Multi-GPU disabled in test.py

test.py

 import argparse
 import json
 
-import yaml
 from torch.utils.data import DataLoader
 
 from utils.datasets import *
@@ -40,8 +39,9 @@ def test(data,
         if half:
             model.half()  # to FP16
 
-        if device.type != 'cpu' and torch.cuda.device_count() > 1:
-            model = nn.DataParallel(model)
+        # Multi-GPU disabled, incompatible with .half()
+        # if device.type != 'cpu' and torch.cuda.device_count() > 1:
+        #     model = nn.DataParallel(model)
 
     else:  # called by train.py
         training = True