Having libraries in your Python project properly locked to a specific version is a well known best practice. Dependency management tools in the Python ecosystem lock dependencies to the latest version available, but what if the latest version available is not the best fit for your application? Open source project Thoth is an advanced Python dependency resolver which recommends libraries for your project based on observations that are gathered for Python libraries for specific runtime environments. How these recommendations look like? How are different observations like performance characteristics of machine learning libraries for a particular hardware gathered?