- flare
    - Python source code for the on-the-fly training of melting stanene. This is an out-dated version, which was used to train on-the-fly the stanene system reported in the paper. 
    - For the most recent version, please visit https://github.com/mir-group/flare
    - The on-the-fly training of bulk data (alpha, beta, bcc phases), and convergence test are from a newer version of flare, please see commit adca6a8153f38cfa9ccb0787a2fee2fc484593aa of the github repository

- Data
    frames of training data and testing data of stanene and bulk tin, extracted from on-the-fly active learning and hierarchical training

- Models
    GP models and corresponding MGP coefficient files for LAMMPS of the stanene and bulk system

- LMP
    - LAMMPS source code of MGP pair style, includes an out-dated version of force mapping, and a most recent version of energy mapping
    - For the most recent version, please visit https://github.com/mir-group/flare

- MD
    - LAMMPS molecular dynamics of 2D-bulk and 2D-liquid transition
    - Ab-initio molecular dynamics of liquid tin