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tta_model = dict(
    type='DetTTAModel',
    tta_cfg=dict(nms=dict(type='nms', iou_threshold=0.5), max_per_img=100))

img_scales = [(1333, 800), (666, 400), (2000, 1200)]
tta_pipeline = [
    dict(type='LoadImageFromFile', backend_args=None),
    dict(
        type='TestTimeAug',
        transforms=[[
            dict(type='Resize', scale=s, keep_ratio=True) for s in img_scales
        ], [
            dict(type='RandomFlip', prob=1.),
            dict(type='RandomFlip', prob=0.)
        ], [dict(type='LoadAnnotations', with_bbox=True)],
                    [
                        dict(
                            type='PackDetInputs',
                            meta_keys=('img_id', 'img_path', 'ori_shape',
                                       'img_shape', 'scale_factor', 'flip',
                                       'flip_direction'))
                    ]])
]