langchain/docs/modules/llms/streaming_llm.ipynb

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    "# Streaming with LLMs\n",
    "\n",
    "LangChain provides streaming support for LLMs. Currently, we only support streaming for the `OpenAI` and `ChatOpenAI` LLM implementation, but streaming support for other LLM implementations is on the roadmap. To utilize streaming, use a [`CallbackHandler`](https://github.com/hwchase17/langchain/blob/master/langchain/callbacks/base.py) that implements `on_llm_new_token`. In this example, we are using [`StreamingStdOutCallbackHandler`]()."
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      "\n",
      "\n",
      "Verse 1\n",
      "I'm sippin' on sparkling water,\n",
      "It's so refreshing and light,\n",
      "It's the perfect way to quench my thirst\n",
      "On a hot summer night.\n",
      "\n",
      "Chorus\n",
      "Sparkling water, sparkling water,\n",
      "It's the best way to stay hydrated,\n",
      "It's so crisp and so clean,\n",
      "It's the perfect way to stay refreshed.\n",
      "\n",
      "Verse 2\n",
      "I'm sippin' on sparkling water,\n",
      "It's so bubbly and bright,\n",
      "It's the perfect way to cool me down\n",
      "On a hot summer night.\n",
      "\n",
      "Chorus\n",
      "Sparkling water, sparkling water,\n",
      "It's the best way to stay hydrated,\n",
      "It's so crisp and so clean,\n",
      "It's the perfect way to stay refreshed.\n",
      "\n",
      "Verse 3\n",
      "I'm sippin' on sparkling water,\n",
      "It's so light and so clear,\n",
      "It's the perfect way to keep me cool\n",
      "On a hot summer night.\n",
      "\n",
      "Chorus\n",
      "Sparkling water, sparkling water,\n",
      "It's the best way to stay hydrated,\n",
      "It's so crisp and so clean,\n",
      "It's the perfect way to stay refreshed."
     ]
    }
   ],
   "source": [
    "from langchain.llms import OpenAI\n",
    "from langchain.chat_models import ChatOpenAI\n",
    "from langchain.callbacks.base import CallbackManager\n",
    "from langchain.callbacks.streaming_stdout import StreamingStdOutCallbackHandler\n",
    "from langchain.schema import HumanMessage\n",
    "\n",
    "\n",
    "llm = OpenAI(streaming=True, callback_manager=CallbackManager([StreamingStdOutCallbackHandler()]), verbose=True, temperature=0)\n",
    "resp = llm(\"Write me a song about sparkling water.\")"
   ]
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   "source": [
    "We still have access to the end `LLMResult` if using `generate`. However, `token_usage` is not currently supported for streaming."
   ]
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     "text": [
      "\n",
      "\n",
      "Q: What did the fish say when it hit the wall?\n",
      "A: Dam!"
     ]
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      "text/plain": [
       "LLMResult(generations=[[Generation(text='\\n\\nQ: What did the fish say when it hit the wall?\\nA: Dam!', generation_info={'finish_reason': None, 'logprobs': None})]], llm_output={'token_usage': {}})"
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   "source": [
    "llm.generate([\"Tell me a joke.\"])"
   ]
  },
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   "source": [
    "Here's an example with `ChatOpenAI`:"
   ]
  },
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      "\n",
      "\n",
      "Verse 1:\n",
      "Bubbles rising to the top\n",
      "A refreshing drink that never stops\n",
      "Clear and crisp, it's pure delight\n",
      "A taste that's sure to excite\n",
      "\n",
      "Chorus:\n",
      "Sparkling water, oh so fine\n",
      "A drink that's always on my mind\n",
      "With every sip, I feel alive\n",
      "Sparkling water, you're my vibe\n",
      "\n",
      "Verse 2:\n",
      "No sugar, no calories, just pure bliss\n",
      "A drink that's hard to resist\n",
      "It's the perfect way to quench my thirst\n",
      "A drink that always comes first\n",
      "\n",
      "Chorus:\n",
      "Sparkling water, oh so fine\n",
      "A drink that's always on my mind\n",
      "With every sip, I feel alive\n",
      "Sparkling water, you're my vibe\n",
      "\n",
      "Bridge:\n",
      "From the mountains to the sea\n",
      "Sparkling water, you're the key\n",
      "To a healthy life, a happy soul\n",
      "A drink that makes me feel whole\n",
      "\n",
      "Chorus:\n",
      "Sparkling water, oh so fine\n",
      "A drink that's always on my mind\n",
      "With every sip, I feel alive\n",
      "Sparkling water, you're my vibe\n",
      "\n",
      "Outro:\n",
      "Sparkling water, you're the one\n",
      "A drink that's always so much fun\n",
      "I'll never let you go, my friend\n",
      "Sparkling"
     ]
    }
   ],
   "source": [
    "chat = ChatOpenAI(streaming=True, callback_manager=CallbackManager([StreamingStdOutCallbackHandler()]), verbose=True, temperature=0)\n",
    "resp = chat([HumanMessage(content=\"Write me a song about sparkling water.\")])"
   ]
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