Add start_token parameter to prediction function

Closes #40 (closed)

dan/predict/prediction.py

@@ -6,9 +6,9 @@ import re
 
 import cv2
 import numpy as np
-
 import torch
 import yaml
+
 from dan import logger
 from dan.datasets.extract.utils import save_json
 from dan.decoder import GlobalHTADecoder