[Misc] Remove redundant TypeVar from base model (vllm-project#12248)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

vllm/model_executor/models/interfaces_base.py

@@ -3,7 +3,6 @@
 
 import torch
 import torch.nn as nn
-from transformers import PretrainedConfig
 from typing_extensions import TypeIs, TypeVar
 
 from vllm.logger import init_logger
@@ -19,9 +18,6 @@
 
 logger = init_logger(__name__)
 
-# The type of HF config
-C_co = TypeVar("C_co", bound=PretrainedConfig, covariant=True)
-
 # The type of hidden states
 # Currently, T = torch.Tensor for all models except for Medusa
 # which has T = List[torch.Tensor]
@@ -34,7 +30,7 @@
 
 
 @runtime_checkable
-class VllmModel(Protocol[C_co, T_co]):
+class VllmModel(Protocol[T_co]):
     """The interface required for all models in vLLM."""
 
     def __init__(
@@ -97,7 +93,7 @@ def is_vllm_model(
 
 
 @runtime_checkable
-class VllmModelForTextGeneration(VllmModel[C_co, T], Protocol[C_co, T]):
+class VllmModelForTextGeneration(VllmModel[T], Protocol[T]):
     """The interface required for all generative models in vLLM."""
 
     def compute_logits(
@@ -143,7 +139,7 @@ def is_text_generation_model(
 
 
 @runtime_checkable
-class VllmModelForPooling(VllmModel[C_co, T], Protocol[C_co, T]):
+class VllmModelForPooling(VllmModel[T], Protocol[T]):
     """The interface required for all pooling models in vLLM."""
 
     def pooler(