Adding LangChain v0.2 support for nvidia ai endpoint, langchain-nvidia-ai-endpoints. Removed deprecated classes from nvidia_ai_endpoints.ipynb (#24411)

Description: added support for LangChain v0.2 for nvidia ai endpoint.
Implremented inMemory storage for chains using
RunnableWithMessageHistory which is analogous to using
`ConversationChain` which was used in v0.1 with the default
`ConversationBufferMemory`. This class is deprecated in favor of
`RunnableWithMessageHistory` in LangChain v0.2

Issue: None

Dependencies: None.

---------

Co-authored-by: Chester Curme <chester.curme@gmail.com>

docs/docs/integrations/chat/nvidia_ai_endpoints.ipynb

@@ -540,7 +540,7 @@
     "id": "137662a6"
    },
    "source": [
-    "## Example usage within a Conversation Chains"
+    "## Example usage within RunnableWithMessageHistory "
    ]
   },
   {
@@ -550,7 +550,7 @@
     "id": "79efa62d"
    },
    "source": [
-    "Like any other integration, ChatNVIDIA is fine to support chat utilities like conversation buffers by default. Below, we show the [LangChain ConversationBufferMemory](https://python.langchain.com/docs/modules/memory/types/buffer) example applied to the `mistralai/mixtral-8x22b-instruct-v0.1` model."
+    "Like any other integration, ChatNVIDIA is fine to support chat utilities like RunnableWithMessageHistory which is analogous to using `ConversationChain`. Below, we show the [LangChain RunnableWithMessageHistory](https://api.python.langchain.com/en/latest/runnables/langchain_core.runnables.history.RunnableWithMessageHistory.html) example applied to the `mistralai/mixtral-8x22b-instruct-v0.1` model."
    ]
   },
   {
@@ -572,8 +572,19 @@
    },
    "outputs": [],
    "source": [
-    "from langchain.chains import ConversationChain\n",
-    "from langchain.memory import ConversationBufferMemory\n",
+    "from langchain_core.chat_history import InMemoryChatMessageHistory\n",
+    "from langchain_core.runnables.history import RunnableWithMessageHistory\n",
+    "\n",
+    "# store is a dictionary that maps session IDs to their corresponding chat histories.\n",
+    "store = {}  # memory is maintained outside the chain\n",
+    "\n",
+    "\n",
+    "# A function that returns the chat history for a given session ID.\n",
+    "def get_session_history(session_id: str) -> InMemoryChatMessageHistory:\n",
+    "    if session_id not in store:\n",
+    "        store[session_id] = InMemoryChatMessageHistory()\n",
+    "    return store[session_id]\n",
+    "\n",
     "\n",
     "chat = ChatNVIDIA(\n",
     "    model=\"mistralai/mixtral-8x22b-instruct-v0.1\",\n",
@@ -582,24 +593,18 @@
     "    top_p=1.0,\n",
     ")\n",
     "\n",
-    "conversation = ConversationChain(llm=chat, memory=ConversationBufferMemory())"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "f644ff28",
-   "metadata": {
-    "colab": {
-     "base_uri": "https://localhost:8080/",
-     "height": 268
-    },
-    "id": "f644ff28",
-    "outputId": "bae354cc-2118-4e01-ce20-a717ac94d27d"
-   },
-   "outputs": [],
-   "source": [
-    "conversation.invoke(\"Hi there!\")[\"response\"]"
+    "#  Define a RunnableConfig object, with a `configurable` key. session_id determines thread\n",
+    "config = {\"configurable\": {\"session_id\": \"1\"}}\n",
+    "\n",
+    "conversation = RunnableWithMessageHistory(\n",
+    "    chat,\n",
+    "    get_session_history,\n",
+    ")\n",
+    "\n",
+    "conversation.invoke(\n",
+    "    \"Hi I'm Srijan Dubey.\",  # input or query\n",
+    "    config=config,\n",
+    ")"
    ]
   },
   {
@@ -616,26 +621,30 @@
    },
    "outputs": [],
    "source": [
-    "conversation.invoke(\"I'm doing well! Just having a conversation with an AI.\")[\n",
-    "    \"response\"\n",
-    "]"
+    "conversation.invoke(\n",
+    "    \"I'm doing well! Just having a conversation with an AI.\",\n",
+    "    config=config,\n",
+    ")"
    ]
   },
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "LyD1xVKmVSs4",
+   "id": "uHIMZxVSVNBC",
    "metadata": {
     "colab": {
      "base_uri": "https://localhost:8080/",
-     "height": 350
+     "height": 284
     },
-    "id": "LyD1xVKmVSs4",
-    "outputId": "a1714513-a8fd-4d14-f974-233e39d5c4f5"
+    "id": "uHIMZxVSVNBC",
+    "outputId": "79acc89d-a820-4f2c-bac2-afe99da95580"
    },
    "outputs": [],
    "source": [
-    "conversation.invoke(\"Tell me about yourself.\")[\"response\"]"
+    "conversation.invoke(\n",
+    "    \"Tell me about yourself.\",\n",
+    "    config=config,\n",
+    ")"
    ]
   }
  ],