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Probabilistic programming (PP) is a programming paradigm in which probabilistic models are specified and inference for these models is performed automatically.[1] It represents an attempt to unify probabilistic modeling and traditional general purpose programming in order to make the former easier and more widely applicable.[2][3] It can be used to create systems that help make decisions in the face of uncertainty.

Programming languages used for probabilistic programming are referred to as "probabilistic programming languages" (PPLs).

## Applications

Probabilistic reasoning has been used for a wide variety of tasks such as predicting stock prices, recommending movies, diagnosing computers, detecting cyber intrusions and image detection.[4] However, until recently (partially due to limited computing power), probabilistic programming was limited in scope, and most inference algorithms had to be written manually for each task.

Nevertheless, in 2015, a 50-line probabilistic computer vision program was used to generate 3D models of human faces based on 2D images of those faces. The program used inverse graphics as the basis of its inference method, and was built using the Picture package in Julia.[4] This made possible "in 50 lines of code what used to take thousands".[5][6]

The Gen probabilistic programming library (also written in Julia) has been applied to vision and robotics tasks.[7]

More recently, the probabilistic programming system Turing.jl has been applied in various pharmaceutical[8] and economics applications.[9]

Probabilistic programming in Julia has also been combined with differentiable programming by combining the Julia package Zygote.jl with Turing.jl. [10]

Probabilistic programming languages are also commonly used in Bayesian cognitive science to develop and evaluate models of cognition. [11]

## Probabilistic programming languages

PPLs often extend from a basic language. For instance, Turing.jl[12] is based on Julia, Infer.NET is based on .NET Framework,[13] while PRISM extends from Prolog.[14] However, some PPLs, such as WinBUGS, offer a self-contained language that maps closely to the mathematical representation of the statistical models, with no obvious origin in another programming language.[15][16]

The language for WinBUGS was implemented to perform Bayesian computation using Gibbs Sampling and related algorithms. Although implemented in a relatively unknown programming language (Component Pascal), this language permits Bayesian inference for a wide variety of statistical models using a flexible computational approach. The same BUGS language may be used to specify Bayesian models for inference via different computational choices ("samplers") and conventions or defaults, using a standalone program WinBUGS (or related R packages, rbugs and r2winbugs) and JAGS (Just Another Gibbs Sampler, another standalone program with related R packages including rjags, R2jags, and runjags). More recently, other languages to support Bayesian model specification and inference allow different or more efficient choices for the underlying Bayesian computation, and are accessible from the R data analysis and programming environment, e.g.: Stan, NIMBLE and NUTS. The influence of the BUGS language is evident in these later languages, which even use the same syntax for some aspects of model specification.

Several PPLs are in active development, including some in beta test. Two popular tools are Stan and PyMC.[17]

### Relational

A probabilistic relational programming language (PRPL) is a PPL specially designed to describe and infer with probabilistic relational models (PRMs).

A PRM is usually developed with a set of algorithms for reducing, inference about and discovery of concerned distributions, which are embedded into the corresponding PRPL.

### Probabilistic logic programming

Probabilistic logic programming is a programming paradigm that extends logic programming with probabilities.

Most approaches to probabilistic logic programming are based on the distribution semantics, which splits a program into a set of probabilistic facts and a logic program. It defines a probability distribution on interpretations of the Herbrand universe of the program.[18]

### List of probabilistic programming languages

This list summarises the variety of PPLs that are currently available, and clarifies their origins.

This article may contain an excessive amount of intricate detail that may interest only a particular audience. Please help by spinning off or relocating any relevant information, and removing excessive detail that may be against Wikipedia's inclusion policy. (October 2019) (Learn how and when to remove this message)
Name Extends from Host language
Analytica[19] C++
bayesloop[20][21] Python Python
Bean Machine[22] PyTorch Python
Venture[23] Scheme C++
BayesDB[24] SQLite, Python
PRISM[14] B-Prolog
Infer.NET[13] .NET Framework .NET Framework
diff-SAT[25] Answer set programming, SAT (DIMACS CNF)
PSQL[26] SQL
BUGS[15] Component Pascal
Dyna[27] Prolog
Figaro[28] Scala Scala
ProbLog[29] Prolog Python
ProBT[30] C++, Python
Stan[16] BUGS C++
ProbCog[33] Java, Python
PyMC[34] Python Python
Rainier[35][36] Scala Scala
greta[37] TensorFlow R
pomegranate[38] Python Python
Lea[39] Python Python
WebPPL[40] JavaScript JavaScript
Picture[4] Julia Julia
Turing.jl[12] Julia Julia
Gen[41] Julia Julia
Edward[42] TensorFlow Python
TensorFlow Probability[43] TensorFlow Python
Edward2[44] TensorFlow Probability Python
Pyro[45] PyTorch Python
NumPyro[46] JAX Python
Birch[47] C++
PSI[48] D
Blang[49]
MultiVerse[50] Python Python

## Difficulty

Reasoning about variables as probability distributions causes difficulties for novice programmers, but these difficulties can be addressed through use of Bayesian network visualisations and graphs of variable distributions embedded within the source code editor.[51]

## Notes

1. ^ "Probabilistic programming does in 50 lines of code what used to take thousands". phys.org. April 13, 2015. Retrieved April 13, 2015.
2. ^ "Probabilistic Programming". probabilistic-programming.org. Archived from the original on January 10, 2016. Retrieved December 24, 2013.
3. ^ Pfeffer, Avrom (2014), Practical Probabilistic Programming, Manning Publications. p.28. ISBN 978-1 6172-9233-0
4. ^ a b c "Short probabilistic programming machine-learning code replaces complex programs for computer-vision tasks". KurzweilAI. April 13, 2015. Retrieved November 27, 2017.
5. ^ Hardesty, Larry (April 13, 2015). "Graphics in reverse".
6. ^
7. ^ "MIT's Gen programming system flattens the learning curve for AI projects". VentureBeat. June 27, 2019. Retrieved June 27, 2019.
8. ^ Semenova, Elizaveta; Williams, Dominic P.; Afzal, Avid M.; Lazic, Stanley E. (November 1, 2020). "A Bayesian neural network for toxicity prediction". Computational Toxicology. 16: 100133. doi:10.1016/j.comtox.2020.100133. ISSN 2468-1113. S2CID 225362130.
9. ^ Williams, Dominic P.; Lazic, Stanley E.; Foster, Alison J.; Semenova, Elizaveta; Morgan, Paul (2020), "Predicting Drug-Induced Liver Injury with Bayesian Machine Learning", Chemical Research in Toxicology, 33 (1): 239–248, doi:10.1021/acs.chemrestox.9b00264, PMID 31535850, S2CID 202689667
10. ^ Innes, Mike; Edelman, Alan; Fischer, Keno; Rackauckas, Chris; Saba, Elliot; Viral B Shah; Tebbutt, Will (2019). "∂P: A Differentiable Programming System to Bridge Machine Learning and Scientific Computing". arXiv:1907.07587 [cs.PL].
11. ^ Goodman, Noah D; Tenenbaum, Joshua B; Buchsbaum, Daphna; Hartshorne, Joshua; Hawkins, Robert; O'Donnell, Timothy J; Tessler, Michael Henry. "Probabilistic Models of Cognition". Probabilistic Models of Cognition - 2nd Edition. Retrieved May 27, 2023.
12. ^ a b "The Turing language for probabilistic programming". GitHub. December 28, 2021.
13. ^ a b "Infer.NET". microsoft.com. Microsoft.
14. ^ a b "PRISM: PRogramming In Statistical Modeling". rjida.meijo-u.ac.jp. Archived from the original on March 1, 2015. Retrieved July 8, 2015.
15. ^ a b "The BUGS Project - MRC Biostatistics Unit". cam.ac.uk. Archived from the original on March 14, 2014. Retrieved January 12, 2011.
16. ^ a b "Stan". mc-stan.org. Archived from the original on September 3, 2012.
17. ^ "The Algorithms Behind Probabilistic Programming". Retrieved March 10, 2017.
18. ^ De Raedt, Luc; Kimmig, Angelika (July 1, 2015). "Probabilistic (logic) programming concepts". Machine Learning. 100 (1): 5–47. doi:10.1007/s10994-015-5494-z. ISSN 1573-0565.
19. ^ "Analytica-- A Probabilistic Modeling Language". lumina.com.
20. ^ "bayesloop - Probabilistic programming framework". bayesloop.com.
21. ^ "GitHub -- bayesloop". GitHub. December 7, 2021.
22. ^
23. ^ "Venture -- a general-purpose probabilistic programming platform". mit.edu. Archived from the original on January 25, 2016. Retrieved September 20, 2014.
24. ^
25. ^ "diff-SAT (probabilistic SAT/ASP)". GitHub. October 8, 2021.
26. ^ Dey, Debabrata; Sarkar, Sumit (1998). "PSQL: A query language for probabilistic relational data". Data & Knowledge Engineering. 28: 107–120. doi:10.1016/S0169-023X(98)00015-9.
27. ^ "Dyna". www.dyna.org. Archived from the original on January 17, 2016. Retrieved January 12, 2011.
28. ^ "Charles River Analytics - Probabilistic Modeling Services". cra.com. February 9, 2017.
29. ^ "ProbLog: Probabilistic Programming". dtai.cs.kuleuven.be.
30. ^ ProbaYes. "ProbaYes - Ensemble, nous valorisations vos données". probayes.com. Archived from the original on March 5, 2016. Retrieved November 26, 2013.
33. ^ "ProbCog". GitHub.
34. ^ PyMC devs. "PyMC". pymc-devs.github.io.
35. ^ stripe/rainier, Stripe, August 19, 2020, retrieved August 26, 2020
36. ^ "Rainier · Bayesian inference for Scala". samplerainier.com. Retrieved August 26, 2020.
37. ^ "greta: simple and scalable statistical modelling in R". GitHub. Retrieved October 2, 2018.
38. ^ "Home — pomegranate 0.10.0 documentation". pomegranate.readthedocs.io. Retrieved October 2, 2018.