community[patch]: deprecate ErnieBotChat and ErnieEmbeddings classes (#15862)

- **Description:** add deprecated warning for ErnieBotChat and
ErnieEmbeddings.
- These two classes **lack maintenance** and do not use the sdk provided
by qianfan, which means hard to implement some key feature like
streaming.
- The alternative `langchain_community.chat_models.QianfanChatEndpoint`
and `langchain_community.embeddings.QianfanEmbeddingsEndpoint` can
completely replace these two classes, only need to change configuration
items.
  - **Issue:** None,
  - **Dependencies:** None,
  - **Twitter handle:** None

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

docs/docs/integrations/chat/ernie.ipynb

@@ -16,29 +16,58 @@
     "# ErnieBotChat\n",
     "\n",
     "[ERNIE-Bot](https://cloud.baidu.com/doc/WENXINWORKSHOP/s/jlil56u11) is a large language model developed by Baidu, covering a huge amount of Chinese data.\n",
-    "This notebook covers how to get started with ErnieBot chat models.\n",
+    "This notebook covers how to get started with ErnieBot chat models."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**Deprecated Warning**\n",
+    "\n",
+    "We recommend users using `langchain_community.chat_models.ErnieBotChat` \n",
+    "to use `langchain_community.chat_models.QianfanChatEndpoint` instead.\n",
+    "\n",
+    "documentation for `QianfanChatEndpoint` is [here](./baidu_qianfan_endpoint).\n",
+    "\n",
+    "they are 4 why we recommend users to use `QianfanChatEndpoint`:\n",
     "\n",
-    "**Note:** We recommend users using this class to switch to [Baidu Qianfan](./baidu_qianfan_endpoint). they are 3 why we recommend users to use `QianfanChatEndpoint`:\n",
     "1. `QianfanChatEndpoint` support more LLM in the Qianfan platform.\n",
     "2. `QianfanChatEndpoint` support streaming mode.\n",
     "3. `QianfanChatEndpoint` support function calling usgage.\n",
-    "\n",
+    "4. `ErnieBotChat` is lack of maintenance and deprecated."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
     "Some tips for migration:\n",
+    "\n",
     "- change `ernie_client_id` to `qianfan_ak`, also change `ernie_client_secret` to `qianfan_sk`.\n",
-    "- install `qianfan` package. \n",
-    "    ```\n",
-    "    pip install qianfan\n",
-    "    ```"
+    "- install `qianfan` package. like `pip install qianfan`\n",
+    "- change `ErnieBotChat` to `QianfanChatEndpoint`."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
-    "from langchain.schema import HumanMessage\n",
-    "from langchain_community.chat_models import ErnieBotChat"
+    "from langchain_community.chat_models.baidu_qianfan_endpoint import QianfanChatEndpoint\n",
+    "\n",
+    "chat = QianfanChatEndpoint(\n",
+    "    qianfan_ak=\"your qianfan ak\",\n",
+    "    qianfan_sk=\"your qianfan sk\",\n",
+    ")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Usage"
    ]
   },
   {
@@ -47,6 +76,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "from langchain.schema import HumanMessage\n",
+    "from langchain_community.chat_models import ErnieBotChat\n",
+    "\n",
     "chat = ErnieBotChat(\n",
     "    ernie_client_id=\"YOUR_CLIENT_ID\", ernie_client_secret=\"YOUR_CLIENT_SECRET\"\n",
     ")"

docs/docs/integrations/text_embedding/ernie.ipynb

@@ -10,6 +10,51 @@
     "which converts text into a vector form represented by numerical values, and is used in text retrieval, information recommendation, knowledge mining and other scenarios."
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**Deprecated Warning**\n",
+    "\n",
+    "We recommend users using `langchain_community.embeddings.ErnieEmbeddings` \n",
+    "to use `langchain_community.embeddings.QianfanEmbeddingsEndpoint` instead.\n",
+    "\n",
+    "documentation for `QianfanEmbeddingsEndpoint` is [here](./baidu_qianfan_endpoint).\n",
+    "\n",
+    "they are 2 why we recommend users to use `QianfanEmbeddingsEndpoint`:\n",
+    "\n",
+    "1. `QianfanEmbeddingsEndpoint` support more embedding model in the Qianfan platform.\n",
+    "2. `ErnieEmbeddings` is lack of maintenance and deprecated."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Some tips for migration:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from langchain_community.embeddings import QianfanEmbeddingsEndpoint\n",
+    "\n",
+    "embeddings = QianfanEmbeddingsEndpoint(\n",
+    "    qianfan_ak=\"your qianfan ak\",\n",
+    "    qianfan_sk=\"your qianfan sk\",\n",
+    ")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Usage"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,