Docs refactor (#480)

Big docs refactor! Motivation is to make it easier for people to find
resources they are looking for. To accomplish this, there are now three
main sections:

- Getting Started: steps for getting started, walking through most core
functionality
- Modules: these are different modules of functionality that langchain
provides. Each part here has a "getting started", "how to", "key
concepts" and "reference" section (except in a few select cases where it
didnt easily fit).
- Use Cases: this is to separate use cases (like summarization, question
answering, evaluation, etc) from the modules, and provide a different
entry point to the code base.

There is also a full reference section, as well as extra resources
(glossary, gallery, etc)

Co-authored-by: Shreya Rajpal <ShreyaR@users.noreply.github.com>

docs/modules/llms/examples/llm_serialization.ipynb

@@ -0,0 +1,168 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "73f9bf40",
+   "metadata": {},
+   "source": [
+    "# LLM Serialization\n",
+    "\n",
+    "This notebook walks how to write and read an LLM Configuration to and from disk. This is useful if you want to save the configuration for a given LLM (eg the provider, the temperature, etc)."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "9c9fb6ff",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from langchain.llms import OpenAI\n",
+    "from langchain.llms.loading import load_llm"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "88ce018b",
+   "metadata": {},
+   "source": [
+    "## Loading\n",
+    "First, lets go over loading a LLM from disk. LLMs can be saved on disk in two formats: json or yaml. No matter the extension, they are loaded in the same way."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "f12b28f3",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{\r\n",
+      "    \"model_name\": \"text-davinci-003\",\r\n",
+      "    \"temperature\": 0.7,\r\n",
+      "    \"max_tokens\": 256,\r\n",
+      "    \"top_p\": 1.0,\r\n",
+      "    \"frequency_penalty\": 0.0,\r\n",
+      "    \"presence_penalty\": 0.0,\r\n",
+      "    \"n\": 1,\r\n",
+      "    \"best_of\": 1,\r\n",
+      "    \"request_timeout\": null,\r\n",
+      "    \"_type\": \"openai\"\r\n",
+      "}"
+     ]
+    }
+   ],
+   "source": [
+    "!cat llm.json"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "9ab709fc",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "llm = load_llm(\"llm.json\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "095b1d56",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "_type: openai\r\n",
+      "best_of: 1\r\n",
+      "frequency_penalty: 0.0\r\n",
+      "max_tokens: 256\r\n",
+      "model_name: text-davinci-003\r\n",
+      "n: 1\r\n",
+      "presence_penalty: 0.0\r\n",
+      "request_timeout: null\r\n",
+      "temperature: 0.7\r\n",
+      "top_p: 1.0\r\n"
+     ]
+    }
+   ],
+   "source": [
+    "!cat llm.yaml"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "8cafaafe",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "llm = load_llm(\"llm.yaml\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "ab3e4223",
+   "metadata": {},
+   "source": [
+    "## Saving\n",
+    "If you want to go from a LLM in memory to a serialized version of it, you can do so easily by calling the `.save` method. Again, this supports both json and yaml."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "id": "b38f685d",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "llm.save(\"llm.json\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "id": "b7365503",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "llm.save(\"llm.yaml\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "68e45b1c",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "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": "3.10.9"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}