Update FlexRAG retriever

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README.md

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-Test
+---
+language: en
+library_name: FlexRAG
+tags:
+- FlexRAG
+- retrieval
+- search
+- lexical
+- RAG
+---
+
+# FlexRAG Retriever
+
+This is a DenseRetriever created with the [`FlexRAG`](https://github.com/ictnlp/flexrag) library (version `0.1.8`).
+
+FlexRAG Related Links:
+* 📚[Documentation](https://flexrag.readthedocs.io/en/latest/)
+* 💻[GitHub Repository](https://github.com/ictnlp/flexrag)
+
+## Installation
+
+You can install the `FlexRAG` library with `pip`:
+
+```bash
+pip install flexrag
+```
+
+## Loading a `FlexRAG` retriever
+
+You can use this retriever for information retrieval tasks. Here is an example:
+
+```python
+from flexrag.retriever import LocalRetriever
+
+# Load the retriever from the HuggingFace Hub
+retriever = LocalRetriever.load_from_hub("zhuocheng/toycorp-all-MiniLM-L6-v2")
+
+# You can retrieve now
+results = retriever.search("Who is Bruce Wayne?")
+```

database.lance/data/ef7f500e-6eb8-492a-874d-fec43c9367d0.lance

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