Unable to import open3d on python 3.8 in Pycharm

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IMPORTANT: Please use the following template to report the bug.

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Describe the bug import open3d doesn't work

To Reproduce Steps to reproduce the behavior:

1. import open3d
2. run
3. See error

   /home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/externals/joblib/externals/cloudpickle/cloudpickle.py:47: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
   import imp
   Traceback (most recent call last):
   File "/home/muhammadmehdi/PycharmProjects/memex/create_ptcloud_plot.py", line 1, in <module>
   import open3d
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/open3d/__init__.py", line 103, in <module>
   import open3d.ml
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/open3d/ml/__init__.py", line 35, in <module>
   from . import datasets
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/open3d/ml/datasets.py", line 34, in <module>
   from open3d._ml3d.datasets import *
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/open3d/_ml3d/datasets/__init__.py", line 5, in <module>
   from .semantickitti import SemanticKITTI
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/open3d/_ml3d/datasets/semantickitti.py", line 6, in <module>
   from sklearn.neighbors import KDTree
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/__init__.py", line 64, in <module>
   from .base import clone
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/base.py", line 13, in <module>
   from .utils.fixes import signature
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/utils/__init__.py", line 13, in <module>
   from .validation import (as_float_array,
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/utils/validation.py", line 27, in <module>
   from ..utils._joblib import Memory
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/utils/_joblib.py", line 18, in <module>
   from ..externals.joblib import __all__   # noqa
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/externals/joblib/__init__.py", line 119, in <module>
   from .parallel import Parallel
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/externals/joblib/parallel.py", line 32, in <module>
   from .externals.cloudpickle import dumps, loads
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/externals/joblib/externals/cloudpickle/__init__.py", line 3, in <module>
   from .cloudpickle import *
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/externals/joblib/externals/cloudpickle/cloudpickle.py", line 151, in <module>
   _cell_set_template_code = _make_cell_set_template_code()
   File "/home/muhammadmehdi/PycharmProjects/memex/venv/lib/python3.8/site-packages/sklearn/externals/joblib/externals/cloudpickle/cloudpickle.py", line 132, in _make_cell_set_template_code
   return types.CodeType(
   TypeError: an integer is required (got type bytes)

Expected behavior import open3d should work without error

Environment (please complete the following information):

• Operating system: Ubuntu 20.04
• Python version: Python 3.8
• Open3D version: 0.12.0
• Is this remote workstation?: no
• How did you install Open3D?: pip install open3d

Additional context I am using the Pycharm IDE

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I solved this problem by building open3d from source: http://www.open3d.org/docs/release/compilation.html