Other

Royal Bank of Canada

Samsung Electronics Co., Ltd.

The Governing Council of the University of Toronto

Marcus Anthony Brubaker

David James Fleet

Ali Punjani

Bo Chang

Michael S Brown

Yanshuai Cao

Gregory Mori

Andreas Steffen Michael Lehrmann

Pierre Duez

Ruizhi Deng

Ali Maleky

Ryan Lilien

Zhexin Lai

Amir H Khoshaman

A noise model is iteratively trained to simulate introduction of noise by a capture device, by use of a denoiser and a training data set of pairs of noisy signals. First and second noisy signals of each pair are independently sampled by the capture device from source information corresponding to the pair. Each iteration of training obtains first and second denoised signals from respective noisy signals, then optimizes at least one loss function which sums first and second terms to train both the noise model and the denoiser, where the first term is based on the first denoised signal and the second noisy signal, and the second term is based on the second denoised signal and the first noisy signal. By using noisy samples, the complexities of obtaining 'clean' signals are avoided. By using “cross-sample” loss functions, convergence on undesired training results is avoided without complex regularization.

System and method for training of noise model using noisy signal pairs

Systems and methods for machine learning architecture for time series data prediction. The system may include a processor and a memory storing processor-executable instructions. The processor-executable instructions, when executed, may configure the processor to: obtain time series data associated with a data query; generate a predicted value based on a sampled realization of the time series data and a continuous time generative model, the continuous time generative model trained to define an invertible mapping to maximize a log-likelihood of a set of predicted values for a time range associated with the time series data; and generate a signal providing an indication of the predicted value associated with the data query.

Systems and methods for modeling continuous stochastic processes with dynamic normalizing flows

A system for computational estimation sampling from non-trivial probability distributions. The system comprises a processor, operating in conjunction with computer memory. The processor is configured to conduct importance sampling using normalizing flows where a base distribution has a set of parameters that can be adjusted to account for heavy-tailed distributions.

System and method for machine learning architecture with adaptive importance sampling with normalizing flows

A variational hyper recurrent neural network (VHRNN) can be trained by, for each step in sequential training data: determining a prior probability distribution for a latent variable from a prior network of the VHRNN using an initial hidden state; determining a hidden state from a recurrent neural network (RNN) of the VHRNN using an observation state, the latent variable and the initial hidden state; determining an approximate posterior probability distribution for the latent variable from an encoder network of the VHRNN using the observation state and the initial hidden state; determining a generating probability distribution for the observation state from a decoder network of the VHRNN using the latent variable and the initial hidden state; and maximizing a variational lower bound of a marginal log-likelihood of the training data. The trained VHRNN can be used to generate sequential data.

System and method for machine learning architecture with variational hyper-RNN

Disclosed herein are systems and methods for efficient 3D structure estimation from images of a transmissive object, including cryo-EM images. The method generally comprises, receiving a set of 2D images of a target specimen from an electron microscope, carrying out a reconstruction technique to determine a likely molecular structure, and outputting the estimated 3D structure of the specimen. The described reconstruction technique comprises: establishing a probabilistic model of the target structure; optimizing using stochastic optimization to determine which structure is most likely; and, optionally utilizing importance sampling to minimize computational burden.

Methods and systems for 3D structure estimation

A system and a method for image alignment between at least two images to a three-dimensional model. The method including: determining a lower bound and an upper bound of an acceptable likelihood of mismatch between the at least two images; evaluating the likelihood of mismatch between the at least two images over a set of poses (r), shifts (t), or both poses (r) and shifts (t); and discarding those evaluations resulting beyond the lower bound and upper bound.

Methods and systems for image alignment of at least one image to a model

The inventive systems and methods relate to the field of matching toolmarks for firearm forensics having a retrographic sensor to provide a three dimensional representation of a surface of an object for heatmapping analyzed matching geometric features.

Growing community of inventors

Toronto, Canada

Marcus Anthony Brubaker