Remove the synchronization introduced by the verification logic when mtp is enabled.

vllm/zero_overhead/v1/eagle.py

+
+import torch
+from vllm.forward_context import set_forward_context
+from vllm.model_executor.models.llama_eagle3 import Eagle3LlamaForCausalLM
+from vllm.v1.attention.backends.flash_attn import FlashAttentionMetadata
+from vllm.v1.attention.backends.mla.common import MLACommonMetadata
+from vllm.v1.attention.backends.utils import CommonAttentionMetadata
+from vllm.v1.sample.metadata import SamplingMetadata
+from vllm.v1.spec_decode.eagle import PADDING_SLOT_ID, EagleProposer
+
+
+class V1ZeroEagleProposer(EagleProposer):
+    def __init__(self, vllm_config, device, runner=None):
+        super().__init__(vllm_config, device, runner)
+        self.spec_scheduler_max_num_tokens = 0
+
+
+    def propose(
+        self,
+        # [num_tokens]
+        target_token_ids: torch.Tensor,
+        # [num_tokens]
+        target_positions: torch.Tensor,
+        # [num_tokens, hidden_size]
+        target_hidden_states: torch.Tensor,
+        # [num_tokens]
+        target_slot_mapping: torch.Tensor,
+        # [batch_size]
+        next_token_ids: torch.Tensor,
+        # [batch_size + 1] starting with 0
+        cu_num_tokens: torch.Tensor,
+        # [batch_size, max_num_blocks_per_req]
+        block_table: torch.Tensor,
+        # [batch_size]
+        sampling_metadata: SamplingMetadata,
+        decoding: bool = False,
+    ) -> torch.Tensor:
+        num_tokens = target_token_ids.shape[0]
+        batch_size = next_token_ids.shape[0]
+        last_token_indices = cu_num_tokens[1:] - 1
+
+        if self.method == "eagle3":
+            assert isinstance(self.model, Eagle3LlamaForCausalLM)
+            target_hidden_states = self.model.combine_hidden_states(
+                target_hidden_states)
+            assert target_hidden_states.shape[-1] == self.hidden_size
+
+        # Shift the input ids by one token.
+        # E.g., [a1, b1, b2, c1, c2, c3] -> [b1, b2, c1, c2, c3, c3]
+        self.input_ids[:num_tokens - 1] = target_token_ids[1:]
+        # Replace the last token with the next token.
+        # E.g., [b1, b2, c1, c2, c3, c3] -> [a2, b2, b3, c2, c3, c4]
+        self.input_ids[last_token_indices] = next_token_ids
+
+        # FA requires seq_len to have dtype int32.
+        seq_lens = (target_positions[last_token_indices] + 1).int()
+
+        if self.method in ["eagle", "eagle3"]:
+            # FIXME(woosuk): The below two ops cause synchronization. Optimize.
+            max_seq_len = seq_lens.max().item()
+            max_num_tokens = (cu_num_tokens[1:] -
+                              cu_num_tokens[:-1]).max().item()
+            attn_metadata = FlashAttentionMetadata(
+                num_actual_tokens=num_tokens,
+                max_query_len=max_num_tokens,
+                query_start_loc=cu_num_tokens,
+                max_seq_len=max_seq_len,
+                seq_lens=seq_lens,
+                block_table=block_table,
+                slot_mapping=target_slot_mapping,
+                # TODO(woosuk): Support cascade attention.
+                use_cascade=False,
+                common_prefix_len=0,
+                cu_prefix_query_lens=None,
+                prefix_kv_lens=None,
+                suffix_kv_lens=None,
+            )
+        elif self.method == "deepseek_mtp":
+            max_query_len = self.spec_scheduler_max_num_tokens
+            common_attn_metadata = CommonAttentionMetadata(
+                query_start_loc=cu_num_tokens,
+                seq_lens=seq_lens,
+                num_reqs=batch_size,
+                num_actual_tokens=num_tokens,
+                max_query_len=max_query_len,
+                slot_mapping=target_slot_mapping,
+                spec_layer_decoding=decoding
+            )
+
+            assert self.runner is not None
+
+            # FIXME: need to consider multiple kv_cache_groups
+            attn_metadata = self.runner.attn_metadata_builders[0].build(
+                common_prefix_len=0,
+                common_attn_metadata=common_attn_metadata
+            )
+        else:
+            raise ValueError(f"Unsupported method: {self.method}")
+
+        # At this moment, we assume all eagle layers belong to the same KV
+        # cache group, thus using the same attention metadata.
+        per_layer_attn_metadata = {}
+        for layer_name in self.attn_layer_names:
+            per_layer_attn_metadata[layer_name] = attn_metadata
+        if self.use_cuda_graph and \
+            num_tokens <= self.cudagraph_batch_sizes[-1]:
+            num_input_tokens = self.vllm_config.pad_for_cudagraph(num_tokens)
+        else:
+            num_input_tokens = num_tokens
+        # copy inputs to buffer for cudagraph
+        self.positions[:num_tokens] = target_positions
+        self.hidden_states[:num_tokens] = target_hidden_states
+
+        if (decoding and self.use_full_cuda_graph
+                and num_tokens <= self.cudagraph_batch_sizes[-1]):
+            assert self.attn_metadata_cudagraph
+            if self.method in ["eagle", "eagle3"]:
+                self.attn_metadata_cudagraph.seq_lens[:batch_size] = (
+                    attn_metadata.seq_lens)
+                self.attn_metadata_cudagraph.slot_mapping[:num_tokens] = (
+                    attn_metadata.slot_mapping)
+                self.attn_metadata_cudagraph.query_start_loc[:batch_size + 1] = (
+                    attn_metadata.query_start_loc)
+                self.attn_metadata_cudagraph.block_table[:batch_size] = (
+                    attn_metadata.block_table)
+            elif self.method == "deepseek_mtp":
+                self.attn_metadata_cudagraph.num_actual_tokens = (
+                    attn_metadata.num_actual_tokens)
+                self.attn_metadata_cudagraph.query_start_loc[:batch_size + 1] = (
+                    attn_metadata.query_start_loc)
+                self.attn_metadata_cudagraph.slot_mapping[:num_tokens] = (
+                    attn_metadata.slot_mapping)
+                self.attn_metadata_cudagraph.num_decodes = (
+                    attn_metadata.num_decodes)
+                self.attn_metadata_cudagraph.num_decode_tokens = (
+                    attn_metadata.num_decode_tokens)
+                self.attn_metadata_cudagraph.num_prefills = (
+                    attn_metadata.num_prefills)
+
+                if attn_metadata.decode is not None:
+                    self.attn_metadata_cudagraph.decode.block_table[:attn_metadata.num_decode_tokens] = (
+                            attn_metadata.decode.block_table)
+                    self.attn_metadata_cudagraph.decode.seq_lens[:attn_metadata.num_decode_tokens] = (
+                        attn_metadata.decode.seq_lens)
+
+        with set_forward_context(per_layer_attn_metadata,
+                                 self.vllm_config,
+                                 num_tokens=num_input_tokens,
+                                 skip_cuda_graphs=not decoding):
+            ret_hidden_states = self.model(
+                self.input_ids[:num_input_tokens],
+                self.positions[:num_input_tokens],
+                self.hidden_states[:num_input_tokens],
+            )
+            if self.method == "deepseek_mtp":
+                last_hidden_states = ret_hidden_states
+            else:
+                last_hidden_states, hidden_states = ret_hidden_states
+        sample_hidden_states = last_hidden_states[last_token_indices]
+        logits = self.model.compute_logits(sample_hidden_states, None)
+
+        draft_token_ids = logits.argmax(dim=-1)
+
+        # Early exit if there is only one draft token to be generated.
+        if self.num_speculative_tokens == 1:
+            # [batch_size, 1]
+            return draft_token_ids.view(-1, 1)
+
+        # TODO: Currently, MTP module released by deepseek only has
+        # one layer. Adapt this code to support multiple layers once
+        # there's a multi-layer MTP module.
+
+        # Generate the remaining draft tokens.
+        draft_token_ids_list = [draft_token_ids]
+
+        positions = target_positions[last_token_indices]
+
+        if self.method == "deepseek_mtp":
+            hidden_states = last_hidden_states[last_token_indices]
+        else:
+            hidden_states = hidden_states[last_token_indices]
+
+        if self.use_cuda_graph and \
+                batch_size <= self.cudagraph_batch_sizes[-1]:
+            input_batch_size = self.vllm_config.pad_for_cudagraph(batch_size)
+        else:
+            input_batch_size = batch_size
+        attn_metadata.num_actual_tokens = batch_size
+        attn_metadata.max_query_len = 1
+        attn_metadata.query_start_loc = self.arange[:batch_size + 1]
+
+        if isinstance(attn_metadata, MLACommonMetadata):
+            attn_metadata.num_decodes = batch_size
+            attn_metadata.num_decode_tokens = batch_size
+            attn_metadata.num_prefills = 0
+            block_table = self.runner.attn_metadata_builders[0].block_table.get_device_tensor()[:batch_size, ...]
+            attn_metadata.decode = self.runner.attn_metadata_builders[0]._build_decode(
+                block_table_tensor=block_table,
+                seq_lens=seq_lens,
+            )
+
+        for i in range(self.num_speculative_tokens - 1):
+            # Update the inputs.
+            # cast to int32 is crucial when eagle model is compiled.
+            # tensor.argmax() returns int64 by default.
+            input_ids = draft_token_ids_list[-1].int()
+            positions += 1
+
+            # NOTE(woosuk): We should handle the case where the draft model
+            # generates tokens beyond the max model length. Since it is complex
+            # to remove such requests from the batch, we keep them in the batch
+            # but adjust the position ids and slot mappings to avoid the
+            # out-of-range access during the model execution. The draft tokens
+            # generated with this adjustment should be ignored.
+            exceeds_max_model_len = positions >= self.max_model_len
+            # Mask out the position ids that exceed the max model length.
+            # Otherwise, we may get out-of-range error in RoPE.
+            clamped_positions = torch.where(exceeds_max_model_len, 0,
+                                            positions)
+
+            if isinstance(attn_metadata, MLACommonMetadata):
+                attn_metadata.decode.seq_lens += 1
+            else:
+                attn_metadata.seq_lens += 1
+
+                # Increment the sequence lengths.
+                attn_metadata.max_seq_len += 1
+                # Consider max model length.
+                attn_metadata.max_seq_len = min(attn_metadata.max_seq_len,
+                                                self.max_model_len)
+
+                # For the requests that exceed the max model length, we set the
+                # sequence length to 1 to minimize their overheads in attention.
+                attn_metadata.seq_lens.masked_fill_(exceeds_max_model_len, 1)
+
+            # Compute the slot mapping.
+            block_numbers = clamped_positions // self.block_size
+            block_ids = block_table.gather(dim=1,
+                                        index=block_numbers.view(-1, 1))
+            block_ids = block_ids.view(-1)
+            attn_metadata.slot_mapping = (block_ids * self.block_size +
+                                        clamped_positions % self.block_size)
+            # Mask out the slot mappings that exceed the max model length.
+            # Otherwise, the KV cache will be inadvertently updated with the
+            # padding tokens.
+            attn_metadata.slot_mapping.masked_fill_(exceeds_max_model_len,
+                                                    PADDING_SLOT_ID)
+
+            # copy inputs to buffer for cudagraph
+            self.input_ids[:batch_size] = input_ids
+            self.positions[:batch_size] = clamped_positions
+            self.hidden_states[:batch_size] = hidden_states
+
+            if (self.use_full_cuda_graph
+                    and batch_size <= self.cudagraph_batch_sizes[-1]):
+                assert self.attn_metadata_cudagraph
+                if self.method in ["eagle", "eagle3"]:
+                    self.attn_metadata_cudagraph.seq_lens[:batch_size] = (
+                        attn_metadata.seq_lens)
+                    self.attn_metadata_cudagraph.slot_mapping[:batch_size] = (
+                        attn_metadata.slot_mapping)
+                    if i == 0:
+                        self.attn_metadata_cudagraph.query_start_loc[:batch_size +
+                                                                    1] = (
+                                                                        attn_metadata
+                                                                        .
+                                                                        query_start_loc
+                                                                    )
+                        self.attn_metadata_cudagraph.block_table[:batch_size] = (
+                            attn_metadata.block_table)
+                elif self.method == "deepseek_mtp":
+                    self.attn_metadata_cudagraph.num_actual_tokens = (
+                        attn_metadata.num_actual_tokens)
+                    self.attn_metadata_cudagraph.slot_mapping[:attn_metadata.num_decode_tokens] = (
+                        attn_metadata.slot_mapping)
+                    self.attn_metadata_cudagraph.num_decodes = (
+                        attn_metadata.num_decodes)
+                    self.attn_metadata_cudagraph.num_decode_tokens = (
+                        attn_metadata.num_decode_tokens)
+                    self.attn_metadata_cudagraph.num_prefills = (
+                        attn_metadata.num_prefills)
+                    self.attn_metadata_cudagraph.decode.seq_lens[:attn_metadata.num_decode_tokens] = (
+                        attn_metadata.decode.seq_lens)
+
+                    if i == 0:
+                        self.attn_metadata_cudagraph.query_start_loc[:batch_size + 1] = (
+                            attn_metadata.query_start_loc)
+                        self.attn_metadata_cudagraph.decode.block_table[:attn_metadata.num_decode_tokens] = (
+                            attn_metadata.decode.block_table)
+
+            # Run the model.
+            with set_forward_context(per_layer_attn_metadata,
+                                     self.vllm_config,
+                                     num_tokens=input_batch_size):
+                ret_hidden_states = self.model(
+                    self.input_ids[:input_batch_size],
+                    self.positions[:input_batch_size],
+                    self.hidden_states[:input_batch_size],
+                )
+                if self.method == "deepseek_mtp":
+                    last_hidden_states = ret_hidden_states
+                    hidden_states = last_hidden_states[:batch_size]
+                else:
+                    last_hidden_states, hidden_states = ret_hidden_states
+                    hidden_states = hidden_states[:batch_size]
+
+            logits = self.model.compute_logits(last_hidden_states[:batch_size],
+                                               None)
+
+            # TODO(wenlong): get more than one token for tree attention
+            draft_token_ids = logits.argmax(dim=-1)
+            draft_token_ids_list.append(draft_token_ids)
+
+        # [batch_size, num_speculative_tokens]
+        draft_token_ids = torch.stack(draft_token_ids_list, dim=1)
+
+        return draft_token_ids

vllm/zero_overhead/v1/gpu_model_runner.py

@@ -18,6 +18,7 @@ from vllm.v1.spec_decode.metadata import SpecDecodeMetadata
 from vllm.v1.spec_decode.ngram_proposer import NgramProposer
 from vllm.v1.worker.block_table import BlockTable
 from vllm.v1.worker.gpu_model_runner import GPUModelRunner
+from vllm.zero_overhead.v1.eagle import V1ZeroEagleProposer
 from vllm.zero_overhead.v1.outputs import ZeroV1ModelRunnerOutput
 from vllm.profiler.prof import profile
 from vllm.two_batch_overlap.v1.model_input_split_v1 import tbo_split_and_execute_model
@@ -31,10 +32,14 @@ class V1ZeroModelRunner(GPUModelRunner):
         self.last_sampled_token_lens = []
         self.last_sampler_event = torch.cuda.Event(enable_timing=False)
         self.last_sampler_host_tokens = None
-        self.token_ids_cpu_fix_recode = []
+        self.token_ids_cpu_fix_record = []
         self.last_draft_token_ids = None
         self.last_draft_host_tokens = None
         self.last_draft_event = torch.cuda.Event(enable_timing=False)
+        self.spec_sampler_event = torch.cuda.Event(enable_timing=False)
+        self.spec_scheduler_max_num_tokens = 0
+        self.drafter = V1ZeroEagleProposer(self.vllm_config, self.device,
+                                             self) 
     
     def _prepare_inputs(
         self,
@@ -62,6 +67,7 @@ class V1ZeroModelRunner(GPUModelRunner):
         tokens = [scheduler_output.num_scheduled_tokens[i] for i in req_ids]
         num_scheduled_tokens = np.array(tokens, dtype=np.int32)
         max_num_scheduled_tokens = max(tokens)
+        self.spec_scheduler_max_num_tokens = max_num_scheduled_tokens
 
         # Get request indices.
         # E.g., [2, 5, 3] -> [0, 0, 1, 1, 1, 1, 1, 2, 2, 2]
@@ -281,7 +287,8 @@ class V1ZeroModelRunner(GPUModelRunner):
     def propose_draft_token_ids(
         self,
         scheduler_output: "SchedulerOutput",
-        sampled_token_ids: list[list[int]],
+        num_accepted_tokens_tensor: torch.Tensor,
+        sampled_token_ids: torch.Tensor,
         sampling_metadata: SamplingMetadata,
         hidden_states: torch.Tensor,
         sample_hidden_states: torch.Tensor,
@@ -317,26 +324,8 @@ class V1ZeroModelRunner(GPUModelRunner):
         elif self.speculative_config.use_eagle():
             assert isinstance(self.drafter, EagleProposer)
             # TODO(woosuk): Refactor the loop.
-            if self.last_sampled_token_ids is not None:
-                next_token_ids = self.last_sampled_token_ids.flatten()
-            else:
-                next_token_ids: list[int] = []
-                for i, token_ids in enumerate(sampled_token_ids):
-                    if token_ids:
-                        # Common case.
-                        next_token_id = token_ids[-1]
-                    else:
-                        # Partial prefill (rare case).
-                        # Get the next token id from the request state.
-                        req_id = self.input_batch.req_ids[i]
-                        req_state = self.requests[req_id]
-                        seq_len = (req_state.num_computed_tokens +
-                                scheduler_output.num_scheduled_tokens[req_id])
-                        next_token_id = req_state.get_token_id(seq_len)
-                    next_token_ids.append(next_token_id)
-                next_token_ids = torch.tensor(next_token_ids,
-                                            dtype=torch.int32,
-                                            device=self.device)
+            row_indices = torch.arange(sampled_token_ids.size(0), device=sampled_token_ids.device)
+            next_token_ids = sampled_token_ids[row_indices, num_accepted_tokens_tensor].flatten()
             # At this moment, we assume all eagle layers belong to the same KV
             # cache group, thus using the same attention metadata.
             eagle_attn_metadata = attn_metadata[
@@ -348,6 +337,7 @@ class V1ZeroModelRunner(GPUModelRunner):
             else:
                 block_table = None
 
+            spec_scheduler_max_num_tokens = self.spec_scheduler_max_num_tokens
             if spec_decode_metadata is None:
                 # input_ids can be None for multimodal models.
                 target_token_ids = self.input_ids[:num_scheduled_tokens]
@@ -363,16 +353,11 @@ class V1ZeroModelRunner(GPUModelRunner):
                 cu_num_tokens = eagle_attn_metadata.query_start_loc
             else:
                 # TODO(woosuk): Refactor this.
-                num_accepted_tokens = [len(s) - 1 for s in sampled_token_ids]
-                num_accepted_tokens_tensor = async_tensor_h2d(
-                    num_accepted_tokens,
-                    dtype=torch.int32,
-                    target_device=self.device,
-                    pin_memory=True)
                 cu_num_tokens, token_indices = self.drafter.prepare_inputs(
                     eagle_attn_metadata.query_start_loc,
                     num_accepted_tokens_tensor,
                 )
+                spec_scheduler_max_num_tokens = 1
                 target_token_ids = self.input_ids[token_indices]
                 # TODO(woosuk): Support M-RoPE.
                 target_positions = self.positions[token_indices]
@@ -383,6 +368,7 @@ class V1ZeroModelRunner(GPUModelRunner):
                     target_hidden_states = hidden_states[token_indices]
                 target_slot_mapping = eagle_attn_metadata.slot_mapping[
                     token_indices]
+            self.drafter.spec_scheduler_max_num_tokens = spec_scheduler_max_num_tokens
             draft_token_ids = self.drafter.propose(
                 target_token_ids=target_token_ids,
                 target_positions=target_positions,
@@ -392,7 +378,7 @@ class V1ZeroModelRunner(GPUModelRunner):
                 cu_num_tokens=cu_num_tokens,
                 block_table=block_table,
                 sampling_metadata=sampling_metadata,
-                decoding=spec_decode_metadata is not None
+                decoding=spec_decode_metadata is not None,
             )
             spec_token_ids = np.ones(draft_token_ids.shape, dtype=int).tolist()
             self.last_draft_token_ids = draft_token_ids
@@ -622,22 +608,49 @@ class V1ZeroModelRunner(GPUModelRunner):
             scheduler_output,
         )
 
-        # Get the valid generated tokens.
-        sampled_token_ids = sampler_output.sampled_token_ids
-        max_gen_len = sampled_token_ids.shape[-1]
-
         fix_req_ids = None
         fix_sampled_token_ids = None
         fix_draft_token_ids = None
         fix_draft_req_ids = self.last_sampled_req_ids
         is_output_valid = False
+        # Get the valid generated tokens.
+        sampled_token_ids = sampler_output.sampled_token_ids
+        max_gen_len = sampled_token_ids.shape[-1]
+        if not self.speculative_config:
+            # Speculative decoding is not enabled.
+            spec_token_ids = None
+            fix_draft_req_ids = None
+        else:
+            sampled_token_ids_cpu = sampled_token_ids.to('cpu', non_blocking=True)
+            self.spec_sampler_event.record()
+            if self.last_draft_host_tokens is not None:
+                self.last_draft_event.synchronize()
+                fix_draft_token_ids = self.last_draft_host_tokens.tolist()
+
+            mask = (sampled_token_ids == -1)
+            mask_int = mask.int()
+            first_neg_one_indices = torch.argmax(mask_int, dim=1)
+            num_accepted_tokens_tensor = torch.where(torch.any(mask, dim=1), first_neg_one_indices, sampled_token_ids.size(1)) - 1
+            spec_token_ids = self.propose_draft_token_ids(
+                scheduler_output,
+                num_accepted_tokens_tensor,
+                sampled_token_ids,
+                sampling_metadata,
+                hidden_states,
+                sample_hidden_states,
+                aux_hidden_states,
+                spec_decode_metadata,
+                attn_metadata,
+            )
+
         if self.speculative_config:
+            self.spec_sampler_event.synchronize()
             if max_gen_len == 1:
-                valid_sampled_token_ids = sampled_token_ids.tolist()
+                valid_sampled_token_ids = sampled_token_ids_cpu.tolist()
             else:
                 # Includes spec decode tokens.
                 valid_sampled_token_ids = self.rejection_sampler.parse_output(
-                    sampled_token_ids,
+                    sampled_token_ids_cpu,
                     self.input_batch.vocab_size,
                 )
                 self.last_sampler_host_tokens = None
@@ -649,13 +662,21 @@ class V1ZeroModelRunner(GPUModelRunner):
             if self.last_sampler_host_tokens != None:
                 self.last_sampler_event.synchronize()
                 fix_sampled_token_ids = self.last_sampler_host_tokens.tolist()
-                for req_idx, start_idx, end_idx in self.token_ids_cpu_fix_recode:
-                    self.input_batch.token_ids_cpu[req_idx, start_idx:end_idx] = fix_sampled_token_ids[req_idx]
+                for req_idx, start_idx, end_idx in self.token_ids_cpu_fix_record:  
+                    if start_idx == -1:
+                        continue                  
+                    req_id = fix_req_ids[req_idx]
+                    if req_id in self.input_batch.req_ids:
+                        new_req_idx = self.input_batch.req_ids.index(req_id)
+                        self.input_batch.token_ids_cpu[new_req_idx, start_idx:end_idx] = fix_sampled_token_ids[req_idx]
             for req_idx, req_id in enumerate(fix_req_ids):
                 if req_id in self.requests:
                     req_state = self.requests[req_id]
                     token_idx = self.last_sampled_token_lens[req_idx]
-                    req_state.output_token_ids[token_idx] = fix_sampled_token_ids[req_idx][0]
+                    if token_idx == -1:
+                        continue
+                    fix_len = len(fix_sampled_token_ids[req_idx])
+                    req_state.output_token_ids[token_idx:token_idx + fix_len] = fix_sampled_token_ids[req_idx]
             self.last_sampler_host_tokens = sampled_token_ids.to('cpu', non_blocking=True)
             self.last_sampler_event.record()
             self.last_sampled_token_ids = sampled_token_ids
@@ -670,11 +691,16 @@ class V1ZeroModelRunner(GPUModelRunner):
         # NOTE(woosuk): As an exception, when using PP, the scheduler sends
         # the sampled tokens back, because there's no direct communication
         # between the first-stage worker and the last-stage worker.
-        self.token_ids_cpu_fix_recode.clear()
+        self.token_ids_cpu_fix_record.clear()
         self.last_sampled_req_ids = []
         self.last_sampled_token_lens = []
         for req_idx, sampled_ids in enumerate(valid_sampled_token_ids):
+            req_id = self.input_batch.req_ids[req_idx]
+            self.last_sampled_req_ids.append(req_id)
+            cache_output_len = -1
             if not sampled_ids:
+                self.last_sampled_token_lens.append(-1)
+                self.token_ids_cpu_fix_record.append([req_idx, -1, -1])
                 continue
 
             start_idx = self.input_batch.num_tokens_no_spec[req_idx]
@@ -686,34 +712,15 @@ class V1ZeroModelRunner(GPUModelRunner):
 
             self.input_batch.token_ids_cpu[req_idx,
                                             start_idx:end_idx] = sampled_ids
-            self.token_ids_cpu_fix_recode.append([req_idx, start_idx, end_idx])
+            self.token_ids_cpu_fix_record.append([req_idx, start_idx, end_idx])
             self.input_batch.num_tokens_no_spec[req_idx] = end_idx
             self.input_batch.num_tokens[req_idx] = end_idx
-            req_id = self.input_batch.req_ids[req_idx]
             if req_id in self.requests:
                 req_state = self.requests[req_id]
-                self.last_sampled_req_ids.append(req_id)
-                self.last_sampled_token_lens.append(len(req_state.output_token_ids))
+                cache_output_len = len(req_state.output_token_ids)
                 req_state.output_token_ids.extend(sampled_ids)
+            self.last_sampled_token_lens.append(cache_output_len)
                 
-        if not self.speculative_config:
-            # Speculative decoding is not enabled.
-            spec_token_ids = None
-            fix_draft_req_ids = None
-        else:
-            if self.last_draft_host_tokens is not None:
-                self.last_draft_event.synchronize()
-                fix_draft_token_ids = self.last_draft_host_tokens.tolist()
-            spec_token_ids = self.propose_draft_token_ids(
-                scheduler_output,
-                valid_sampled_token_ids,
-                sampling_metadata,
-                hidden_states,
-                sample_hidden_states,
-                aux_hidden_states,
-                spec_decode_metadata,
-                attn_metadata,
-            )
 
         # Clear KVConnector state after all KVs are generated.
         if has_kv_transfer_group():