added yolov8x download utils + update README.md (#898)

Co-authored-by: fatih <34196005+fcakyon@users.noreply.github.com>

Author: pranavdurai10

README.md

@@ -266,4 +266,6 @@ python -m scripts.run_code_style format
 
 <a align="left" href="https://github.com/aynursusuz" target="_blank">Aynur Susuz</a>
 
-</div>
+<a align="left" href="https://github.com/pranavdurai10" target="_blank">Pranav Durai</a>
+
+</div>

sahi/utils/yolov8.py

@@ -17,6 +17,9 @@ class Yolov8TestConstants:
     YOLOV8M_MODEL_URL = "https://github.com/ultralytics/assets/releases/download/v0.0.0/yolov8l.pt"
     YOLOV8M_MODEL_PATH = "tests/data/models/yolov8/yolov8l.pt"
 
+    YOLOV8M_MODEL_URL = "https://github.com/ultralytics/assets/releases/download/v0.0.0/yolov8x.pt"
+    YOLOV8M_MODEL_PATH = "tests/data/models/yolov8/yolov8x.pt"
+
 
 def download_yolov8n_model(destination_path: Optional[str] = None):
     if destination_path is None:
@@ -68,3 +71,16 @@ def download_yolov8l_model(destination_path: Optional[str] = None):
             Yolov8TestConstants.YOLOV8L_MODEL_URL,
             destination_path,
         )
+
+
+def download_yolov8x_model(destination_path: Optional[str] = None):
+    if destination_path is None:
+        destination_path = Yolov8TestConstants.YOLOV8X_MODEL_PATH
+
+    Path(destination_path).parent.mkdir(parents=True, exist_ok=True)
+
+    if not path.exists(destination_path):
+        urllib.request.urlretrieve(
+            Yolov8TestConstants.YOLOV8X_MODEL_URL,
+            destination_path,
+        )