Syntax fixes

train.py

@@ -50,7 +50,7 @@ def train(hyp):
     os.makedirs(wdir, exist_ok=True)
     last = wdir + 'last.pt'
     best = wdir + 'best.pt'
-    results_file = log_dir + 'results.txt'
+    results_file = log_dir + os.sep + 'results.txt'
 
     epochs = opt.epochs  # 300
     batch_size = opt.batch_size  # 64
@@ -303,7 +303,7 @@ def train(hyp):
                                              model=ema.ema,
                                              single_cls=opt.single_cls,
                                              dataloader=testloader,
-                                             fast=epoch < epochs / 2
+                                             fast=epoch < epochs / 2,
                                              save_dir=log_dir)
 
         # Write