Remove thread-unsafe multiprocessing code from `pathfinder.py`

[jessegrabowski]

The Pathfinder code has some multiprocessing options that are not correctly handled. This was causing the CI to hang indefinitely, which isn't good. Pathfinder tests were disabled in #597, pending removal of this feature.

@aseyboldt should be a good resource for how to handle multiprocessing correctly with compiled pytensor functions.

[jessegrabowski]

cc: @aphc14 @fonnesbeck

[fonnesbeck]

Is this a start method issue (i.e. "spawn" vs "fork")?

On Tue, Oct 28, 2025 at 8:22 PM Jesse Grabowski @.***> wrote:

jessegrabowski left a comment (pymc-devs/pymc-extras#603) https://github.com/pymc-devs/pymc-extras/issues/603#issuecomment-3459262544

cc: @aphc14 https://github.com/aphc14 @fonnesbeck https://github.com/fonnesbeck

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