Fix advanced profiler for python >=3.12

src/lightning/pytorch/profilers/advanced.py

@@ -19,6 +19,7 @@
 import os
 import pstats
 import tempfile
+from collections import defaultdict
 from pathlib import Path
 from typing import Optional, Union
 
@@ -66,14 +67,15 @@ def __init__(
                 If you attempt to stop recording an action which was never started.
         """
         super().__init__(dirpath=dirpath, filename=filename)
-        self.profiled_actions: dict[str, cProfile.Profile] = {}
+        self.profiled_actions: dict[str, cProfile.Profile] = defaultdict(cProfile.Profile)
         self.line_count_restriction = line_count_restriction
         self.dump_stats = dump_stats
 
     @override
     def start(self, action_name: str) -> None:
-        if action_name not in self.profiled_actions:
-            self.profiled_actions[action_name] = cProfile.Profile()
+        # Disable all profilers before starting a new one
+        for pr in self.profiled_actions.values():
+            pr.disable()
         self.profiled_actions[action_name].enable()
 
     @override
@@ -114,7 +116,7 @@ def summary(self) -> str:
     @override
     def teardown(self, stage: Optional[str]) -> None:
         super().teardown(stage=stage)
-        self.profiled_actions = {}
+        self.profiled_actions = defaultdict(cProfile.Profile)
 
     def __reduce__(self) -> tuple:
         # avoids `TypeError: cannot pickle 'cProfile.Profile' object`