constants = dict(
    imagenet_rgb256_mean=[123.675, 116.28, 103.53],
    imagenet_rgb256_std=[58.395, 57.12, 57.375],
    imagenet_bgr256_mean=[103.530, 116.280, 123.675],
    # When using pre-trained models in Detectron1 or any MSRA models,
    # std has been absorbed into its conv1 weights, so the std needs to be set 1.
    # Otherwise, you can use [57.375, 57.120, 58.395] (ImageNet std)
    imagenet_bgr256_std=[1.0, 1.0, 1.0],
)