ValueError: not enough values to unpack reported when running MNIST example

[zl-xiang]

Describe the bug

Hi,

I encountered a ValueError: not enough values to unpack when running the provided examples as instruction told, error details shown as following:

stack trace:

Traceback (most recent call last):
  File "Add/add.py", line 4, in <module>
    from deepproblog.engines import ExactEngine
  File "/Users/mac/Documents/Academic/projects/dissertation/deepproblog/src/deepproblog/engines/__init__.py", line 1, in <module>
    from deepproblog.engines.approximate_engine import ApproximateEngine
  File "/Users/mac/Documents/Academic/projects/dissertation/deepproblog/src/deepproblog/engines/approximate_engine.py", line 2, in <module>
    from deepproblog.engines.prolog_engine import (
  File "/Users/mac/Documents/Academic/projects/dissertation/deepproblog/src/deepproblog/engines/prolog_engine/__init__.py", line 1, in <module>
    from .engine import PrologEngine
  File "/Users/mac/Documents/Academic/projects/dissertation/deepproblog/src/deepproblog/engines/prolog_engine/engine.py", line 4, in <module>
    from pyswip import Prolog
  File "/usr/local/anaconda3/lib/python3.8/site-packages/pyswip/__init__.py", line 29, in <module>
    from pyswip.prolog import Prolog
  File "/usr/local/anaconda3/lib/python3.8/site-packages/pyswip/prolog.py", line 28, in <module>
    from pyswip.core import *
  File "/usr/local/anaconda3/lib/python3.8/site-packages/pyswip/core.py", line 567, in <module>
    (_path, SWI_HOME_DIR) = _findSwipl()
  File "/usr/local/anaconda3/lib/python3.8/site-packages/pyswip/core.py", line 416, in _findSwipl
    (path, swiHome) = _findSwiplDar()
  File "/usr/local/anaconda3/lib/python3.8/site-packages/pyswip/core.py", line 370, in _findSwiplDar
    (path, swiHome) = _findSwiplFromExec()
  File "/usr/local/anaconda3/lib/python3.8/site-packages/pyswip/core.py", line 93, in _findSwiplFromExec
    rtvars = dict((name, value[1:-1]) for name, value in ret) # [1:-1] gets
  File "/usr/local/anaconda3/lib/python3.8/site-packages/pyswip/core.py", line 93, in <genexpr>
    rtvars = dict((name, value[1:-1]) for name, value in ret) # [1:-1] gets
ValueError: not enough values to unpack (expected 2, got 1)

To Reproduce
Steps to reproduce the behavior:

1. cd ~/deepproblog/src/
2. export PYTHONPATH=`pwd`
3. python3 deepproblog/examples/MNIST/addition.py

Desktop (please complete the following information):

• OS: macOS 11.4
• Python Version: 3.8
• problog 2.1.0.42
• PySDD 0.2.10
• pyswip 0.2.10
• torch 1.8.0
• torchvision 0.9.0

Please help, thank you !

[rmanhaeve]

Hi mexicer. From your stack trace, this seems like a bug in pyswip instead. It seems to me like the same issue as this one: yuce/pyswip#76

Good luck.

[zl-xiang]

Hi mexicer. From your stack trace, this seems like a bug in pyswip instead. It seems to me like the same issue as this one: yuce/pyswip#76

Good luck.

I guess this could be a problem of OS, I'll try to run it on Linux, thanks !