Hi all,
I have been having a consistent issue trying to use pymc on Windows for several weeks. I had similar issues as in this thread, though I have been through multiple installations in the interim. Trying to run any NUTS sampling on even a simple model is impossible. If I don’t use
pytensor.config.cxx = ''"
Then the models will not sample and I will get an
"ERROR (pytensor.graph.rewriting.basic): Rewrite failure due to: constant_folding"
and the model won’t sample. If I do include this line, but try to sample from more than 1 core (for example, a simple logistic regression model from bambi like:
first_model = bmb.Model(
"made ~ attempt_yards",
pd_data,
family='bernoulli'
)
first_model_idata = first_model.fit(
draws=1000,
random_seed = 0,
chains = 4
)
ParallelSamplingError: Chain 0 failed with: The model could not be unpickled. This is required for sampling with more than one core and multiprocessing context spawn or forkserver.
[ ]:
If I instead specify to use a single core, the first chain estimates 3 hours of sampling time. I have listed my pymc_env packages below. I am really at my wits end and don’t know what to do.
# Name Version Build Channel
_openmp_mutex 4.5 2_gnu conda-forge
_python_abi3_support 1.0 hd8ed1ab_2 conda-forge
anyio 4.9.0 pyh29332c3_0 conda-forge
argon2-cffi 23.1.0 pyhd8ed1ab_1 conda-forge
argon2-cffi-bindings 21.2.0 py313ha7868ed_5 conda-forge
arrow 1.3.0 pyhd8ed1ab_1 conda-forge
arviz 0.21.0 pyhd8ed1ab_0 conda-forge
asttokens 3.0.0 pyhd8ed1ab_1 conda-forge
async-lru 2.0.5 pyh29332c3_0 conda-forge
attrs 25.3.0 pyh71513ae_0 conda-forge
babel 2.17.0 pyhd8ed1ab_0 conda-forge
bambi 0.13.0 pypi_0 pypi
beautifulsoup4 4.13.4 pyha770c72_0 conda-forge
binutils_impl_win-64 2.43 h095e170_4 conda-forge
binutils_win-64 2.43 hd1c8def_4 conda-forge
blas 2.131 mkl conda-forge
blas-devel 3.9.0 31_hfb1a452_mkl conda-forge
bleach 6.2.0 pyh29332c3_4 conda-forge
bleach-with-css 6.2.0 h82add2a_4 conda-forge
brotli 1.1.0 h2466b09_2 conda-forge
brotli-bin 1.1.0 h2466b09_2 conda-forge
brotli-python 1.1.0 py313h5813708_2 conda-forge
bzip2 1.0.8 h2466b09_7 conda-forge
ca-certificates 2025.4.26 h4c7d964_0 conda-forge
cached-property 1.5.2 hd8ed1ab_1 conda-forge
cached_property 1.5.2 pyha770c72_1 conda-forge
cachetools 5.5.2 pyhd8ed1ab_0 conda-forge
cairo 1.18.4 h5782bbf_0 conda-forge
certifi 2025.4.26 pyhd8ed1ab_0 conda-forge
cffi 1.17.1 py313ha7868ed_0 conda-forge
charset-normalizer 3.4.2 pyhd8ed1ab_0 conda-forge
cloudpickle 3.1.1 pyhd8ed1ab_0 conda-forge
colorama 0.4.6 pyhd8ed1ab_1 conda-forge
comm 0.2.2 pyhd8ed1ab_1 conda-forge
cons 0.4.6 pyhd8ed1ab_1 conda-forge
contourpy 1.3.2 py313h1ec8472_0 conda-forge
cpython 3.13.3 py313hd8ed1ab_101 conda-forge
cryptography 44.0.3 pypi_0 pypi
cycler 0.12.1 pyhd8ed1ab_1 conda-forge
debugpy 1.8.14 py313h5813708_0 conda-forge
decorator 5.2.1 pyhd8ed1ab_0 conda-forge
defusedxml 0.7.1 pyhd8ed1ab_0 conda-forge
deprecated 1.2.18 pypi_0 pypi
etuples 0.3.9 pyhd8ed1ab_1 conda-forge
exceptiongroup 1.2.2 pyhd8ed1ab_1 conda-forge
executing 2.2.0 pyhd8ed1ab_0 conda-forge
filelock 3.18.0 pyhd8ed1ab_0 conda-forge
font-ttf-dejavu-sans-mono 2.37 hab24e00_0 conda-forge
font-ttf-inconsolata 3.000 h77eed37_0 conda-forge
font-ttf-source-code-pro 2.038 h77eed37_0 conda-forge
font-ttf-ubuntu 0.83 h77eed37_3 conda-forge
fontconfig 2.15.0 h765892d_1 conda-forge
fonts-conda-ecosystem 1 0 conda-forge
fonts-conda-forge 1 0 conda-forge
fonttools 4.57.0 py313hb4c8b1a_0 conda-forge
formulae 0.5.4 pypi_0 pypi
fqdn 1.5.1 pyhd8ed1ab_1 conda-forge
freetype 2.13.3 h57928b3_1 conda-forge
fribidi 1.0.10 h8d14728_0 conda-forge
gcc 13.3.0 hf9c6911_2 conda-forge
gcc_impl_win-64 13.3.0 h14668b0_2 conda-forge
gcc_win-64 13.3.0 h3842d22_10 conda-forge
gendef v12.0.0.r1.ggdc42231f0 he1bec0e_1 conda-forge
getopt-win32 0.1 hcfcfb64_1 conda-forge
graphite2 1.3.13 h63175ca_1003 conda-forge
graphviz 12.2.1 hf40819d_1 conda-forge
gts 0.7.6 h6b5321d_4 conda-forge
gxx 13.3.0 hf9c6911_2 conda-forge
gxx_impl_win-64 13.3.0 h317ec3d_2 conda-forge
gxx_win-64 13.3.0 h3842d22_10 conda-forge
h11 0.16.0 pyhd8ed1ab_0 conda-forge
h2 4.2.0 pyhd8ed1ab_0 conda-forge
h5netcdf 1.6.1 pyhd8ed1ab_0 conda-forge
h5py 3.13.0 nompi_py313h74a315e_101 conda-forge
harfbuzz 11.1.0 h8796e6f_0 conda-forge
hdf5 1.14.6 nompi_hd5d9e70_101 conda-forge
hpack 4.1.0 pyhd8ed1ab_0 conda-forge
httpcore 1.0.9 pyh29332c3_0 conda-forge
httpx 0.28.1 pyhd8ed1ab_0 conda-forge
hyperframe 6.1.0 pyhd8ed1ab_0 conda-forge
icu 75.1 he0c23c2_0 conda-forge
idna 3.10 pyhd8ed1ab_1 conda-forge
importlib-metadata 8.6.1 pyha770c72_0 conda-forge
importlib_resources 6.5.2 pyhd8ed1ab_0 conda-forge
intel-openmp 2024.2.1 h57928b3_1083 conda-forge
ipykernel 6.29.5 pyh4bbf305_0 conda-forge
ipython 9.2.0 pyhca29cf9_0 conda-forge
ipython_pygments_lexers 1.1.1 pyhd8ed1ab_0 conda-forge
ipywidgets 8.1.7 pyhd8ed1ab_0 conda-forge
isoduration 20.11.0 pyhd8ed1ab_1 conda-forge
jax 0.6.0 pypi_0 pypi
jaxlib 0.6.0 pypi_0 pypi
jedi 0.19.2 pyhd8ed1ab_1 conda-forge
jinja2 3.1.6 pyhd8ed1ab_0 conda-forge
json5 0.12.0 pyhd8ed1ab_0 conda-forge
jsonpointer 3.0.0 py313hfa70ccb_1 conda-forge
jsonschema 4.23.0 pyhd8ed1ab_1 conda-forge
jsonschema-specifications 2025.4.1 pyh29332c3_0 conda-forge
jsonschema-with-format-nongpl 4.23.0 hd8ed1ab_1 conda-forge
jupyter 1.1.1 pyhd8ed1ab_1 conda-forge
jupyter-lsp 2.2.5 pyhd8ed1ab_1 conda-forge
jupyter_client 8.6.3 pyhd8ed1ab_1 conda-forge
jupyter_console 6.6.3 pyhd8ed1ab_1 conda-forge
jupyter_core 5.7.2 pyh5737063_1 conda-forge
jupyter_events 0.12.0 pyh29332c3_0 conda-forge
jupyter_server 2.15.0 pyhd8ed1ab_0 conda-forge
jupyter_server_terminals 0.5.3 pyhd8ed1ab_1 conda-forge
jupyterlab 4.4.2 pyhd8ed1ab_0 conda-forge
jupyterlab_pygments 0.3.0 pyhd8ed1ab_2 conda-forge
jupyterlab_server 2.27.3 pyhd8ed1ab_1 conda-forge
jupyterlab_widgets 3.0.15 pyhd8ed1ab_0 conda-forge
kiwisolver 1.4.7 py313h1ec8472_0 conda-forge
krb5 1.21.3 hdf4eb48_0 conda-forge
lcms2 2.17 hbcf6048_0 conda-forge
ld_impl_win-64 2.43 hae1bf67_4 conda-forge
lerc 4.0.0 h6470a55_1 conda-forge
libaec 1.1.3 h63175ca_0 conda-forge
libblas 3.9.0 31_h641d27c_mkl conda-forge
libbrotlicommon 1.1.0 h2466b09_2 conda-forge
libbrotlidec 1.1.0 h2466b09_2 conda-forge
libbrotlienc 1.1.0 h2466b09_2 conda-forge
libcblas 3.9.0 31_h5e41251_mkl conda-forge
libcurl 8.13.0 h88aaa65_0 conda-forge
libdeflate 1.23 h76ddb4d_0 conda-forge
libexpat 2.7.0 he0c23c2_0 conda-forge
libffi 3.4.6 h537db12_1 conda-forge
libfreetype 2.13.3 h57928b3_1 conda-forge
libfreetype6 2.13.3 h0b5ce68_1 conda-forge
libgcc 15.1.0 h1383e82_2 conda-forge
libgcc-devel_win-64 13.3.0 h5200ebd_102 conda-forge
libgd 2.3.3 h7208af6_11 conda-forge
libglib 2.84.1 hbc94333_1 conda-forge
libgomp 15.1.0 h1383e82_2 conda-forge
libhwloc 2.11.2 default_ha69328c_1001 conda-forge
libiconv 1.18 h135ad9c_1 conda-forge
libintl 0.22.5 h5728263_3 conda-forge
libjpeg-turbo 3.1.0 h2466b09_0 conda-forge
liblapack 3.9.0 31_h1aa476e_mkl conda-forge
liblapacke 3.9.0 31_h845c4fa_mkl conda-forge
liblzma 5.8.1 h2466b09_1 conda-forge
libmpdec 4.0.0 h2466b09_0 conda-forge
libpng 1.6.47 h7a4582a_0 conda-forge
libsodium 1.0.20 hc70643c_0 conda-forge
libsqlite 3.49.2 h67fdade_0 conda-forge
libssh2 1.11.1 h9aa295b_0 conda-forge
libstdcxx 15.1.0 h904f734_2 conda-forge
libstdcxx-devel_win-64 13.3.0 h5200ebd_102 conda-forge
libtiff 4.7.0 h797046b_4 conda-forge
libwebp-base 1.5.0 h3b0e114_0 conda-forge
libwinpthread 12.0.0.r4.gg4f2fc60ca h57928b3_9 conda-forge
libxcb 1.17.0 h0e4246c_0 conda-forge
libxml2 2.13.8 h442d1da_0 conda-forge
libzlib 1.3.1 h2466b09_2 conda-forge
lightgbm 4.6.0 pypi_0 pypi
llvmlite 0.44.0 py313hb80970b_1 conda-forge
logical-unification 0.4.6 pyhd8ed1ab_0 conda-forge
lxml 5.4.0 pypi_0 pypi
m2w64-sysroot_win-64 12.0.0.r4.gg4f2fc60ca h7428d3b_9 conda-forge
markdown-it-py 3.0.0 pyhd8ed1ab_1 conda-forge
markupsafe 3.0.2 py313hb4c8b1a_1 conda-forge
matplotlib-base 3.10.3 py313h81b4f16_0 conda-forge
matplotlib-inline 0.1.7 pyhd8ed1ab_1 conda-forge
mdurl 0.1.2 pyhd8ed1ab_1 conda-forge
miceforest 6.0.3 pypi_0 pypi
mingw-w64-ucrt-x86_64-crt-git 12.0.0.r4.gg4f2fc60ca h7428d3b_9 conda-forge
mingw-w64-ucrt-x86_64-headers-git 12.0.0.r4.gg4f2fc60ca h7428d3b_9 conda-forge
mingw-w64-ucrt-x86_64-windows-default-manifest 6.4 he206cdd_7 conda-forge
mingw-w64-ucrt-x86_64-winpthreads-git 12.0.0.r4.gg4f2fc60ca h7428d3b_9 conda-forge
minikanren 1.0.3 pyhd8ed1ab_1 conda-forge
mistune 3.1.3 pyh29332c3_0 conda-forge
mkl 2024.2.2 h66d3029_15 conda-forge
mkl-devel 2024.2.2 h57928b3_15 conda-forge
mkl-include 2024.2.2 h66d3029_15 conda-forge
mkl-service 2.4.2 py313hb149f7d_1 conda-forge
ml-dtypes 0.5.1 pypi_0 pypi
multipledispatch 0.6.0 pyhd8ed1ab_1 conda-forge
munkres 1.1.4 pyh9f0ad1d_0 conda-forge
nbclient 0.10.2 pyhd8ed1ab_0 conda-forge
nbconvert-core 7.16.6 pyh29332c3_0 conda-forge
nbformat 5.10.4 pyhd8ed1ab_1 conda-forge
nest-asyncio 1.6.0 pyhd8ed1ab_1 conda-forge
notebook 7.4.2 pyhd8ed1ab_0 conda-forge
notebook-shim 0.2.4 pyhd8ed1ab_1 conda-forge
numba 0.61.2 py313h4ca4f0f_0 conda-forge
numpy 2.2.5 py313hefb8edb_0 conda-forge
numpyro 0.18.0 pypi_0 pypi
nutpie 0.14.3 pypi_0 pypi
openjpeg 2.5.3 h4d64b90_0 conda-forge
openssl 3.5.0 ha4e3fda_1 conda-forge
opt-einsum 3.4.0 pypi_0 pypi
overrides 7.7.0 pyhd8ed1ab_1 conda-forge
packaging 25.0 pyh29332c3_1 conda-forge
pandas 2.2.3 py313hf91d08e_3 conda-forge
pandocfilters 1.5.0 pyhd8ed1ab_0 conda-forge
pango 1.56.3 h0c53d3b_1 conda-forge
parso 0.8.4 pyhd8ed1ab_1 conda-forge
patsy 1.0.1 pypi_0 pypi
pcre2 10.45 h99c9b8b_0 conda-forge
pickleshare 0.7.5 pyhd8ed1ab_1004 conda-forge
pillow 11.2.1 py313hda88b71_0 conda-forge
pip 25.1.1 pyh145f28c_0 conda-forge
pixman 0.46.0 had0cd8c_0 conda-forge
pkgutil-resolve-name 1.3.10 pyhd8ed1ab_2 conda-forge
platformdirs 4.3.8 pyhe01879c_0 conda-forge
polars 1.29.0 py39haf3f19b_0 conda-forge
prometheus_client 0.21.1 pyhd8ed1ab_0 conda-forge
prompt-toolkit 3.0.51 pyha770c72_0 conda-forge
prompt_toolkit 3.0.51 hd8ed1ab_0 conda-forge
psutil 7.0.0 py313ha7868ed_0 conda-forge
pthread-stubs 0.4 h0e40799_1002 conda-forge
pure_eval 0.2.3 pyhd8ed1ab_1 conda-forge
pyarrow 20.0.0 pypi_0 pypi
pybaseball 2.2.7 pypi_0 pypi
pycparser 2.22 pyh29332c3_1 conda-forge
pygithub 2.6.1 pypi_0 pypi
pygments 2.19.1 pyhd8ed1ab_0 conda-forge
pyjwt 2.10.1 pypi_0 pypi
pymc 5.22.0 hd8ed1ab_0 conda-forge
pymc-base 5.22.0 pyhd8ed1ab_0 conda-forge
pynacl 1.5.0 pypi_0 pypi
pyparsing 3.2.3 pyhd8ed1ab_1 conda-forge
pysocks 1.7.1 pyh09c184e_7 conda-forge
pytensor 2.30.3 py313h62d098f_0 conda-forge
pytensor-base 2.30.3 np2py313h3710a23_0 conda-forge
python 3.13.3 h261c0b1_101_cp313 conda-forge
python-dateutil 2.9.0.post0 pyhff2d567_1 conda-forge
python-fastjsonschema 2.21.1 pyhd8ed1ab_0 conda-forge
python-gil 3.13.3 h4df99d1_101 conda-forge
python-graphviz 0.20.3 pyh91182bf_2 conda-forge
python-json-logger 2.0.7 pyhd8ed1ab_0 conda-forge
python-tzdata 2025.2 pyhd8ed1ab_0 conda-forge
python_abi 3.13 7_cp313 conda-forge
pytz 2025.2 pyhd8ed1ab_0 conda-forge
pywin32 307 py313h5813708_3 conda-forge
pywinpty 2.0.15 py313h5813708_0 conda-forge
pyyaml 6.0.2 py313hb4c8b1a_2 conda-forge
pyzmq 26.4.0 py313h2100fd5_0 conda-forge
qhull 2020.2 hc790b64_5 conda-forge
referencing 0.36.2 pyh29332c3_0 conda-forge
requests 2.32.3 pyhd8ed1ab_1 conda-forge
rfc3339-validator 0.1.4 pyhd8ed1ab_1 conda-forge
rfc3986-validator 0.1.1 pyh9f0ad1d_0 conda-forge
rich 14.0.0 pyh29332c3_0 conda-forge
rpds-py 0.24.0 py313h54fc02f_0 conda-forge
scipy 1.15.2 py313h2eca4b9_0 conda-forge
seaborn 0.13.2 pypi_0 pypi
send2trash 1.8.3 pyh5737063_1 conda-forge
setuptools 80.1.0 pyhff2d567_0 conda-forge
six 1.17.0 pyhd8ed1ab_0 conda-forge
sniffio 1.3.1 pyhd8ed1ab_1 conda-forge
soupsieve 2.7 pyhd8ed1ab_0 conda-forge
stack_data 0.6.3 pyhd8ed1ab_1 conda-forge
statsmodels 0.14.4 pypi_0 pypi
tbb 2021.13.0 h62715c5_1 conda-forge
terminado 0.18.1 pyh5737063_0 conda-forge
threadpoolctl 3.6.0 pyhecae5ae_0 conda-forge
tinycss2 1.4.0 pyhd8ed1ab_0 conda-forge
tk 8.6.13 h5226925_1 conda-forge
tomli 2.2.1 pyhd8ed1ab_1 conda-forge
toolz 1.0.0 pyhd8ed1ab_1 conda-forge
tornado 6.4.2 py313ha7868ed_0 conda-forge
tqdm 4.67.1 pypi_0 pypi
traitlets 5.14.3 pyhd8ed1ab_1 conda-forge
types-python-dateutil 2.9.0.20241206 pyhd8ed1ab_0 conda-forge
typing-extensions 4.13.2 h0e9735f_0 conda-forge
typing_extensions 4.13.2 pyh29332c3_0 conda-forge
typing_utils 0.1.0 pyhd8ed1ab_1 conda-forge
tzdata 2025b h78e105d_0 conda-forge
ucrt 10.0.22621.0 h57928b3_1 conda-forge
uri-template 1.3.0 pyhd8ed1ab_1 conda-forge
urllib3 2.4.0 pyhd8ed1ab_0 conda-forge
vc 14.3 h2b53caa_26 conda-forge
vc14_runtime 14.42.34438 hfd919c2_26 conda-forge
vs2015_runtime 14.42.34438 h7142326_26 conda-forge
wcwidth 0.2.13 pyhd8ed1ab_1 conda-forge
webcolors 24.11.1 pyhd8ed1ab_0 conda-forge
webencodings 0.5.1 pyhd8ed1ab_3 conda-forge
websocket-client 1.8.0 pyhd8ed1ab_1 conda-forge
widgetsnbextension 4.0.14 pyhd8ed1ab_0 conda-forge
win_inet_pton 1.1.0 pyh7428d3b_8 conda-forge
winpty 0.4.3 4 conda-forge
wrapt 1.17.2 pypi_0 pypi
xarray 2025.4.0 pyhd8ed1ab_0 conda-forge
xarray-einstats 0.8.0 pyhd8ed1ab_1 conda-forge
xorg-libice 1.1.2 h0e40799_0 conda-forge
xorg-libsm 1.2.6 h0e40799_0 conda-forge
xorg-libx11 1.8.12 hf48077a_0 conda-forge
xorg-libxau 1.0.12 h0e40799_0 conda-forge
xorg-libxdmcp 1.1.5 h0e40799_0 conda-forge
xorg-libxext 1.3.6 h0e40799_0 conda-forge
xorg-libxpm 3.5.17 h0e40799_1 conda-forge
xorg-libxt 1.3.1 h0e40799_0 conda-forge
yaml 0.2.5 h8ffe710_2 conda-forge
zeromq 4.3.5 ha9f60a1_7 conda-forge
zipp 3.21.0 pyhd8ed1ab_1 conda-forge
zstandard 0.23.0 py313ha7868ed_2 conda-forge
zstd 1.5.7 hbeecb71_2 conda-forge