[UnitTest] Fixing AttributeError: module 'numpy' has no attribute exceptions

[drivanov]

Description

This PR fixes a bug:

Line 3180: =================================== FAILURES ===================================
Line 3181: _________________ test_global_uniform_negative_sampling[int32] _________________
Line 3247: _________________ test_global_uniform_negative_sampling[int64] _________________
Line 3255: tests/python/common/sampling/test_sampling.py:1777:
Line 3256: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Line 3308: >       raise AttributeError("module {!r} has no attribute "
Line 3309:                              "{!r}".format(__name__, attr))
Line 3310: E       AttributeError: module 'numpy' has no attribute 'exceptions'
Line 3312: /usr/local/lib/python3.10/dist-packages/numpy/__init__.py:320: AttributeError
Line 3427: =========================== short test summary info ============================
Line 3428: FAILED tests/python/common/sampling/test_sampling.py::test_global_uniform_negative_sampling[int32]
Line 3429: FAILED tests/python/common/sampling/test_sampling.py::test_global_uniform_negative_sampling[int64]

where common/sampling/test_sampling.py::test_global_uniform_negative_sampling test fails.

Checklist

Please feel free to remove inapplicable items for your PR.

• The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
• I've leverage the tools to beautify the python and c++ code.
• The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
• To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

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[TristonC]

LGTM

[mfbalin]

@dgl-bot

[drivanov]

The issue described in the PR for common/sampling/test_sampling.py::test_global_uniform_negative_sampling was observed in Python 3.10.

Line 3310: E       AttributeError: module 'numpy' has no attribute 'exceptions'
Line 3312: /usr/local/lib/python3.10/dist-packages/numpy/__init__.py:320: AttributeError

However, this problem does not appear in Python 3.12.