# JAX-tqdm
Add a [tqdm](https://github.com/tqdm/tqdm) progress bar to your JAX scans and loops.
## Installation
Install with pip:
```bash
pip install jax-tqdm
```
## Example usage
### in `jax.lax.scan`
```python
from jax_tqdm import scan_tqdm
from jax import lax
import jax.numpy as jnp
n = 10_000
@scan_tqdm(n)
def step(carry, x):
return carry + 1, carry + 1
last_number, all_numbers = lax.scan(step, 0, jnp.arange(n))
```
### in `jax.lax.fori_loop`
```python
from jax_tqdm import loop_tqdm
from jax import lax
n = 10_000
@loop_tqdm(n)
def step(i, val):
return val + 1
last_number = lax.fori_loop(0, n, step, 0)
```
### Print Rate
By default, the progress bar is updated 20 times over the course of the scan/loop
(for performance purposes, see [below](#why-jax-tqdm)). This
update rate can be manually controlled with the `print_rate` keyword argument. For
example:
```python
from jax_tqdm import scan_tqdm
from jax import lax
import jax.numpy as jnp
n = 10_000
@scan_tqdm(n, print_rate=2)
def step(carry, x):
return carry + 1, carry + 1
last_number, all_numbers = lax.scan(step, 0, jnp.arange(n))
```
will update every other step.
### Progress bar options
Any additional keyword arguments are passed to the [tqdm](https://github.com/tqdm/tqdm)
progress bar constructor. For example:
```python
from jax_tqdm import scan_tqdm
from jax import lax
import jax.numpy as jnp
n = 10_000
@scan_tqdm(n, print_rate=1, desc='progress bar', position=0, leave=False)
def step(carry, x):
return carry + 1, carry + 1
last_number, all_numbers = lax.scan(step, 0, jnp.arange(n))
```
## Why JAX-tqdm?
JAX functions are [pure](https://jax.readthedocs.io/en/latest/notebooks/Common_Gotchas_in_JAX.html#pure-functions),
so side effects such as printing progress when running scans and loops are not allowed.
However, the
[debug module](https://jax.readthedocs.io/en/latest/notebooks/external_callbacks.html#exploring-debug-callback)
has primitives for calling Python functions on the host from JAX code. This can be used
to update a Python tqdm progress bar regularly during the computation. JAX-tqdm
implements this for JAX scans and loops and is used by simply adding a decorator to the
body of your update function.
Note that as the tqdm progress bar is only updated 20 times during the scan or loop,
there is no performance penalty.
The code is explained in more detail in this [blog post](https://www.jeremiecoullon.com/2021/01/29/jax_progress_bar/).
## Developers
Dependencies can be installed with [poetry](https://python-poetry.org/) by running
```bash
poetry install
```
### Pre-Commit Hooks
Pre commit hooks can be installed by running
```bash
pre-commit install
```
Pre-commit checks can then be run using
```bash
task lint
```
### Tests
Tests can be run with
```bash
task test
```
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