Implementation of the DFT-D3 dispersion model in PyTorch. This module allows to process a single structure or a batch of structures for the calculation of atom-resolved dispersion energies.
For details on the D3 dispersion model see
For alternative implementations also check out
- simple-dftd3:
- Simple reimplementation of the DFT-D3 dispersion model in Fortran with Python bindings
- torch-dftd:
- PyTorch implementation of DFT-D2 and DFT-D3
- dispax:
- Implementation of the DFT-D3 dispersion model in Jax M.D.
The project can easily be installed with pip.
pip install tad-dftd3
tad-dftd3 is also available from conda.
conda install tad-dftd3
This project is hosted on GitHub at dftd3/tad-dftd3. Obtain the source by cloning the repository with
git clone https://github.com/dftd3/tad-dftd3 cd tad-dftd3
We recommend using a conda environment to install the package. You can setup the environment manager using a mambaforge installer. Install the required dependencies from the conda-forge channel.
mamba env create -n torch -f environment.yml mamba activate torch
Install this project with pip in the environment
pip install .
The following dependencies are required
For development, additionally install the following tools in your environment.
mamba install black covdefaults mypy pre-commit pylint pytest pytest-cov pytest-xdist tox pip install pytest-random-order
With pip, add the option -e for installing in development mode, and add [dev] for the development dependencies
pip install -e .[dev]
The pre-commit hooks are initialized by running the following command in the root of the repository.
pre-commit install
For testing all Python environments, simply run tox.
tox
Note that this randomizes the order of tests but skips "large" tests. To modify this behavior, tox has to skip the optional posargs.
tox -- test
The following example shows how to calculate the DFT-D3 dispersion energy for a single structure.
import torch
import tad_dftd3 as d3
import tad_mctc as mctc
numbers = mctc.convert.symbol_to_number(symbols="C C C C N C S H H H H H".split())
positions = torch.tensor(
[
[-2.56745685564671, -0.02509985979910, 0.00000000000000],
[-1.39177582455797, +2.27696188880014, 0.00000000000000],
[+1.27784995624894, +2.45107479759386, 0.00000000000000],
[+2.62801937615793, +0.25927727028120, 0.00000000000000],
[+1.41097033661123, -1.99890996077412, 0.00000000000000],
[-1.17186102298849, -2.34220576284180, 0.00000000000000],
[-2.39505990368378, -5.22635838332362, 0.00000000000000],
[+2.41961980455457, -3.62158019253045, 0.00000000000000],
[-2.51744374846065, +3.98181713686746, 0.00000000000000],
[+2.24269048384775, +4.24389473203647, 0.00000000000000],
[+4.66488984573956, +0.17907568006409, 0.00000000000000],
[-4.60044244782237, -0.17794734637413, 0.00000000000000],
]
)
param = {
"a1": torch.tensor(0.49484001),
"s8": torch.tensor(0.78981345),
"a2": torch.tensor(5.73083694),
}
energy = d3.dftd3(numbers, positions, param)
torch.set_printoptions(precision=10)
print(energy)
# tensor([-0.0004075971, -0.0003940886, -0.0003817684, -0.0003949536,
# -0.0003577212, -0.0004110279, -0.0005385976, -0.0001808242,
# -0.0001563670, -0.0001503394, -0.0001577045, -0.0001764488])The next example shows the calculation of dispersion energies for a batch of structures, while retaining access to all intermediates used for calculating the dispersion energy.
import torch
import tad_dftd3 as d3
import tad_mctc as mctc
sample1 = dict(
numbers=mctc.convert.symbol_to_number("Pb H H H H Bi H H H".split()),
positions=torch.tensor(
[
[-0.00000020988889, -4.98043478877778, +0.00000000000000],
[+3.06964045311111, -6.06324400177778, +0.00000000000000],
[-1.53482054188889, -6.06324400177778, -2.65838526500000],
[-1.53482054188889, -6.06324400177778, +2.65838526500000],
[-0.00000020988889, -1.72196703577778, +0.00000000000000],
[-0.00000020988889, +4.77334244722222, +0.00000000000000],
[+1.35700257511111, +6.70626379422222, -2.35039772300000],
[-2.71400388988889, +6.70626379422222, +0.00000000000000],
[+1.35700257511111, +6.70626379422222, +2.35039772300000],
]
),
)
sample2 = dict(
numbers=mctc.convert.symbol_to_number(
"C C C C C C I H H H H H S H C H H H".split(" ")
),
positions=torch.tensor(
[
[-1.42754169820131, -1.50508961850828, -1.93430551124333],
[+1.19860572924150, -1.66299114873979, -2.03189643761298],
[+2.65876001301880, +0.37736955363609, -1.23426391650599],
[+1.50963368042358, +2.57230374419743, -0.34128058818180],
[-1.12092277855371, +2.71045691257517, -0.25246348639234],
[-2.60071517756218, +0.67879949508239, -1.04550707592673],
[-2.86169588073340, +5.99660765711210, +1.08394899986031],
[+2.09930989272956, -3.36144811062374, -2.72237695164263],
[+2.64405246349916, +4.15317840474646, +0.27856972788526],
[+4.69864865613751, +0.26922271535391, -1.30274048619151],
[-4.63786461351839, +0.79856258572808, -0.96906659938432],
[-2.57447518692275, -3.08132039046931, -2.54875517521577],
[-5.88211879210329, 11.88491819358157, +2.31866455902233],
[-8.18022701418703, 10.95619984550779, +1.83940856333092],
[-5.08172874482867, 12.66714386256482, -0.92419491629867],
[-3.18311711399702, 13.44626574330220, -0.86977613647871],
[-5.07177399637298, 10.99164969235585, -2.10739192258756],
[-6.35955320518616, 14.08073002965080, -1.68204314084441],
]
),
)
numbers = mctc.batch.pack(
(
sample1["numbers"],
sample2["numbers"],
)
)
positions = mctc.batch.pack(
(
sample1["positions"],
sample2["positions"],
)
)
ref = d3.reference.Reference()
rcov = d3.data.COV_D3[numbers]
rvdw = d3.data.VDW_D3[numbers.unsqueeze(-1), numbers.unsqueeze(-2)]
r4r2 = d3.data.R4R2[numbers]
param = {
"a1": torch.tensor(0.49484001),
"s8": torch.tensor(0.78981345),
"a2": torch.tensor(5.73083694),
}
cn = mctc.ncoord.cn_d3(
numbers, positions, counting_function=mctc.ncoord.exp_count, rcov=rcov
)
weights = d3.model.weight_references(numbers, cn, ref, d3.model.gaussian_weight)
c6 = d3.model.atomic_c6(numbers, weights, ref)
energy = d3.disp.dispersion(
numbers,
positions,
param,
c6,
rvdw,
r4r2,
d3.disp.rational_damping,
)
torch.set_printoptions(precision=10)
print(torch.sum(energy, dim=-1))
# tensor([-0.0014092578, -0.0057840119])This is a volunteer open source projects and contributions are always welcome. Please, take a moment to read the contributing guidelines.
Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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