fix attributes field as serielized json dict

data/train/train_0.json

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data/train/train_1.json

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data/train/train_10.json

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+size 19430090

data/train/train_2.json

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+size 392229994

data/train/train_3.json

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+size 464330358

data/train/train_4.json

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+size 433830402

data/train/train_5.json

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+size 430404621

data/train/train_6.json

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+size 370441075

data/train/train_7.json

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+size 423436629

data/train/train_8.json

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data/train/train_9.json

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