qjiang002

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## Custom features Now users can specify custom features in either the [output json file](https://github.com/neulab/ExplainaBoard/blob/main/docs/add_custom_features.md) or a [global config file](https://github.com/neulab/ExplainaBoard/blob/main/explainaboard/resources/dataset_custom_features.json). Potential improvements are: * Only json output file can support...