Language Reference

This document provides references to embedded languages and IRs in the TVM stack.

Introduction to Relay

Relay is a functional, differentiable programming language designed to be an expressive intermediate representation for machine learning systems. Relay supports closures, control flow, and recursion, allowing it to directly represent more complex models than can computation graph-based IRs. Relay also includes a form of dependent typing using type relations in order to handle shape analysis for operators with complex requirements on argument shapes.

Relay is extensible by design and makes it easy for machine learning researchers and practitioners to develop new large-scale program transformations and optimizations.

The below pages describe the grammar, type system, and operators in Relay, respectively.

Hybrid Script

The below page describes the TVM hybrid script front-end, which uses software emulation to support some constructs not officially supported in TVM.