code: def test_completion_together_ai_stream():
      user_message = "Write 1pg about YC & litellm"
      messages = [{"content": user_message, "role": "user"}]
      try:
          response = completion(
              model="together_ai/mistralai/Mistral-7B-Instruct-v0.1",
              messages=messages,
              stream=True,
              max_tokens=5,
          )
          print(response)
          for chunk in response:
              print(chunk)
          # print(string_response)
      except Exception as e:
          pytest.fail(f"Error occurred: {e}")
  
imports: import sys, os
  import traceback
  from dotenv import load_dotenv
  import os, io
  import pytest
  import litellm
  from litellm import embedding, completion, completion_cost, Timeout
  from litellm import RateLimitError
  import openai
label_desc: Use image node_id 57 for calling a global function with example usage: test_completion_together_ai_stream() without return types