I cannot import pymc3

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I cannot import pymc3, after installation I get the error message below. Based on issues others noted I installed !pip install pymc3, conda install m2w64-toolchain, conda install theano

I get the same error message when attempting to import theano as well. "ImportError: cannot import name 'is_same_graph' from 'theano.gof.toolbox"

import pymc3 as pm
Traceback (most recent call last):

  File "<ipython-input-2-2e5c536b7c65>", line 1, in <module>
    import pymc3 as pm

  File "C:\Users\xxx\Anaconda3\lib\site-packages\pymc3\__init__.py", line 39, in <module>
    __set_compiler_flags()

  File "C:\Users\xxx\Anaconda3\lib\site-packages\pymc3\__init__.py", line 33, in __set_compiler_flags
    import theano

  File "C:\Users\xxx\Anaconda3\lib\site-packages\theano\__init__.py", line 110, in <module>
    from theano.compile import (

  File "C:\Users\xxx\Anaconda3\lib\site-packages\theano\compile\__init__.py", line 28, in <module>
    from theano.compile.function import function, function_dump

  File "C:\Users\xxx\Anaconda3\lib\site-packages\theano\compile\function\__init__.py", line 7, in <module>
    from theano.compile.function.pfunc import pfunc

  File "C:\Users\xxx\Anaconda3\lib\site-packages\theano\compile\function\pfunc.py", line 10, in <module>
    from theano.compile.function.types import UnusedInputError, orig_function

  File "C:\Users\xxx\Anaconda3\lib\site-packages\theano\compile\function\types.py", line 23, in <module>
    from theano.gof.toolbox import is_same_graph

ImportError: cannot import name 'is_same_graph' from 'theano.gof.toolbox' (C:\Users\xxx\Anaconda3\lib\site-packages\theano\gof\toolbox.py)
pymc3 python
1 Answers

You likely need to ensure you have the correct version of the Theano-PyMC fork of Theano installed. You may also need to remove an overlapping installation of the original Theano. At this time it looks like PyMC3 3.10.0 is constrained to install with Theano-PyMC 1.0.11. You may find that

conda remove theano
pip uninstall Theano Theano-PyMC PyMC3
pip install PyMC3

would fix your issue. If not, you may need to remove the theano directory. On a *nix system, depending on your configuration, this could be in /usr/lib so you might need to run an analog of

sudo rm -fr /usr/lib/python3.9/site-packages/theano/

relevant to your Windows system in between the uninstall and reinstall. There may be other issues that arise because of the interaction between anaconda and pip.

user_4469070
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