Switch to unified view

a b/processed/train/state.json
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{
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  "_data_files": [
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    {
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      "filename": "data-00000-of-00001.arrow"
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    }
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  ],
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  "_fingerprint": "a09d34e966a2bb9e",
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  "_format_columns": [
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    "image",
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    "target"
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  ],
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  "_format_kwargs": {},
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  "_format_type": null,
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  "_output_all_columns": false,
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  "_split": null
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}