TypeError: 'numpy.int64' object is not iterable

[HongyuHe]

Greetings!

I'm encountering the following error:

• python: 3.10.8
• OS: macos 15.0.1 (24A348)
• cmd: python cp2022_experiments.py -exp graph
• Error trace:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/multiprocessing/pool.py", line 125, in worker
    result = (True, func(*args, **kwds))
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/multiprocessing/pool.py", line 51, in starmapstar
    return list(itertools.starmap(args[0], args[1]))
  File "/Users/user/COUNT-CP/cp2022_experiments.py", line 36, in experiment_time_taken
    bounding_expressions = learn(instances[:1], training_size, symbolic)
  File "/Users/user/COUNT-CP/learn.py", line 458, in learn
    for key, val in learn_for_expression(instances, exp, symbolic, training_size).items():
  File "/Users/user/COUNT-CP/learn.py", line 387, in learn_for_expression
    local_bounds = learn_local_bounds(instance, expression, training_size)
  File "/Users/user/COUNT-CP/learn.py", line 357, in learn_local_bounds
    compute_bounds(indices)
  File "/Users/user/COUNT-CP/learn.py", line 347, in compute_bounds
    lb, ub = expression.bounds(*args)
  File "/Users/user/COUNT-CP/learn.py", line 51, in bounds
    return min(vals), max(vals)
  File "/Users/user/COUNT-CP/venv/lib/python3.10/site-packages/cpmpy/expressions/python_builtins.py", line 110, in min
    return builtins.min(*iterable, **kwargs)
TypeError: 'numpy.int64' object is not iterable

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/user/COUNT-CP/cp2022_experiments.py", line 174, in <module>
    pool.starmap(experiment_time_taken, iterations)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/multiprocessing/pool.py", line 375, in starmap
    return self._map_async(func, iterable, starmapstar, chunksize).get()
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/multiprocessing/pool.py", line 774, in get
    raise self._value
TypeError: 'numpy.int64' object is not iterable

[HongyuHe]

Also, the statistic() function in cp2022_experiments.py is also missing. Would appreciate any help!

@tias @probberechts