rsspolymlp 0.1.8

A framework for random structure search using polynomial MLPs

A framework for random structure search (RSS) using polynomial MLPs

Citation of rsspolymlp

If you use rsspolymlp in your study, please cite the following articles.

“Efficient global crystal structure prediction using polynomial machine learning potential in the binary Al–Cu alloy system”, J. Ceram. Soc. Jpn. 131, 762 (2023)

@article{HayatoWakai202323053,
  title="{Efficient global crystal structure prediction using polynomial machine learning potential in the binary Al–Cu alloy system}",
  author={Hayato Wakai and Atsuto Seko and Isao Tanaka},
  journal={J. Ceram. Soc. Jpn.},
  volume={131},
  number={10},
  pages={762-766},
  year={2023},
  doi={10.2109/jcersj2.23053}
}

Installation

Required libraries and python modules

• python >= 3.9
• scikit-learn
• joblib
• pypolymlp
• spglib
• symfc

[Optional]

• matplotlib (if plotting RSS results)
• seaborn (if plotting RSS results)

How to install

• Install from conda-forge

Name	Downloads	Version	Platforms

conda create -n rsspolymlp
conda activate rsspolymlp
conda install -c conda-forge rsspolymlp

• Install from PyPI

conda create -n rsspolymlp
conda activate rsspolymlp
conda install -c conda-forge scikit-learn joblib pypolymlp spglib symfc
pip install rsspolymlp

Workflow

The command-line interface of rsspolymlp

First, RSS using the polynomial MLP is independently performed for each condition defined by pressure (p), composition (c), and number of atoms (n).

1. Generating initial random structures

   rss-init-struct --elements Al Cu --atom_counts 4 4 --num_init_str 2000
   

2. Performing parallel geometry optimization using the polynomial MLP

   rss-parallel --pot polymlp.yaml --pressure 0.0 --num_opt_str 1000
   

3. Eliminating duplicate structures

   This step processes the optimized structures. It includes:

   • Parsing optimization logs, filtering out failed or unconverged cases, and generating detailed computational summaries.
   • Removing duplicate structures and extracting unique optimized structures.

   rss-uniq-struct
   

Next, RSS results aggregated for each (p, c) condition are analyzed.

4. Identifying unique structures across atom numbers n

   rss-summarize --elements Al Cu --result_paths <rss_directory>/*
   # <rss_directory>: parent directory of RSS runs at the same pressure
   

5. Eliminating ghost minimum structures

   Identifying and filtering out ghost minimum structures based on nearest-neighbor distance are performed.

   rss-ghost-minima --result_paths <summary_dir>/json/*
   rss-ghost-minima --compare_dft --dft_dir <summary_dir>/ghost_minima_dft
   # <summary_dir>: output directory from rss-summarize, storing RSS results
   

6. Phase stability analysis

   This step computes the relative or formation energies of structures obtained from the RSS and outputs the global minimum structures. It also identifies metastable structures near the convex hull based on a energy threshold (e.g., 30 meV/atom).

   rss-phase-analysis --elements Al Cu --result_paths <summary_dir>/json/* 
   --thresholds 10 30 50 --ghost_minima_file <summary_dir>/ghost_minima/ghost_minima_detection.yaml
   

7. (Optional) Plotting RSS results (e.g., plot-binary)

   The energy distribution of structures obtained through this RSS workflow is visualized.

   plot-binary --elements Al Cu --threshold 30
   

Additional information

• Python API (RSS)
  • Initial structure generation
  • Global RSS with polynomial MLPs
  • Unique structure identification and RSS summary generation
• VASP calculation utility
  • Single-point calculation
  • Local geometry optimizaion
• matplotlib utility