[Misc] Misc code simplifications (#26450)

Signed-off-by: Nick Hill <nhill@redhat.com>

vllm/v1/core/sched/scheduler.py

@@ -1474,7 +1474,7 @@ class Scheduler(SchedulerInterface):
 
                 affected_req_ids.add(request.request_id)
 
-        return (affected_req_ids, total_affected_tokens)
+        return affected_req_ids, total_affected_tokens
 
     def _handle_invalid_blocks(self, invalid_block_ids: set[int]) -> set[str]:
         total_requests_to_reschedule = 0

vllm/v1/core/sched/utils.py

@@ -59,8 +59,7 @@ def check_stop(
     sampling_params = request.sampling_params
     assert sampling_params is not None
 
-    min_tokens = sampling_params.min_tokens
-    if request.num_output_tokens < min_tokens:
+    if request.num_output_tokens < sampling_params.min_tokens:
         return False
 
     last_token_id = request.output_token_ids[-1]

vllm/v1/sample/rejection_sampler.py

@@ -147,22 +147,20 @@ class RejectionSampler(nn.Module):
         sampling_metadata: SamplingMetadata,
         metadata: SpecDecodeMetadata,
     ) -> torch.Tensor:
+        has_penalties = not sampling_metadata.no_penalties
         any_penalties_or_bad_words = (
-            sampling_metadata.bad_words_token_ids or not sampling_metadata.no_penalties
+            sampling_metadata.bad_words_token_ids or has_penalties
         )
 
         output_token_ids = sampling_metadata.output_token_ids
         if any_penalties_or_bad_words:
             output_token_ids = self._combine_outputs_with_spec_tokens(
-                sampling_metadata.output_token_ids,
+                output_token_ids,
                 sampling_metadata.spec_token_ids,
             )
 
         # Calculate indices of target logits.
-        if (
-            sampling_metadata.allowed_token_ids_mask is not None
-            or not sampling_metadata.no_penalties
-        ):
+        if sampling_metadata.allowed_token_ids_mask is not None or has_penalties:
             num_requests = len(sampling_metadata.output_token_ids)
             num_draft_tokens = torch.tensor(metadata.num_draft_tokens, device="cpu")
             original_indices = torch.arange(num_requests, device="cpu")
@@ -180,18 +178,15 @@ class RejectionSampler(nn.Module):
                 logits.masked_fill_(token_mask, float("-inf"))
 
         # Apply bad words exclusion.
-        if sampling_metadata.bad_words_token_ids:
+        if bad_words_token_ids := sampling_metadata.bad_words_token_ids:
             apply_bad_words_with_drafts(
-                logits,
-                sampling_metadata.bad_words_token_ids,
-                output_token_ids,
-                metadata.num_draft_tokens,
+                logits, bad_words_token_ids, output_token_ids, metadata.num_draft_tokens
             )
 
         return logits
 
+    @staticmethod
     def apply_penalties(
-        self,
         logits: torch.Tensor,
         sampling_metadata: SamplingMetadata,
         metadata: SpecDecodeMetadata,
@@ -218,8 +213,8 @@ class RejectionSampler(nn.Module):
         )
         return logits
 
+    @staticmethod
     def _combine_outputs_with_spec_tokens(
-        self,
         output_token_ids: list[list[int]],
         spec_token_ids: Optional[list[list[int]]] = None,
     ) -> list[list[int]]:

vllm/v1/sample/sampler.py

@@ -120,8 +120,8 @@ class Sampler(nn.Module):
         )
         return sampler_output
 
+    @staticmethod
     def apply_temperature(
-        self,
         logits: torch.Tensor,
         temp: torch.Tensor,
         all_random: bool,
@@ -132,7 +132,8 @@ class Sampler(nn.Module):
             temp = torch.where(temp < _SAMPLING_EPS, 1.0, temp)
         return logits.div_(temp.unsqueeze(dim=1))
 
-    def greedy_sample(self, logits: torch.Tensor) -> torch.Tensor:
+    @staticmethod
+    def greedy_sample(logits: torch.Tensor) -> torch.Tensor:
         return logits.argmax(dim=-1).view(-1)
 
     def sample(
@@ -191,11 +192,12 @@ class Sampler(nn.Module):
         )
         return sampled, processed_logprobs
 
-    def compute_logprobs(self, logits: torch.Tensor) -> torch.Tensor:
+    @staticmethod
+    def compute_logprobs(logits: torch.Tensor) -> torch.Tensor:
         return logits.log_softmax(dim=-1, dtype=torch.float32)
 
+    @staticmethod
     def gather_logprobs(
-        self,
         logprobs: torch.Tensor,
         num_logprobs: int,
         token_ids: torch.Tensor,
@@ -238,8 +240,8 @@ class Sampler(nn.Module):
 
         return LogprobsTensors(indices, logprobs, token_ranks)
 
+    @staticmethod
     def _combine_outputs_with_spec_tokens(
-        self,
         output_token_ids: list[list[int]],
         spec_token_ids: Optional[list[list[int]]] = None,
     ) -> list[list[int]]:
@@ -257,8 +259,9 @@ class Sampler(nn.Module):
         sampling_metadata: SamplingMetadata,
         predict_bonus_token: bool,
     ) -> torch.Tensor:
+        bad_words_token_ids = sampling_metadata.bad_words_token_ids
         any_penalties_or_bad_words = (
-            sampling_metadata.bad_words_token_ids or not sampling_metadata.no_penalties
+            bool(bad_words_token_ids) or not sampling_metadata.no_penalties
         )
 
         output_token_ids = sampling_metadata.output_token_ids
@@ -266,7 +269,7 @@ class Sampler(nn.Module):
             # Combine base outputs with spec tokens when speculative decoding
             # is enabled.
             output_token_ids = self._combine_outputs_with_spec_tokens(
-                sampling_metadata.output_token_ids,
+                output_token_ids,
                 sampling_metadata.spec_token_ids,
             )
 
@@ -275,14 +278,8 @@ class Sampler(nn.Module):
             logits.masked_fill_(sampling_metadata.allowed_token_ids_mask, float("-inf"))
 
         # Apply bad words exclusion.
-        if sampling_metadata.bad_words_token_ids:
-            apply_bad_words(
-                logits,
-                sampling_metadata.bad_words_token_ids,
-                output_token_ids
-                if output_token_ids is not None
-                else sampling_metadata.output_token_ids,
-            )
+        if bad_words_token_ids:
+            apply_bad_words(logits, bad_words_token_ids, output_token_ids)
 
         # Apply logits processors which can impact greedy sampling.
         for processor in sampling_metadata.logitsprocs.non_argmax_invariant:
@@ -292,22 +289,21 @@ class Sampler(nn.Module):
         logits = self.apply_penalties(logits, sampling_metadata, output_token_ids)
         return logits
 
+    @staticmethod
     def apply_penalties(
-        self,
         logits: torch.Tensor,
         sampling_metadata: SamplingMetadata,
-        output_token_ids: Optional[list[list[int]]] = None,
+        output_token_ids: list[list[int]],
     ) -> torch.Tensor:
-        if not sampling_metadata.no_penalties:
+        if sampling_metadata.no_penalties:
+            return logits
+
         assert sampling_metadata.prompt_token_ids is not None
-            logits = apply_all_penalties(
+        return apply_all_penalties(
             logits,
             sampling_metadata.prompt_token_ids,
             sampling_metadata.presence_penalties,
             sampling_metadata.frequency_penalties,
             sampling_metadata.repetition_penalties,
-                output_token_ids
-                if output_token_ids is not None
-                else sampling_metadata.output_token_ids,
+            output_token_ids,
         )
-        return logits

vllm/v1/worker/gpu_input_batch.py

@@ -62,9 +62,8 @@ class CachedRequestState:
                     "provided via prompt_embeds, and its ID is unknown."
                 )
             return self.prompt_token_ids[idx]
-        elif idx - self.num_prompt_tokens < len(self.output_token_ids):
+        if idx - self.num_prompt_tokens < len(self.output_token_ids):
             return self.output_token_ids[idx - self.num_prompt_tokens]
-        else:
         return -1
 
 
@@ -770,14 +769,13 @@ class InputBatch:
             not self.no_penalties
             or self.logits_processing_needs_token_ids[:num_reqs].any()
         )
-        if needs_prompt_token_ids:
         # The prompt tokens are used only for applying penalties or
         # step pooling during the sampling/pooling process.
         # Hence copy these tensors only when there are requests which
         # need penalties/step_pooler to be applied.
-            prompt_token_ids = self._make_prompt_token_ids_tensor()
-        else:
-            prompt_token_ids = None
+        prompt_token_ids = (
+            self._make_prompt_token_ids_tensor() if needs_prompt_token_ids else None
+        )
 
         allowed_token_ids_mask: Optional[torch.Tensor] = None
         if not self.no_allowed_token_ids:

vllm/v1/worker/gpu_model_runner.py

@@ -1996,7 +1996,8 @@ class GPUModelRunner(LoRAModelRunnerMixin, KVConnectorModelRunnerMixin):
     # Should be called after attention metadata creation. This just pads
     # the second ubatch slice out to the total number of tokens
     # (num_tokens + padding)
-    def pad_out_ubatch_slice(self, ubatch_slices: UBatchSlices, num_total_tokens: int):
+    @staticmethod
+    def pad_out_ubatch_slice(ubatch_slices: UBatchSlices, num_total_tokens: int):
         padded_second_ubatch_slice = slice(
             ubatch_slices[1].token_slice.start, num_total_tokens
         )
@@ -2085,12 +2086,13 @@ class GPUModelRunner(LoRAModelRunnerMixin, KVConnectorModelRunnerMixin):
         dict[str, Any],
     ]:
         num_scheduled_tokens = scheduler_output.total_num_scheduled_tokens
+        is_first_rank = get_pp_group().is_first_rank
 
         # _prepare_inputs may reorder the batch, so we must gather multi
         # modal outputs after that to ensure the correct order
         if (
             self.supports_mm_inputs
-            and get_pp_group().is_first_rank
+            and is_first_rank
             and not self.model_config.is_encoder_decoder
         ):
             # Run the multimodal encoder if any.
@@ -2115,7 +2117,7 @@ class GPUModelRunner(LoRAModelRunnerMixin, KVConnectorModelRunnerMixin):
                 **self._init_model_kwargs(num_scheduled_tokens),
                 **self._extract_mm_kwargs(scheduler_output),
             }
-        elif self.enable_prompt_embeds and get_pp_group().is_first_rank:
+        elif self.enable_prompt_embeds and is_first_rank:
             # Get the input embeddings for the tokens that are not input embeds,
             # then put them into the appropriate positions.
             # TODO(qthequartermasterman): Since even when prompt embeds are
@@ -2155,7 +2157,7 @@ class GPUModelRunner(LoRAModelRunnerMixin, KVConnectorModelRunnerMixin):
         else:
             positions = self.positions.gpu[:num_input_tokens]
 
-        if get_pp_group().is_first_rank:
+        if is_first_rank:
             intermediate_tensors = None
         else:
             intermediate_tensors = self.sync_and_slice_intermediate_tensors(
@@ -2186,11 +2188,11 @@ class GPUModelRunner(LoRAModelRunnerMixin, KVConnectorModelRunnerMixin):
         # Sample the next token and get logprobs if needed.
         sampling_metadata = self.input_batch.sampling_metadata
         if spec_decode_metadata is None:
-            sampler_output = self.sampler(
+            return self.sampler(
                 logits=logits,
                 sampling_metadata=sampling_metadata,
             )
-        else:
+
         # When indexing with a tensor (bonus_logits_indices), PyTorch
         # creates a new tensor with separate storage from the original
         # logits tensor. This means any in-place operations on bonus_logits
@@ -2217,7 +2219,6 @@ class GPUModelRunner(LoRAModelRunnerMixin, KVConnectorModelRunnerMixin):
         )
         sampler_output.sampled_token_ids = output_token_ids
         self._update_states_after_model_execute(output_token_ids)
-
         return sampler_output
 
     def _bookkeeping_sync(
@@ -3741,7 +3742,7 @@ class GPUModelRunner(LoRAModelRunnerMixin, KVConnectorModelRunnerMixin):
                 decode_cudagraph_batch_sizes = [
                     x
                     for x in self.cudagraph_batch_sizes
-                    if x <= max_num_tokens and x >= self.uniform_decode_query_len
+                    if max_num_tokens >= x >= self.uniform_decode_query_len
                 ]
                 compilation_cases_decode = list(reversed(decode_cudagraph_batch_sizes))
                 self._capture_cudagraphs(