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coding-agent


			
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  <h1>5.3 RAG评估数据集的构造(扩展)</h1>

<h2 id="_1">学习目标<a class="headerlink" href="#_1" title="Permanent link">¶</a></h2>
<ul>
<li>掌握RAG性能评估的指标</li>
<li>实现RAG评估数据集的构造</li>
</ul>
<h2 id="_2">一、引言<a class="headerlink" href="#_2" title="Permanent link">¶</a></h2>
<p>优化 RAG 不是“炼丹”，需要系统的方法。当涉及到如何优化 RAG（Retrieval-Augmented Generation）性能时，许多人往往采取“试错”的方法：“我尝试了一个新模块，问了几个问题，答案看起来还行…”。这样的定性评估方式虽然直观，但很难得出可靠的改进结论。</p>
<p>优化 RAG 性能需要采用科学实验的方式。这意味着我们必须设计量化的评估指标，并准备高质量的评估数据集。通过结构化的实验和评估方法，我们才能明确什么样的调整会真正提升性能。</p>
<h2 id="rag">二、结构化评估 RAG 的性能<a class="headerlink" href="#rag" title="Permanent link">¶</a></h2>
<p>RAG 系统的性能评估可以从以下两个主要方面进行：</p>
<ul>
<li>
<p>检索评估（Retrieval Evaluation）： 检索的段落是否相关？</p>
</li>
<li>
<p>生成评估（Generation Evaluation）： 模型生成的答案是否恰当？</p>
</li>
</ul>
<p>对于端到端的评估，我们通常关注以下四类指标：</p>
<ul>
<li>Groundedness（可靠性）： 检索评估中的关键指标，评估检索的段落是否为生成的答案提供了可靠支持，避免幻觉（hallucinations）或无关信息。这是生成评估的基础。</li>
<li>Completeness（完整性）： 生成评估的核心指标，用于评估模型的回答是否全面覆盖了用户问题的所有方面，同时间接反映了检索阶段的信息充分性。</li>
<li>Utilization（利用率）： 连接检索和生成的桥梁指标，用来评估检索到的信息是否被有效利用。如果利用率低，可能意味着检索到的段落与问题无关，或者模型未充分使用这些段落。</li>
<li>Relevance（相关性）： 检索评估的直接反映，衡量检索到的段落与用户问题之间的相关性，同时也会影响生成评估的整体表现。</li>
</ul>
<p>这些指标需要基于高质量的测试样本和严格的评估流程。</p>
<h2 id="agents-rag">三、使用 Agents 完成 RAG 性能基准测试<a class="headerlink" href="#agents-rag" title="Permanent link">¶</a></h2>
<p>在开始具体流程前，我们需要了解三个代理（Agents）的协作关系：</p>
<ul>
<li>测试样本代理（Test Sample Agent）： 用于生成和准备测试数据，这些数据构成了评估系统的基础。</li>
<li>样本质量评价代理（Critique Agent）： 对测试样本进行质量审核，确保最终用于评估的数据具备高准确性和清晰性。</li>
<li>评估代理（Evaluation Agent）： 负责根据设计的指标对系统性能进行量化评估。这些评估指标覆盖了检索和生成的多个层面。</li>
</ul>
<p>通过这三种代理的协作，可以建立一个系统化的性能基准测试流程，帮助开发者深入理解和优化 RAG 系统。</p>
<h3 id="1">1 生成测试样本<a class="headerlink" href="#1" title="Permanent link">¶</a></h3>
<p>为了评估 RAG 系统的性能，首先需要使用测试样本代理（Test Sample Agent） 生成测试样本。这些代理可以自动生成一组高质量的 QA 样本（问题与答案对）。例如，可以先生成 10 个样本用于快速测试，然后从公共资源库加载更多样本，或者生成更大规模的数据集以供全面评估。</p>
<p>但如果针对特定的知识库，建议生成至少 200 个样本，因为后续通过评价代理过滤掉低质量问题后，最终能保留的有效样本约为一半。</p>
<p>以下是生成QA样本的提示词：</p>
<div class="highlight"><pre><span></span><code><span class="na">QA_generation_prompt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"""  </span>
<span class="na">你的任务是：根据给定的上下文，编写一个事实型问题及其答案。</span><span class="w">  </span>
<span class="na">你提出的事实型问题应能通过上下文中的具体、简明的事实信息来回答。</span><span class="w">  </span>
<span class="na">你的问题风格应与用户在搜索引擎中提出的问题类似。</span><span class="w">  </span>
<span class="na">这意味着你提出的问题**不能**包含“根据段落”或“根据上下文”等措辞。</span><span class="w">  </span>

<span class="na">请按以下格式给出你的输出：</span><span class="w">  </span>

<span class="na">输出</span><span class="o">:</span><span class="s">::  </span>
<span class="na">事实型问题：（你的问题）</span><span class="w">  </span>
<span class="na">答案：（你对该问题的回答）</span><span class="w">  </span>

<span class="na">以下是上下文内容：</span><span class="w">  </span>

<span class="na">上下文：{context}</span><span class="se">\n</span><span class="w">  </span>
<span class="na">输出</span><span class="o">:</span><span class="s">::"""</span>
</code></pre></div>
<h3 id="2">2 检查样本质量<a class="headerlink" href="#2" title="Permanent link">¶</a></h3>
<p>自动生成的样本可能存在质量问题，因此需要引入样本质量评价代理（Critique Agents） 来对问题进行质量审查。这些代理会根据多种标准对每个问题评分，比如：</p>
<ul>
<li>问题是否清晰、无二义性？</li>
<li>问题是否适合特定知识领域？</li>
</ul>
<p>我们通过这些代理对问题进行系统评分。当任意一个代理的评分过低时，直接剔除该问题。</p>
<blockquote>
<p>提示： 当让代理生成分数时，先要求其输出理由，再给出最终评分。这种方式不仅能帮助我们验证评分结果，还能促使代理在回答过程中进行更深入的思考，从而提高评分的准确性。</p>
</blockquote>
<p>以下是评估样本质量的提示词：</p>
<div class="highlight"><pre><span></span><code><span class="na">question_groundedness_critique_prompt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"""  </span>
<span class="na">你将获得一个上下文和一个问题。</span><span class="w">  </span>
<span class="na">你的任务是给出一个“总评分”，评估该问题是否能够通过给定的上下文明确无歧义地回答。</span><span class="w">  </span>
<span class="na">请在1到5分之间进行评分，其中1表示完全无法根据上下文回答该问题，5表示能够清晰且无歧义地根据上下文回答该问题。</span><span class="w">  </span>

<span class="na">请按以下格式给出你的回答：</span><span class="w">  </span>

<span class="na">回答</span><span class="o">:</span><span class="s">::  </span>
<span class="na">评价：（你对评分的理由，文本形式）</span><span class="w">  </span>
<span class="na">总评分：（你给出的评分，范围为1到5的数字）</span><span class="w">  </span>

<span class="na">你的回答**必须包含**“评价”和“总评分”的内容。</span><span class="w">  </span>

<span class="na">现在是问题和上下文内容：</span><span class="w">  </span>

<span class="na">问题：{question}</span><span class="se">\n</span><span class="w">  </span>
<span class="na">上下文：{context}</span><span class="se">\n</span><span class="w">  </span>
<span class="na">回答</span><span class="o">:</span><span class="s">:: """</span>

<span class="na">question_relevance_critique_prompt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"""  </span>
<span class="na">你将获得一个问题。</span><span class="w">  </span>
<span class="na">你的任务是给出一个“总评分”，表示该问题对于正在使用</span><span class="w"> </span><span class="s">Hugging Face 生态构建自然语言处理应用的机器学习开发者来说有多有用。  </span>
<span class="na">请在1到5分之间进行评分，其中1表示完全没有用，5表示非常有用。</span><span class="w">  </span>

<span class="na">请按以下格式给出你的回答：</span><span class="w">  </span>

<span class="na">回答</span><span class="o">:</span><span class="s">::  </span>
<span class="na">评价：（你对评分的理由，文本形式）</span><span class="w">  </span>
<span class="na">总评分：（你给出的评分，范围为1到5的数字）</span><span class="w">  </span>

<span class="na">你的回答**必须包含**“评价”和“总评分”的内容。</span><span class="w">  </span>

<span class="na">现在是该问题：</span><span class="w">  </span>

<span class="na">问题：{question}</span><span class="se">\n</span><span class="w">  </span>
<span class="na">回答</span><span class="o">:</span><span class="s">:: """</span>

<span class="na">question_standalone_critique_prompt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"""  </span>
<span class="na">你将获得一个问题。</span><span class="w">  </span>
<span class="na">你的任务是给出一个“总评分”，评估该问题在多大程度上是独立于上下文的。</span><span class="w">  </span>
<span class="na">请在1到5分之间进行评分，其中1表示该问题需要额外信息才能理解，5表示该问题本身就可以被理解。</span><span class="w">  </span>
<span class="na">例如，如果问题提到了“在该文档中”或“在该上下文中”等字样，那么评分必须为1。</span><span class="w">  </span>
<span class="na">即使问题包含专业术语或缩写（如</span><span class="w"> </span><span class="s">Gradio、Hub、Hugging Face 或 Space），只要操作人员可以通过文档理解其含义，评分也可以是5。  </span>

<span class="na">例如，“ViT</span><span class="w"> </span><span class="s">模型是从哪个检查点导入的？” 应该得分为 1，因为它隐含了上下文的依赖，因此不具有独立性。  </span>

<span class="na">请按以下格式给出你的回答：</span><span class="w">  </span>

<span class="na">回答</span><span class="o">:</span><span class="s">::  </span>
<span class="na">评价：（你对评分的理由，文本形式）</span><span class="w">  </span>
<span class="na">总评分：（你给出的评分，范围为1到5的数字）</span><span class="w">  </span>

<span class="na">你的回答**必须包含**“评价”和“总评分”的内容。</span><span class="w">  </span>

<span class="na">现在是该问题：</span><span class="w">  </span>

<span class="na">问题：{question}</span><span class="se">\n</span><span class="w">  </span>
<span class="na">回答</span><span class="o">:</span><span class="s">:: """</span>
</code></pre></div>
<h3 id="3">3 设置评估代理<a class="headerlink" href="#3" title="Permanent link">¶</a></h3>
<p>最后，我们需要评估 RAG 系统在测试数据集上的表现。可以通过以下步骤完成：</p>
<ul>
<li>
<p>选择评估指标：</p>
</li>
<li>
<p>我们重点关注faithfulness（可靠性） 作为主要指标，因为它能全面反映系统的端到端性能。</p>
</li>
<li>
<p>选择评估模型：
  使用 GPT-4 作为评估代理，或者尝试其他性能良好的模型，如 kaist-ai/prometheus-13b-v1.0 或 BAAI/JudgeLM-33B-v1.0。</p>
</li>
<li>
<p>设计评估提示词：
  提示词需要详细描述每个指标的评分标准（例如 1-5 分），并要求模型在评分前先输出评分依据。</p>
</li>
</ul>
<blockquote>
<p>提示： 提供详细的评分标准有助于评估代理保持一致性，避免因模糊标准导致评分结果的波动。</p>
</blockquote>
<p>以下是 RAG 评估模型的提示词：</p>
<div class="highlight"><pre><span></span><code><span class="n">EVALUATION_PROMPT</span> <span class="o">=</span> <span class="s2">"""### 任务描述：</span>
<span class="s2">提供了一条指令（可能包含输入）、待评估的回答、得分为 5 的参考答案，以及表示评估标准的评分细则。  </span>
<span class="s2">1. 根据给定的评分细则，严格评估回答的质量，撰写详细的反馈，不进行一般性评价。  </span>
<span class="s2">2. 在撰写反馈后，给出一个 1 到 5 的整数分数，需参考评分细则。  </span>
<span class="s2">3. 输出格式应如下：“Feedback: {{针对标准的反馈}} [RESULT] {{1 到 5 的整数}}”  </span>
<span class="s2">4. 请勿生成其他开场、结尾或解释内容。确保输出包含 [RESULT]。  </span>

<span class="s2">### 待评估的指令：  </span>
<span class="si">{instruction}</span><span class="s2">  </span>

<span class="s2">### 待评估的回答：  </span>
<span class="si">{response}</span><span class="s2">  </span>

<span class="s2">### 参考答案（得分 5）：  </span>
<span class="si">{reference_answer}</span><span class="s2">  </span>

<span class="s2">### 评分细则：  </span>
<span class="s2">[回答是否基于参考答案正确、准确且符合事实？]  </span>
<span class="s2">得分 1：回答完全不正确、不准确和/或不符合事实。  </span>
<span class="s2">得分 2：回答大部分不正确、不准确和/或不符合事实。  </span>
<span class="s2">得分 3：回答部分正确、准确和/或符合事实。  </span>
<span class="s2">得分 4：回答大部分正确、准确且符合事实。  </span>
<span class="s2">得分 5：回答完全正确、准确且符合事实。  </span>

<span class="s2">### 反馈："""</span>  

<span class="kn">from</span><span class="w"> </span><span class="nn">langchain.prompts.chat</span><span class="w"> </span><span class="kn">import</span> <span class="p">(</span>  
    <span class="n">ChatPromptTemplate</span><span class="p">,</span>  
    <span class="n">HumanMessagePromptTemplate</span><span class="p">,</span>  
<span class="p">)</span>  
<span class="kn">from</span><span class="w"> </span><span class="nn">langchain.schema</span><span class="w"> </span><span class="kn">import</span> <span class="n">SystemMessage</span>  


<span class="n">evaluation_prompt_template</span> <span class="o">=</span> <span class="n">ChatPromptTemplate</span><span class="o">.</span><span class="n">from_messages</span><span class="p">(</span>  
    <span class="p">[</span>  
        <span class="n">SystemMessage</span><span class="p">(</span><span class="n">content</span><span class="o">=</span><span class="s2">"You are a fair evaluator language model."</span><span class="p">),</span>  
        <span class="n">HumanMessagePromptTemplate</span><span class="o">.</span><span class="n">from_template</span><span class="p">(</span><span class="n">EVALUATION_PROMPT</span><span class="p">),</span>  
    <span class="p">]</span>  
<span class="p">)</span>  
</code></pre></div>
<h2 id="_3">本章小结<a class="headerlink" href="#_3" title="Permanent link">¶</a></h2>
<p>准备高质量的评估数据集是优化 RAG 性能的基础。通过引入生成代理和评价代理，我们可以建立一个系统化的评估流程，确保每个调整都有量化依据。这种基于数据驱动的方法不仅能帮助开发者快速迭代 RAG 系统，还能避免无效尝试导致的时间浪费。</p>


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