Update openai-python api usage (#1275)

Signed-off-by: lvliang-intel <liang1.lv@intel.com>

intel_extension_for_transformers/neural_chat/README.md

@@ -74,20 +74,27 @@ server_executor(config_file="./server/config/neuralchat.yaml", log_file="./neura
 Once the service is running, you can observe an OpenAI-compatible endpoint `/v1/chat/completions`. You can use any of below ways to access the endpoint.
 
 #### Using OpenAI Client Library
+
+First, install openai-python:
+
+```bash
+pip install --upgrade openai
+```
+
+Then, interact with the model:
+
 ```python
-from openai import Client
-# Replace 'your_api_key' with your actual OpenAI API key
-api_key = 'your_api_key'
-backend_url = 'http://127.0.0.1:80/v1/chat/completions'
-client = Client(api_key=api_key, base_url=backend_url)
-response = client.ChatCompletion.create(
+import openai
+openai.api_key = "EMPTY"
+openai.base_url = 'http://127.0.0.1:80/v1/'
+response = openai.chat.completions.create(
       model="Intel/neural-chat-7b-v3-1",
       messages=[
           {"role": "system", "content": "You are a helpful assistant."},
           {"role": "user", "content": "Tell me about Intel Xeon Scalable Processors."},
       ]
 )
-print(response)
+print(response.choices[0].message.content)
 ```
 
 #### Using Curl

intel_extension_for_transformers/neural_chat/docs/neuralchat_api.md

@@ -52,23 +52,25 @@ First, install openai-python:
 pip install --upgrade openai
 ```
 
+Then, interact with the model:
+
 ```python
 import openai
 # to get proper authentication, make sure to use a valid key that's listed in
 # the --api-keys flag. if no flag value is provided, the `api_key` will be ignored.
 openai.api_key = "EMPTY"
-openai.api_base = "http://localhost:80/v1"
+openai.base_url = "http://localhost:80/v1/"
 
 model = "Intel/neural-chat-7b-v3-1"
 prompt = "Once upon a time"
 
 # create a completion
-completion = openai.Completion.create(model=model, prompt=prompt, max_tokens=64)
+completion = openai.completions.create(model=model, prompt=prompt, max_tokens=64)
 # print the completion
 print(prompt + completion.choices[0].text)
 
 # create a chat completion
-completion = openai.ChatCompletion.create(
+completion = openai.chat.completions.create(
   model=model,
   messages=[{"role": "user", "content": "Tell me about Intel Xeon Scalable Processors."}]
 )