GitHub API rate limit fallback (#1661)

Author: glenn-jocher

utils/google_utils.py

@@ -16,28 +16,32 @@ def gsutil_getsize(url=''):
     return eval(s.split(' ')[0]) if len(s) else 0  # bytes
 
 
-def attempt_download(file):
+def attempt_download(file, repo='ultralytics/yolov3'):
     # Attempt file download if does not exist
     file = Path(str(file).strip().replace("'", '').lower())
 
     if not file.exists():
-        response = requests.get('https://api.github.com/repos/ultralytics/yolov3/releases/latest').json()  # github api
-        assets = [x['name'] for x in response['assets']]  # release assets ['yolov3.pt', 'yolov3-spp.pt', ...]
-        name = file.name
+        try:
+            response = requests.get(f'https://api.github.com/repos/{repo}/releases/latest').json()  # github api
+            assets = [x['name'] for x in response['assets']]  # release assets, i.e. ['yolov5s.pt', 'yolov5m.pt', ...]
+            tag = response['tag_name']  # i.e. 'v1.0'
+        except:  # fallback plan
+            assets = ['yolov3.pt', 'yolov3-spp.pt', 'yolov3-tiny.pt']
+            tag = subprocess.check_output('git tag', shell=True).decode('utf-8').split('\n')[-2]
 
+        name = file.name
         if name in assets:
-            msg = f'{file} missing, try downloading from https://github.com/ultralytics/yolov3/releases/'
+            msg = f'{file} missing, try downloading from https://github.com/{repo}/releases/'
             redundant = False  # second download option
             try:  # GitHub
-                tag = response['tag_name']  # i.e. 'v1.0'
-                url = f'https://github.com/ultralytics/yolov3/releases/download/{tag}/{name}'
+                url = f'https://github.com/{repo}/releases/download/{tag}/{name}'
                 print(f'Downloading {url} to {file}...')
                 torch.hub.download_url_to_file(url, file)
                 assert file.exists() and file.stat().st_size > 1E6  # check
             except Exception as e:  # GCP
                 print(f'Download error: {e}')
                 assert redundant, 'No secondary mirror'
-                url = f'https://storage.googleapis.com/ultralytics/yolov3/ckpt/{name}'
+                url = f'https://storage.googleapis.com/{repo}/ckpt/{name}'
                 print(f'Downloading {url} to {file}...')
                 os.system(f'curl -L {url} -o {file}')  # torch.hub.download_url_to_file(url, weights)
             finally: