Update check_install.py

Author: MMathisLab

dlclive/check_install/check_install.py

@@ -5,7 +5,8 @@
 Licensed under GNU Lesser General Public License v3.0
 """
 
-
+import os
+import urllib.request
 import sys
 import shutil
 import warnings
@@ -51,10 +52,12 @@ def main():
     model_dir = tmp_dir / 'DLC_Dog_resnet_50_iteration-0_shuffle-0'
 
     # download dog test video from github:
-    # TODO: Should check if the video's already there before downloading it (should have been cloned with the files)
-    print(f"Downloading Video to {video_file}")
-    url_link = "https://github.com/DeepLabCut/DeepLabCut-live/blob/main/check_install/dog_clip.avi?raw=True"
-    urllib.request.urlretrieve(url_link, video_file, reporthook=urllib_pbar)
+    if not os.path.exists(video_file):
+        print(f"Downloading Video to {video_file}")
+        url_link = "https://github.com/DeepLabCut/DeepLabCut-live/blob/main/check_install/dog_clip.avi?raw=True"
+        urllib.request.urlretrieve(url_link, video_file, reporthook=urllib_pbar)
+    else:
+        print(f"Video already exists at {video_file}")
 
     # download model from the DeepLabCut Model Zoo
     if Path(model_dir / SNAPSHOT_NAME).exists():