52 citations · 82 across the 8 of their papers we have counts for
8 papers
A Parallelizable Energy-Preserving Integrator MB4 and Its Application to Quantum-Mechanical Wavepacket Dynamics
Tsubasa Sakai, Shuhei Kudo, Hiroto Imachi +3
In simulating physical systems, conservation of the total energy is often essential, especially when energy conversion between different forms of energy occurs frequently. Recently…
Numerical aspect of large-scale electronic state calculation for flexible device material
Takeo Hoshi, Hiroto Imachi, Akiyoshi Kuwata +3
Numerical aspects of large-scale electronic state calculation are explored on flexible organic device materials. Physical theory, numerical method and real application studies are…
EigenKernel - A middleware for parallel generalized eigenvalue solvers to attain high scalability and usability
Kazuyuki Tanaka, Hiroto Imachi, Tomoya Fukumoto +5
An open-source middleware EigenKernel was developed for use with parallel generalized eigenvalue solvers or large-scale electronic state calculation to attain high scalability and…
Variance-based Gradient Compression for Efficient Distributed Deep Learning
Yusuke Tsuzuku, Hiroto Imachi, Takuya Akiba
Due to the substantial computational cost, training state-of-the-art deep neural networks for large-scale datasets often requires distributed training using multiple computation wo…
Extremely scalable algorithm for 10-atom quantum material simulation on the full system of the K computer
Takeo Hoshi, Hiroto Imachi, Kiyoshi Kumahata +4
An extremely scalable linear-algebraic algorithm was developed for quantum material simulation (electronic state calculation) with 10 atoms or 100-nm-scale materials. The mathe…
One-hundred-nm-scale electronic structure and transport calculations of organic polymers on the K computer
Hiroto Imachi, Seiya Yokoyama, Takami Kaji +3
One-hundred-nm-scale electronic structure calculations were carried out on the K supercomputer by our original simulation code ELSES (http://www.elses.jp/) The present paper report…
Hybrid Numerical Solvers for Massively Parallel Eigenvalue Computation and Their Benchmark with Electronic Structure Calculations
Hiroto Imachi, Takeo Hoshi
Optimally hybrid numerical solvers were constructed for massively parallel generalized eigenvalue problem (GEP).The strong scaling benchmark was carried out on the K computer and o…
Novel linear algebraic theory and one-hundred-million-atom quantum material simulations on the K computer
Takeo Hoshi, Tomohiro Sogabe, Takafumi Miyatad +7
The present paper gives a review of our recent progress and latest results for novel linear-algebraic algorithms and its application to large-scale quantum material simulations or…