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这将帮助您开始使用 LangChain 的 FireworksEmbeddings 嵌入模型。有关 FireworksEmbeddings 功能和配置选项的详细文档，请参阅API 参考。

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概览

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集成详情

类别包本地Python 支持下载量版本
FireworksEmbeddings@langchain/community❌✅NPM - DownloadsNPM - Version

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设置

要访问 Fireworks 嵌入模型，您需要创建一个 Fireworks 账户，获取 API 密钥，并安装 @langchain/community 集成包。

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凭据

前往fireworks.ai注册 Fireworks 并生成 API 密钥。完成后，设置 FIREWORKS_API_KEY 环境变量 
export FIREWORKS_API_KEY="your-api-key"
如果您想获取模型调用的自动化跟踪，您还可以通过取消注释下方来设置您的 LangSmith API 密钥 
# export LANGSMITH_TRACING="true"
# export LANGSMITH_API_KEY="your-api-key"

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安装

LangChain FireworksEmbeddings 集成位于 @langchain/community 包中 
npm install @langchain/community @langchain/core

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实例化

现在我们可以实例化我们的模型对象并生成聊天完成 
import { FireworksEmbeddings } from "@langchain/community/embeddings/fireworks";

const embeddings = new FireworksEmbeddings({
  modelName: "nomic-ai/nomic-embed-text-v1.5",
});

​
索引和检索

嵌入模型通常用于检索增强生成 (RAG) 流程中，既作为索引数据的一部分，也用于后续检索数据。有关更详细的说明，请参阅学习选项卡下的 RAG 教程。 下面，我们将演示如何使用我们上面初始化的 embeddings 对象来索引和检索数据。在此示例中，我们将使用演示 MemoryVectorStore 索引和检索一个示例文档。
// Create a vector store with a sample text
import { MemoryVectorStore } from "@langchain/classic/vectorstores/memory";

const text = "LangChain is the framework for building context-aware reasoning applications";

const vectorstore = await MemoryVectorStore.fromDocuments(
  [{ pageContent: text, metadata: {} }],
  embeddings,
);

// Use the vector store as a retriever that returns a single document
const retriever = vectorstore.asRetriever(1);

// Retrieve the most similar text
const retrievedDocuments = await retriever.invoke("What is LangChain?");

retrievedDocuments[0].pageContent;

"LangChain is the framework for building context-aware reasoning applications"

​
直接使用

在底层，向量存储和检索器实现分别调用 embeddings.embedDocument(...) 和 embeddings.embedQuery(...) 来为 fromDocuments 和检索器的 invoke 操作中使用的文本创建嵌入。 您可以直接调用这些方法来获取您自己用例的嵌入。

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嵌入单个文本

您可以使用 embedQuery 嵌入查询以进行搜索。这会生成特定于查询的向量表示。 
const singleVector = await embeddings.embedQuery(text);

console.log(singleVector.slice(0, 100));

[
        0.01666259765625,      0.011688232421875,          -0.1181640625,
          -0.10205078125,       0.05438232421875,      -0.08905029296875,
      -0.018096923828125,    0.00952911376953125,         -0.08056640625,
     -0.0283050537109375,   -0.01512908935546875,     0.0312042236328125,
        0.08197021484375,      0.022552490234375,  0.0012683868408203125,
         0.0133056640625,      -0.04327392578125,  -0.004322052001953125,
       -0.02410888671875, -0.0012350082397460938,      -0.04632568359375,
        0.02996826171875,    -0.0134124755859375,     -0.037811279296875,
        0.07672119140625,      0.021759033203125,     0.0179290771484375,
  -0.0002741813659667969,       -0.0582275390625,    -0.0224456787109375,
   0.0027675628662109375,     -0.017425537109375,   -0.01520538330078125,
    -0.01146697998046875,     -0.055267333984375,           -0.083984375,
       0.056793212890625,  -0.003383636474609375,     -0.034271240234375,
        0.05108642578125,   -0.01018524169921875,        0.0462646484375,
   0.0012178421020507812,   0.005779266357421875,        0.0684814453125,
     0.00797271728515625,    -0.0176544189453125,    0.00257110595703125,
       0.059539794921875,      -0.06573486328125,        -0.075439453125,
     -0.0247344970703125,    -0.0276947021484375,   0.003940582275390625,
        0.02630615234375,        0.0660400390625,        0.0157470703125,
       0.033050537109375,          -0.0478515625,      -0.03338623046875,
       0.050384521484375,       0.07757568359375,        -0.045166015625,
        0.07586669921875,  0.0021915435791015625,     0.0237579345703125,
      -0.052703857421875,       0.05023193359375,    -0.0274810791015625,
  -0.0025081634521484375,         0.019287109375,      -0.03802490234375,
      0.0216217041015625,      0.025360107421875,         -0.04443359375,
      -0.029205322265625,  -0.002414703369140625,      0.027130126953125,
       0.028961181640625,         0.078857421875, -0.0009660720825195312,
       0.017608642578125,       0.05755615234375,    -0.0285797119140625,
      0.0039215087890625,  -0.006908416748046875,      -0.05364990234375,
    -0.01342010498046875,       -0.0247802734375,       0.08331298828125,
       0.032928466796875,    0.00543975830078125,    -0.0168304443359375,
      -0.050018310546875,         -0.05908203125,      0.031951904296875,
     -0.0200347900390625,      0.019134521484375,     -0.018035888671875,
    -0.01178741455078125
]

​
嵌入多个文本

您可以使用 embedDocuments 嵌入多个文本以进行索引。此方法使用的内部机制可能（但不一定）与嵌入查询不同。 
const text2 = "LangGraph is a library for building stateful, multi-actor applications with LLMs";

const vectors = await embeddings.embedDocuments([text, text2]);

console.log(vectors[0].slice(0, 100));
console.log(vectors[1].slice(0, 100));

[
       0.016632080078125,    0.01165008544921875,          -0.1181640625,
       -0.10186767578125,       0.05438232421875,      -0.08905029296875,
     -0.0180511474609375,    0.00957489013671875,         -0.08056640625,
           -0.0283203125,    -0.0151214599609375,        0.0311279296875,
        0.08184814453125,     0.0225982666015625,  0.0012750625610351562,
        0.01336669921875,     -0.043365478515625,  -0.004322052001953125,
       -0.02410888671875, -0.0012559890747070312,     -0.046356201171875,
      0.0298919677734375,     -0.013458251953125,      -0.03765869140625,
        0.07672119140625,     0.0217132568359375,     0.0179290771484375,
  -0.0002269744873046875,       -0.0582275390625,          -0.0224609375,
    0.002834320068359375,    -0.0174407958984375,   -0.01512908935546875,
    -0.01146697998046875,     -0.055206298828125,      -0.08404541015625,
         0.0567626953125, -0.0033092498779296875,     -0.034271240234375,
        0.05108642578125,     -0.010101318359375,      0.046173095703125,
   0.0011806488037109375,      0.005706787109375,       0.06854248046875,
      0.0079193115234375,    -0.0176239013671875,   0.002552032470703125,
       0.059539794921875,      -0.06573486328125,      -0.07537841796875,
       -0.02484130859375,     -0.027740478515625,   0.003925323486328125,
            0.0263671875,        0.0660400390625,     0.0156402587890625,
       0.033050537109375,     -0.047821044921875,       -0.0333251953125,
       0.050445556640625,       0.07757568359375,     -0.045257568359375,
        0.07586669921875,  0.0021724700927734375,     0.0237274169921875,
      -0.052703857421875,      0.050323486328125,       -0.0274658203125,
  -0.0024662017822265625,     0.0194244384765625,      -0.03802490234375,
        0.02166748046875,      0.025360107421875,     -0.044464111328125,
     -0.0292816162109375, -0.0025119781494140625,     0.0271148681640625,
       0.028961181640625,         0.078857421875, -0.0008907318115234375,
       0.017669677734375,           0.0576171875,    -0.0285797119140625,
      0.0039825439453125,   -0.00687408447265625,       -0.0535888671875,
     -0.0134735107421875,    -0.0247650146484375,        0.0831298828125,
       0.032989501953125,   0.005443572998046875,    -0.0167999267578125,
      -0.050018310546875,     -0.059051513671875,        0.0318603515625,
     -0.0200958251953125,     0.0191192626953125,    -0.0180206298828125,
    -0.01175689697265625
]
[
       -0.02667236328125,      0.036651611328125,         -0.1630859375,
        -0.0904541015625,     -0.022430419921875,       -0.095458984375,
      -0.037628173828125,    0.00473785400390625,    -0.046051025390625,
      0.0109710693359375,        0.0113525390625,    0.0254364013671875,
        0.09368896484375,     0.0144195556640625, -0.007564544677734375,
  -0.0014705657958984375, -0.0007691383361816406,    -0.015716552734375,
     -0.0242156982421875,     -0.024871826171875,      0.00885009765625,
   0.0012922286987304688,      0.023712158203125,    -0.054595947265625,
        0.06329345703125,        0.0289306640625,    0.0233612060546875,
        -0.0374755859375,       -0.0489501953125,    -0.029510498046875,
      0.0173492431640625,     0.0171356201171875,     -0.01629638671875,
        -0.0352783203125,     -0.039398193359375,     -0.11138916015625,
      0.0296783447265625,   -0.01467132568359375, 0.0009188652038574219,
       0.048187255859375,     -0.010650634765625,               0.03125,
    0.005214691162109375,        -0.015869140625,      0.06939697265625,
        -0.0428466796875,     0.0266571044921875,        0.044189453125,
       0.049957275390625,     -0.054290771484375,    0.0107574462890625,
       -0.03265380859375,    -0.0109100341796875,   -0.0144805908203125,
        0.03936767578125,       0.07989501953125,    -0.056976318359375,
      0.0308380126953125,     -0.035125732421875,    -0.038848876953125,
        0.10748291015625,       0.01129150390625,      -0.0665283203125,
        0.09710693359375,       0.03143310546875,   -0.0104522705078125,
      -0.062469482421875,      0.021148681640625,     -0.00970458984375,
       -0.06756591796875,       0.01019287109375,      0.00433349609375,
       0.032928466796875,      0.020233154296875,     -0.01336669921875,
      -0.015472412109375,    -0.0175933837890625,   -0.0142364501953125,
   -0.007450103759765625,          0.03759765625,  0.003551483154296875,
         0.0069580078125,      0.042266845703125, -0.007488250732421875,
        0.01922607421875,         0.007080078125,   -0.0255889892578125,
   -0.007686614990234375,       -0.0848388671875,     0.058563232421875,
       0.021148681640625,      0.034393310546875,   0.01087188720703125,
     -0.0196380615234375,      -0.09515380859375,       0.0054931640625,
      -0.012481689453125,   0.003322601318359375,    -0.019683837890625,
     -0.0307159423828125
]

​
API 参考

有关所有 FireworksEmbeddings 功能和配置的详细文档，请参阅API 参考。
在 GitHub 上编辑此页面源文件。
以编程方式连接这些文档到 Claude、VSCode 等，通过 MCP 获取实时答案。
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