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Manipulating data formats of DeePMD-kit, VASP, QE, and LAMMPS, etc.

Project description

dpdata is a python package for manipulating DeePMD-kit, VASP, LAMMPS data formats. dpdata only works with python 3.x.


One can download the source code of dpdata by

git clone dpdata

then use to install the module

cd dpdata
python install

dpdata can also by install via pip

pip3 install dpdata

Quick start

This section gives some examples on how dpdata works. Firstly one needs to import the module in a python 3.x compatible code.

import dpdata

The typicall workflow of dpdata is

  1. Load data from vasp or lammps or deepmd-kit data files.
  2. Manipulate data
  3. Dump data to in a desired format

Load data

d_poscar = dpdata.System('POSCAR', fmt = 'vasp/poscar')

or let dpdata infer the format (vasp/poscar) of the file from the file name extension

d_poscar = dpdata.System('my.POSCAR')

The number of atoms, atom types, coordinates are loaded from the POSCAR and stored to a data System called d_poscar. A data System (a concept used by deepmd-kit) contains frames that has the same number of atoms of the same type. The order of the atoms should be consistent among the frames in one System. It is noted that POSCAR only contains one frame. If the multiple frames stored in, for example, a OUTCAR is wanted,

d_outcar = dpdata.LabeledSystem('OUTCAR')

The labels provided in the OUTCAR, i.e. energies, forces and virials (if any), are loaded by LabeledSystem. It is noted that the forces of atoms are always assumed to exist. LabeledSystem is a derived class of System.

The System or LabeledSystem can be constructed from the following file formats with the format key in the table passed to argument fmt:

Software format multi frames labeled class format key
vasp poscar False False System ‘vasp/poscar’
vasp outcar True True LabeledSystem ‘vasp/outcar’
vasp xml True True LabeledSystem ‘vasp/xml’
lammps lmp False False System ‘lammps/lmp’
lammps dump True False System ‘lammps/dump’
deepmd raw True False System ‘deepmd/raw’
deepmd npy True False System ‘deepmd/npy’
deepmd raw True True LabeledSystem ‘deepmd/raw’
deepmd npy True True LabeledSystem ‘deepmd/npy’
gaussian log False True LabeledSystem ‘gaussian/log’
gaussian log True True LabeledSystem ‘gaussian/md’
siesta output False True LabeledSystem ‘siesta/output’
siesta aimd_output True True LabeledSystem ‘siesta/aimd_output’
cp2k output False True LabeledSystem ‘cp2k/output’
QE log False True LabeledSystem ‘qe/pw/scf’
QE log True False System ‘qe/cp/traj’
QE log True True LabeledSystem ‘qe/cp/traj’

Access data

These properties stored in System and LabeledSystem can be accessed by operator [] with the key of the property supplied, for example

coords = d_outcar['coords']

Available properties are (nframe: number of frames in the system, natoms: total number of atoms in the system)

key type dimension are labels description
‘atom_names’ list of str ntypes False The name of each atom type
‘atom_numbs’ list of int ntypes False The number of atoms of each atom type
‘atom_types’ np.ndarray natoms False Array assigning type to each atom
‘cells’ np.ndarray nframes x 3 x 3 False The cell tensor of each frame
‘coords’ np.ndarray nframes x natoms x 3 False The atom coordinates
‘energies’ np.ndarray nframes True The frame energies
‘forces’ np.ndarray nframes x natoms x 3 True The atom forces
‘virials’ np.ndarray nframes x 3 x 3 True The virial tensor of each frame

Dump data

The data stored in System or LabeledSystem can be dumped in ‘lammps/lmp’ or ‘vasp/poscar’ format, for example:

d_outcar.to_lammps_lmp('conf.lmp', frame_idx=0)

The first frames of d_outcar will be dumped to ‘conf.lmp’

d_outcar.to_vasp_poscar('POSCAR', frame_idx=-1)

The last frames of d_outcar will be dumped to ‘POSCAR’.

The data stored in LabeledSystem can be dumped to deepmd-kit raw format, for example


Or a simpler command:


Frame selection can be implemented by


by which only the first and last frames are dumped to dpmd_raw.

Project details

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