logging levels not set comprehensively (still get INFO messages with WARNING set)

Summary:

I set the logger level to WARNING before compiling and running a model, but I still see INFO level warning messages.

Description:

Here's a simple reproducible example consisting of a Stan program and a Python script that can go in the same directory and run as shown below.

binomial-rng.stan:

data {
  int<lower=0> N;
  real<lower=0, upper=1> theta;
}
generated quantities {
  int<lower=0, upper=N> y = binomial_rng(N, theta);
}

bug.py

import cmdstanpy
import logging

logging.getLogger('cmdstanpy').setLevel(logging.WARNING)

N = 100
theta = 0.3
data = {'N': N, 'theta': theta}
model = cmdstanpy.CmdStanModel(stan_file = 'binomial-rng.stan')
sample = model.sample(data = data, seed=123,
                      iter_sampling = 10, iter_warmup = 0, chains = 1,
                      show_progress = False, show_console = False)

~/temp2$ python3 bug.py 
14:43:39 - cmdstanpy - INFO - CmdStan start processing
14:43:39 - cmdstanpy - INFO - Chain [1] start processing
14:43:39 - cmdstanpy - INFO - Chain [1] done processing
14:43:39 - cmdstanpy - INFO - deleting tmpfiles dir: /var/folders/b3/6h4t41094vz281j7nn48ws900001jv/T/tmpojw6vov9
14:43:39 - cmdstanpy - INFO - done

The same error arises if you set logging.ERROR instead of logging.WARNING.

@WardBrian suggested the problem might be that there are several loggers being used by CmdStanPy, but only some of them are getting their level set.

Context

I would like to silence all the DEBUG and INFO level messages in the context of constructing a quarto tutorial.

Current Version:

>>> import cmdstanpy
>>> cmdstanpy.show_versions()
INSTALLED VERSIONS
---------------------
python: 3.9.4 (default, Apr  5 2021, 01:47:16) 
[Clang 11.0.0 (clang-1100.0.33.17)]
python-bits: 64
OS: Darwin
OS-release: 22.3.0
machine: x86_64
processor: i386
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: ('en_US', 'UTF-8')
cmdstan_folder: /Users/bcarpenter/.cmdstan/cmdstan-2.31.0
cmdstan: (2, 31)
cmdstanpy: 1.0.4
pandas: 1.4.3
xarray: 2023.1.0
tdqm: None
numpy: 1.24.1
ujson: 5.4.0

' '

Reproduce the report with binomial-rng.stan and bug.py, starting at the logging.getLogger('cmdstanpy') configuration and the CmdStanModel.sample call. Trace the logger names used for the reported messages and verify that setting WARNING suppresses INFO output without affecting model execution.