disable torch.compile for mps, give clearer error messages, fix #2244

nnunetv2/training/nnUNetTrainer/nnUNetTrainer.py

@@ -238,13 +238,24 @@ def initialize(self):
     def _do_i_compile(self):
         # new default: compile is enabled!
 
+        # compile does not work on mps
+        if self.device == torch.device('mps'):
+            if 'nnUNet_compile' in os.environ.keys() and os.environ['nnUNet_compile'].lower() in ('true', '1', 't'):
+                self.print_to_log_file("INFO: torch.compile disabled because of unsupported mps device")
+            return False
+
         # CPU compile crashes for 2D models. Not sure if we even want to support CPU compile!? Better disable
         if self.device == torch.device('cpu'):
+            if 'nnUNet_compile' in os.environ.keys() and os.environ['nnUNet_compile'].lower() in ('true', '1', 't'):
+                self.print_to_log_file("INFO: torch.compile disabled because device is CPU")
             return False
 
         # default torch.compile doesn't work on windows because there are apparently no triton wheels for it
         # https://discuss.pytorch.org/t/windows-support-timeline-for-torch-compile/182268/2
         if os.name == 'nt':
+            if 'nnUNet_compile' in os.environ.keys() and os.environ['nnUNet_compile'].lower() in ('true', '1', 't'):
+                self.print_to_log_file("INFO: torch.compile disabled because Windows is not natively supported. If "
+                                       "you know what you are doing, check https://discuss.pytorch.org/t/windows-support-timeline-for-torch-compile/182268/2")
             return False
 
         if 'nnUNet_compile' not in os.environ.keys():