gym-http-api (hackage): This library provides a REST client to the gym open-source library. gym-http-api itself provides a python-based REST server to the gym open-source library, allowing development in languages other than python.  Note that the openai/gym-http-api is a monorepo of all language-clients. This hackage library tracks stites/gym-http-api which is the actively-maintained haskell fork.
Keywords: learning-environments|library|mit|program|web