Is progress bar in marimo broken for everyone with v6.0.0, or it's just me?

1 
with pm.observe(m_hierarchical, {"something": data}):
    idata_h = pm.sample(
        target_accept=0.95,
    )

image
image798Ă—394 25.5 KB

After sampling finishes it comes up alright:

image
image1556Ă—396 41.2 KB

2

@fonnesbeck

3

Was working with this yesterday, and it works fine for me. Progress bar looks like this both during and after sampling.

image
image2230Ă—902 115 KB

4

Hmm, any idea how to debug? I started a new notebook - no dice, the progress bar comes up only after sampling is finished. Also if i interrupt it, it briefly comes up and then disappears. marimo==0.23.6

5

Can you try some variants? cores=1 (so no multiprocessing) and nuts_sampler=“pymc” vs “nutpie”?

6

pymc sampler works both single and multithreaded, nutpie does not work both single and multithreaded.

7

What are your environment details?

8 
{
  "marimo": "0.23.6",
  "editable": false,
  "location": "<...>/.venv/lib/python3.12/site-packages/marimo",
  "OS": "Darwin",
  "OS Version": "24.6.0",
  "Processor": "arm",
  "Python Version": "3.12.11",
  "Locale": "C/en_US",
  "Binaries": {
    "Browser": "147.0.7727.138",
    "Node": "v24.3.0",
    "uv": "0.7.11 (Homebrew 2025-06-04)"
  },
  "Dependencies": {
    "click": "8.3.3",
    "docutils": "0.22.4",
    "itsdangerous": "2.2.0",
    "jedi": "0.19.2",
    "markdown": "3.10.2",
    "narwhals": "2.20.0",
    "packaging": "26.2",
    "psutil": "7.2.2",
    "pygments": "2.20.0",
    "pymdown-extensions": "10.21.2",
    "pyyaml": "6.0.3",
    "starlette": "1.0.0",
    "tomlkit": "0.14.0",
    "typing-extensions": "4.15.0",
    "uvicorn": "0.46.0",
    "websockets": "16.0"
  },
  "Optional Dependencies": {
    "loro": "1.10.3",
    "pandas": "2.3.3",
    "pyarrow": "24.0.0",
    "pytest": "9.0.2",
    "ruff": "0.15.12"
  },
  "Experimental Flags": {}
}
9

Can you share your pymc and nutpie versions as well?

10 
❯ uv pip show pymc nutpie
Using Python 3.12.11 environment at: .venv
Name: nutpie
Version: 0.16.10
Location: .venv/lib/python3.12/site-packages
Requires: arro3-core, arviz, obstore, pandas, platformdirs, pyarrow, xarray, zarr
Required-by:
---
Name: pymc
Version: 6.0.0
Location: .venv/lib/python3.12/site-packages
Requires: arviz, cachetools, cloudpickle, numpy, pandas, pytensor, rich, scipy, threadpoolctl, typing-extensions
Required-by: pymc-extras
11

will try to run on marimo tomorrow to see if I can reproduce. What OS are you in?

1 Like
12

MacOS 15.7.5 (24G624)

13

I can reproduce marimo bars don’t progress with marimo, just none → all. There’s some custom code and I have to be honest I didn’t test with marimo ahead of time.

Also noticed marimo keeps updating speed for finished bars in PyMC… Will try to fix. Thanks a lot for reporting

14

Should be fixed by Fix marimo progress bar issues by ricardoV94 · Pull Request #8298 · pymc-devs/pymc · GitHub

15

should be fixed in 6.0.1