can be more efficient than standard A/B testing in minimizing regret. We propose an end to end meta-learning pipeline to approximate the optimal Q function for contextual bandits problems. We see that our model is able to perform much better than random exploration, being more regret efficient and able to converge with a limited number of samples, while remaining very general and easy to use due to the meta-learning approach.We used a linearly annealed e-greedy exploration policy to define the exploration vs exploitation schedule. We tested the system on a synthetic environment to characterize it fully and we evaluated it on some open source datasets. We see that our model outperforms or performs comparatively to other models while requiring no tuning nor feature engineering.
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3D Conditional Generative Adversarial Networks to enable large-scale seismic image enhancement
Praneet Dutta
Bruce Power
Adam Halpert
Carlos Ezequiel
Aravind Subramanian
Chanchal Chatterjee
Sindhu Hari
Kenton Prindle
Vishal Vaddina
Andrew Leach
Raj Domala
Laura Bandura
NeurIPS (2019) (to appear)
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We propose GAN-based image enhancement models for frequency enhancement of 2D and 3D seismic images. Seismic imagery is used to understand and characterize the Earth's subsurface for energy exploration. Because these images often suffer from resolution limitations and noise contamination, our proposed method performs large-scale seismic volume frequency enhancement and denoising. The enhanced images reduce uncertainty and improve decisions about issues, such as optimal well placement, that often rely on low signal-to-noise ratio (SNR) seismic volumes. We explored the impact of adding lithology class information to the models, resulting in improved performance on PSNR and SSIM metrics over a baseline model with no conditional information.
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