Templates (#12294)

Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
Co-authored-by: Lance Martin <lance@langchain.dev>
Co-authored-by: Jacob Lee <jacoblee93@gmail.com>

templates/rag-pinecone/LICENSE

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+MIT License
+
+Copyright (c) 2023 LangChain, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

templates/rag-pinecone/README.md

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+# RAG Pinecone
+
+This template performs RAG using Pinecone and OpenAI.
+
+##  Pinecone
+
+This connects to a hosted Pinecone vectorstore.
+
+Be sure that you have set a few env variables in `chain.py`:
+
+* `PINECONE_API_KEY`
+* `PINECONE_ENV`
+* `index_name`
+
+##  LLM
+
+Be sure that `OPENAI_API_KEY` is set in order to the OpenAI models.
+
+## Installation
+
+Create your LangServe app:
+```
+langchain serve new my-app
+cd my-app
+```
+
+Add template:
+```
+langchain serve add rag-pinecone
+```
+
+Start server:
+```
+langchain start
+```
+
+See Jupyter notebook `rag_pinecone` for various way to connect to the template.

templates/rag-pinecone/pinecone_rag.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "681a5d1e",
+   "metadata": {},
+   "source": [
+    "## Connect to template\n",
+    "\n",
+    "`Context`\n",
+    " \n",
+    "* LangServe apps gives you access to templates.\n",
+    "* Templates LLM pipeline (runnables or chains) end-points accessible via FastAPI.\n",
+    "* The environment for these templates is managed by Poetry.\n",
+    "\n",
+    "`Create app`\n",
+    "\n",
+    "* Install LangServe and create an app.\n",
+    "* This will create a new Poetry environment /\n",
+    "```\n",
+    "pip install < to add > \n",
+    "langchain serve new my-app\n",
+    "cd my-app\n",
+    "```\n",
+    "\n",
+    "`Add templates`\n",
+    "\n",
+    "* When we add a template, we update the Poetry config file with the necessary dependencies.\n",
+    "* It also automatically installed these template dependencies in your Poetry environment\n",
+    "```\n",
+    "langchain serve add rag-pinecone\n",
+    "```\n",
+    "\n",
+    "`Start FastAPI server`\n",
+    "\n",
+    "```\n",
+    "langchain start\n",
+    "```\n",
+    "\n",
+    "Note, we can now look at the endpoints:\n",
+    "\n",
+    "http://127.0.0.1:8000/docs#\n",
+    "\n",
+    "And look specifically at our loaded template:\n",
+    "\n",
+    "http://127.0.0.1:8000/docs#/default/invoke_rag_pinecone_invoke_post\n",
+    " \n",
+    "We can also use remote runnable to call it:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "d774be2a",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from langserve.client import RemoteRunnable\n",
+    "rag_app_pinecone = RemoteRunnable('http://localhost:8000/rag-pinecone')"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.16"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}

templates/rag-pinecone/pyproject.toml

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+[tool.poetry]
+name = "rag-pinecone"
+version = "0.1.0"
+description = ""
+authors = ["Lance Martin <lance@langchain.dev>"]
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = ">=3.8.1,<4.0"
+langchain = ">=0.0.313, <0.1"
+openai = ">=0.28.1"
+tiktoken = ">=0.5.1"
+pinecone-client = ">=2.2.4"
+
+[tool.langserve]
+export_module = "rag_pinecone"
+export_attr = "chain"
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"

templates/rag-pinecone/rag_pinecone/__init__.py

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+from rag_pinecone.chain import chain
+
+__all__ = ["chain"]

templates/rag-pinecone/rag_pinecone/chain.py

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+import os 
+import pinecone
+from operator import itemgetter
+from langchain.vectorstores import Pinecone
+from langchain.prompts import ChatPromptTemplate
+from langchain.chat_models import ChatOpenAI
+from langchain.embeddings import OpenAIEmbeddings
+from langchain.schema.output_parser import StrOutputParser
+from langchain.schema.runnable import RunnablePassthrough, RunnableParallel
+
+# Pinecone init
+# Find API key in console at app.pinecone.io
+YOUR_API_KEY = os.getenv('PINECONE_API_KEY') or 'PINECONE_API_KEY'
+# Find ENV (cloud region) next to API key in console
+YOUR_ENV = os.getenv('PINECONE_ENVIRONMENT') or 'PINECONE_ENV'
+# Init
+pinecone.init(
+    api_key=YOUR_API_KEY,
+    environment=YOUR_ENV
+)
+
+# Get vectorstore
+text_field = "text"
+index_name = "langchain-multi-query-demo"
+index = pinecone.Index(index_name)
+vectorstore = Pinecone(index, 
+                       OpenAIEmbeddings(), 
+                       text_field)
+
+retriever = vectorstore.as_retriever()
+
+# RAG prompt
+template = """Answer the question based only on the following context:
+{context}
+Question: {question}
+"""
+prompt = ChatPromptTemplate.from_template(template)
+
+# RAG
+model = ChatOpenAI()
+chain = (
+    RunnableParallel({"context": retriever, "question": RunnablePassthrough()})
+    | prompt
+    | model
+    | StrOutputParser()
+)