CBFV.jl : A simple composition-based feature vectorization utility in Julia

This is a Julia rewrite of the python tool to create a composition-based feature vector representation for machine learning with materials science data. The ideas and methodology are discussed in the recent article:

Wang, Anthony Yu-Tung; Murdock, Ryan J.; Kauwe, Steven K.; Oliynyk, Anton O.; Gurlo, Aleksander; Brgoch, Jakoah; Persson, Kristin A.; Sparks, Taylor D., Machine Learning for Materials Scientists: An Introductory Guide toward Best Practices, Chemistry of Materials 2020, 32 (12): 4954–4965. DOI: 10.1021/acs.chemmater.0c01907.

and the original python source code(s) can be found here:

• https://github.com/anthony-wang/BestPractices/tree/master/notebooks/CBFV
• https://github.com/kaaiian/CBFV

The input data set should have a least two columns with the header/names formula and target.

using DataFrames
using CBFV
data = DataFrame("name"=>["Rb2Te","CdCl2","LaN"],"bandgap_eV"=>[1.88,3.51,1.12])
rename!(data,Dict("name"=>"formula","bandgap_eV"=>"target"))
features = generatefeatures(data)

The thing to note is you most likely will still want to post-process the generated feature data using some transformation to scale the data. The StatsBase.jl package provides some basic fetures for this, although the input needs to be AbstractMatrix{<:Real} rather than a DataFrame. This can be achieved using generatefeatures(data,returndataframe=false)

As with the orignal CBFV python package the following element databases are available:

• oliynyk (default): Database from A. Oliynyk.
• magpie: Materials Agnostic Platform for Informatics and Exploration
• mat2vec: Word embeddings capture latent knowledge from materials science
• jarvis: Joint Automated Repository for Various Integrated Simulations provided by U.S. National Institutes of Standards and Technologies.
• onehot: Simple one hot encoding scheme, i.e., diagonal elemental matrix.
• random_200: 200 random elemental properties (I'm assuming).

However, CBFV.jl will allow you to provide your own element database to featurize with. Also, the current implementation reads the saved .csv file in databases, however, this is prone to potential issues (ex. out of date files). To alleviate this I will change the implementation to utilize Pkg.Artificats with a Artificats.toml file that enables grabbing the datafiles needed from a server if they don't exist locally already.

This is a relatively small package so there aren't a lot of dependencies. The required packages are:

• CSV
• DataFrames
• ProgressBars

Pleae cite the following when and if you use this package in your work:

@misc{CBFV.jl,
    author = {Bringuier, Stefan},
    year = {2021},
    title = {CBFV.jl - A simple composition based feature vectorization Julia utility},
    url = {https://github.com/JuliaMatSci/CBFV.jl},
}

In addition, please also consider citing the original python implementation and tutorial paper.

@misc{CBFV,
    author = {Kauwe, Steven and Wang, Anthony Yu-Tung and Falkowski, Andrew},
    title = {CBFV: Composition-based feature vectors},
    url = {https://github.com/kaaiian/CBFV}
}

@article{Wang2020bestpractices,
    author = {Wang, Anthony Yu-Tung and Murdock, Ryan J. and Kauwe, Steven K. and Oliynyk, Anton O. and Gurlo, Aleksander and Brgoch, Jakoah and Persson, Kristin A. and Sparks, Taylor D.},
    year = {2020},
    title = {Machine Learning for Materials Scientists: An Introductory Guide toward Best Practices},
    url = {https://doi.org/10.1021/acs.chemmater.0c01907},
    pages = {4954--4965},
    volume = {32},
    number = {12},
    issn = {0897-4756},
    journal = {Chemistry of Materials},
    doi = {10.1021/acs.chemmater.0c01907}
}