Fix relative `ROOT` Pytorch Hub custom model bug (#4974)

models/tf.py

@@ -20,7 +20,7 @@ FILE = Path(__file__).resolve()
 ROOT = FILE.parents[1]  # YOLOv5 root directory
 if str(ROOT) not in sys.path:
     sys.path.append(str(ROOT))  # add ROOT to PATH
-ROOT = ROOT.relative_to(Path.cwd())  # relative
+# ROOT = ROOT.relative_to(Path.cwd())  # relative
 
 import numpy as np
 import tensorflow as tf

models/yolo.py

@@ -15,7 +15,7 @@ FILE = Path(__file__).resolve()
 ROOT = FILE.parents[1]  # YOLOv5 root directory
 if str(ROOT) not in sys.path:
     sys.path.append(str(ROOT))  # add ROOT to PATH
-ROOT = ROOT.relative_to(Path.cwd())  # relative
+# ROOT = ROOT.relative_to(Path.cwd())  # relative
 
 from models.common import *
 from models.experimental import *