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117 lines
4.4 KiB
Plaintext
117 lines
4.4 KiB
Plaintext
// Copyright (c) 2025 PaddlePaddle Authors. 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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#include "helper.h"
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#include "paddle/extension.h"
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__global__ void limit_thinking_content_length_kernel_v1(
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int64_t *next_tokens,
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const int *max_think_lens,
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const int64_t *step_idx,
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const int64_t *eos_token_ids,
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int *limit_think_status,
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bool *stop_flags,
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const int64_t think_end_id,
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const int bs,
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const int eos_token_id_len) {
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int bid = threadIdx.x;
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if (bid >= bs) return;
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// 如果该序列未启用思考功能，则直接返回，默认值为 -1，表示不限制思考长度
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const int max_think_len = max_think_lens[bid];
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if (max_think_len < 0) return;
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int current_limit_think_status = limit_think_status[bid];
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// 如果在回复阶段, 且已经触发停止标志, 则直接返回, 无需多余执行
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if (current_limit_think_status == 2 && stop_flags[bid]) {
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return;
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}
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int64_t next_token = next_tokens[bid];
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const int64_t step = step_idx[bid];
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// ======================= 思考阶段控制 =======================
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// 阶段 1: 仍在思考 (status == 0), 检查是否需要强制结束
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if (current_limit_think_status < 1) {
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// 当开启思考长度控制时，检查是否超时
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if (step >= max_think_len) {
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// 强制将当前token替换为结束思考的token
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next_token = think_end_id;
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// 将状态推进到 1, 表示 "正在结束思考"
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current_limit_think_status = 1;
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} else {
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// 检查是否生成了EOS
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for (int i = 0; i < eos_token_id_len; i++) {
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if (eos_token_ids[i] == next_token) {
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// 强制将当前token替换为结束思考的token
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next_token = think_end_id;
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// 将状态推进到 1, 表示 "正在结束思考"
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current_limit_think_status = 1;
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if (stop_flags[bid]) {
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stop_flags[bid] = false;
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}
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break;
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}
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}
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}
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}
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// ======================= 思考结束处理 =======================
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// 阶段 2: 检查是否已满足结束思考的条件 (status < 2)
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// 这种情况会处理两种场景:
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// 1. status == 0: 模型自己生成了 think_end_id
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// 2. status == 1: 上一阶段强制注入了 think_end_id
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if (current_limit_think_status < 2) {
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if (next_token == think_end_id) {
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// 确认思考结束，将状态推进到 2 (响应阶段)
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current_limit_think_status = 2;
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}
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}
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// 写回更新后的 token
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next_tokens[bid] = next_token;
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// 更新全局状态
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limit_think_status[bid] = current_limit_think_status;
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}
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void LimitThinkingContentLengthV1(const paddle::Tensor &next_tokens,
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const paddle::Tensor &max_think_lens,
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const paddle::Tensor &step_idx,
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const paddle::Tensor &limit_think_status,
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const paddle::Tensor &stop_flags,
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const paddle::Tensor &eos_token_ids,
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const int64_t think_end_id) {
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const int batch_size = next_tokens.shape()[0];
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const int eos_token_id_len = eos_token_ids.shape()[0];
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limit_thinking_content_length_kernel_v1<<<1, 1024, 0, next_tokens.stream()>>>(
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const_cast<int64_t *>(next_tokens.data<int64_t>()),
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max_think_lens.data<int>(),
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step_idx.data<int64_t>(),
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eos_token_ids.data<int64_t>(),
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const_cast<int *>(limit_think_status.data<int>()),
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const_cast<bool *>(stop_flags.data<bool>()),
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think_end_id,
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batch_size,
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eos_token_id_len);
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}
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PD_BUILD_STATIC_OP(limit_thinking_content_length_v1)
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.Inputs({"next_tokens",
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"max_think_lens",
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"step_idx",
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"limit_think_status",
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"stop_flags",
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"eos_token_ids"})
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.Attrs({"think_end_id: int64_t"})
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.Outputs({"next_tokens_out"})
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.SetInplaceMap({{"next_tokens", "next_tokens_out"}})
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.SetKernelFn(PD_KERNEL(LimitThinkingContentLengthV1));
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