Question 1

How to add a progress bar to jax.lax.scan?

Accepted Answer

Use the @scan_tqdm decorator with the total iterations as shown in the README: decorate your step function, and ensure the scan input starts at 0. This integrates seamlessly without breaking functional purity.

Question 2

JAX-Tqdm vs standard tqdm for JAX loops?

Accepted Answer

JAX-Tqdm is specifically designed for JAX's functional loops, using debug callbacks to avoid side effects, whereas standard tqdm would violate JAX's purity. It's the go-to for progress tracking in scans and fori_loop without performance hits.

Question 3

Can I use JAX-Tqdm with jax.jit?

Accepted Answer

Yes, but progress bars rely on host callbacks, so they work within jitted functions as long as debug features are enabled. The README notes this is handled via JAX's debug module for side effects.

Question 4

How to customize the update frequency in JAX-Tqdm?

Accepted Answer

Use the print_rate parameter in decorators like @scan_tqdm(n, print_rate=2) to control refresh intervals, balancing visibility and performance, as explained in the 'Print Rate' section.

Question 5

Does JAX-Tqdm work with parallel computations using vmap?

Accepted Answer

Yes, it supports vmap with stacked progress bars by wrapping initial values in the PBar class and ensuring contiguous indices, detailed in the 'Scans & Loops Inside Vmap' example.

Question 6

What are the performance implications of using JAX-Tqdm?

Accepted Answer

Minimal by default, with only 20 updates per loop, but increasing print_rate or adding many bars in vmap can add overhead. The library is optimized to avoid significant slowdowns in most cases.

jax-tqdm

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