f1ffb5fb19
### What this PR does / why we need it?
vllm model runner v2 use uva buffer to prepare input data, but npu
doesn't support uva yet, this pr implement a uvawrapper class to mimic
gpu's uva backend. what's more, this pr make some modifications to adapt
to the newer main branch.
### Does this PR introduce _any_ user-facing change?
no
### How was this patch tested?
- vLLM main:
13397841ab
---------
Signed-off-by: Ronald1995 <ronaldautomobile@163.com>
83 lines
2.8 KiB
Python
83 lines
2.8 KiB
Python
# Adapt from https://github.com/vllm-project/vllm/blob/main/vllm/v1/worker/gpu/input_batch.py
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# SPDX-License-Identifier: Apache-2.0
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# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
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# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This file is a part of the vllm-ascend project.
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#
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from dataclasses import asdict, dataclass
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import numpy as np
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import torch
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from vllm.v1.worker.gpu.input_batch import InputBatch, InputBuffers
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class AscendInputBuffers(InputBuffers):
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"""Input buffers for Ascend NPUs."""
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def __init__(
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self,
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max_num_reqs: int,
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max_num_tokens: int,
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device: torch.device,
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):
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super().__init__(
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max_num_reqs,
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max_num_tokens,
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device,
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)
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# Create seq_lens_cpu and seq_lens_np.
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# npu's attention backend still needs seq_lens on CPU side.
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self.seq_lens_cpu: torch.Tensor = torch.zeros(
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max_num_reqs,
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dtype=torch.int32,
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device="cpu",
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)
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# seq_len_np and seq_lens_cpu share the same memory.
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# define seq_lens_np for easier calculation with numpy.
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self.seq_lens_np: np.ndarray = self.seq_lens_cpu.numpy()
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@dataclass
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class AscendInputBatch(InputBatch):
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"""Input batch for Ascend NPUs."""
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# Create seq_lens_np.
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# npu's attention backend still needs seq_lens on CPU side.
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seq_lens_np: np.ndarray
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@classmethod
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def make_dummy(
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cls,
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num_reqs: int,
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num_tokens: int,
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input_buffers: AscendInputBuffers,
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device: torch.device,
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) -> "AscendInputBatch":
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"""Override the make_dummy method to calculate seq_lens_np."""
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input_batch = InputBatch.make_dummy(
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num_reqs,
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num_tokens,
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input_buffers,
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device,
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)
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# seq_len equals to query_len
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input_buffers.seq_lens_np[:num_reqs] = num_tokens // num_reqs
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input_buffers.seq_lens_np[num_reqs - 1] += num_tokens % num_reqs
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# Pad for full CUDA graph mode.
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input_buffers.seq_lens_np[num_reqs:] = 0
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seq_lens_np = input_buffers.seq_lens_np[:num_reqs]
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input_batch.seq_lens_np = seq_lens_np
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return cls(**asdict(input_batch), seq_lens_np=seq_lens_np)
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