PyMC3/Theano conflict

[benston3]

Look like there is a problem that needs to be sorted out by PyMC3. When building Docker Cluster with latest version of Ubuntu/Theano/PyMC3 we get the following error:

private_server | Traceback (most recent call last):
private_server |   File "grpc/server.py", line 2, in <module>
private_server |     from Private.semantics import private_semantic_analyser
private_server |   File "/opt/venv/lib/python3.8/site-packages/Private/semantics.py", line 3, in <module>
private_server |     from Private.builtins import show_builtins, show_prob_builtins, commands, plot_builtins
private_server |   File "/opt/venv/lib/python3.8/site-packages/Private/builtins.py", line 11, in <module>
private_server |     import pymc3 as pm
private_server |   File "/opt/venv/lib/python3.8/site-packages/pymc3/__init__.py", line 39, in <module>
private_server |     __set_compiler_flags()
private_server |   File "/opt/venv/lib/python3.8/site-packages/pymc3/__init__.py", line 33, in __set_compiler_flags
private_server |     import theano
private_server |   File "/opt/venv/lib/python3.8/site-packages/theano/__init__.py", line 110, in <module>
private_server |     from theano.compile import (
private_server |   File "/opt/venv/lib/python3.8/site-packages/theano/compile/__init__.py", line 28, in <module>
private_server |     from theano.compile.function import function, function_dump
private_server |   File "/opt/venv/lib/python3.8/site-packages/theano/compile/function/__init__.py", line 7, in <module>
private_server |     from theano.compile.function.pfunc import pfunc
private_server |   File "/opt/venv/lib/python3.8/site-packages/theano/compile/function/pfunc.py", line 10, in <module>
private_server |     from theano.compile.function.types import UnusedInputError, orig_function
private_server |   File "/opt/venv/lib/python3.8/site-packages/theano/compile/function/types.py", line 23, in <module>
private_server |     from theano.gof.toolbox import is_same_graph
private_server | ImportError: cannot import name 'is_same_graph' from 'theano.gof.toolbox' (/opt/venv/lib/python3.8/site-packages/theano/gof/toolbox.py)

In the short term, freezing Theano and PyMC3 at the following versions until the problem is sorted out.

pymc3==3.8
Theano==1.0.4

We need to investigate further and if need be inform PyMC3 of the problem.