[Misc][Speculative decoding] Typos and typing fixes (#6467)

Co-authored-by: caishangming.csm <caishangming.csm@alibaba-inc.com>

vllm/spec_decode/multi_step_worker.py

@@ -43,7 +43,7 @@ class MultiStepWorker(Worker, ProposerWorkerBase):
         )
 
     def set_include_gpu_probs_tensor(self) -> None:
-        # Need include_gpu_probs_tensor for multi_step_worker
+        # Need include_gpu_probs_tensor for MultiStepWorker
         self.model_runner.model.sampler.include_gpu_probs_tensor = True
 
     @torch.inference_mode()

vllm/spec_decode/ngram_worker.py

@@ -13,7 +13,7 @@ from vllm.worker.worker_base import LoraNotSupportedWorkerBase
 class NGramWorker(NonLLMProposerWorkerBase, LoraNotSupportedWorkerBase):
     """NGramWorker provides a light drafter without need for model.
 
-    Current NGramWorker only implement prompt lookup decoding,
+    Current NGramWorker only implements prompt lookup decoding,
     and in future we may also do RAG type drafter and other scenarios
     which don't rely on LLM model to give proposals.
     """
@@ -37,7 +37,7 @@ class NGramWorker(NonLLMProposerWorkerBase, LoraNotSupportedWorkerBase):
         self.device = torch.device(f"cuda:{self.local_rank}")
         self.load_model = lambda *args, **kwargs: None
 
-        # Current only support Top1Proposer
+        # Current NGramWorker only supports Top1Proposer
         self._proposer = Top1Proposer(
             weakref.proxy(self),  # type: ignore[arg-type]
             device=self.device,

vllm/spec_decode/proposer_worker_base.py

@@ -24,7 +24,7 @@ class ProposerWorkerBase(LoraNotSupportedWorkerBase, SpeculativeProposer):
     ) -> Tuple[Optional[List[SamplerOutput]], bool]:
         raise NotImplementedError
 
-    def set_include_gpu_probs_tensor(self):
+    def set_include_gpu_probs_tensor(self) -> None:
         """Implementation optional"""
         pass
 

vllm/spec_decode/spec_decode_worker.py

@@ -206,7 +206,7 @@ class SpecDecodeWorker(LoraNotSupportedWorkerBase):
 
         self.probs_dtype = self.spec_decode_sampler.probs_dtype
         self.token_id_dtype = self.spec_decode_sampler.token_id_dtype
-        # Lazy initiazliation.
+        # Lazy initialization.
         self.scorer: SpeculativeScorer
 
         # Hidden states from target model to pass to proposer

vllm/spec_decode/top1_proposer.py

@@ -138,7 +138,7 @@ class Top1Proposer(SpeculativeProposer):
 
             # Currently only proposal lens of 0 or the global batch proposal len
             # are supported.
-            # If max_proposal_len is defined, then we shall no exccess this
+            # If max_proposal_len is defined, then we shall no exceed this
             # quota for nonzero_proposal
             new_k = 0
             if (self.max_proposal_len is None
@@ -219,7 +219,7 @@ class Top1Proposer(SpeculativeProposer):
         proposal_lens: List[int],
         nonzero_proposal_len_indices: List[int],
         sampler_transposed: bool,
-    ) -> Tuple[torch.Tensor, torch.tensor, torch.Tensor]:
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
         """After speculations are produced, merge the speculation results with
         the skipped sequences.
         """