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https://github.com/galacticdynamics/unxt
Unitful Quantities in JAX
https://github.com/galacticdynamics/unxt
array auto-differentiation jax quantities units
Last synced: 4 days ago
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Unitful Quantities in JAX
- Host: GitHub
- URL: https://github.com/galacticdynamics/unxt
- Owner: GalacticDynamics
- License: bsd-3-clause
- Created: 2023-12-22T22:13:31.000Z (11 months ago)
- Default Branch: main
- Last Pushed: 2024-10-29T12:33:40.000Z (22 days ago)
- Last Synced: 2024-10-29T14:59:11.831Z (22 days ago)
- Topics: array, auto-differentiation, jax, quantities, units
- Language: Python
- Homepage: https://unxt.readthedocs.io/
- Size: 1.1 MB
- Stars: 13
- Watchers: 1
- Forks: 3
- Open Issues: 16
-
Metadata Files:
- Readme: README.md
- Contributing: .github/CONTRIBUTING.md
- License: LICENSE
Awesome Lists containing this project
README
unxt
Unitful Quantities in JAX
Unxt is unitful quantities and calculations in [JAX][jax], built on
[Equinox][equinox] and [Quax][quax].
Yes, it supports auto-differentiation (`grad`, `jacobian`, `hessian`) and
vectorization (`vmap`, etc).
## Installation
[![PyPI version][pypi-version]][pypi-link]
[![PyPI platforms][pypi-platforms]][pypi-link]
```bash
pip install unxt
```
## [Documentation][rtd-link]
[![Documentation Status][rtd-badge]][rtd-link]
### Quick example
```python
from unxt import Quantity
x = Quantity(jnp.arange(1, 5, dtype=float), "kpc")
print(x)
# Quantity['length'](Array([1., 2., 3., 4.], dtype=float64), unit='kpc')
# Addition / Subtraction
print(x + x)
# Quantity['length'](Array([2., 4., 6., 8.], dtype=float64), unit='kpc')
# Multiplication / Division
print(2 * x)
# Quantity['length'](Array([2., 4., 6., 8.], dtype=float64), unit='kpc')
y = Quantity(jnp.arange(4, 8, dtype=float), "Gyr")
print(x / y)
# Quantity['speed'](Array([0.25 , 0.4 , 0.5 , 0.57142857], dtype=float64), unit='kpc / Gyr')
# Exponentiation
print(x**2)
# Quantity['area'](Array([0., 1., 4., 9.], dtype=float64), unit='kpc2')
# Unit Checking on operations
try:
x + y
except Exception as e:
print(e)
# 'Gyr' (time) and 'kpc' (length) are not convertible
```
`unxt` is built on [`quax`](https://github.com/patrick-kidger/quax), which
enables custom array-ish objects in JAX. For convenience we use the
[`quaxed`](https://pypi.org/project/quaxed/) library, which is just a
`quax.quaxify` wrapper around `jax` to avoid boilerplate code.
```python
from quaxed import grad, vmap
import quaxed.numpy as jnp
print(jnp.square(x))
# Quantity['area'](Array([ 1., 4., 9., 16.], dtype=float64), unit='kpc2')
print(qnp.power(x, 3))
# Quantity['volume'](Array([ 1., 8., 27., 64.], dtype=float64), unit='kpc3')
print(vmap(grad(lambda x: x**3))(x))
# Quantity['area'](Array([ 3., 12., 27., 48.], dtype=float64), unit='kpc2')
```
Since `Quantity` is parametric, it can do runtime dimension checking!
```python
LengthQuantity = Quantity["length"]
print(LengthQuantity(2, "km"))
# Quantity['length'](Array(2, dtype=int64, weak_type=True), unit='km')
try:
LengthQuantity(2, "s")
except ValueError as e:
print(e)
# Physical type mismatch.
```
## Citation
[![DOI][zenodo-badge]][zenodo-link]
If you found this library to be useful and want to support the development and
maintenance of lower-level code libraries for the scientific community, please
consider citing this work.
## Development
[![codecov][codecov-badge]][codecov-link]
[![Actions Status][actions-badge]][actions-link]
We welcome contributions!
[equinox]: https://docs.kidger.site/equinox/
[jax]: https://jax.readthedocs.io/en/latest/
[quax]: https://github.com/patrick-kidger/quax
[actions-badge]: https://github.com/GalacticDynamics/unxt/workflows/CI/badge.svg
[actions-link]: https://github.com/GalacticDynamics/unxt/actions
[codecov-badge]: https://codecov.io/gh/GalacticDynamics/unxt/graph/badge.svg
[codecov-link]: https://codecov.io/gh/GalacticDynamics/unxt
[pypi-link]: https://pypi.org/project/unxt/
[pypi-platforms]: https://img.shields.io/pypi/pyversions/unxt
[pypi-version]: https://img.shields.io/pypi/v/unxt
[rtd-badge]: https://readthedocs.org/projects/unxt/badge/?version=latest
[rtd-link]: https://unxt.readthedocs.io/en/latest/?badge=latest
[zenodo-badge]: https://zenodo.org/badge/734877295.svg
[zenodo-link]: https://zenodo.org/doi/10.5281/zenodo.10850455