updated oa_completion and fix import error

lm_eval/models/openai_completions.py

@@ -10,9 +10,6 @@ from lm_eval import utils
 from lm_eval.api.model import LM
 from lm_eval.api.registry import register_model
 
-import asyncio
-from openai import OpenAI, AsyncOpenAI
-
 
 def get_result(response: dict, ctxlen: int) -> Tuple[float, bool]:
     """Process results from OpenAI API response.
@@ -58,7 +55,7 @@ please install these via `pip install lm-eval[openai]` or `pip install -e .[open
     backoff_time = 3
     while True:
         try:
-            return openai.Completion.create(**kwargs)
+            return openai.Completions.create(**kwargs)
         except openai.error.OpenAIError:
             import traceback
 
@@ -344,7 +341,6 @@ please install these via `pip install lm-eval[openai]` or `pip install -e .[open
 
 @register_model("openai-chat-completions")
 class OpenaiChatCompletionsLM(LM):
-
     def __init__(
         self, model: str = "gpt-3.5-turbo", truncate: bool = False, batch_size: int = 1
     ) -> None:
@@ -376,7 +372,7 @@ class OpenaiChatCompletionsLM(LM):
         self.end_of_text_token_id = self.tokenizer.eot_token
 
         # Read from environment variable OPENAI_API_KEY
-        self.client = OpenAI() # AsyncOpenAI()
+        self.client = openai.OpenAI()  # openai.AsyncOpenAI()
 
     @property
     def eot_token_id(self):