481 lines
17 KiB
Python
481 lines
17 KiB
Python
"""ModelRunner runs the forward passes of the models."""
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import importlib
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import importlib.resources
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import logging
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import pkgutil
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from dataclasses import dataclass
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from functools import lru_cache
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from typing import List, Optional, Type
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import numpy as np
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import torch
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import torch.nn as nn
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from vllm.config import DeviceConfig, LoadConfig
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from vllm.config import ModelConfig as VllmModelConfig
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from vllm.distributed import init_distributed_environment, initialize_model_parallel
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from vllm.model_executor.model_loader import get_model
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from vllm.model_executor.models import ModelRegistry
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from sglang.srt.managers.controller.infer_batch import Batch, ForwardMode
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from sglang.srt.memory_pool import ReqToTokenPool, TokenToKVPool
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from sglang.srt.server_args import ServerArgs
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from sglang.srt.utils import (
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get_available_gpu_memory,
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is_multimodal_model,
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monkey_patch_vllm_p2p_access_check,
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)
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logger = logging.getLogger("srt.model_runner")
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# for server args in model endpoints
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global_server_args_dict = {}
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@dataclass
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class InputMetadata:
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model_runner: "ModelRunner"
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forward_mode: ForwardMode
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batch_size: int
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total_num_tokens: int
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max_seq_len: int
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req_pool_indices: torch.Tensor
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start_loc: torch.Tensor
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seq_lens: torch.Tensor
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prefix_lens: torch.Tensor
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positions: torch.Tensor
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req_to_token_pool: ReqToTokenPool
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token_to_kv_pool: TokenToKVPool
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# for extend
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extend_seq_lens: torch.Tensor = None
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extend_start_loc: torch.Tensor = None
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max_extend_len: int = 0
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out_cache_loc: torch.Tensor = None
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out_cache_cont_start: torch.Tensor = None
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out_cache_cont_end: torch.Tensor = None
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other_kv_index: torch.Tensor = None
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return_logprob: bool = False
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top_logprobs_nums: List[int] = None
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# for flashinfer
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qo_indptr: torch.Tensor = None
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kv_indptr: torch.Tensor = None
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kv_indices: torch.Tensor = None
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kv_last_page_len: torch.Tensor = None
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prefill_wrapper = None
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decode_wrapper = None
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def init_flashinfer_args(self, tp_size):
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from flashinfer import (
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BatchDecodeWithPagedKVCacheWrapper,
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BatchPrefillWithPagedKVCacheWrapper,
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)
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self.kv_indptr = torch.zeros(
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(self.batch_size + 1,), dtype=torch.int32, device="cuda"
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)
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self.kv_indptr[1:] = torch.cumsum(self.seq_lens, dim=0)
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self.kv_last_page_len = torch.ones(
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(self.batch_size,), dtype=torch.int32, device="cuda"
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)
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req_pool_indices_cpu = self.req_pool_indices.cpu().numpy()
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seq_lens_cpu = self.seq_lens.cpu().numpy()
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self.kv_indices = torch.cat(
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[
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self.req_to_token_pool.req_to_token[
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req_pool_indices_cpu[i], : seq_lens_cpu[i]
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]
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for i in range(self.batch_size)
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],
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dim=0,
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).contiguous()
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workspace_buffer = torch.empty(
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32 * 1024 * 1024, dtype=torch.int8, device="cuda"
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)
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if (
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self.forward_mode == ForwardMode.PREFILL
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or self.forward_mode == ForwardMode.EXTEND
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):
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self.qo_indptr = torch.zeros(
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(self.batch_size + 1,), dtype=torch.int32, device="cuda"
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)
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self.qo_indptr[1:] = torch.cumsum(self.extend_seq_lens, dim=0)
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self.prefill_wrapper = BatchPrefillWithPagedKVCacheWrapper(
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workspace_buffer, "NHD"
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)
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args = [
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self.qo_indptr,
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self.kv_indptr,
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self.kv_indices,
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self.kv_last_page_len,
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self.model_runner.model_config.num_attention_heads // tp_size,
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self.model_runner.model_config.num_key_value_heads // tp_size,
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self.model_runner.model_config.head_dim,
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]
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self.prefill_wrapper.begin_forward(*args)
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else:
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self.decode_wrapper = BatchDecodeWithPagedKVCacheWrapper(
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workspace_buffer, "NHD"
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)
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self.decode_wrapper.begin_forward(
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self.kv_indptr,
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self.kv_indices,
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self.kv_last_page_len,
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self.model_runner.model_config.num_attention_heads // tp_size,
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self.model_runner.model_config.num_key_value_heads // tp_size,
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self.model_runner.model_config.head_dim,
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1,
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"NONE",
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"float16",
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)
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def init_extend_args(self):
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self.extend_seq_lens = self.seq_lens - self.prefix_lens
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self.extend_start_loc = torch.zeros_like(self.seq_lens)
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self.extend_start_loc[1:] = torch.cumsum(self.extend_seq_lens[:-1], dim=0)
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self.max_extend_len = int(torch.max(self.extend_seq_lens))
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@classmethod
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def create(
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cls,
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model_runner,
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tp_size,
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forward_mode,
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req_pool_indices,
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seq_lens,
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prefix_lens,
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position_ids_offsets,
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out_cache_loc,
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out_cache_cont_start=None,
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out_cache_cont_end=None,
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top_logprobs_nums=None,
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return_logprob=False,
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):
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batch_size = len(req_pool_indices)
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start_loc = torch.zeros((batch_size,), dtype=torch.int32, device="cuda")
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start_loc[1:] = torch.cumsum(seq_lens[:-1], dim=0)
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total_num_tokens = int(torch.sum(seq_lens))
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max_seq_len = int(torch.max(seq_lens))
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if forward_mode == ForwardMode.DECODE:
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positions = ((seq_lens - 1) + position_ids_offsets).to(torch.int64)
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other_kv_index = model_runner.req_to_token_pool.req_to_token[
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req_pool_indices[0], seq_lens[0] - 1
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].item()
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else:
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seq_lens_cpu = seq_lens.cpu().numpy()
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prefix_lens_cpu = prefix_lens.cpu().numpy()
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position_ids_offsets_cpu = position_ids_offsets.cpu().numpy()
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positions = torch.tensor(
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np.concatenate(
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[
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np.arange(
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prefix_lens_cpu[i] + position_ids_offsets_cpu[i],
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seq_lens_cpu[i] + position_ids_offsets_cpu[i],
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)
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for i in range(batch_size)
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],
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axis=0,
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),
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device="cuda",
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)
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other_kv_index = None
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ret = cls(
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model_runner=model_runner,
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forward_mode=forward_mode,
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batch_size=batch_size,
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total_num_tokens=total_num_tokens,
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max_seq_len=max_seq_len,
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req_pool_indices=req_pool_indices,
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start_loc=start_loc,
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seq_lens=seq_lens,
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prefix_lens=prefix_lens,
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positions=positions,
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req_to_token_pool=model_runner.req_to_token_pool,
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token_to_kv_pool=model_runner.token_to_kv_pool,
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out_cache_loc=out_cache_loc,
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out_cache_cont_start=out_cache_cont_start,
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out_cache_cont_end=out_cache_cont_end,
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other_kv_index=other_kv_index,
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return_logprob=return_logprob,
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top_logprobs_nums=top_logprobs_nums,
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)
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if forward_mode == ForwardMode.EXTEND:
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ret.init_extend_args()
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if global_server_args_dict.get("enable_flashinfer", False):
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ret.init_flashinfer_args(tp_size)
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return ret
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class ModelRunner:
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def __init__(
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self,
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model_config,
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mem_fraction_static: float,
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gpu_id: int,
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tp_rank: int,
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tp_size: int,
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nccl_port: int,
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server_args: ServerArgs,
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):
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self.model_config = model_config
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self.mem_fraction_static = mem_fraction_static
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self.gpu_id = gpu_id
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self.tp_rank = tp_rank
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self.tp_size = tp_size
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self.nccl_port = nccl_port
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self.server_args = server_args
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global global_server_args_dict
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global_server_args_dict = {
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"enable_flashinfer": server_args.enable_flashinfer,
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"attention_reduce_in_fp32": server_args.attention_reduce_in_fp32,
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}
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# Init torch distributed
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logger.info(f"[gpu_id={self.gpu_id}] Set cuda device.")
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torch.cuda.set_device(self.gpu_id)
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logger.info(f"[gpu_id={self.gpu_id}] Init nccl begin.")
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monkey_patch_vllm_p2p_access_check(self.gpu_id)
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init_distributed_environment(
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backend="nccl",
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world_size=self.tp_size,
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rank=self.tp_rank,
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local_rank=self.gpu_id,
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distributed_init_method=f"tcp://127.0.0.1:{self.nccl_port}",
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)
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initialize_model_parallel(tensor_model_parallel_size=self.tp_size)
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total_gpu_memory = get_available_gpu_memory(
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self.gpu_id, distributed=self.tp_size > 1
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)
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if self.tp_size > 1:
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total_local_gpu_memory = get_available_gpu_memory(self.gpu_id)
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if total_local_gpu_memory < total_gpu_memory * 0.9:
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raise ValueError(
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"The memory capacity is unbalanced. Some GPUs may be occupied by other processes."
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)
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self.load_model()
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self.init_memory_pool(total_gpu_memory)
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self.is_multimodal_model = is_multimodal_model(self.model_config)
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def load_model(self):
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logger.info(
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f"[gpu_id={self.gpu_id}] Load weight begin. "
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f"avail mem={get_available_gpu_memory(self.gpu_id):.2f} GB"
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)
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device_config = DeviceConfig()
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load_config = LoadConfig(load_format=self.server_args.load_format)
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vllm_model_config = VllmModelConfig(
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model=self.server_args.model_path,
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quantization=self.server_args.quantization,
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tokenizer=None,
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tokenizer_mode=None,
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trust_remote_code=self.server_args.trust_remote_code,
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dtype=torch.float16,
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seed=42,
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skip_tokenizer_init=True,
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)
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if self.model_config.model_overide_args is not None:
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vllm_model_config.hf_config.update(self.model_config.model_overide_args)
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self.model = get_model(
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model_config=vllm_model_config,
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device_config=device_config,
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load_config=load_config,
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lora_config=None,
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vision_language_config=None,
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parallel_config=None,
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scheduler_config=None,
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cache_config=None,
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)
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logger.info(
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f"[gpu_id={self.gpu_id}] Load weight end. "
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f"type={type(self.model).__name__}, "
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f"avail mem={get_available_gpu_memory(self.gpu_id):.2f} GB"
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)
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def profile_max_num_token(self, total_gpu_memory):
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available_gpu_memory = get_available_gpu_memory(
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self.gpu_id, distributed=self.tp_size > 1
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)
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head_dim = self.model_config.head_dim
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head_num = self.model_config.num_key_value_heads // self.tp_size
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cell_size = head_num * head_dim * self.model_config.num_hidden_layers * 2 * 2
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rest_memory = available_gpu_memory - total_gpu_memory * (
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1 - self.mem_fraction_static
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)
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max_num_token = int(rest_memory * (1 << 30) // cell_size)
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return max_num_token
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def init_memory_pool(self, total_gpu_memory):
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self.max_total_num_tokens = self.profile_max_num_token(total_gpu_memory)
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if self.max_total_num_tokens <= 0:
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raise RuntimeError(
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"Not enought memory. Please try to increase --mem-fraction-static."
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)
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self.req_to_token_pool = ReqToTokenPool(
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int(self.max_total_num_tokens / self.model_config.context_len * 256),
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self.model_config.context_len + 8,
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)
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self.token_to_kv_pool = TokenToKVPool(
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self.max_total_num_tokens,
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dtype=torch.float16,
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head_num=self.model_config.get_num_kv_heads(self.tp_size),
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head_dim=self.model_config.head_dim,
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layer_num=self.model_config.num_hidden_layers,
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)
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logger.info(
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f"[gpu_id={self.gpu_id}] Memory pool end. "
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f"avail mem={get_available_gpu_memory(self.gpu_id):.2f} GB"
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)
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@torch.inference_mode()
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def forward_prefill(self, batch: Batch):
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input_metadata = InputMetadata.create(
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self,
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forward_mode=ForwardMode.PREFILL,
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tp_size=self.tp_size,
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req_pool_indices=batch.req_pool_indices,
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seq_lens=batch.seq_lens,
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prefix_lens=batch.prefix_lens,
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position_ids_offsets=batch.position_ids_offsets,
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out_cache_loc=batch.out_cache_loc,
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top_logprobs_nums=batch.top_logprobs_nums,
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return_logprob=batch.return_logprob,
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)
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return self.model.forward(
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batch.input_ids, input_metadata.positions, input_metadata
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)
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@torch.inference_mode()
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def forward_extend(self, batch: Batch):
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input_metadata = InputMetadata.create(
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self,
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forward_mode=ForwardMode.EXTEND,
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tp_size=self.tp_size,
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req_pool_indices=batch.req_pool_indices,
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seq_lens=batch.seq_lens,
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prefix_lens=batch.prefix_lens,
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position_ids_offsets=batch.position_ids_offsets,
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out_cache_loc=batch.out_cache_loc,
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top_logprobs_nums=batch.top_logprobs_nums,
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return_logprob=batch.return_logprob,
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)
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return self.model.forward(
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batch.input_ids, input_metadata.positions, input_metadata
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)
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@torch.inference_mode()
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def forward_decode(self, batch: Batch):
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input_metadata = InputMetadata.create(
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self,
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forward_mode=ForwardMode.DECODE,
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tp_size=self.tp_size,
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req_pool_indices=batch.req_pool_indices,
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seq_lens=batch.seq_lens,
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prefix_lens=batch.prefix_lens,
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position_ids_offsets=batch.position_ids_offsets,
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out_cache_loc=batch.out_cache_loc,
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out_cache_cont_start=batch.out_cache_cont_start,
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out_cache_cont_end=batch.out_cache_cont_end,
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top_logprobs_nums=batch.top_logprobs_nums,
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return_logprob=batch.return_logprob,
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)
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return self.model.forward(
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batch.input_ids, input_metadata.positions, input_metadata
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)
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@torch.inference_mode()
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def forward_extend_multi_modal(self, batch: Batch):
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input_metadata = InputMetadata.create(
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self,
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forward_mode=ForwardMode.EXTEND,
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tp_size=self.tp_size,
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req_pool_indices=batch.req_pool_indices,
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seq_lens=batch.seq_lens,
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prefix_lens=batch.prefix_lens,
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position_ids_offsets=batch.position_ids_offsets,
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out_cache_loc=batch.out_cache_loc,
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top_logprobs_nums=batch.top_logprobs_nums,
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return_logprob=batch.return_logprob,
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)
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return self.model.forward(
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batch.input_ids,
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input_metadata.positions,
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input_metadata,
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batch.pixel_values,
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batch.image_sizes,
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batch.image_offsets,
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)
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def forward(self, batch: Batch, forward_mode: ForwardMode):
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if self.is_multimodal_model and forward_mode == ForwardMode.EXTEND:
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return self.forward_extend_multi_modal(batch)
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elif forward_mode == ForwardMode.DECODE:
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return self.forward_decode(batch)
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elif forward_mode == ForwardMode.EXTEND:
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return self.forward_extend(batch)
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elif forward_mode == ForwardMode.PREFILL:
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return self.forward_prefill(batch)
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else:
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raise ValueError(f"Invaid forward mode: {forward_mode}")
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@lru_cache()
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def import_model_classes():
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model_arch_name_to_cls = {}
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package_name = "sglang.srt.models"
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package = importlib.import_module(package_name)
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for _, name, ispkg in pkgutil.iter_modules(package.__path__, package_name + "."):
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if not ispkg:
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module = importlib.import_module(name)
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if hasattr(module, "EntryClass"):
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entry = module.EntryClass
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if isinstance(
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entry, list
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): # To support multiple model classes in one module
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for tmp in entry:
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model_arch_name_to_cls[tmp.__name__] = tmp
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else:
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model_arch_name_to_cls[entry.__name__] = entry
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# compat: some models such as chatglm has incorrect class set in config.json
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# usage: [ tuple("From_Entry_Class_Name": EntryClass), ]
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if hasattr(module, "EntryClassRemapping") and isinstance(
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module.EntryClassRemapping, list
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):
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for remap in module.EntryClassRemapping:
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if isinstance(remap, tuple) and len(remap) == 2:
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model_arch_name_to_cls[remap[0]] = remap[1]
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return model_arch_name_to_cls
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def load_model_cls_srt(model_arch: str) -> Optional[Type[nn.Module]]:
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model_arch_name_to_cls = import_model_classes()
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if model_arch not in model_arch_name_to_cls:
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raise ValueError(
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f"Unsupported architectures: {model_arch}. "
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f"Supported list: {list(model_arch_name_to_cls.keys())}"
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)
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return model_arch_name_to_cls[model_arch]
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# Monkey patch model loader
|
|
setattr(ModelRegistry, "load_model_cls", load_model_cls_srt)
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