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The Many Faces of Exponential Weights in Online Learning

arXiv.org Machine Learning

A standard introduction to online learning might place Online Gradient Descent at its center and then proceed to develop generalizations and extensions like Online Mirror Descent and second-order methods. Here we explore the alternative approach of putting exponential weights (EW) first. We show that many standard methods and their regret bounds then follow as a special case by plugging in suitable surrogate losses and playing the EW posterior mean. For instance, we easily recover Online Gradient Descent by using EW with a Gaussian prior on linearized losses, and, more generally, all instances of Online Mirror Descent based on regular Bregman divergences also correspond to EW with a prior that depends on the mirror map. Furthermore, appropriate quadratic surrogate losses naturally give rise to Online Gradient Descent for strongly convex losses and to Online Newton Step. We further interpret several recent adaptive methods (iProd, Squint, and a variation of Coin Betting for experts) as a series of closely related reductions to exp-concave surrogate losses that are then handled by Exponential Weights. Finally, a benefit of our EW interpretation is that it opens up the possibility of sampling from the EW posterior distribution instead of playing the mean. As already observed by Bubeck and Eldan, this recovers the best-known rate in Online Bandit Linear Optimization.


Artificial Intelligence Website Creation 2018 (No Coding)

#artificialintelligence

This game-changing course will cover artificial intelligence tools in website, chatbot design and analytics which will help you to create website in minutes.


The Best Answers to Your Most Crucial Deep Learning Questions

#artificialintelligence

Talk to someone with programming skills and discuss any subject about deep learning with them so that you could quickly jump in as a newbie. Though some people figure out various libraries embedding math is used universally, you needn't understand the theory to implement deep learning tasks, I still recommend you learn some math knowledge like partial derivative. Some resources could give you a good starting point like Stanford's online course CS231n, Deep Learning at Oxford 2015and Andrew Ng's Coursera class. Also, some interesting online books like Neural Networks and Deep Learning could also give you an assistance to deep learning. Facilities and toolkits should also be available.


Slaughterbots ... #bankillerrobots stop autonomous weapons. Del panóptico de Bentham al ...

#artificialintelligence

Whenever you are about to be oppressed, you have a right to resist oppression: whenever you conceive yourself to be oppressed, conceive yourself to have a right to make resistance, and act accordingly. In proportion as a law of any kind--any act of power, supreme or subordinate, legislative, administrative, or judicial, is unpleasant to a man, especially if, in consideration of such its unpleasantness, his opinion is, that such act of power ought not to have been exercised, he of course looks upon it as oppression: as often as anything of this sort happens to a man--as often as anything happens to a man to inflame his passions,--this article, for fear his passions should not be sufficiently inflamed of themselves, sets itself to work to blow the flame, and urges him to resistance. Submit not to any decree or other act of power, of the justice of which you are not yourself perfectly convinced. If a constable call upon you to serve in the militia, shoot the constable and not the enemy;--if the commander of a press-gang trouble you, push him into the sea--if a bailiff, throw him out of the window. If a judge sentence you to be imprisoned or put to death, have a dagger ready, and take a stroke first at the judge.


Black-Box Reductions for Parameter-free Online Learning in Banach Spaces

arXiv.org Machine Learning

We introduce several new black-box reductions that significantly improve the design of adaptive and parameter-free online learning algorithms by simplifying analysis, improving regret guarantees, and sometimes even improving runtime. We reduce parameter-free online learning to online exp-concave optimization, we reduce optimization in a Banach space to one-dimensional optimization, and we reduce optimization over a constrained domain to unconstrained optimization. All of our reductions run as fast as online gradient descent. We use our new techniques to improve upon the previously best regret bounds for parameter-free learning, and do so for arbitrary norms.


Dropout Model Evaluation in MOOCs

arXiv.org Machine Learning

The field of learning analytics needs to adopt a more rigorous approach for predictive model evaluation that matches the complex practice of model-building. In this work, we present a procedure to statistically test hypotheses about model performance which goes beyond the state-of-the-practice in the community to analyze both algorithms and feature extraction methods from raw data. We apply this method to a series of algorithms and feature sets derived from a large sample of Massive Open Online Courses (MOOCs). While a complete comparison of all potential modeling approaches is beyond the scope of this paper, we show that this approach reveals a large gap in dropout prediction performance between forum-, assignment-, and clickstream-based feature extraction methods, where the latter is significantly better than the former two, which are in turn indistinguishable from one another. This work has methodological implications for evaluating predictive or AI-based models of student success, and practical implications for the design and targeting of at-risk student models and interventions.



Learn how to build Raspberry Pi computers with this $15 online class

Mashable

Just to let you know, if you buy something featured here, Mashable might earn an affiliate commission. A partnership between Broadcom and the University of Cambridge, the U.K. based Raspberry Pi Foundation creates credit card-sized computers that promote learning how to code and educational research. Since the computers went on the market in 2012, Raspberry Pi has sold over eight million models and is the United Kingdom's best-selling computer. Setting up a Raspberry Pi is easy. Simply plug in a monitor, mouse, and keyboard, and install the computer.


Analysis of Dropout in Online Learning

arXiv.org Machine Learning

Deep learning is the state-of-the-art in fields such as visual object recognition and speech recognition. This learning uses a large number of layers and a huge number of units and connections. Therefore, overfitting is a serious problem with it, and the dropout which is a kind of regularization tool is used. However, in online learning, the effect of dropout is not well known. This paper presents our investigation on the effect of dropout in online learning. We analyzed the effect of dropout on convergence speed near the singular point. Our results indicated that dropout is effective in online learning. Dropout tends to avoid the singular point for convergence speed near that point.


Machine Learning with R Programming - Udemy

@machinelearnbot

This course contains lectures as videos along with the hands-on implementation of the concepts, additional assignments are also provided in the last section for your self-practice, working files are provided along with the first lecture. This course contains lectures as videos along with the hands-on implementation of the concepts, additional assignments are also provided in the last section for your self-practice, working files are provided along with the first lecture.