Harrison/indexing pipeline (#1317)

docs/modules/indexes/chain_examples/question_answering.ipynb

@@ -30,29 +30,24 @@
     "from langchain.text_splitter import CharacterTextSplitter\n",
     "from langchain.vectorstores import Chroma\n",
     "from langchain.docstore.document import Document\n",
-    "from langchain.prompts import PromptTemplate"
+    "from langchain.prompts import PromptTemplate\n",
+    "from langchain.indexes.vectorstore import VectorstoreIndexCreator"
    ]
   },
   {
    "cell_type": "code",
    "execution_count": 2,
-   "id": "291f0117",
+   "id": "ef9305cc",
    "metadata": {},
    "outputs": [],
    "source": [
-    "from langchain.document_loaders import TextLoader\n",
-    "loader = TextLoader('../../state_of_the_union.txt')\n",
-    "documents = loader.load()\n",
-    "text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0)\n",
-    "texts = text_splitter.split_documents(documents)\n",
-    "\n",
-    "embeddings = OpenAIEmbeddings()"
+    "index_creator = VectorstoreIndexCreator()"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
-   "id": "fd9666a9",
+   "execution_count": 3,
+   "id": "291f0117",
    "metadata": {},
    "outputs": [
     {
@@ -65,12 +60,14 @@
     }
    ],
    "source": [
-    "docsearch = Chroma.from_documents(texts, embeddings)"
+    "from langchain.document_loaders import TextLoader\n",
+    "loader = TextLoader('../../state_of_the_union.txt')\n",
+    "docsearch = index_creator.from_loaders([loader])"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 4,
    "id": "d1eaf6e6",
    "metadata": {},
    "outputs": [],