Describe the issue:

When calling pyMC SMC sampling from RStudio with multiple chains, the new Rich progress bars fill the Console and the Rmarkdown output with chains lines every 0.1 seconds, eventually flooding the console and slowing down RStudio to a crawl.

This is because RStudio console output does not implement cursor movement ANSI control sequences used by Rich multi-progress bars.

See rstudio/reticulate#1632 and rstudio/rstudio#14942

Reproduceable code example:

import pymc as pm

# Run this via a Python chunk in Rstudio with reticulate

def main():

    with pm.Model() as model:
        x = pm.Normal("x", mu=0, sigma=1)
        y = pm.Normal("y", mu=x, sigma=0.001, observed=2)

    with model:
        trace = pm.sample_smc(draws=1000, chains=12, cores=1, progressbar=False)


if __name__ == "__main__":
    main()

Error message:

No error message. See the screenshot.

PyMC version information: