Quantities in JAX
Project description
unxt
Unitful Quantities in JAX
Unxt is unitful quantities and calculations in JAX, built on Equinox and Quax.
Yes, it supports auto-differentiation (grad, jacobian, hessian) and
vectorization (vmap, etc).
Installation
pip install unxt
Documentation
Coming soon. In the meantime, if you've used astropy.units, then unxt should
be familiar!
Quick example
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, which
enables custom array-ish objects in JAX. For convenience we use the
quaxed library, which is just a quax
wrapper around jax to avoid boilerplate wrappers.
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!
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
If you found this library to be useful in academic work, then please cite.
Development
We welcome contributions!
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