Bayesian Networks


amidst/toolbox

#artificialintelligence

AMIDST provides tailored parallel (powered by Java 8 Streams) and distributed (powered by Flink or Spark) implementations of Bayesian parameter learning for batch and streaming data. Dynamic Bayesian networks: Code Examples includes some source code examples of functionalities related to Dynamic Bayesian networks. FlinkLink: Code Examples includes some source code examples of functionalities related to the module that integrates Apache Flink with AMIDST. As an example, the following figure shows how the data processing capacity of our toolbox increases given the number of CPU cores when learning an a probabilistic model (including a class variable C, two latent variables (dashed nodes), multinomial (blue nodes) and Gaussian (green nodes) observable variables) using the AMIDST's learning engine.


[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.


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

#artificialintelligence

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.


Numbers war: How Bayesian vs frequentist statistics influence AI

#artificialintelligence

In other words, infected people test positive 99 per cent of the time and healthy people test negative 99 per cent of the time. We also need a figure for the prevalence of the infection in the population; if we don't know it, we can start by guessing that half of the population is infected and half is healthy. But this line of reasoning ignores the fact that 1 per cent of the healthy people will test positive and, as the proportion of healthy people increases, the number of those healthy people who test as positive begins to overwhelm those who are infected and also test positive. In slightly more formal terms we would say that the number of false positives (healthy people being misdiagnosed) begins to overwhelm the true positives (infected people testing positive).



Bayesian Basics, Explained

@machinelearnbot

Andrew Gelman: Bayesian statistics uses the mathematical rules of probability to combines data with "prior information" to give inferences which (if the model being used is correct) are more precise than would be obtained by either source of information alone. You can reproduce the classical methods using Bayesian inference: In a regression prediction context, setting the prior of a coefficient to uniform or "noninformative" is mathematically equivalent to including the corresponding predictor in a least squares or maximum likelihood estimate; setting the prior to a spike at zero is the same as excluding the predictor, and you can reproduce a pooling of predictors thorough a joint deterministic prior on their coefficients. When Bayesian methods work best, it's by providing a clear set of paths connecting data, mathematical/statistical models, and the substantive theory of the variation and comparison of interest. Bayesian methods offer a clarity that comes from the explicit specification of a so-called "generative model": a probability model of the data-collection process and a probability model of the underlying parameters.


CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers

#artificialintelligence

Chapter 1: Introduction to Bayesian Methods Introduction to the philosophy and practice of Bayesian methods and answering the question, "What is probabilistic programming?" Chapter 2: A little more on PyMC We explore modeling Bayesian problems using Python's PyMC library through examples. Chapter 1: Introduction to Bayesian Methods Introduction to the philosophy and practice of Bayesian methods and answering the question, "What is probabilistic programming?" Chapter 2: A little more on PyMC We explore modeling Bayesian problems using Python's PyMC library through examples.