[Fix] ConcatDataset raise error when metainfo is np.array

[jonbakerfish]

When metainfo is N-dim np.array and is the same, the ConcatDataset will raise the following errors:

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

This is caused by the != comparation of np.array

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Motivation

bug fix

Modification

ConcatDataset in dataset_wrapper.py

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

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Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDetection or MMPretrain.
4. The documentation has been modified accordingly, like docstring or example tutorials.

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[zhouzaida]

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[zhouzaida]

BTW, please refer to https://mmengine.readthedocs.io/en/latest/notes/contributing.html#configure-pre-commit to fix the lint issue.