© 2019 Strange Loop
Stan is a probabilistic programming language for statistical modeling, data analysis, and prediction with interfaces in R, Python, and other languages. By implementing a statistical model in Stan, one can perform Bayesian inference using Markov-Chain Monte-Carlo (MCMC) as well as optimization and variational inference.
ScalaStan is a fundamentally new kind of interface to Stan. Not only does ScalaStan allow one to interface with Stan from Scala, but, unlike the other Stan interfaces, ScalaStan also supports the type-safe programmatic manipulation and generation of Stan programs via an embedded domain-specific language (DSL). Thus, ScalaStan allows one to fully specify a Stan program in Scala, marshal data to and from the program in a type-safe way, and cache Stan models for fast iteration.
In this talk, we show how the Scala type system allows us to enforce type-safety in the Stan model and prevents us from generating invalid Stan code. Next, we show how the ScalaStan DSL can be used to generate higher-level Stan models. Finally, we dive into the details of several specific techniques ScalaStan employs to enforce type safety and prevent invalid code in an embedded DSL.
Joe is a Senior Engineer at CiBO Technologies where he uses Scala to help build sophisticated models of millions of farms. Joe has a passion for programming languages and computer architecture. As part of his PhD dissertation, Joe created an embedded DSL in Scala for generating FPGA code. Previously, Joe created highly efficient low-level code you might have used if you ever played a game on your highschool TI-83 calculator, used a micro-Linux window manager, or made some high-frequency trades.