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Empty OCR targets for several event_ocr samples with visible text #3

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@HYLZ-2019

Hi, thanks for releasing EventBench.

I noticed several event_ocr samples whose ground-truth target is an empty string, but the stacked event visualization appears to contain readable text. This can incorrectly reward blank OCR predictions.

Examples:

File Current target Visible text
event_ocr/recording_2023-03-09_19-05-52.npz "" SPA
event_ocr/recording_2023-03-09_14-11-35.npz "" 理:摩托车 电动车 档位车
event_ocr/recording_2023-04-01_15-15-17.npz "" 浦电路155号
event_ocr/recording_2023-03-09_14-19-39.npz "" 巨鳌轴承

Could you please check whether these OCR annotations should be updated?

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