[Core] Simplifications to executor classes (#4071)

vllm/executor/cpu_executor.py

 import os
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Set, Tuple
 
 import torch
 
-from vllm.config import (CacheConfig, DeviceConfig, LoRAConfig, ModelConfig,
-                         ParallelConfig, SchedulerConfig)
+from vllm.config import CacheConfig, ModelConfig, SchedulerConfig
 from vllm.executor.executor_base import ExecutorBase
 from vllm.logger import init_logger
 from vllm.lora.request import LoRARequest
@@ -16,23 +15,13 @@ logger = init_logger(__name__)
 
 class CPUExecutor(ExecutorBase):
 
-    def __init__(self, model_config: ModelConfig, cache_config: CacheConfig,
-                 parallel_config: ParallelConfig,
-                 scheduler_config: SchedulerConfig,
-                 device_config: DeviceConfig,
-                 lora_config: Optional[LoRAConfig], *args, **kwargs) -> None:
-        assert device_config.device_type == "cpu"
-        assert lora_config is None, "cpu backend doesn't support LoRA"
-        model_config = _verify_and_get_model_config(model_config)
-        cache_config = _verify_and_get_cache_config(cache_config)
-        scheduler_config = _verify_and_get_scheduler_config(scheduler_config)
-
-        self.model_config = model_config
-        self.cache_config = cache_config
-        self.lora_config = lora_config
-        self.parallel_config = parallel_config
-        self.scheduler_config = scheduler_config
-        self.device_config = device_config
+    def _init_executor(self) -> None:
+        assert self.device_config.device_type == "cpu"
+        assert self.lora_config is None, "cpu backend doesn't support LoRA"
+        self.model_config = _verify_and_get_model_config(self.model_config)
+        self.cache_config = _verify_and_get_cache_config(self.cache_config)
+        self.scheduler_config = _verify_and_get_scheduler_config(
+            self.scheduler_config)
 
         # Instantiate the worker and load the model to CPU.
         self._init_worker()
@@ -99,7 +88,7 @@ class CPUExecutor(ExecutorBase):
     def remove_lora(self, lora_id: int) -> bool:
         return self.driver_worker.remove_lora(lora_id)
 
-    def list_loras(self) -> List[int]:
+    def list_loras(self) -> Set[int]:
         return self.driver_worker.list_loras()
 
     def check_health(self) -> None:

vllm/executor/executor_base.py

 from abc import ABC, abstractmethod
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Optional, Set, Tuple
 
 from vllm.config import (CacheConfig, DeviceConfig, LoRAConfig, ModelConfig,
                          ParallelConfig, SchedulerConfig, SpeculativeConfig,
-                         VisionLanguageConfig)
+                         TensorizerConfig, VisionLanguageConfig)
 from vllm.lora.request import LoRARequest
 from vllm.sequence import SamplerOutput, SequenceGroupMetadata
 
@@ -16,7 +16,6 @@ class ExecutorBase(ABC):
     that can execute the model on multiple devices.
     """
 
-    @abstractmethod
     def __init__(
         self,
         model_config: ModelConfig,
@@ -27,8 +26,23 @@ class ExecutorBase(ABC):
         lora_config: Optional[LoRAConfig],
         vision_language_config: Optional[VisionLanguageConfig],
         speculative_config: Optional[SpeculativeConfig],
+        tensorizer_config: Optional[TensorizerConfig],
     ) -> None:
-        raise NotImplementedError
+        self.model_config = model_config
+        self.cache_config = cache_config
+        self.lora_config = lora_config
+        self.parallel_config = parallel_config
+        self.scheduler_config = scheduler_config
+        self.device_config = device_config
+        self.vision_language_config = vision_language_config
+        self.speculative_config = speculative_config
+        self.tensorizer_config = tensorizer_config
+
+        self._init_executor()
+
+    @abstractmethod
+    def _init_executor(self) -> None:
+        pass
 
     @abstractmethod
     def determine_num_available_blocks(self) -> Tuple[int, int]:
@@ -71,7 +85,7 @@ class ExecutorBase(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def list_loras(self) -> List[int]:
+    def list_loras(self) -> Set[int]:
         raise NotImplementedError
 
     @abstractmethod
@@ -94,8 +108,7 @@ class ExecutorAsyncBase(ExecutorBase):
         """Executes one model step on the given sequences."""
         raise NotImplementedError
 
-    @abstractmethod
     async def check_health_async(self) -> None:
         """Checks if the executor is healthy. If not, it should raise an
         exception."""
-        raise NotImplementedError
+        self.check_health()

vllm/executor/gpu_executor.py

-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Set, Tuple
 
-from vllm.config import (CacheConfig, DeviceConfig, LoRAConfig, ModelConfig,
-                         ParallelConfig, SchedulerConfig, SpeculativeConfig,
-                         TensorizerConfig, VisionLanguageConfig)
 from vllm.executor.executor_base import ExecutorAsyncBase, ExecutorBase
 from vllm.logger import init_logger
 from vllm.lora.request import LoRARequest
@@ -15,24 +12,8 @@ logger = init_logger(__name__)
 
 class GPUExecutor(ExecutorBase):
 
-    def __init__(self, model_config: ModelConfig, cache_config: CacheConfig,
-                 parallel_config: ParallelConfig,
-                 scheduler_config: SchedulerConfig,
-                 device_config: DeviceConfig,
-                 lora_config: Optional[LoRAConfig],
-                 vision_language_config: Optional[VisionLanguageConfig],
-                 speculative_config: Optional[SpeculativeConfig],
-                 tensorizer_config: Optional[TensorizerConfig]) -> None:
-        self.model_config = model_config
-        self.cache_config = cache_config
-        self.lora_config = lora_config
-        self.parallel_config = parallel_config
-        self.scheduler_config = scheduler_config
-        self.device_config = device_config
-        self.vision_language_config = vision_language_config
-        self.tensorizer_config = tensorizer_config
-
-        assert (not speculative_config
+    def _init_executor(self) -> None:
+        assert (not self.speculative_config
                 ), "Speculative decoding not yet supported for GPU backend"
 
         # Instantiate the worker and load the model to GPU.
@@ -103,7 +84,7 @@ class GPUExecutor(ExecutorBase):
         assert lora_id > 0, "lora_id must be greater than 0."
         return self.driver_worker.remove_lora(lora_id)
 
-    def list_loras(self) -> List[int]:
+    def list_loras(self) -> Set[int]:
         return self.driver_worker.list_loras()
 
     def check_health(self) -> None:
@@ -127,8 +108,3 @@ class GPUExecutorAsync(GPUExecutor, ExecutorAsyncBase):
             blocks_to_swap_out=blocks_to_swap_out,
             blocks_to_copy=blocks_to_copy)
         return output
-
-    async def check_health_async(self) -> None:
-        # GPUExecutor will always be healthy as long as
-        # it's running.
-        return

vllm/executor/neuron_executor.py

-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Set, Tuple
 
-from vllm.config import (CacheConfig, DeviceConfig, LoRAConfig, ModelConfig,
-                         ParallelConfig, SchedulerConfig, SpeculativeConfig,
-                         VisionLanguageConfig)
 from vllm.executor.executor_base import ExecutorBase
 from vllm.logger import init_logger
 from vllm.lora.request import LoRARequest
@@ -13,24 +10,10 @@ logger = init_logger(__name__)
 
 class NeuronExecutor(ExecutorBase):
 
-    def __init__(
-        self,
-        model_config: ModelConfig,
-        cache_config: CacheConfig,
-        parallel_config: ParallelConfig,
-        scheduler_config: SchedulerConfig,
-        device_config: DeviceConfig,
-        lora_config: Optional[LoRAConfig],
-        vision_language_config: Optional[VisionLanguageConfig],
-        speculative_config: Optional[SpeculativeConfig],
-    ) -> None:
-        self.model_config = model_config
-        self.cache_config = cache_config
-        assert lora_config is None, "LoRA is not supported for Neuron backend."
-        self.parallel_config = parallel_config
-        self.scheduler_config = scheduler_config
-        self.device_config = device_config
-        assert (not speculative_config
+    def _init_executor(self) -> None:
+        assert (self.lora_config is
+                None), "LoRA is not supported for Neuron backend."
+        assert (not self.speculative_config
                 ), "Speculative decoding not yet supported for Neuron backend."
 
         # Instantiate the worker and load the model to the device.
@@ -80,7 +63,7 @@ class NeuronExecutor(ExecutorBase):
     def remove_lora(self, lora_id: int) -> bool:
         return self.driver_worker.remove_lora(lora_id)
 
-    def list_loras(self) -> List[int]:
+    def list_loras(self) -> Set[int]:
         return self.driver_worker.list_loras()
 
     def check_health(self) -> None:

vllm/executor/ray_gpu_executor.py

@@ -3,11 +3,8 @@ import copy
 import os
 import pickle
 from collections import defaultdict
-from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Set, Tuple
 
-from vllm.config import (CacheConfig, DeviceConfig, LoRAConfig, ModelConfig,
-                         ParallelConfig, SchedulerConfig, SpeculativeConfig,
-                         TensorizerConfig, VisionLanguageConfig)
 from vllm.engine.ray_utils import RayWorkerVllm, ray
 from vllm.executor.executor_base import ExecutorAsyncBase, ExecutorBase
 from vllm.logger import init_logger
@@ -32,27 +29,8 @@ USE_RAY_COMPILED_DAG = bool(os.getenv("VLLM_USE_RAY_COMPILED_DAG", 0))
 
 class RayGPUExecutor(ExecutorBase):
 
-    def __init__(
-        self,
-        model_config: ModelConfig,
-        cache_config: CacheConfig,
-        parallel_config: ParallelConfig,
-        scheduler_config: SchedulerConfig,
-        device_config: DeviceConfig,
-        lora_config: Optional[LoRAConfig],
-        vision_language_config: Optional[VisionLanguageConfig],
-        speculative_config: Optional[SpeculativeConfig],
-        tensorizer_config: Optional[TensorizerConfig],
-    ) -> None:
-        self.model_config = model_config
-        self.cache_config = cache_config
-        self.lora_config = lora_config
-        self.parallel_config = parallel_config
-        self.scheduler_config = scheduler_config
-        self.device_config = device_config
-        self.vision_language_config = vision_language_config
-        self.tensorizer_config = tensorizer_config
-        assert (not speculative_config
+    def _init_executor(self) -> None:
+        assert (not self.speculative_config
                 ), "Speculative decoding not yet supported for RayGPU backend."
 
         assert self.parallel_config.worker_use_ray
@@ -273,7 +251,7 @@ class RayGPUExecutor(ExecutorBase):
             lora_id=lora_id,
         )
 
-    def list_loras(self) -> List[int]:
+    def list_loras(self) -> Set[int]:
         return self._run_workers("list_loras")
 
     def _run_workers(
@@ -416,7 +394,3 @@ class RayGPUExecutorAsync(RayGPUExecutor, ExecutorAsyncBase):
         # Only the driver worker returns the sampling results.
         output = all_outputs[0]
         return output
-
-    async def check_health_async(self) -> None:
-        """Raises an error if engine is unhealthy."""
-        self._check_if_any_actor_is_dead()