Fix cuda mp (#2023)

Author: mikel-brostrom

boxmot/engine/cli.py

@@ -37,7 +37,7 @@ def main():
     )
     common_parser.add_argument('--imgsz', '--img-size', nargs='+', type=int,
                                default=None, help='inference size h,w')
-    common_parser.add_argument('--fps', type=int, default=None,
+    common_parser.add_argument('--fps', type=int, default=30,
                                help='video frame-rate')
     common_parser.add_argument('--conf', type=float, default=0.01,
                                help='min confidence threshold')

boxmot/engine/val.py

@@ -1,6 +1,8 @@
-
 # Mikel Broström 🔥 Yolo Tracking 🧾 AGPL-3.0 license
 
+import multiprocessing as mp
+mp.set_start_method("spawn", force=True)
+
 import argparse
 import subprocess
 from pathlib import Path
@@ -151,8 +153,6 @@ def generate_dets_embs(args: argparse.Namespace, y: Path, source: Path) -> None:
                 np.savetxt(f, embs, fmt='%f')
 
 
-import re
-
 def parse_mot_results(results: str) -> dict:
     """
     Extracts COMBINED HOTA, MOTA, IDF1, AssA, AssRe, IDSW, and IDs from MOTChallenge evaluation output.