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processed_dataset = flat_dataset.map(preprocess_data, batched=True, remove_columns=['question','question_type',  'question_id', 'image_id', 'answer_type', 'label.ids', 'label.weights'])
processed_dataset
Dataset({
    features: ['input_ids', 'token_type_ids', 'attention_mask', 'pixel_values', 'pixel_mask', 'labels'],
    num_rows: 200
})

As a final step, create a batch of examples using [DefaultDataCollator]:

from transformers import DefaultDataCollator
data_collator = DefaultDataCollator()

Train the model
You’re ready to start training your model now!