`ultralytics 8.3.42` update AutoBackend `names` placeholder (#17970)

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

ultralytics/__init__.py

@@ -1,6 +1,6 @@
 # Ultralytics YOLO 🚀, AGPL-3.0 license
 
-__version__ = "8.3.40"
+__version__ = "8.3.42"
 
 import os
 

ultralytics/nn/autobackend.py

@@ -700,8 +700,7 @@ class AutoBackend(nn.Module):
         #     print(type(x), len(x)) if isinstance(x, (list, tuple)) else print(type(x), x.shape)  # debug shapes
         if isinstance(y, (list, tuple)):
             if len(self.names) == 999 and (self.task == "segment" or len(y) == 2):  # segments and names not defined
-                ip, ib = (0, 1) if len(y[0].shape) == 4 else (1, 0)  # index of protos, boxes
-                nc = y[ib].shape[1] - y[ip].shape[3] - 4  # y = (1, 160, 160, 32), (1, 116, 8400)
+                nc = y[0].shape[1] - y[1].shape[1] - 4  # y = (1, 32, 160, 160), (1, 116, 8400)
                 self.names = {i: f"class{i}" for i in range(nc)}
             return self.from_numpy(y[0]) if len(y) == 1 else [self.from_numpy(x) for x in y]
         else: