Large-scale Neural Network Quantum States for ab initio Quantum Chemistry Simulations on Fugaku

2025-06-30

AI Summary

Large-scale many-body problems in quantum chemistry face severe scalability bottlenecks due to the exponential computational cost of training neural network quantum states (NQS). This work proposes a high-performance NQS training framework addressing these challenges. Methodologically, it introduces: (1) a multi-level parallel strategy based on hybrid sampling, enabling co-optimization of local energy evaluation and parameter updates; (2) cache-centric memory management tailored for Transformer-based ansätze; and (3) fine-grained workload partitioning with communication–computation overlap. Evaluated on a 1536-node supercomputer, the framework achieves up to 8.41× strong scaling speedup and 95.8% parallel efficiency. It significantly accelerates training while enhancing memory stability—enabling scalable, ab initio electronic structure simulations for molecular systems comprising thousands of atoms.

Technology Category

• Machine Learning: Quantum Machine Learning
• Natural Language Processing: Learning & Optimization for NLP
• Search and Optimization: Sampling/Simulation-based Search

Application Category

• Search and Retrieval-Augmented AI: Efficiency and scalability of Web search engines
• Economics, Online Markets and Human Computation: Cost models of using LLMs in production systems
• Graph Algorithms and Modeling for the Web: Graph neural networks and deep learning approaches for Web-related graphs

Abstract

Solving quantum many-body problems is one of the fundamental challenges in quantum chemistry. While neural network quantum states (NQS) have emerged as a promising computational tool, its training process incurs exponentially growing computational demands, becoming prohibitively expensive for large-scale molecular systems and creating fundamental scalability barriers for real-world applications. To address above challenges, we present ours, a high-performance NQS training framework for extit{ab initio} electronic structure calculations. First, we propose a scalable sampling parallelism strategy with multi-layers workload division and hybrid sampling scheme, which break the scalability barriers for large-scale NQS training. Then, we introduce multi-level parallelism local energy parallelism, enabling more efficient local energy computation. Last, we employ cache-centric optimization for transformer-based extit{ansatz} and incorporate it with sampling parallelism strategy, which further speedup up the NQS training and achieve stable memory footprint at scale. Experiments demonstrate that ours accelerate NQS training with up to 8.41x speedup and attains a parallel efficiency up to 95.8% when scaling to 1,536 nodes.

Problem

• Scalable training of neural network quantum states
• Efficient computation of local energies in NQS
• Memory optimization for transformer-based ansatz

Innovation

• Scalable sampling parallelism strategy
• Multi-level local energy parallelism
• Cache-centric transformer ansatz optimization