transformers

d5606378 - Optionally preprocess segmentation maps for MobileViT (#28420)

Optionally preprocess segmentation maps for MobileViT (#28420) * optionally preprocess segmentation maps for mobilevit * changed pretrained model name to that of segmentation model * removed voc-deeplabv3 from model archive list * added preprocess_image and preprocess_mask methods for processing images and segmentation masks respectively * added tests for segmentation masks based on segformer feature extractor * use crop_size instead of size * reverting to initial model