Amazon Bedrock Support Streaming (#10393)

### Description

- Add support for streaming with `Bedrock` LLM and `BedrockChat` Chat
Model.
- Bedrock as of now supports streaming for the `anthropic.claude-*` and
`amazon.titan-*` models only, hence support for those have been built.
- Also increased the default `max_token_to_sample` for Bedrock
`anthropic` model provider to `256` from `50` to keep in line with the
`Anthropic` defaults.
- Added examples for streaming responses to the bedrock example
notebooks.

**_NOTE:_**: This PR fixes the issues mentioned in #9897 and makes that
PR redundant.

docs/extras/integrations/chat/bedrock.ipynb

@@ -22,7 +22,7 @@
         },
         {
             "cell_type": "code",
-            "execution_count": 1,
+            "execution_count": null,
             "id": "d4a7c55d-b235-4ca4-a579-c90cc9570da9",
             "metadata": {
                 "tags": []
@@ -73,13 +73,46 @@
                 "chat(messages)"
             ]
         },
+        {
+            "attachments": {},
+            "cell_type": "markdown",
+            "id": "a4a4f4d4",
+            "metadata": {},
+            "source": [
+                "### For BedrockChat with Streaming"
+            ]
+        },
         {
             "cell_type": "code",
             "execution_count": null,
             "id": "c253883f",
             "metadata": {},
             "outputs": [],
-            "source": []
+            "source": [
+                "from langchain.callbacks.streaming_stdout import StreamingStdOutCallbackHandler\n",
+                "\n",
+                "chat = BedrockChat(\n",
+                "    model_id=\"anthropic.claude-v2\",\n",
+                "    streaming=True,\n",
+                "    callbacks=[StreamingStdOutCallbackHandler()],\n",
+                "    model_kwargs={\"temperature\": 0.1},\n",
+                ")"
+            ]
+        },
+        {
+            "cell_type": "code",
+            "execution_count": null,
+            "id": "d9e52838",
+            "metadata": {},
+            "outputs": [],
+            "source": [
+                "messages = [\n",
+                "    HumanMessage(\n",
+                "        content=\"Translate this sentence from English to French. I love programming.\"\n",
+                "    )\n",
+                "]\n",
+                "chat(messages)"
+            ]
         }
     ],
     "metadata": {
@@ -98,7 +131,7 @@
             "name": "python",
             "nbconvert_exporter": "python",
             "pygments_lexer": "ipython3",
-            "version": "3.11.4"
+            "version": "3.10.9"
         }
     },
     "nbformat": 4,

docs/extras/integrations/llms/bedrock.ipynb

@@ -61,6 +61,46 @@
     "\n",
     "conversation.predict(input=\"Hi there!\")"
    ]
+  },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Conversation Chain With Streaming"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from langchain.llms import Bedrock\n",
+    "from langchain.callbacks.streaming_stdout import StreamingStdOutCallbackHandler\n",
+    "\n",
+    "\n",
+    "llm = Bedrock(\n",
+    "    credentials_profile_name=\"bedrock-admin\",\n",
+    "    model_id=\"amazon.titan-tg1-large\",\n",
+    "    streaming=True,\n",
+    "    callbacks=[StreamingStdOutCallbackHandler()],\n",
+    ")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "\n",
+    "conversation = ConversationChain(\n",
+    "    llm=llm, verbose=True, memory=ConversationBufferMemory()\n",
+    ")\n",
+    "\n",
+    "conversation.predict(input=\"Hi there!\")"
+   ]
   }
  ],
  "metadata": {

docs/package-lock.json

@@ -1,6 +0,0 @@
-{
-  "name": "docs",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {}
-}