mirror of
https://github.com/NVIDIA/TensorRT-LLM.git
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103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
/*
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* Copyright (c) 2024, NVIDIA CORPORATION. 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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*/
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#pragma once
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#include "tensorrt_llm/common/assert.h"
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#include "tensorrt_llm/common/cudaUtils.h"
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#include "tensorrt_llm/runtime/iTensor.h"
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#include <vector>
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namespace tensorrt_llm::runtime
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{
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class MedusaModule
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{
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public:
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using TensorPtr = ITensor::SharedPtr;
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using MedusaChoices = std::vector<std::vector<SizeType>>;
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explicit MedusaModule(SizeType medusaHeads, SizeType maxMedusaTokens) noexcept
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: mMedusaHeads(medusaHeads)
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, mMaxMedusaTokens(maxMedusaTokens)
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, mTokensPerStep(mMaxMedusaTokens + 1)
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{
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mNumPackedMasks = tensorrt_llm::common::divUp(mTokensPerStep, 32);
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}
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explicit MedusaModule() noexcept
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: MedusaModule(0, 0)
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{
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}
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MedusaModule(MedusaModule const& o) = default;
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MedusaModule& operator=(MedusaModule const& o) = default;
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[[nodiscard]] SizeType medusaHeads() const noexcept
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{
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return mMedusaHeads;
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}
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[[nodiscard]] SizeType maxMedusaTokens() const noexcept
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{
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return mMaxMedusaTokens;
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}
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[[nodiscard]] SizeType tokensPerStep() const noexcept
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{
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return mTokensPerStep;
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}
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[[nodiscard]] SizeType numPackedMasks() const noexcept
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{
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return mNumPackedMasks;
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}
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void initMedusaTensorsFromChoices(MedusaChoices& choices, TensorPtr& topKs, TensorPtr& positionOffsets,
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TensorPtr& treeIds, TensorPtr& paths, TensorPtr& packedMask, SizeType& totalPaths) const noexcept;
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private:
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using Prefix = uint64_t;
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static SizeType constexpr PREFIX_CHUNK_SIZE_BITS = 4;
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static SizeType constexpr PREFIX_MAX_VALUE = 16;
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struct MedusaTreeNode
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{
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SizeType nodeId;
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SizeType depth;
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SizeType parentLinearIdx;
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SizeType linearIdx;
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std::vector<SizeType> childLinearIndices;
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};
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SizeType computePathsAndMask(
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std::vector<MedusaTreeNode> const& tree, TensorPtr& packedMask, TensorPtr& paths) const;
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void copyPackedMask(TensorPtr& mask, SizeType srcIdx, SizeType dstIdx) const;
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void setOnePackedMask(TensorPtr& mask, SizeType row, SizeType col) const;
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Prefix computePrefix(std::vector<SizeType> const& vec, SizeType len) const;
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void dumpChoices(MedusaChoices const& choices, std::vector<SizeType> const& indices) const;
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private:
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SizeType mMedusaHeads;
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SizeType mMaxMedusaTokens;
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SizeType mTokensPerStep;
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SizeType mNumPackedMasks;
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MedusaChoices mMedusaChoices;
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};
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} // namespace tensorrt_llm::runtime
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