Fix device counting method to account for double-digit device IDs (ul…

…tralytics#8502)

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

ultralytics/utils/torch_utils.py

@@ -115,7 +115,7 @@ def select_device(device="", batch=0, newline=False, verbose=True):
             device = "0"
         visible = os.environ.get("CUDA_VISIBLE_DEVICES", None)
         os.environ["CUDA_VISIBLE_DEVICES"] = device  # set environment variable - must be before assert is_available()
-        if not (torch.cuda.is_available() and torch.cuda.device_count() >= len(device.replace(",", ""))):
+        if not (torch.cuda.is_available() and torch.cuda.device_count() >= len(device.split(","))):
             LOGGER.info(s)
             install = (
                 "See https://pytorch.org/get-started/locally/ for up-to-date torch install instructions if no "