Platform For AI:LLM Deployment

Background information

The application of LLMs, such as the Generative Pre-trained Transformer (GPT) and TongYi Qianwen (Qwen) series of models, has garnered significant attention, especially in inference tasks. EAS allows you to easily deploy open source LLMs as an inference service. Supported LLMs include Llama 3, Qwen, Llama 2, ChatGLM, Baichuan, Yi-6B, Mistral-7B, and Falcon-7B. You can not only call the models by using WebUI or API, but also use the LangChain framework to generate custom response based on your business data.

• What is LangChain:

  LangChain is an open source framework that allows AI developers to integrate LLMs like GPT-4 with external data to improve performance and optimize resource utilization.

• How does LangChain work:

  LangChain splits the source data (such as a 20-page PDF file) into smaller chunks, converts the chunks into numerical vectors by using embedding models (such as BGE and text2vec), and then stores the vectors in a vector database.

  This way, the LLM can use the data in the vector database to generate responses. For each user query, LangChain retrieves the chunk that is relevant to the user query from the vector database, includes the retrieved information and the query in a prompt, and then sends the prompt to the LLM to generate an answer.

Prerequisites

If you want to deploy a custom model, make sure the following prerequisites are met:

• Model files and related configuration files are prepared. The following figure is a sample of model files.

  The config.json file must be included in the configuration files. You must configure the config.json file based on the Huggingface model format. For more information about the sample file, see config.json.

• An Object Storage Service (OSS) bucket or a NAS file system is created to store the model files. You can also register the model files as AI assets of PAI for easier management and maintenance. For more information about how to create an OSS bucket, see Get started by using the OSS console.

• The model files and configuration files are uploaded to the OSS bucket. For more information, see Get started by using the OSS console.

Limits

• The inference acceleration engines provided by EAS support only the following models: Qwen2-7b, Qwen1.5-1.8b, Qwen1.5-7b, Qwen1.5-14b, llama3-8b, llama2-7b, llama2-13b, chatglm3-6b, baichuan2-7b, baichuan2-13b, falcon-7b, yi-6b, mistral-7b-instruct-v0.2, gemma-2b-it, gemma-7b-it, deepseek-coder-7b-instruct-v1.5.

• The LangChain framework is not supported by the inference acceleration engines.

Deploy an LLM in EAS

The following deployment methods are supported:

Call an EAS service

Call EAS services by using the web UI

1. Find the deployed service and click View Web App in the Service Type column.

2. Test the inference performance on the WebUI page.

   Enter a sentence in the input text box and click Send to start a conversation. Sample input: Provide a learning plan for personal finance.

3. Use the LangChain framework to integrate your own business data into the service and generate customized answers based on your local knowledge base.

   1. On the WebUI page of the service that you deployed, click the LangChain tab.

   2. In the lower-left corner of the ChatLLM-LangChain-WebUI page, follow the on-screen instructions to upload a knowledge base. You can upload files in the following formats: TXT, Markdown, DOCX, and PDF.

      For example, you can upload a README.md file and click Vectorstore knowledge. The following result indicates that the data in the file is loaded.

   3. Enter a question about the data you uploaded in the input text box and click Send to start a conversation.

      Sample input: How to install deepspeed.

Call EAS services by using API operations

1. Obtain the service endpoint and token.

   1. Go to the Elastic Algorithm Service (EAS) page. For more information, see the Deploy an LLM in EAS section of this topic.

   2. Click the name of the service to go to the Service Details tab.

   3. In the Basic Information section, click Invocation Method. On the Public Endpoint tab of the dialogue box that appears, obtain the token and endpoint.

2. To call API operations to perform inference, use one of the following methods:

   Use HTTP

   • Non-streaming mode

     The client sends the following types of standard HTTP requests when cURL commands are run.

     • STRING requests

       curl $host -H 'Authorization: $authorization' --data-binary @chatllm_data.txt -v

       Replace $authorization with the token. Replace $host with the endpoint. The chatllm_data.txt file is a plain text file that contains the prompt.

     • Structured requests

       curl $host -H 'Authorization: $authorization' -H "Content-type: application/json" --data-binary @chatllm_data.json -v -H "Connection: close"

       Use the chatllm_data.json file to configure inference parameters. The following sample code provides an format example of the chatllm_data.json file:

       {
         "max_new_tokens": 4096,
         "use_stream_chat": false,
         "prompt": "How to install it?",
         "system_prompt": "Act like you are programmer with 5+ years of experience.",
         "history": [
           [
             "Can you tell me what's the bladellm?",
             "BladeLLM is an framework for LLM serving, integrated with acceleration techniques like quantization, ai compilation, etc. , and supporting popular LLMs like OPT, Bloom, LLaMA, etc."
           ]
         ],
         "temperature": 0.8,
         "top_k": 10,
         "top_p": 0.8,
         "do_sample": true,
         "use_cache": true
       }

       The following table describes the parameters in the preceding code. Configure the parameters based on your business requirements.

       Parameter	Description	Default value
       max_new_tokens	The maximum number of output tokens.	2048
       use_stream_chat	Specifies whether to return the output tokens in the streaming mode.	true
       prompt	The user prompt.	""
       system_prompt	The system prompt.	""
       history	The dialogue history. The value is in the List[Tuple(str, str)] format.	[()]
       temperature	The randomness of the model output. A larger value specifies a higher randomness. A value of 0 specifies a fixed output. The value is of the Float type and ranges from 0 to 1.	0.95
       top_k	The number of outputs selected from the generated results.	30
       top_p	The probability threshold of outputs selected from the generated results. The value is of the Float type and ranges from 0 to 1.	0.8
       do_sample	Specifies whether to enable output sampling.	true
       use_cache	Specifies whether to enable KV cache.	true

     You can also implement your own client based on the Python requests package. Example:

     import argparse
     import json
     from typing import Iterable, List
     
     import requests
     
     def post_http_request(prompt: str,
                           system_prompt: str,
                           history: list,
                           host: str,
                           authorization: str,
                           max_new_tokens: int = 2048,
                           temperature: float = 0.95,
                           top_k: int = 1,
                           top_p: float = 0.8,
                           langchain: bool = False,
                           use_stream_chat: bool = False) -> requests.Response:
         headers = {
             "User-Agent": "Test Client",
             "Authorization": f"{authorization}"
         }
         if not history:
             history = [
                 (
                     "San Francisco is a",
                     "city located in the state of California in the United States. \
                     It is known for its iconic landmarks, such as the Golden Gate Bridge \
                     and Alcatraz Island, as well as its vibrant culture, diverse population, \
                     and tech industry. The city is also home to many famous companies and \
                     startups, including Google, Apple, and Twitter."
                 )
             ]
         pload = {
             "prompt": prompt,
             "system_prompt": system_prompt,
             "top_k": top_k,
             "top_p": top_p,
             "temperature": temperature,
             "max_new_tokens": max_new_tokens,
             "use_stream_chat": use_stream_chat,
             "history": history
         }
         if langchain:
             pload["langchain"] = langchain
         response = requests.post(host, headers=headers,
                                  json=pload, stream=use_stream_chat)
         return response
     
     def get_response(response: requests.Response) -> List[str]:
         data = json.loads(response.content)
         output = data["response"]
         history = data["history"]
         return output, history
     
     if __name__ == "__main__":
         parser = argparse.ArgumentParser()
         parser.add_argument("--top-k", type=int, default=4)
         parser.add_argument("--top-p", type=float, default=0.8)
         parser.add_argument("--max-new-tokens", type=int, default=2048)
         parser.add_argument("--temperature", type=float, default=0.95)
         parser.add_argument("--prompt", type=str, default="How can I get there?")
         parser.add_argument("--langchain", action="store_true")
     
         args = parser.parse_args()
     
         prompt = args.prompt
         top_k = args.top_k
         top_p = args.top_p
         use_stream_chat = False
         temperature = args.temperature
         langchain = args.langchain
         max_new_tokens = args.max_new_tokens
     
         host = "<EAS service public endpoint>"
         authorization = "<EAS service public token>"
     
         print(f"Prompt: {prompt!r}\n", flush=True)
         # System prompts can be included in the requests. 
         system_prompt = "Act like you are programmer with \
                     5+ years of experience."
     
         # Dialogue history can be included in the requests. The client manages the history to implement multi-round dialogues. In most cases, the information from the previous round of dialogue is used. The information is in the List[Tuple(str, str)] format. 
         history = []
         response = post_http_request(
             prompt, system_prompt, history,
             host, authorization,
             max_new_tokens, temperature, top_k, top_p,
             langchain=langchain, use_stream_chat=use_stream_chat)
         output, history = get_response(response)
         print(f" --- output: {output} \n --- history: {history}", flush=True)
     
     # The server returns a JSON response that includes the inference result and dialogue history. 
     def get_response(response: requests.Response) -> List[str]:
         data = json.loads(response.content)
         output = data["response"]
         history = data["history"]
         return output, history

     Take note of the following parameters:

     • Set the host parameter to the service endpoint

     • Set the authorization parameter to the service token.

   • Streaming mode

     In streaming mode, the HTTP SSE method is used. Sample code:

     import argparse
     import json
     from typing import Iterable, List
     
     import requests
     
     
     def clear_line(n: int = 1) -> None:
         LINE_UP = '\033[1A'
         LINE_CLEAR = '\x1b[2K'
         for _ in range(n):
             print(LINE_UP, end=LINE_CLEAR, flush=True)
     
     
     def post_http_request(prompt: str,
                           system_prompt: str,
                           history: list,
                           host: str,
                           authorization: str,
                           max_new_tokens: int = 2048,
                           temperature: float = 0.95,
                           top_k: int = 1,
                           top_p: float = 0.8,
                           langchain: bool = False,
                           use_stream_chat: bool = False) -> requests.Response:
         headers = {
             "User-Agent": "Test Client",
             "Authorization": f"{authorization}"
         }
         if not history:
             history = [
                 (
                     "San Francisco is a",
                     "city located in the state of California in the United States. \
                     It is known for its iconic landmarks, such as the Golden Gate Bridge \
                     and Alcatraz Island, as well as its vibrant culture, diverse population, \
                     and tech industry. The city is also home to many famous companies and \
                     startups, including Google, Apple, and Twitter."
                 )
             ]
         pload = {
             "prompt": prompt,
             "system_prompt": system_prompt,
             "top_k": top_k,
             "top_p": top_p,
             "temperature": temperature,
             "max_new_tokens": max_new_tokens,
             "use_stream_chat": use_stream_chat,
             "history": history
         }
         if langchain:
             pload["langchain"] = langchain
         response = requests.post(host, headers=headers,
                                  json=pload, stream=use_stream_chat)
         return response
     
     
     def get_streaming_response(response: requests.Response) -> Iterable[List[str]]:
         for chunk in response.iter_lines(chunk_size=8192,
                                          decode_unicode=False,
                                          delimiter=b"\0"):
             if chunk:
                 data = json.loads(chunk.decode("utf-8"))
                 output = data["response"]
                 history = data["history"]
                 yield output, history
     
     
     if __name__ == "__main__":
         parser = argparse.ArgumentParser()
         parser.add_argument("--top-k", type=int, default=4)
         parser.add_argument("--top-p", type=float, default=0.8)
         parser.add_argument("--max-new-tokens", type=int, default=2048)
         parser.add_argument("--temperature", type=float, default=0.95)
         parser.add_argument("--prompt", type=str, default="How can I get there?")
         parser.add_argument("--langchain", action="store_true")
         args = parser.parse_args()
     
         prompt = args.prompt
         top_k = args.top_k
         top_p = args.top_p
         use_stream_chat = True
         temperature = args.temperature
         langchain = args.langchain
         max_new_tokens = args.max_new_tokens
     
         host = ""
         authorization = ""
     
         print(f"Prompt: {prompt!r}\n", flush=True)
         system_prompt = "Act like you are programmer with \
                     5+ years of experience."
         history = []
         response = post_http_request(
             prompt, system_prompt, history,
             host, authorization,
             max_new_tokens, temperature, top_k, top_p,
             langchain=langchain, use_stream_chat=use_stream_chat)
     
         for h, history in get_streaming_response(response):
             print(
                 f" --- stream line: {h} \n --- history: {history}", flush=True)
     

     Take note of the following parameters:

     • Set the host parameter to the service endpoint

     • Set the authorization parameter to the service token.

   Use WebSocket

   The WebSocket protocol can efficiently handle the dialogue history. You can use the WebSocket method to connect to the service and perform one or more rounds of dialogue. Sample code:

   import os
   import time
   import json
   import struct
   from multiprocessing import Process
   
   import websocket
   
   round = 5
   questions = 0
   
   
   def on_message_1(ws, message):
       if message == "<EOS>":
           print('pid-{} timestamp-({}) receives end message: {}'.format(os.getpid(),
                 time.time(), message), flush=True)
           ws.send(struct.pack('!H', 1000), websocket.ABNF.OPCODE_CLOSE)
       else:
           print("{}".format(time.time()))
           print('pid-{} timestamp-({}) --- message received: {}'.format(os.getpid(),
                 time.time(), message), flush=True)
   
   
   def on_message_2(ws, message):
       global questions
       print('pid-{} --- message received: {}'.format(os.getpid(), message))
       # end the client-side streaming
       if message == "<EOS>":
           questions = questions + 1
           if questions == 5:
               ws.send(struct.pack('!H', 1000), websocket.ABNF.OPCODE_CLOSE)
   
   
   def on_message_3(ws, message):
       print('pid-{} --- message received: {}'.format(os.getpid(), message))
       # end the client-side streaming
       ws.send(struct.pack('!H', 1000), websocket.ABNF.OPCODE_CLOSE)
   
   
   def on_error(ws, error):
       print('error happened: ', str(error))
   
   
   def on_close(ws, a, b):
       print("### closed ###", a, b)
   
   
   def on_pong(ws, pong):
       print('pong:', pong)
   
   # stream chat validation test
   def on_open_1(ws):
       print('Opening Websocket connection to the server ... ')
       params_dict = {}
       params_dict['prompt'] = """Show me a golang code example: """
       params_dict['temperature'] = 0.9
       params_dict['top_p'] = 0.1
       params_dict['top_k'] = 30
       params_dict['max_new_tokens'] = 2048
       params_dict['do_sample'] = True
       raw_req = json.dumps(params_dict, ensure_ascii=False).encode('utf8')
       # raw_req = f"""To open a Websocket connection to the server: """
   
       ws.send(raw_req)
       # end the client-side streaming
   
   
   # multi-round query validation test
   def on_open_2(ws):
       global round
       print('Opening Websocket connection to the server ... ')
       params_dict = {"max_new_tokens": 6144}
       params_dict['temperature'] = 0.9
       params_dict['top_p'] = 0.1
       params_dict['top_k'] = 30
       params_dict['use_stream_chat'] = True
       params_dict['prompt'] = "Hello! "
       params_dict = {
           "system_prompt":
           "Act like you are programmer with 5+ years of experience."
       }
       raw_req = json.dumps(params_dict, ensure_ascii=False).encode('utf8')
       ws.send(raw_req)
       params_dict['prompt'] = "Please write a sorting algorithm in Python."
       raw_req = json.dumps(params_dict, ensure_ascii=False).encode('utf8')
       ws.send(raw_req)
       params_dict['prompt'] = "Please convert the programming language to Java."
       raw_req = json.dumps(params_dict, ensure_ascii=False).encode('utf8')
       ws.send(raw_req)
       params_dict['prompt'] = "Please introduce yourself."
       raw_req = json.dumps(params_dict, ensure_ascii=False).encode('utf8')
       ws.send(raw_req)
       params_dict['prompt'] = "Please summarize the dialogue above."
       raw_req = json.dumps(params_dict, ensure_ascii=False).encode('utf8')
       ws.send(raw_req)
   
   
   # Langchain validation test.
   def on_open_3(ws):
       global round
       print('Opening Websocket connection to the server ... ')
   
       params_dict = {}
       # params_dict['prompt'] = """To open a Websocket connection to the server: """
       params_dict['prompt'] = """Can you tell me what's the MNN?"""
       params_dict['temperature'] = 0.9
       params_dict['top_p'] = 0.1
       params_dict['top_k'] = 30
       params_dict['max_new_tokens'] = 2048
       params_dict['use_stream_chat'] = False
       params_dict['langchain'] = True
       raw_req = json.dumps(params_dict, ensure_ascii=False).encode('utf8')
       ws.send(raw_req)
   
   
   authorization = ""
   host = "ws://" + ""
   
   
   def single_call(on_open_func, on_message_func, on_clonse_func=on_close):
       ws = websocket.WebSocketApp(
           host,
           on_open=on_open_func,
           on_message=on_message_func,
           on_error=on_error,
           on_pong=on_pong,
           on_close=on_clonse_func,
           header=[
               'Authorization: ' + authorization],
       )
   
       # setup ping interval to keep long connection.
       ws.run_forever(ping_interval=2)
   
   
   if __name__ == "__main__":
       for i in range(5):
           p1 = Process(target=single_call, args=(on_open_1, on_message_1))
           p2 = Process(target=single_call, args=(on_open_2, on_message_2))
           p3 = Process(target=single_call, args=(on_open_3, on_message_3))
   
           p1.start()
           p2.start()
           p3.start()
   
           p1.join()
           p2.join()
           p3.join()

   Take note of the following parameters:

   • Set the authorization parameter to the service token.

   • Set the host parameter to the service endpoint Replace the http prefix in the endpoint with ws.

   • Use the use_stream_chat parameter to specify whether the client generates output in streaming mode. Default value: True.

   • Refer to the on_open_2 function in the preceding code to implement a multi-round dialogue.

FAQ

How do I switch to another open source LLM?

Perform the following steps:

1. On the Elastic Algorithm Service (EAS) page, find the service that you want to update and click Update in the Actions column.

2. Switch to another open source LLM.

   • Scenario-based Model Deployment

     On the LLM Deployment page, set Model Type to the desired LLM and click Update.

   • Custom Model Deployment

     On the Deploy Service page, modify the Command and Deployment Resources parameters and then click Update. The following table describes the parameter configurations for different models.

     Name	Command	Recommended specification
     Qwen2-7b	python webui/webui_server.py --port=8000 --model-path=Qwen/Qwen2-7B-Instruct	1 × GU30 1 × NVIDIA A10 1 × NVIDIA V100 (32 GB)
     Qwen2-72b	python webui/webui_server.py --port=8000 --model-path=Qwen/Qwen2-72B-Instruct	2 × NVIDIA A100 (80 GB) 4 × NVIDIA A100 (40 GB) 8 × NVIDIA V100 (32 GB)
     Qwen2-57b-A14b	python webui/webui_server.py --port=8000 --model-path=Qwen/Qwen2-57B-A14B-Instruct	2 × NVIDIA A100 (80 GB) 4 × NVIDIA A100 (40 GB) 4 × NVIDIA V100 (32 GB)
     Qwen1.5-1.8b	python webui/webui_server.py --port=8000 --model-path=Qwen/Qwen1.5-1.8B-Chat	1 × NVIDIA T4 1 × NVIDIA V100 (16 GB) 1 × GU30 1 × NVIDIA A10
     Qwen1.5-7b	python webui/webui_server.py --port=8000 --model-path=Qwen/Qwen1.5-7B-Chat	1 × GU30 1 × NVIDIA A10
     Qwen1.5-14b	python webui/webui_server.py --port=8000 --model-path=Qwen/Qwen1.5-14B-Chat	1 × NVIDIA V100 (32 GB) 1 × NVIDIA A100 (40 GB) 1 × NVIDIA A100 (80 GB) 2 × GU30 2 × NVIDIA A10
     Qwen1.5-32b	python webui/webui_server.py --port=8000 --model-path=Qwen/Qwen1.5-32B-Chat	1 × NVIDIA A100 (80 GB) 4 × NVIDIA V100 (32 GB)
     Qwen1.5-72b	python webui/webui_server.py --port=8000 --model-path=Qwen/Qwen1.5-72B-Chat	8 × NVIDIA V100 (32 GB) 2 × NVIDIA A100 (80 GB) 4 × NVIDIA A100 (40 GB)
     Qwen1.5-110b	python webui/webui_server.py --port=8000 --model-path=Qwen/Qwen1.5-110B-Chat	8 × NVIDIA A100 (40 GB) 4 × NVIDIA A100 (80 GB)
     llama3-8b	python webui/webui_server.py --port=8000 --model-path=/huggingface/meta-Llama-3-8B-Instruct/ --model-type=llama3	1 × GU30 1 × NVIDIA A10 1 × NVIDIA V100 (32 GB)
     llama3-70b	python webui/webui_server.py --port=8000 --model-path=/huggingface/meta-Llama-3-70B-Instruct/ --model-type=llama3	2 × NVIDIA A100 (80 GB) 4 × NVIDIA A100 (40 GB) 8 × NVIDIA V100 (32 GB)
     Llama2-7b	python webui/webui_server.py --port=8000 --model-path=meta-llama/Llama-2-7b-chat-hf	1 × GU30 1 × NVIDIA A10 1 × NVIDIA V100 (32 GB)
     Llama2-13b	python webui/webui_server.py --port=8000 --model-path=meta-llama/Llama-2-13b-chat-hf	1 × NVIDIA V100 (32 GB) 2 × GU30 2 × NVIDIA A10
     llama2-70b	python webui/webui_server.py --port=8000 --model-path=meta-llama/Llama-2-70b-chat-hf	8 × NVIDIA V100 (32 GB) 2 × NVIDIA A100 (80 GB) 4 × NVIDIA A100 (40 GB)
     chatglm3-6b	python webui/webui_server.py --port=8000 --model-path=THUDM/chatglm3-6b	1 × GU30 1 × NVIDIA A10 1 × NVIDIA V100 (16 GB) 1 × NVIDIA V100 (32 GB)
     baichuan2-7b	python webui/webui_server.py --port=8000 --model-path=baichuan-inc/Baichuan2-7B-Chat	1 × GU30 1 × NVIDIA A10 1 × NVIDIA V100 (32 GB)
     baichuan2-13b	python webui/webui_server.py --port=8000 --model-path=baichuan-inc/Baichuan2-13B-Chat	2 × GU30 2 × NVIDIA A10 1 × NVIDIA V100 (32 GB)
     falcon-7b	python webui/webui_server.py --port=8000 --model-path=tiiuae/falcon-7b-instruct	1 × GU30 1 × NVIDIA A10 1 × NVIDIA V100 (32 GB)
     falcon-40b	python webui/webui_server.py --port=8000 --model-path=tiiuae/falcon-40b-instruct	8 × NVIDIA V100 (32 GB) 2 × NVIDIA A100 (80 GB) 4 × NVIDIA A100 (40 GB)
     falcon-180b	python webui/webui_server.py --port=8000 --model-path=tiiuae/falcon-180B-chat	8 × NVIDIA A100 (80 GB)
     Yi-6b	python webui/webui_server.py --port=8000 --model-path=01-ai/Yi-6B-Chat	1 × GU30 1 × NVIDIA A10 1 × NVIDIA V100 (16 GB) 1 × NVIDIA V100 (32 GB)
     Yi-34b	python webui/webui_server.py --port=8000 --model-path=01-ai/Yi-34B-Chat	4 × NVIDIA V100 (16 GB) 1 × NVIDIA A100 (80 GB) 4 × NVIDIA A10
     mistral-7b-instruct-v0.2	python webui/webui_server.py --port=8000 --model-path=mistralai/Mistral-7B-Instruct-v0.2	1 × GU30 1 × NVIDIA A10 1 × NVIDIA V100 (32 GB)
     mixtral-8x7b-instruct-v0.1	python webui/webui_server.py --port=8000 --model-path=mistralai/Mixtral-8x7B-Instruct-v0.1	4 × NVIDIA A100 (80 GB)
     gemma-2b-it	python webui/webui_server.py --port=8000 --model-path=google/gemma-2b-it	1 × NVIDIA T4 1 × NVIDIA V100 (16 GB) 1 × GU30 1 × NVIDIA A10
     gemma-7b-it	python webui/webui_server.py --port=8000 --model-path=google/gemma-7b-it	1 × GU30 1 × NVIDIA A10 1 × NVIDIA V100 (32 GB)
     deepseek-coder-7b-instruct-v1.5	python webui/webui_server.py --port=8000 --model-path=deepseek-ai/deepseek-coder-7b-instruct-v1.5	1 × GU30 1 × NVIDIA A10 1 × NVIDIA V100 (32 GB)
     deepseek-coder-33b-instruct	python webui/webui_server.py --port=8000 --model-path=deepseek-ai/deepseek-coder-33b-instruct	1 × NVIDIA A100 (80 GB) 2 × NVIDIA A100 (40 GB) 4 × NVIDIA V100 (32 GB)
     deepseek-v2-lite	python webui/webui_server.py --port=8000 --model-path=deepseek-ai/DeepSeek-V2-Lite-Chat	1 × NVIDIA A10 1 × NVIDIA A100 (40 GB)

References

You can use EAS to deploy a dialog service integrated with LLM and Retrieval-Augmented Generation (RAG). After you use LangChain to integrate your business data, you can use WebUI or API operations to verify the inference capability of the model. For more information, see RAG-based LLM chatbot.