Bayesian Inference


Data Science Has Been Using Rebel Statistics for a Long Time

@machinelearnbot

New statistics or fake data science textbooks are published every week but with the exact same technical content: KNN clustering, logistic regression, naive Bayes, decision and boosted trees, SVM, Bayesian statistics, centroid clustering, linear discrimination - as in the early eighties, applied to tiny data such as Fisher's iris data set. If you compare traffic statistics (Alexa rank) from top traditional statistics websites, with data science websites, the contrast is surprising. These numbers are based on Alexa rankings, which are notoriously inaccurate, though over time, they have improved their statistical science to measure and filter Internet traffic, and the numbers that I quote here have been stable recently, showing the same trend for months, and subject to a small 30% error rate (compared to 100% error rate a few years ago, based on comparing Alexa variances over time for multiple websites that we own and for which we know exact traffic stats after filtering out robots). Modern statistical data science techniques are far more robust than traditional statistics, and designed for big data.


What's New in MATLAB Data Analytics - MATLAB & Simulink

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Manipulate and analyze data that is too big to fit in memory. Perform support vector machine (SVM) and Naive Bayes classification, create bags of decision trees, and fit lasso regression on out-of-memory data. Process big data with tall arrays in parallel on your desktop, MATLAB Distributed Computing Server, and Spark clusters. Develop clients for MATLAB Production Server in any programming language that supports HTTP.


The Mathematics of Machine Learning

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In the last few months, I have had several people contact me about their enthusiasm for venturing into the world of data science and using Machine Learning (ML) techniques to probe statistical regularities and build impeccable data-driven products. Machine Learning theory is a field that intersects statistical, probabilistic, computer science and algorithmic aspects arising from learning iteratively from data and finding hidden insights which can be used to build intelligent applications. The main question when trying to understand an interdisciplinary field such as Machine Learning is the amount of maths necessary and the level of maths needed to understand these techniques. Some of the fundamental Statistical and Probability Theory needed for ML are Combinatorics, Probability Rules & Axioms, Bayes' Theorem, Random Variables, Variance and Expectation, Conditional and Joint Distributions, Standard Distributions (Bernoulli, Binomial, Multinomial, Uniform and Gaussian), Moment Generating Functions, Maximum Likelihood Estimation (MLE), Prior and Posterior, Maximum a Posteriori Estimation (MAP) and Sampling Methods.


[P] Attempted implementation of Solomonoff induction • r/MachineLearning

@machinelearnbot

The first challenge is that Solomonoff's approach is purely deterministic, the coded models produce a string output and if the string output doesn't exactly match the target output then the model is considered wrong. In this way when calculating the priors I consider the prior probability of the family of models; there is no prior over the parameters, only a prior probability for the type of model. It's best to use a low-level programming language, a high level language favours complex models. The posterior probability of the constant model dropped to 99.9% of its prior value, the inverse model's probability remained about the same and the remaining models; probability approximately doubled.


When not to use deep learning

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In sum, he argues that when the sample size is small (which happens a lot in the bio domain), linear models with few parameters perform better than deep nets even with a modicum of layers and hidden units. In essence, every time that you do some form of numerical optimization, you're performing some Bayesian inference with particular assumptions and priors. On the other hand, if you decrease the learning parameter, the Markov chain slowly approximates narrower minima until it converges in a tight region; that is, you increase the bias for a certain region. Another parameter, the batch size in SGD, also controls what type of region the algorithm converges two: wider regions for small batches and sharper regions with larger batches.


How Can Finance Catch Up With Other Intelligent Real-Time Systems?

International Business Times

Paul Bilokon, founder of Thalesians, an organisation to promote deeper thinking and philosophy within finance, points out that many non-financial systems are using software techniques that are far ahead. Paul will be speaking about new infrastructure and showing off some machine learning libraries at the forthcoming IBT data science and capital markets event. Advances in optimisation are being driven by techniques like Bayesian Learning, complemented by technological advances in terms of infrastructure; projects like Apache Spark; kdb and q language. That's because they use Bayesian learning methods to update information on behavioural trends.


How Bayesian Inference Works

@machinelearnbot

Since there are 25 long haired women and 2 long haired men, guessing that the ticket owner is a woman is a safe bet. To lay our foundation, we need to quickly mention four concepts: probabilities, conditional probabilities, joint probabilities and marginal probabilities. The probability of a thing happening is the number of ways that thing can happen divided by the total number of things that can happen. Combining these by multiplication gives the joint probability, P(woman with short hair) P(woman) * P(short hair woman).


AI – The Present in the Making

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But Professor Jon Oberlander disagrees. With a plethora of functions, Alexa quickly gained much popularity and fame. The next thing on Professor Jon Oberlander's list was labeling images on search engines. Over the years, machine translation has also gained popularity as numerous people around the world rely on these translators.


AI – The Present in the Making

@machinelearnbot

For many people, the concept of Artificial Intelligence (AI) is a thing of the future. With a plethora of functions, Alexa quickly gained much popularity and fame. The next thing on lProfessor Jon Oberlander's ist was labeling images on search engines. Over the years, machine translation has also gained popularity as numerous people around the world rely on these translators.


AI – The Present in the Making -

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With a plethora of functions, Alexa quickly gained much popularity and fame. The next thing on Professor Jon Oberlander's list was labeling images on search engines. Over the years, machine translation has also gained popularity as numerous people around the world rely on these translators. Ronald has been recognized as one of the top 10 Global Big Data, IoT, Data Science, Predictive Analytics, Business Intelligence Influencer by Onalytica, Data Science Central, Klout, Dataconomy, is author for leading Big Data sites like The Economist, Datafloq and Data Science Central.