AutoHOOT: Automatic High-Order Optimization for Tensors

TL;DR

AutoHOOT is an innovative automatic differentiation framework designed for high-order tensor optimization, enhancing performance and scalability in tensor decomposition and network applications.

Contribution

AutoHOOT introduces the first AD framework for high-order tensor optimization, with a new kernel for explicit Jacobian/Hessian generation and optimized tensor algebra transformations.

Findings

Achieves competitive CPU and GPU performance.

Demonstrates good scalability on distributed supercomputers.

Produces tensor methods that are highly parallelizable.

Abstract

High-order optimization methods, including Newton's method and its variants as well as alternating minimization methods, dominate the optimization algorithms for tensor decompositions and tensor networks. These tensor methods are used for data analysis and simulation of quantum systems. In this work, we introduce AutoHOOT, the first automatic differentiation (AD) framework targeting at high-order optimization for tensor computations. AutoHOOT takes input tensor computation expressions and generates optimized derivative expressions. In particular, AutoHOOT contains a new explicit Jacobian / Hessian expression generation kernel whose outputs maintain the input tensors' granularity and are easy to optimize. The expressions are then optimized by both the traditional compiler optimization techniques and specific tensor algebra transformations. Experimental results show that AutoHOOT achieves competitive CPU and GPU performance for both tensor decomposition and tensor network applications compared to existing AD software and other tensor computation libraries with manually written kernels. The tensor methods generated by AutoHOOT are also well-parallelizable, and we demonstrate good scalability on a distributed memory supercomputer.