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Prediction Guard 是一个安全、可扩展的 GenAI 平台，能够保护敏感数据、防止常见的 AI 故障，并在经济实惠的硬件上运行。

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概述

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集成详情

本集成展示了如何在 LangChain 中使用 Prediction Guard 嵌入集成。此集成支持文本和图像，可以单独使用，也可以成对组合使用。

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设置

要访问 Prediction Guard 模型，请在此联系我们以获取 Prediction Guard API 密钥并开始使用。

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凭据

获得密钥后，可以通过以下方式设置： 
import os

os.environ["PREDICTIONGUARD_API_KEY"] = "<Prediction Guard API Key"

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安装

pip install -qU langchain-predictionguard

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实例化

首先，安装 Prediction Guard 和 LangChain 包。然后，设置所需的环境变量并导入包。 
from langchain_predictionguard import PredictionGuardEmbeddings

embeddings = PredictionGuardEmbeddings(model="bridgetower-large-itm-mlm-itc")
Prediction Guard 嵌入生成同时支持文本和图像。此集成通过各种函数提供该支持。

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索引与检索

# Create a vector store with a sample text
from langchain_core.vectorstores import InMemoryVectorStore

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

vectorstore = InMemoryVectorStore.from_texts(
    [text],
    embedding=embeddings,
)

# Use the vectorstore as a retriever
retriever = vectorstore.as_retriever()

# Retrieve the most similar text
retrieved_documents = retriever.invoke("What is LangChain?")

# Show the retrieved document's content
retrieved_documents[0].page_content

'LangChain is the framework for building context-aware reasoning applications.'

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直接使用

向量存储和检索器实现通过调用 embeddings.embed_documents(...) 和 embeddings.embed_query(...) 来从 from_texts 和检索 invoke 操作中使用的文本创建嵌入。 这些方法可以使用以下命令直接调用。

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嵌入单个文本

# Embedding a single string
text = "This is an embedding example."
single_vector = embeddings.embed_query(text)

single_vector[:5]

[0.01456777285784483,
 -0.08131945133209229,
 -0.013045587576925755,
 -0.09488929063081741,
 -0.003087474964559078]

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嵌入多个文本

# Embedding multiple strings
docs = [
    "This is an embedding example.",
    "This is another embedding example.",
]

two_vectors = embeddings.embed_documents(docs)

for vector in two_vectors:
    print(vector[:5])

[0.01456777285784483, -0.08131945133209229, -0.013045587576925755, -0.09488929063081741, -0.003087474964559078]
[-0.0015021917643025517, -0.08883760124444962, -0.0025286630261689425, -0.1052245944738388, 0.014225339516997337]

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嵌入单个图像

# Embedding a single image. These functions accept image URLs, image files, data URIs, and base64 encoded strings.
image = [
    "https://farm4.staticflickr.com/3300/3497460990_11dfb95dd1_z.jpg",
]
single_vector = embeddings.embed_images(image)

print(single_vector[0][:5])

[0.0911610797047615, -0.034427884966135025, 0.007927080616354942, -0.03500846028327942, 0.022317267954349518]

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嵌入多个图像

# Embedding multiple images
images = [
    "https://fastly.picsum.photos/id/866/200/300.jpg?hmac=rcadCENKh4rD6MAp6V_ma-AyWv641M4iiOpe1RyFHeI",
    "https://farm4.staticflickr.com/3300/3497460990_11dfb95dd1_z.jpg",
]

two_vectors = embeddings.embed_images(images)

for vector in two_vectors:
    print(vector[:5])

[0.1593627631664276, -0.03636132553219795, -0.013229663483798504, -0.08789524435997009, 0.062290553003549576]
[0.0911610797047615, -0.034427884966135025, 0.007927080616354942, -0.03500846028327942, 0.022317267954349518]

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嵌入单个文本-图像对

# Embedding a single text-image pair
inputs = [
    {
        "text": "This is an embedding example.",
        "image": "https://farm4.staticflickr.com/3300/3497460990_11dfb95dd1_z.jpg",
    },
]
single_vector = embeddings.embed_image_text(inputs)

print(single_vector[0][:5])

[0.0363212488591671, -0.10172265768051147, -0.014760786667466164, -0.046511903405189514, 0.03860781341791153]

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嵌入多个文本-图像对

# Embedding multiple text-image pairs
inputs = [
    {
        "text": "This is an embedding example.",
        "image": "https://fastly.picsum.photos/id/866/200/300.jpg?hmac=rcadCENKh4rD6MAp6V_ma-AyWv641M4iiOpe1RyFHeI",
    },
    {
        "text": "This is another embedding example.",
        "image": "https://farm4.staticflickr.com/3300/3497460990_11dfb95dd1_z.jpg",
    },
]
two_vectors = embeddings.embed_image_text(inputs)

for vector in two_vectors:
    print(vector[:5])

[0.11867266893386841, -0.05898813530802727, -0.026179173961281776, -0.10747235268354416, 0.07684746384620667]
[0.026654226705431938, -0.10080841928720474, -0.012732953764498234, -0.04365091398358345, 0.036743905395269394]

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API 参考

有关所有 PredictionGuardEmbeddings 功能和配置的详细文档，请查看 API 参考：python.langchain.com/api_reference/community/embeddings/langchain_community.embeddings.predictionguard.PredictionGuardEmbeddings.html
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