tfidf retriever (#5114)

Co-authored-by: vempaliakhil96 <vempaliakhil96@gmail.com>

docs/modules/indexes/retrievers/examples/tf_idf.ipynb

@@ -16,17 +16,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "id": "a801b57c",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# !pip install scikit-learn"
+    "# !pip install scikit-learn\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "id": "393ac030",
    "metadata": {
     "tags": []
@@ -46,7 +46,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 3,
    "id": "98b1c017",
    "metadata": {
     "tags": []
@@ -56,6 +56,27 @@
     "retriever = TFIDFRetriever.from_texts([\"foo\", \"bar\", \"world\", \"hello\", \"foo bar\"])"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "c016b266",
+   "metadata": {},
+   "source": [
+    "## Create a New Retriever with Documents\n",
+    "\n",
+    "You can now create a new retriever with the documents you created."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "53af4f00",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from langchain.schema import Document\n",
+    "retriever = TFIDFRetriever.from_documents([Document(page_content=\"foo\"), Document(page_content=\"bar\"), Document(page_content=\"world\"), Document(page_content=\"hello\"), Document(page_content=\"foo bar\")])"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "08437fa2",
@@ -68,7 +89,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 6,
    "id": "c0455218",
    "metadata": {
     "tags": []
@@ -80,7 +101,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 7,
    "id": "7dfa5c29",
    "metadata": {
     "tags": []
@@ -95,7 +116,7 @@
        " Document(page_content='world', metadata={})]"
       ]
      },
-     "execution_count": 6,
+     "execution_count": 7,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -103,14 +124,6 @@
    "source": [
     "result"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "74bd9256",
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {
@@ -129,7 +142,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.6"
+   "version": "3.11.3"
   }
  },
  "nbformat": 4,