Update script headers (#4163)

* Update download script headers

* cleanup

* bug fix attempt

* bug fix attempt2

* bug fix attempt3

* cleanup

train.py

@@ -78,8 +78,9 @@ def train(hyp,  # path/to/hyp.yaml or hyp dictionary
     plots = not evolve  # create plots
     cuda = device.type != 'cpu'
     init_seeds(1 + RANK)
-    with open(data) as f:
-        data_dict = yaml.safe_load(f)  # data dict
+    with open(data, encoding='ascii', errors='ignore') as f:
+        data_dict = yaml.safe_load(f)
+
     nc = 1 if single_cls else int(data_dict['nc'])  # number of classes
     names = ['item'] if single_cls and len(data_dict['names']) != 1 else data_dict['names']  # class names
     assert len(names) == nc, f'{len(names)} names found for nc={nc} dataset in {data}'  # check