Update inference default to multi_label=False (#2252)

* Update inference default to multi_label=False

* bug fix

* Update plots.py

* Update plots.py

models/common.py

@@ -7,7 +7,7 @@ import numpy as np
 import requests
 import torch
 import torch.nn as nn
-from PIL import Image, ImageDraw
+from PIL import Image
 
 from utils.datasets import letterbox
 from utils.general import non_max_suppression, make_divisible, scale_coords, xyxy2xywh