Update dataset_stats() for HUB (#3536)

* Update `dataset_stats()` for HUB 

Cleanup of b6fdd2e

* autodownload flag

* Update general.py

* cleanup

utils/general.py

@@ -220,14 +220,14 @@ def check_file(file):
         return files[0]  # return file
 
 
-def check_dataset(dict):
+def check_dataset(data, autodownload=True):
     # Download dataset if not found locally
-    val, s = dict.get('val'), dict.get('download')
+    val, s = data.get('val'), data.get('download')
     if val and len(val):
         val = [Path(x).resolve() for x in (val if isinstance(val, list) else [val])]  # val path
         if not all(x.exists() for x in val):
             print('\nWARNING: Dataset not found, nonexistent paths: %s' % [str(x) for x in val if not x.exists()])
-            if s and len(s):  # download script
+            if s and len(s) and autodownload:  # download script
                 if s.startswith('http') and s.endswith('.zip'):  # URL
                     f = Path(s).name  # filename
                     print(f'Downloading {s} ...')