# PyTorch-based Libcint Interface
<table>
<tr>
<td>Compatibility:</td>
<td>
<img src="https://img.shields.io/badge/Python-3.8%20|%203.9%20|%203.10%20|%203.11%20|%203.12-blue.svg" alt="Python Versions"/>
<img src="https://img.shields.io/badge/PyTorch-%3E=1.11.0-blue.svg" alt="PyTorch Versions"/>
<img src="https://img.shields.io/badge/OS-Linux-blue.svg" alt="Operating Systems">
</td>
</tr>
<tr>
<td>Availability:</td>
<td>
<a href="https://github.com/tad-mctc/tad-libcint/releases/latest">
<img src="https://img.shields.io/github/v/release/tad-mctc/tad-libcint?color=orange" alt="Release"/>
</a>
<a href="https://pypi.org/project/tad-libcint/">
<img src="https://img.shields.io/pypi/v/tad-libcint?color=orange" alt="PyPI"/>
</a>
<a href="http://www.apache.org/licenses/LICENSE-2.0">
<img src="https://img.shields.io/badge/License-Apache%202.0-orange.svg" alt="Apache-2.0"/>
</a>
</td>
</tr>
<tr>
<td>Status:</td>
<td>
<a href="https://github.com/tad-mctc/tad-libcint/actions/workflows/ubuntu.yaml">
<img src="https://github.com/tad-mctc/tad-libcint/actions/workflows/ubuntu.yaml/badge.svg" alt="Tests Ubuntu"/>
</a>
<a href="https://github.com/tad-mctc/tad-libcint/actions/workflows/release.yaml">
<img src="https://github.com/tad-mctc/tad-libcint/actions/workflows/release.yaml/badge.svg" alt="Build Status"/>
</a>
<a href="https://tad-libcint.readthedocs.io">
<img src="https://readthedocs.org/projects/tad-libcint/badge/?version=latest" alt="Documentation Status"/>
</a>
<a href="https://results.pre-commit.ci/latest/github/tad-mctc/tad-libcint/main">
<img src="https://results.pre-commit.ci/badge/github/tad-mctc/tad-libcint/main.svg" alt="pre-commit.ci Status"/>
</a>
<a href="https://codecov.io/gh/tad-mctc/tad-libcint">
<img src="https://codecov.io/gh/tad-mctc/tad-libcint/branch/main/graph/badge.svg?token=9faLOhisRx" alt="Coverage"/>
</a>
</td>
</tr>
</table>
## Content
This package contains a PyTorch-based interface to the *[libcint](https://github.com/sunqm/libcint)* high-performance integral library (check version [here](https://github.com/tad-mctc/libcint/blob/dxtb/README.rst)).
The interface facilitates automatic differentiation with custom backward functions that call *libcint*'s C backend for derivative calculation.
It is based on [PySCF's lib directory](https://github.com/pyscf/pyscf/tree/master/pyscf/lib). Modifications include
- removal of unnecessary code
- minor adaptation of build instructions (CMakeLists.txt)
The project was heavily inspired by *[diffqc/dqc](https://github.com/diffqc/dqc)* and *[diffqc/dqclibs](https://github.com/diffqc/dqclibs)*.
This interface was mainly written for the calculation of integrals within *[grimme-lab/dxtb](https://github.com/grimme-lab/dxtb)*.
## Installation
### pip
The `tad-libcint` package can be obtained from pip.
```console
pip install tad-libcint
```
### Build from source
You can also build the Python wheels from source.
1. Get the repository (including libcint submodule).
```console
git clone --recursive git@github.com:tad-mctc/tad-libcint.git
cd tad-libcint
```
The [libcint fork](https://github.com/tad-mctc/libcint/tree/dxtb) contains additional integrals required for `dxtb` and removes unneccessary ones.
Therefore, downloading from our fork is recommended.
If you already have the repository, you can update the submodule with
```console
git submodule update --remote
```
2. Create an environment (`conda`) for building the wheels. The example here uses Python 3.10, but we support 3.8-3.11.
```console
mamba create -n wheel-310 --yes python=3.10 auditwheel c-compiler cxx-compiler fortran-compiler cffi cmake git make meson ninja numpy patchelf pkgconfig pip python-build unzip wheel
mamba activate wheel-310
```
3. Build the wheel on your system.
```console
python -m build --wheel
```
4. Repair the wheels for cross-distribution packaging.
```console
auditwheel repair -w wheels --plat manylinux_2_12_x86_64 dist/*-cp310-cp310-linux_x86_64.whl
```
5. Or only install this project with `pip` in the environment.
```console
pip install .
```
## Development
For development, additionally install the following tools in your environment.
```console
mamba install black covdefaults coverage mypy pre-commit pylint tox
```
With pip, add the option `-e` for installing in development mode, and add `[dev]` for the development dependencies
```console
pip install -e .[dev]
```
The pre-commit hooks are initialized by running the following command in the root of the repository.
```console
pre-commit install
```
For testing all Python environments, simply run `tox`.
```console
tox
```
Note that this randomizes the order of tests but skips "large" tests. To modify this behavior, `tox` has to skip the optional *posargs*.
```console
tox -- test
```
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"description": "# PyTorch-based Libcint Interface\n\n<table>\n <tr>\n <td>Compatibility:</td>\n <td>\n <img src=\"https://img.shields.io/badge/Python-3.8%20|%203.9%20|%203.10%20|%203.11%20|%203.12-blue.svg\" alt=\"Python Versions\"/>\n <img src=\"https://img.shields.io/badge/PyTorch-%3E=1.11.0-blue.svg\" alt=\"PyTorch Versions\"/>\n <img src=\"https://img.shields.io/badge/OS-Linux-blue.svg\" alt=\"Operating Systems\">\n </td>\n </tr>\n <tr>\n <td>Availability:</td>\n <td>\n <a href=\"https://github.com/tad-mctc/tad-libcint/releases/latest\">\n <img src=\"https://img.shields.io/github/v/release/tad-mctc/tad-libcint?color=orange\" alt=\"Release\"/>\n </a>\n <a href=\"https://pypi.org/project/tad-libcint/\">\n <img src=\"https://img.shields.io/pypi/v/tad-libcint?color=orange\" alt=\"PyPI\"/>\n </a>\n <a href=\"http://www.apache.org/licenses/LICENSE-2.0\">\n <img src=\"https://img.shields.io/badge/License-Apache%202.0-orange.svg\" alt=\"Apache-2.0\"/>\n </a>\n </td>\n </tr>\n <tr>\n <td>Status:</td>\n <td>\n <a href=\"https://github.com/tad-mctc/tad-libcint/actions/workflows/ubuntu.yaml\">\n <img src=\"https://github.com/tad-mctc/tad-libcint/actions/workflows/ubuntu.yaml/badge.svg\" alt=\"Tests Ubuntu\"/>\n </a>\n <a href=\"https://github.com/tad-mctc/tad-libcint/actions/workflows/release.yaml\">\n <img src=\"https://github.com/tad-mctc/tad-libcint/actions/workflows/release.yaml/badge.svg\" alt=\"Build Status\"/>\n </a>\n <a href=\"https://tad-libcint.readthedocs.io\">\n <img src=\"https://readthedocs.org/projects/tad-libcint/badge/?version=latest\" alt=\"Documentation Status\"/>\n </a>\n <a href=\"https://results.pre-commit.ci/latest/github/tad-mctc/tad-libcint/main\">\n <img src=\"https://results.pre-commit.ci/badge/github/tad-mctc/tad-libcint/main.svg\" alt=\"pre-commit.ci Status\"/>\n </a>\n <a href=\"https://codecov.io/gh/tad-mctc/tad-libcint\">\n <img src=\"https://codecov.io/gh/tad-mctc/tad-libcint/branch/main/graph/badge.svg?token=9faLOhisRx\" alt=\"Coverage\"/>\n </a>\n </td>\n </tr>\n</table>\n\n\n## Content\n\nThis package contains a PyTorch-based interface to the *[libcint](https://github.com/sunqm/libcint)* high-performance integral library (check version [here](https://github.com/tad-mctc/libcint/blob/dxtb/README.rst)).\nThe interface facilitates automatic differentiation with custom backward functions that call *libcint*'s C backend for derivative calculation.\n\nIt is based on [PySCF's lib directory](https://github.com/pyscf/pyscf/tree/master/pyscf/lib). Modifications include\n\n- removal of unnecessary code\n- minor adaptation of build instructions (CMakeLists.txt)\n\nThe project was heavily inspired by *[diffqc/dqc](https://github.com/diffqc/dqc)* and *[diffqc/dqclibs](https://github.com/diffqc/dqclibs)*.\n\nThis interface was mainly written for the calculation of integrals within *[grimme-lab/dxtb](https://github.com/grimme-lab/dxtb)*.\n\n\n## Installation\n\n### pip\n\nThe `tad-libcint` package can be obtained from pip.\n\n```console\npip install tad-libcint\n```\n\n### Build from source\n\nYou can also build the Python wheels from source.\n\n1. 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