[Code Quality] Add missing return type annotations to misc modules

Add return type annotations to functions in:
- vllm/version.py: _prev_minor_version_was(), _prev_minor_version()
- vllm/config/pooler.py: get_use_activation()
- vllm/multimodal/image.py: convert_image_mode()
- vllm/profiler/utils.py: trim_string_front(), trim_string_back()

Signed-off-by: yurekami <yurekami@users.noreply.github.com>

vllm/config/pooler.py

@@ -108,7 +108,7 @@ class PoolerConfig:
         return hash_str
 
 
-def get_use_activation(o: object):
+def get_use_activation(o: object) -> bool | None:
     if softmax := getattr(o, "softmax", None) is not None:
         logger.warning_once(
             "softmax will be deprecated and will be removed in v0.15. "

vllm/multimodal/image.py

@@ -38,7 +38,7 @@ def rgba_to_rgb(
     return converted
 
 
-def convert_image_mode(image: Image.Image, to_mode: str):
+def convert_image_mode(image: Image.Image, to_mode: str) -> Image.Image:
     if image.mode == to_mode:
         return image
     elif image.mode == "RGBA" and to_mode == "RGB":

vllm/profiler/utils.py

@@ -11,7 +11,7 @@ from torch._C._profiler import _EventType, _ProfilerEvent, _TensorMetadata
 #
 
 
-def trim_string_front(string, width):
+def trim_string_front(string: str, width: int) -> str:
     if len(string) > width:
         offset = len(string) - width + 3
         string = string[offset:]
@@ -20,7 +20,7 @@ def trim_string_front(string, width):
     return string
 
 
-def trim_string_back(string, width):
+def trim_string_back(string: str, width: int) -> str:
     if len(string) > width:
         offset = len(string) - width + 3
         string = string[:-offset]

vllm/version.py

@@ -12,7 +12,7 @@ except Exception as e:
     __version_tuple__ = (0, 0, __version__)
 
 
-def _prev_minor_version_was(version_str):
+def _prev_minor_version_was(version_str: str) -> bool:
     """Check whether a given version matches the previous minor version.
 
     Return True if version_str matches the previous minor version.
@@ -32,7 +32,7 @@ def _prev_minor_version_was(version_str):
     return version_str == f"{__version_tuple__[0]}.{__version_tuple__[1] - 1}"
 
 
-def _prev_minor_version():
+def _prev_minor_version() -> str:
     """For the purpose of testing, return a previous minor version number."""
     # In dev tree, this will return "0.-1", but that will work fine"
     assert isinstance(__version_tuple__[1], int)