Modernization of typehints in llmcompressor/core/lifecycle.py (#1934)

This PR refactors llmcompressor/core/lifecycle.py for improved
readability, consistency, and adherence to modern Python style
conventions.

---------

Co-authored-by: Rahul Tuli <[email protected]>

Author: siddhaka

src/llmcompressor/core/lifecycle.py

@@ -6,7 +6,7 @@
 """
 
 from dataclasses import dataclass, field
-from typing import Any, List, Optional
+from typing import Any
 
 from loguru import logger
 
@@ -23,11 +23,11 @@ class CompressionLifecycle:
     A class for managing the lifecycle of compression events in the LLM Compressor.
 
     :param state: The current state of the compression process
-    :type state: Optional[State]
+    :type state: State
     :param recipe: The compression recipe
     :type recipe: Recipe
     :param modifiers: The list of stage modifiers
-    :type modifiers: List[StageModifiers]
+    :type modifiers: list[StageModifiers]
     """
 
     state: State = field(default_factory=State)
@@ -37,8 +37,8 @@ class CompressionLifecycle:
     finalized: bool = False
 
     # event order validation
-    _last_event_type: Optional[EventType] = EventType.BATCH_END
-    _event_order: List[EventType] = field(
+    _last_event_type: EventType | None = EventType.BATCH_END
+    _event_order: list[EventType] = field(
         default_factory=lambda: [
             EventType.BATCH_START,
             EventType.LOSS_CALCULATED,
@@ -72,11 +72,11 @@ def reset(self):
 
     def initialize(
         self,
-        recipe: Optional[RecipeInput] = None,
-        recipe_stage: Optional[RecipeStageInput] = None,
-        recipe_args: Optional[RecipeArgsInput] = None,
+        recipe: RecipeInput | None = None,
+        recipe_stage: RecipeStageInput | None = None,
+        recipe_args: RecipeArgsInput | None = None,
         **kwargs,
-    ) -> List[Any]:
+    ) -> list[Any]:
         """
         Initialize the compression lifecycle.
 
@@ -114,7 +114,7 @@ def initialize(
 
         return mod_data
 
-    def finalize(self, **kwargs) -> List[Any]:
+    def finalize(self, **kwargs) -> list[Any]:
         """
         Finalize the compression lifecycle.
 
@@ -149,8 +149,8 @@ def finalize(self, **kwargs) -> List[Any]:
         return mod_data
 
     def event(
-        self, event_type: EventType, global_step: Optional[int] = 0, **kwargs
-    ) -> List[Any]:
+        self, event_type: EventType, global_step: int | None = 0, **kwargs
+    ) -> list[Any]:
         """
         Handle a compression event.