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131 lines
6.4 KiB
Plaintext
131 lines
6.4 KiB
Plaintext
---
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title: Manage vector data
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slug: /knowledge
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---
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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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import Icon from "@site/src/components/icon";
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import PartialGlobalModelProviders from '@site/docs/_partial-global-model-providers.mdx';
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Vector data is critical to AI applications.
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Langflow provides several components to help you store and retrieve vector data in your flows, including embedding models, vector stores, and knowledge bases.
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## Embedding models
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Embedding model components generate text embeddings using a specified Large Language Model (LLM).
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There are two common use cases for these components:
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* **Store vectors**: Generate embeddings for content written to a vector database.
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* **Search vectors**: Generate an embedding from a query to run a similarity search.
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In both cases the embedding model component is attached to a vector store component.
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For more information, examples, and available options, see [Embedding model components](/components-embedding-models).
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Alternatively, you can use [knowledge bases](#knowledge-bases), which include built-in support for several embedding models.
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## Vector stores
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Vector store components read and write to vector databases.
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Typically, these components connect to remote databases, but some vector store components support local databases.
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import PartialVectorRagBlurb from '@site/docs/_partial-vector-rag-blurb.mdx';
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<PartialVectorRagBlurb />
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<details>
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<summary>Example: Vector search flow</summary>
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import PartialVectorRagFlow from '@site/docs/_partial-vector-rag-flow.mdx';
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<PartialVectorRagFlow />
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</details>
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## Knowledge bases
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import PartialKbSummary from '@site/docs/_partial-kb-summary.mdx';
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<PartialKbSummary />
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### Knowledge base storage locations
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Each knowledge base is a [ChromaDB](https://docs.trychroma.com/docs/overview/introduction) vector database.
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Each database is stored in a separate directory that contains the following:
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- **Vector embeddings**: Embeddings are stored using the Chroma vector database.
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- **Metadata files**: Configuration and embedding model information.
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- **Source data**: The original data used to create the knowledge base.
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Knowledge bases are stored local to your Langflow instance.
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The default storage location depends on your operating system and installation method:
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- **Langflow Desktop**:
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- **macOS**: `/Users/<username>/.langflow/knowledge_bases`
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- **Windows**: `C:\Users\<name>\AppData\Roaming\com.LangflowDesktop\knowledge_bases`
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- **Langflow OSS**:
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- **macOS/Windows/Linux/WSL with `uv pip install`**: `<path_to_venv>/lib/python3.12/site-packages/langflow/knowledge_bases` (Python version can vary. Knowledge bases aren't shared between virtual environments.)
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- **macOS/Windows/Linux/WSL with `git clone`**: `<path_to_clone>/src/backend/base/langflow/knowledge_bases`
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If you set the `LANGFLOW_CONFIG_DIR` environment variable, the `knowledge_bases` subdirectory is created relative to that path.
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To change the default `knowledge_bases` directory path, set the `LANGFLOW_KNOWLEDGE_BASES_DIR` environment variable:
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```bash
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export LANGFLOW_KNOWLEDGE_BASES_DIR="/path/to/parent/directory"
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```
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### Create a knowledge base
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In this example, you'll create a knowledge base of chunked customer orders.
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To follow along with this example, download [`customer-orders.csv`](/files/customer_orders.csv) to your local machine, or adapt the steps for your own structured data.
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1. On the [**Projects** page](/concepts-flows#projects) page, click <Icon name="Library" aria-hidden="true"/>**Knowledge** below the list of projects to view and manage your knowledge bases.
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2. To create a new knowledge base, click <Icon name="Plus" aria-hidden="true"/>**Add Knowledge**.
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3. In the **Create Knowledge Base** pane, enter a name for your knowledge base, and select an embedding model.
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<PartialGlobalModelProviders />
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4. To configure sources for your knowledge base, click **Configure Sources**.
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Optionally, to create an empty knowledge base, click **Create**.
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5. In the **Configure Sources** pane, configure the sources for your knowledge base's data, and also how the embedded data will be chunked for vector search retrieval.
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For this example, click <Icon name="Upload" aria-hidden="true"/>**Add Sources**, and then select the downloaded [`customer-orders.csv`](/files/customer_orders.csv) file from your local machine.
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The default settings for **Chunk Size**, **Chunk Overlap**, and **Separator** are fine.
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To continue, click **Next Step**.
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6. The **Review & Build** pane allows you to preview your first chunk before you commit to spending tokens to embedall of the data into the knowledge base.
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If the chunk isn't what you want to embed, click **Back** to configure your chunking strategy.
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To embed this data, click **Create**.
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7. Your data is embedded as a **Knowledge**.
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When it is available to use, the **Status** changes to **Ready**.
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To use the new knowledge base in a flow, see [Use the Knowledge Base component in a flow](/knowledge-base).
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### Manage knowledge bases
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On the [**Projects** page](/concepts-flows#projects) page, click <Icon name="Library" aria-hidden="true"/>**Knowledge** below the list of projects to view and manage your knowledge bases.
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For each knowledge base, you can see the following information:
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* Name
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* Embedding model
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* Size on disk
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* Number of words, characters, and chunks
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* The average length and size of chunks
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* The knowledge base's status
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Chunking behavior is determined by the embedding model, and the embedding model is set when you create the knowledge base.
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If you need to change the embedding model, you must delete and recreate the knowledge base.
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To update a knowledge base with , click <Icon name="EllipsisVertical" aria-hidden="true"/> **More**, and then select <Icon name="RefreshCW" aria-hidden="true"/> **Update Knowledge Base**.
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To view a knowledge base's chunks, click <Icon name="EllipsisVertical" aria-hidden="true"/> **More**, and then select <Icon name="Layers" aria-hidden="true"/> **View Chunks**.
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To delete a knowledge base, click <Icon name="EllipsisVertical" aria-hidden="true"/> **More**, and then click <Icon name="Trash2" aria-hidden="true"/> **Delete**.
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If any flows use the deleted knowledge base, you must update them to use a different knowledge base.
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For more information on using knowledge bases in a flow, see the [**Knowledge Base** component](/knowledge-base) documentation.
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## See also
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* [Use Langflow agents](/agents)
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* [Language model components](/components-models) |