import time from dataclasses import dataclass from typing import TYPE_CHECKING, Dict, List, Optional, Set import numpy as np import torch import torch.distributed import torch.nn as nn from vllm import envs from vllm.compilation.compile_context import set_compile_context from vllm.compilation.config import CompilationConfig from vllm.compilation.levels import CompilationLevel from vllm.config import VllmConfig from vllm.forward_context import set_forward_context from vllm.logger import init_logger from vllm.model_executor.model_loader import get_model from vllm.multimodal import MultiModalDataDict from vllm.plugins import set_compilation_config from vllm.sampling_params import SamplingParams, SamplingType from vllm.utils import (STR_DTYPE_TO_TORCH_DTYPE, DeviceMemoryProfiler, cdiv, is_pin_memory_available) from vllm.v1.attention.backends.flash_attn import (FlashAttentionBackend, FlashAttentionMetadata) from vllm.v1.outputs import ModelRunnerOutput from vllm.v1.sample.metadata import SamplingMetadata if TYPE_CHECKING: from vllm.v1.core.scheduler import SchedulerOutput logger = init_logger(__name__) class GPUModelRunner: def __init__( self, vllm_config: VllmConfig, ): # TODO: use ModelRunnerBase.__init__(self, vllm_config=vllm_config) self.vllm_config = vllm_config self.model_config = vllm_config.model_config self.cache_config = vllm_config.cache_config self.lora_config = vllm_config.lora_config self.load_config = vllm_config.load_config self.parallel_config = vllm_config.parallel_config self.scheduler_config = vllm_config.scheduler_config self.device_config = vllm_config.device_config self.speculative_config = vllm_config.speculative_config self.prompt_adapter_config = vllm_config.prompt_adapter_config self.observability_config = vllm_config.observability_config model_config = self.model_config cache_config = self.cache_config scheduler_config = self.scheduler_config parallel_config = self.parallel_config self.device = self.device_config.device self.pin_memory = is_pin_memory_available() self.dtype = self.model_config.dtype if cache_config.cache_dtype == "auto": self.kv_cache_dtype = self.dtype else: self.kv_cache_dtype = STR_DTYPE_TO_TORCH_DTYPE[ cache_config.cache_dtype] self.sliding_window = model_config.get_sliding_window() self.block_size = cache_config.block_size self.max_model_len = model_config.max_model_len self.max_num_blocks_per_req = cdiv(self.max_model_len, self.block_size) self.max_num_tokens = scheduler_config.max_num_batched_tokens # Model-related. self.num_attn_layers = model_config.get_num_attention_layers( parallel_config) self.num_kv_heads = model_config.get_num_kv_heads(parallel_config) self.head_size = model_config.get_head_size() # Lazy initialization # self.model: nn.Module # Set after load_model self.kv_caches: List[torch.Tensor] = [] # Request states. self.requests: Dict[str, CachedRequestState] = {} # Persistent batch. self.input_batch = InputBatch( max_num_reqs=self.scheduler_config.max_num_seqs, max_model_len=self.max_model_len, max_num_blocks_per_req=self.max_num_blocks_per_req, device=self.device, pin_memory=self.pin_memory, ) self.use_cuda_graph = (envs.VLLM_TORCH_COMPILE_LEVEL == CompilationLevel.PIECEWISE and not self.model_config.enforce_eager) # TODO(woosuk): Provide an option to tune the max cudagraph batch size. self.cudagraph_batch_sizes = [1, 2, 4] + [i for i in range(8, 513, 8)] self.input_ids = torch.zeros(self.max_num_tokens, dtype=torch.int32, device=self.device) self.positions = torch.zeros(self.max_num_tokens, dtype=torch.int64, device=self.device) def _update_states(self, scheduler_output: "SchedulerOutput") -> None: # Remove stopped requests from the cached states. # Keep the states of the pre-empted requests. for req_id in scheduler_output.finished_req_ids: self.requests.pop(req_id, None) # Remove the requests from the persistent batch. stopped_req_ids = set().union( scheduler_output.preempted_req_ids, scheduler_output.finished_req_ids, ) removed_req_indices: List[int] = [] for req_id in stopped_req_ids: req_index = self.input_batch.remove_request(req_id) if req_index is not None: removed_req_indices.append(req_index) # Update the states of the running requests. for req_data in scheduler_output.scheduled_running_reqs: req_id = req_data.req_id req_state = self.requests[req_id] req_index = self.input_batch.req_id_to_index[req_id] # Update the num_computed_tokens. req_state.num_computed_tokens = req_data.num_computed_tokens self.input_batch.num_computed_tokens_cpu[req_index] = ( req_data.num_computed_tokens) # Update the block table. num_new_blocks = len(req_data.new_block_ids) if num_new_blocks == 0: continue start_index = len(req_state.block_ids) end_index = start_index + num_new_blocks req_state.block_ids.extend(req_data.new_block_ids) self.input_batch.block_table_cpu[ req_index, start_index:end_index] = req_data.new_block_ids req_ids_to_add: List[str] = [] # Add new requests to the cached states. for req_data in scheduler_output.scheduled_new_reqs: req_id = req_data.req_id sampling_params = req_data.sampling_params if sampling_params.sampling_type == SamplingType.RANDOM_SEED: generator = torch.Generator(device=self.device) generator.manual_seed(sampling_params.seed) else: generator = None self.requests[req_id] = CachedRequestState( req_id=req_id, prompt_token_ids=req_data.prompt_token_ids, prompt=req_data.prompt, multi_modal_data=req_data.multi_modal_data, sampling_params=sampling_params, generator=generator, block_ids=req_data.block_ids, num_computed_tokens=req_data.num_computed_tokens, output_token_ids=[], ) req_ids_to_add.append(req_id) # Update the cached states of the resumed requests. for req_data in scheduler_output.scheduled_resumed_reqs: req_id = req_data.req_id req_state = self.requests[req_id] req_state.block_ids = req_data.block_ids req_state.num_computed_tokens = req_data.num_computed_tokens req_ids_to_add.append(req_id) # Add the new or resumed requests to the persistent batch. # The smaller empty indices are filled first. removed_req_indices = sorted(removed_req_indices, reverse=True) for req_id in req_ids_to_add: req_state = self.requests[req_id] if removed_req_indices: # Fill the empty index. req_index = removed_req_indices.pop() else: # Append to the end. req_index = None self.input_batch.add_request(req_state, req_index) # Condense the batched states if there are empty indices. if removed_req_indices: self.input_batch.condense(removed_req_indices) def _prepare_inputs(self, scheduler_output: "SchedulerOutput"): total_num_scheduled_tokens = scheduler_output.total_num_scheduled_tokens assert total_num_scheduled_tokens > 0 num_reqs = self.input_batch.num_reqs assert num_reqs > 0 # OPTIMIZATION: Start copying the block table first. # This way, we can overlap the copy with the following CPU operations. self.input_batch.block_table[:num_reqs].copy_( self.input_batch.block_table_cpu_tensor[:num_reqs], non_blocking=True) # Get the number of scheduled tokens for each request. # TODO: The Python loop can be slow. Optimize. num_scheduled_tokens = [] max_num_scheduled_tokens = 0 for req_id in self.input_batch.req_ids[:num_reqs]: num_tokens = scheduler_output.num_scheduled_tokens[req_id] num_scheduled_tokens.append(num_tokens) max_num_scheduled_tokens = max(max_num_scheduled_tokens, num_tokens) num_scheduled_tokens = np.array(num_scheduled_tokens, dtype=np.int32) assert max_num_scheduled_tokens > 0 # Get request indices. # E.g., [2, 5, 3] -> [0, 0, 1, 1, 1, 1, 1, 2, 2, 2] indices = np.arange(num_reqs) req_indices = np.repeat(indices, num_scheduled_tokens) # Get batched arange. # E.g., [2, 5, 3] -> [0, 1, 0, 1, 2, 3, 4, 0, 1, 2] arange_matrix = np.tile(np.arange(max_num_scheduled_tokens), (num_reqs, 1)) mask = arange_matrix < num_scheduled_tokens[:, np.newaxis] arange = arange_matrix[mask] # Get positions. positions = torch.empty((total_num_scheduled_tokens, ), dtype=torch.int32, device="cpu", pin_memory=self.pin_memory) positions_np = positions.numpy() np.add(self.input_batch.num_computed_tokens_cpu[req_indices], arange, out=positions_np) # Get token indices. # E.g., [0, 1, 0, 1, 2, 3, 4, 0, 1, 2] # -> [0, 1, M, M + 1, M + 2, M + 3, M + 4, 2 * M, 2 * M + 1, 2 * M + 2] # where M is the max_model_len. token_indices = positions_np + req_indices * self.max_model_len token_indices = torch.from_numpy(token_indices) input_ids = torch.empty((total_num_scheduled_tokens, ), dtype=torch.int32, device="cpu", pin_memory=self.pin_memory) torch.index_select(torch.from_numpy( self.input_batch.token_ids_cpu).flatten(), 0, token_indices, out=input_ids) # Calculate the slot mapping. block_numbers = self.input_batch.block_table_cpu_tensor.flatten()[ token_indices // self.block_size] block_offsets = token_indices % self.block_size slot_mapping = torch.empty((total_num_scheduled_tokens, ), dtype=torch.int32, device="cpu", pin_memory=self.pin_memory) torch.add(block_numbers * self.block_size, block_offsets, out=slot_mapping) # Prepare the attention metadata. query_start_loc = torch.empty((num_reqs + 1, ), dtype=torch.int32, device="cpu", pin_memory=self.pin_memory) query_start_loc_np = query_start_loc.numpy() query_start_loc_np[0] = 0 np.cumsum(num_scheduled_tokens, out=query_start_loc_np[1:]) seq_lens = (self.input_batch.num_computed_tokens_cpu[:num_reqs] + num_scheduled_tokens) max_seq_len = seq_lens.max() seq_start_loc = torch.empty((num_reqs + 1, ), dtype=torch.int32, device="cpu", pin_memory=self.pin_memory) seq_start_loc_np = seq_start_loc.numpy() seq_start_loc_np[0] = 0 np.cumsum(seq_lens, out=seq_start_loc_np[1:]) self.input_ids[:total_num_scheduled_tokens].copy_(input_ids, non_blocking=True) self.positions[:total_num_scheduled_tokens].copy_(positions, non_blocking=True) query_start_loc = query_start_loc.to(self.device, non_blocking=True) seq_start_loc = seq_start_loc.to(self.device, non_blocking=True) slot_mapping = slot_mapping.to(self.device, non_blocking=True).long() attn_metadata = FlashAttentionMetadata( num_actual_tokens=total_num_scheduled_tokens, max_query_len=max_num_scheduled_tokens, query_start_loc=query_start_loc, max_seq_len=max_seq_len, seq_start_loc=seq_start_loc, block_table=self.input_batch.block_table[:num_reqs], slot_mapping=slot_mapping, ) # NOTE(woosuk): Due to chunked prefills, there can be at most 1 partial # request in the batch. While we should not sample any token from this # partial request, we do so for simplicity. We will ignore the sampled # token from the partial request. # TODO: Support prompt logprobs. logits_indices = query_start_loc[1:] - 1 return attn_metadata, logits_indices def _prepare_sampling( self, scheduler_output: "SchedulerOutput", ) -> SamplingMetadata: skip_copy = True if (scheduler_output.finished_req_ids or scheduler_output.preempted_req_ids): skip_copy = False if (scheduler_output.scheduled_new_reqs or scheduler_output.scheduled_resumed_reqs): skip_copy = False # Create the sampling metadata. sampling_metadata = self.input_batch.make_sampling_metadata(skip_copy) return sampling_metadata @torch.inference_mode() def execute_model( self, scheduler_output: "SchedulerOutput", ) -> ModelRunnerOutput: self._update_states(scheduler_output) attn_metadata, logits_indices = self._prepare_inputs(scheduler_output) num_scheduled_tokens = scheduler_output.total_num_scheduled_tokens if (self.use_cuda_graph and num_scheduled_tokens <= self.cudagraph_batch_sizes[-1]): # Use piecewise CUDA graphs. # Add padding to the batch size. num_input_tokens = self._get_padded_batch_size( num_scheduled_tokens) else: # Eager mode. num_input_tokens = num_scheduled_tokens with set_forward_context(attn_metadata): hidden_states = self.model( input_ids=self.input_ids[:num_input_tokens], positions=self.positions[:num_input_tokens], kv_caches=self.kv_caches, attn_metadata=None, ) hidden_states = hidden_states[:num_scheduled_tokens] hidden_states = hidden_states[logits_indices] logits = self.model.compute_logits(hidden_states, None) # Sample the next token and get logprobs if needed. sampling_metadata = self._prepare_sampling(scheduler_output) sampler_output = self.model.sample( logits=logits, sampling_metadata=sampling_metadata, ) # NOTE: CPU-GPU synchronization happens here. sampled_token_ids = sampler_output.sampled_token_ids.cpu() sampled_token_ids_list = sampled_token_ids.tolist() # TODO(woosuk): The following loop can be slow since it iterates over # the requests one by one. Optimize. num_reqs = self.input_batch.num_reqs for i, req_id in enumerate(self.input_batch.req_ids[:num_reqs]): req_state = self.requests[req_id] seq_len = (req_state.num_computed_tokens + scheduler_output.num_scheduled_tokens[req_id]) assert seq_len <= req_state.num_tokens if seq_len == req_state.num_tokens: # Append the sampled token to the output token ids. token_id = sampled_token_ids_list[i] self.input_batch.token_ids_cpu[i, seq_len] = token_id req_state.output_token_ids.append(token_id) else: # Ignore the sampled token from the partial request. # Rewind the generator state as if the token was not sampled. generator = self.input_batch.generators.get(i) if generator is not None: # This relies on cuda-specific torch-internal impl details generator.set_offset(generator.get_offset() - 4) if sampler_output.logprob_token_ids is None: logprob_token_ids = None else: logprob_token_ids = sampler_output.logprob_token_ids.cpu() if sampler_output.logprobs is None: logprobs = None else: logprobs = sampler_output.logprobs.cpu() model_runner_output = ModelRunnerOutput( req_ids=self.input_batch.req_ids[:num_reqs], req_id_to_index=self.input_batch.req_id_to_index, sampled_token_ids_cpu=sampled_token_ids, logprob_token_ids_cpu=logprob_token_ids, logprobs_cpu=logprobs, ) return model_runner_output def load_model(self) -> None: if self.use_cuda_graph: # FIXME(woosuk): Currently, we do not use inductor to reduce the # compilation time and any potential issues with the inductor. set_compilation_config( CompilationConfig( use_cudagraph=True, non_cudagraph_ops=["vllm.unified_v1_flash_attention"], use_inductor=False, )) logger.info("Starting to load model %s...", self.model_config.model) with DeviceMemoryProfiler() as m: # noqa: SIM117 self.model = get_model(vllm_config=self.vllm_config) self.model_memory_usage = m.consumed_memory logger.info("Loading model weights took %.4f GB", self.model_memory_usage / float(2**30)) def _dummy_run(self, model: nn.Module, num_tokens: int) -> None: # use an empty tensor instead of `None`` to force Dynamo to pass # it by reference, rather by specializing on the value `None`. # the `dtype` argument does not matter, and we use `float32` as # a placeholder (it has wide hardware support). # it is important to create tensors inside the loop, rather than # multiplying the list, to avoid Dynamo from treating them as # tensor aliasing. dummy_kv_caches = [ torch.tensor([], dtype=torch.float32, device=self.device) for _ in range(self.num_attn_layers) ] with set_forward_context(None): # noqa: SIM117 with set_compile_context(self.cudagraph_batch_sizes): # Trigger compilation for general shape. model(self.input_ids, self.positions, dummy_kv_caches, attn_metadata=None) @torch.inference_mode() def profile_run(self) -> None: self._dummy_run(self.model, self.max_num_tokens) torch.cuda.synchronize() @torch.inference_mode() def capture_model(self) -> None: if not self.use_cuda_graph: logger.warning( "Skipping CUDA graph capture. Please set " "VLLM_TORCH_COMPILE_LEVEL=%d to use CUDA graphs.", CompilationLevel.PIECEWISE) return start_time = time.perf_counter() start_free_gpu_memory = torch.cuda.mem_get_info()[0] with set_forward_context(None): # Trigger CUDA graph capture for specific shapes. # Capture the large shapes first so that the smaller shapes # can reuse the memory pool allocated for the large shapes. for num_tokens in reversed(self.cudagraph_batch_sizes): self.model( self.input_ids[:num_tokens], self.positions[:num_tokens], kv_caches=self.kv_caches, attn_metadata=None, ) end_time = time.perf_counter() end_free_gpu_memory = torch.cuda.mem_get_info()[0] elapsed_time = end_time - start_time cuda_graph_size = start_free_gpu_memory - end_free_gpu_memory # This usually takes 5~20 seconds. logger.info("Graph capturing finished in %.0f secs, took %.2f GiB", elapsed_time, cuda_graph_size / (1 << 30)) def initialize_kv_cache(self, num_blocks: int) -> None: assert len(self.kv_caches) == 0 kv_cache_shape = FlashAttentionBackend.get_kv_cache_shape( num_blocks, self.block_size, self.num_kv_heads, self.head_size) for _ in range(self.num_attn_layers): self.kv_caches.append( torch.zeros(kv_cache_shape, dtype=self.kv_cache_dtype, device=self.device)) def _get_padded_batch_size(self, batch_size: int) -> Optional[int]: # TODO: Optimize this? for size in self.cudagraph_batch_sizes: if batch_size <= size: return size return None @dataclass class CachedRequestState: req_id: str prompt_token_ids: List[int] prompt: Optional[str] multi_modal_data: Optional["MultiModalDataDict"] sampling_params: SamplingParams generator: Optional[torch.Generator] block_ids: List[int] num_computed_tokens: int output_token_ids: List[int] @property def num_tokens(self) -> int: return len(self.prompt_token_ids) + len(self.output_token_ids) class InputBatch: def __init__( self, max_num_reqs: int, max_model_len: int, max_num_blocks_per_req: int, device: torch.device, pin_memory: bool, ): self.max_num_reqs = max_num_reqs self.max_model_len = max_model_len self.max_num_blocks_per_req = max_num_blocks_per_req self.device = device self.pin_memory = pin_memory self.req_ids: List[Optional[str]] = [None] * max_num_reqs self.req_id_to_index: Dict[str, int] = {} self.token_ids_cpu = np.empty((max_num_reqs, max_model_len), dtype=np.int32) self.num_computed_tokens_cpu = np.empty(max_num_reqs, dtype=np.int32) # Attention-related. self.block_table = torch.zeros((max_num_reqs, max_num_blocks_per_req), device=self.device, dtype=torch.int32) self.block_table_cpu_tensor = torch.zeros( (max_num_reqs, max_num_blocks_per_req), device="cpu", dtype=torch.int32, pin_memory=pin_memory, ) self.block_table_cpu = self.block_table_cpu_tensor.numpy() # Sampling-related. self.temperature = torch.empty((max_num_reqs, ), dtype=torch.float32, device=device) self.temperature_cpu_tensor = torch.empty((max_num_reqs, ), dtype=torch.float32, device="cpu", pin_memory=pin_memory) self.temperature_cpu = self.temperature_cpu_tensor.numpy() self.greedy_reqs: Set[str] = set() self.random_reqs: Set[str] = set() self.top_p = torch.empty((max_num_reqs, ), dtype=torch.float32, device=device) self.top_p_cpu_tensor = torch.empty((max_num_reqs, ), dtype=torch.float32, device="cpu", pin_memory=pin_memory) self.top_p_cpu = self.top_p_cpu_tensor.numpy() self.top_p_reqs: Set[str] = set() self.top_k = torch.empty((max_num_reqs, ), dtype=torch.int32, device=device) self.top_k_cpu_tensor = torch.empty((max_num_reqs, ), dtype=torch.int32, device="cpu", pin_memory=pin_memory) self.top_k_cpu = self.top_k_cpu_tensor.numpy() self.top_k_reqs: Set[str] = set() # req_index -> generator self.generators: Dict[int, torch.Generator] = {} self.num_logprobs: Dict[str, int] = {} self.prompt_logprob_reqs: Set[str] = set() def add_request( self, request: "CachedRequestState", req_index: Optional[int] = None, ) -> None: if req_index is None: req_index = self.num_reqs assert req_index < self.max_num_reqs req_id = request.req_id self.req_ids[req_index] = req_id self.req_id_to_index[req_id] = req_index # Copy the prompt token ids and output token ids. num_prompt_tokens = len(request.prompt_token_ids) self.token_ids_cpu[ req_index, :num_prompt_tokens] = request.prompt_token_ids start_idx = num_prompt_tokens end_idx = start_idx + len(request.output_token_ids) self.token_ids_cpu[req_index, start_idx:end_idx] = request.output_token_ids self.num_computed_tokens_cpu[req_index] = request.num_computed_tokens num_blocks = len(request.block_ids) self.block_table_cpu[req_index, :num_blocks] = request.block_ids sampling_params = request.sampling_params self.temperature_cpu[req_index] = sampling_params.temperature if sampling_params.sampling_type == SamplingType.GREEDY: self.greedy_reqs.add(req_id) else: self.random_reqs.add(req_id) self.top_p_cpu[req_index] = sampling_params.top_p if sampling_params.top_p < 1: self.top_p_reqs.add(req_id) self.top_k_cpu[req_index] = sampling_params.top_k if sampling_params.top_k > 0: self.top_k_reqs.add(req_id) self.generators[req_index] = request.generator num_logprobs = sampling_params.logprobs if num_logprobs is not None and num_logprobs > 0: self.num_logprobs[req_id] = num_logprobs if sampling_params.prompt_logprobs: self.prompt_logprob_reqs.add(req_id) def remove_request(self, req_id: str) -> Optional[int]: req_index = self.req_id_to_index.pop(req_id, None) if req_index is None: return None self.req_ids[req_index] = None self.greedy_reqs.discard(req_id) self.random_reqs.discard(req_id) self.top_p_reqs.discard(req_id) self.top_k_reqs.discard(req_id) self.generators.pop(req_index, None) self.num_logprobs.pop(req_id, None) self.prompt_logprob_reqs.discard(req_id) return req_index def clear(self) -> None: self.req_ids = [None] * self.max_num_reqs self.req_id_to_index.clear() self.greedy_reqs.clear() self.random_reqs.clear() self.top_p_reqs.clear() self.top_k_reqs.clear() self.generators.clear() self.num_logprobs.clear() self.prompt_logprob_reqs.clear() def condense(self, empty_req_indices: List[int]) -> None: if self.num_reqs == 0: # The batched states are empty. return # NOTE(woosuk): This function assumes that the empty_req_indices # is sorted in descending order. last_req_index = self.num_reqs + len(empty_req_indices) - 1 while empty_req_indices: # Find the largest non-empty index. while last_req_index in empty_req_indices: last_req_index -= 1 # Find the smallest empty index. empty_index = empty_req_indices.pop() if empty_index >= last_req_index: break # Swap the states. req_id = self.req_ids[last_req_index] self.req_ids[empty_index] = req_id self.req_ids[last_req_index] = None self.req_id_to_index[req_id] = empty_index # TODO(woosuk): Optimize the copy of token_ids_cpu and # block_table_cpu. self.token_ids_cpu[empty_index] = self.token_ids_cpu[ last_req_index] self.num_computed_tokens_cpu[ empty_index] = self.num_computed_tokens_cpu[last_req_index] self.block_table_cpu[empty_index] = self.block_table_cpu[ last_req_index] self.temperature_cpu[empty_index] = self.temperature_cpu[ last_req_index] self.top_p_cpu[empty_index] = self.top_p_cpu[last_req_index] self.top_k_cpu[empty_index] = self.top_k_cpu[last_req_index] generator = self.generators.pop(last_req_index, None) if generator is not None: self.generators[empty_index] = generator # Decrement last_req_index since it is now empty. last_req_index -= 1 def make_sampling_metadata( self, skip_copy: bool = False, ) -> SamplingMetadata: if not skip_copy: self.temperature[:self.num_reqs].copy_( self.temperature_cpu_tensor[:self.num_reqs], non_blocking=True) self.top_p[:self.num_reqs].copy_( self.top_p_cpu_tensor[:self.num_reqs], non_blocking=True) self.top_k[:self.num_reqs].copy_( self.top_k_cpu_tensor[:self.num_reqs], non_blocking=True) return SamplingMetadata( temperature=self.temperature[:self.num_reqs], all_greedy=self.all_greedy, all_random=self.all_random, top_p=self.top_p[:self.num_reqs], top_k=self.top_k[:self.num_reqs], no_top_p=self.no_top_p, no_top_k=self.no_top_k, generators=self.generators, max_num_logprobs=self.max_num_logprobs, ) @property def num_reqs(self) -> int: return len(self.req_id_to_index) @property def all_greedy(self) -> bool: return len(self.random_reqs) == 0 @property def all_random(self) -> bool: return len(self.greedy_reqs) == 0 @property def no_top_p(self) -> bool: return len(self.top_p_reqs) == 0 @property def no_top_k(self) -> bool: return len(self.top_k_reqs) == 0 @property def max_num_logprobs(self) -> int: return max(self.num_logprobs.values()) if self.num_logprobs else 0 @property def no_logprob(self) -> bool: return len(self.num_logprobs) == 0 @property def no_prompt_logprob(self) -> bool: return len(self.prompt_logprob_reqs) == 0