Africa
Generative Adversarial Transformers
Hudson, Drew A., Zitnick, C. Lawrence
We introduce the GANsformer, a novel and efficient type of transformer, and explore it for the task of visual generative modeling. The network employs a bipartite structure that enables long-range interactions across the image, while maintaining computation of linearly efficiency, that can readily scale to high-resolution synthesis. It iteratively propagates information from a set of latent variables to the evolving visual features and vice versa, to support the refinement of each in light of the other and encourage the emergence of compositional representations of objects and scenes. In contrast to the classic transformer architecture, it utilizes multiplicative integration that allows flexible region-based modulation, and can thus be seen as a generalization of the successful StyleGAN network. We demonstrate the model's strength and robustness through a careful evaluation over a range of datasets, from simulated multi-object environments to rich real-world indoor and outdoor scenes, showing it achieves state-of-the-art results in terms of image quality and diversity, while enjoying fast learning and better data-efficiency. Further qualitative and quantitative experiments offer us an insight into the model's inner workings, revealing improved interpretability and stronger disentanglement, and illustrating the benefits and efficacy of our approach. An implementation of the model is available at https://github.com/dorarad/gansformer.
U of T researchers train AI to read difficult-to-decipher medieval texts
In a move that could transform manuscript studies, University of Toronto researchers have partnered with a team in the United Kingdom to develop a program that can read and transcribe the handwritten Latin found in 13th-century legal manuscripts. While scholars have been making digital images of these manuscripts for years, transcribing and comparing these texts is painstaking and tedious work that can take years or even decades to complete. That's because medieval handwriting can often look crabbed and unintelligible, with non-standardized spellings, hyphenations, abbreviations, calligraphic flourishes and any number of distinct "hands." But machine-reading software called Transkribus promises to change the field. Using artificial intelligence (AI), the software can theoretically be trained to read any type of handwriting, in any language – and Michael Gervers, a professor of medieval social and economic history at U of T Scarborough, says it could eventually be applied across medieval studies.
ARTIFICIAL INTELLIGENCE ONLINE TRAINING COHORT III REGISTRATION
TechMindset Africa is a world class Africa AI- training institution that breaks down Artificial Intelligence and Machine Learning concepts into simple, understandable bite-sized information to everyone who needs to understand AI and its role in our future. Our objective is: 1. Help you explore the world of AI and learn the impossible in your possible 2. Make you become the change your business needs, your organization needs, or the change your boss cannot ignore 3. We not only work with you to enable you discuss AI in its relevant context, but task you to create AI concepts in real life situations.
Artificial Intelligence-based Security Market is Booming in Upcoming Year
Global Artificial Intelligence-based Security Market Size, Status and Forecast 2021-2027, Covid 19 Outbreak Impact research report added by Report Ocean, is an in-depth analysis of market characteristics, size and growth, segmentation, regional and country breakdowns, competitive landscape, market shares, trends and strategies for this market. It traces the market's historic and forecast market growth by geography. It places the market within the context of the wider Artificial Intelligence-based Security market, and compares it with other markets., market definition, regional market opportunity, sales and revenue by region, manufacturing cost analysis, Industrial Chain, market effect factors analysis, Artificial Intelligence-based Security market size forecast, market data & Graphs and Statistics, Tables, Bar & Pie Charts, and many more for business intelligence. Get complete Report (Including Full TOC, 100 Tables & Figures, and Chart). Artificial Intelligence-based Security market is segmented by company, region (country), by Type, and by Application.
'Deep Nostalgia': New online AI tool brings portraits of dead relatives to life, some call it 'spooky' - The Economic Times
Like the animated paintings that adorn the walls of Harry Potter's school, a new online tool promises to bring portraits of dead relatives to life, stirring debate about the use of technology to impersonate people. Genealogy company MyHeritage launched its "Deep Nostalgia" feature earlier this week, allowing users to turn stills into short videos showing the person in the photograph smiling, winking and nodding. "Seeing our beloved ancestors' faces come to life ... lets us imagine how they might have been in reality, and provides a profound new way of connecting to our family history," MyHeritage founder Gilad Japhet said in a statement. Developed with Israeli computer vision firm D-ID, Deep Nostalgia uses deep learning algorithms to animate images with facial expressions that were based on those of MyHeritage employees. Some of the company's users took to Twitter on Friday to share the animated images of their deceased relatives, as well as moving depictions of historical figures, including Albert Einstein and Ancient Egypt's lost Queen Nefertiti.
Kernel Interpolation for Scalable Online Gaussian Processes
Stanton, Samuel, Maddox, Wesley J., Delbridge, Ian, Wilson, Andrew Gordon
Gaussian processes (GPs) provide a gold standard for performance in online settings, such as sample-efficient control and black box optimization, where we need to update a posterior distribution as we acquire data in a sequential fashion. However, updating a GP posterior to accommodate even a single new observation after having observed $n$ points incurs at least $O(n)$ computations in the exact setting. We show how to use structured kernel interpolation to efficiently recycle computations for constant-time $O(1)$ online updates with respect to the number of points $n$, while retaining exact inference. We demonstrate the promise of our approach in a range of online regression and classification settings, Bayesian optimization, and active sampling to reduce error in malaria incidence forecasting. Code is available at https://github.com/wjmaddox/online_gp.
Fast Adaptation with Linearized Neural Networks
Maddox, Wesley J., Tang, Shuai, Moreno, Pablo Garcia, Wilson, Andrew Gordon, Damianou, Andreas
The inductive biases of trained neural networks are difficult to understand and, consequently, to adapt to new settings. We study the inductive biases of linearizations of neural networks, which we show to be surprisingly good summaries of the full network functions. Inspired by this finding, we propose a technique for embedding these inductive biases into Gaussian processes through a kernel designed from the Jacobian of the network. In this setting, domain adaptation takes the form of interpretable posterior inference, with accompanying uncertainty estimation. This inference is analytic and free of local optima issues found in standard techniques such as fine-tuning neural network weights to a new task. We develop significant computational speed-ups based on matrix multiplies, including a novel implementation for scalable Fisher vector products. Our experiments on both image classification and regression demonstrate the promise and convenience of this framework for transfer learning, compared to neural network fine-tuning. Code is available at https://github.com/amzn/xfer/tree/master/finite_ntk.
Dynamic covariate balancing: estimating treatment effects over time
Viviano, Davide, Bradic, Jelena
This paper discusses the problem of estimation and inference on time-varying treatments. We propose a method for inference on treatment histories, by introducing a \textit{dynamic} covariate balancing method. Our approach allows for (i) treatments to propagate arbitrarily over time; (ii) non-stationarity and heterogeneity of treatment effects; (iii) high-dimensional covariates, and (iv) unknown propensity score functions. We study the asymptotic properties of the estimator, and we showcase the parametric convergence rate of the proposed procedure. We illustrate in simulations and an empirical application the advantage of the method over state-of-the-art competitors.
Contrastive Explanations for Model Interpretability
Jacovi, Alon, Swayamdipta, Swabha, Ravfogel, Shauli, Elazar, Yanai, Choi, Yejin, Goldberg, Yoav
Contrastive explanations clarify why an event occurred in contrast to another. They are more inherently intuitive to humans to both produce and comprehend. We propose a methodology to produce contrastive explanations for classification models by modifying the representation to disregard non-contrastive information, and modifying model behavior to only be based on contrastive reasoning. Our method is based on projecting model representation to a latent space that captures only the features that are useful (to the model) to differentiate two potential decisions. We demonstrate the value of contrastive explanations by analyzing two different scenarios, using both high-level abstract concept attribution and low-level input token/span attribution, on two widely used text classification tasks. Specifically, we produce explanations for answering: for which label, and against which alternative label, is some aspect of the input useful? And which aspects of the input are useful for and against particular decisions? Overall, our findings shed light on the ability of label-contrastive explanations to provide a more accurate and finer-grained interpretability of a model's decision.
Lessons from the PULSE Model and Discussion
Dr. LeCun tweets that "ML systems are biased when data is biased." This can be interpreted in multiple ways, with one interpretation being that data is the only factor that matters, and another being that data is the main problem in this particular case. Dr. Gebru replies in an exasperated way noting that the first possible interpretation is incorrect and that experts such as her say this often. Implicitly, it's clear that this exasperation must be partially because this is a common and harmful misconception experts such as Dr. Gebru have to fight against.