mirror of
https://github.com/trustgraph-ai/trustgraph.git
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182 lines
4.6 KiB
Python
Executable file
182 lines
4.6 KiB
Python
Executable file
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"""
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Simple LLM service, performs text prompt completion using the Azure
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serverless endpoint service. Input is prompt, output is response.
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"""
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import requests
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import json
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from prometheus_client import Histogram
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import os
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import logging
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from .... exceptions import TooManyRequests
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from .... base import LlmService, LlmResult
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# Module logger
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logger = logging.getLogger(__name__)
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default_ident = "text-completion"
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default_temperature = 0.0
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default_max_output = 4192
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default_model = "AzureAI"
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default_endpoint = os.getenv("AZURE_ENDPOINT")
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default_token = os.getenv("AZURE_TOKEN")
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class Processor(LlmService):
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def __init__(self, **params):
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endpoint = params.get("endpoint", default_endpoint)
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token = params.get("token", default_token)
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temperature = params.get("temperature", default_temperature)
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max_output = params.get("max_output", default_max_output)
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model = default_model
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if endpoint is None:
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raise RuntimeError("Azure endpoint not specified")
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if token is None:
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raise RuntimeError("Azure token not specified")
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super(Processor, self).__init__(
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**params | {
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"endpoint": endpoint,
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"temperature": temperature,
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"max_output": max_output,
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"model": model,
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}
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)
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self.endpoint = endpoint
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self.token = token
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self.temperature = temperature
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self.max_output = max_output
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self.model = model
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def build_prompt(self, system, content):
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data = {
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"messages": [
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{
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"role": "system", "content": system
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},
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{
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"role": "user", "content": content
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}
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],
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"max_tokens": self.max_output,
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"temperature": self.temperature,
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"top_p": 1
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}
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body = json.dumps(data)
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return body
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def call_llm(self, body):
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url = self.endpoint
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# Replace this with the primary/secondary key, AMLToken, or
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# Microsoft Entra ID token for the endpoint
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api_key = self.token
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headers = {
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'Content-Type': 'application/json',
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'Authorization': f'Bearer {api_key}'
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}
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resp = requests.post(url, data=body, headers=headers)
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if resp.status_code == 429:
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raise TooManyRequests()
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if resp.status_code != 200:
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raise RuntimeError("LLM failure")
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result = resp.json()
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return result
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async def generate_content(self, system, prompt):
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try:
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prompt = self.build_prompt(
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system,
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prompt
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)
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response = self.call_llm(prompt)
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resp = response['choices'][0]['message']['content']
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inputtokens = response['usage']['prompt_tokens']
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outputtokens = response['usage']['completion_tokens']
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logger.debug(f"LLM response: {resp}")
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logger.info(f"Input Tokens: {inputtokens}")
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logger.info(f"Output Tokens: {outputtokens}")
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logger.debug("Sending response...")
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resp = LlmResult(
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text = resp,
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in_token = inputtokens,
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out_token = outputtokens,
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model = self.model
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)
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return resp
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except TooManyRequests:
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logger.warning("Rate limit exceeded")
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# Leave rate limit retries to the base handler
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raise TooManyRequests()
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except Exception as e:
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# Apart from rate limits, treat all exceptions as unrecoverable
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logger.error(f"Azure LLM exception ({type(e).__name__}): {e}", exc_info=True)
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raise e
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logger.debug("Azure LLM processing complete")
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@staticmethod
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def add_args(parser):
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LlmService.add_args(parser)
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parser.add_argument(
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'-e', '--endpoint',
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default=default_endpoint,
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help=f'LLM model endpoint'
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)
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parser.add_argument(
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'-k', '--token',
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default=default_token,
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help=f'LLM model token'
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)
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parser.add_argument(
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'-t', '--temperature',
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type=float,
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default=default_temperature,
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help=f'LLM temperature parameter (default: {default_temperature})'
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)
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parser.add_argument(
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'-x', '--max-output',
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type=int,
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default=default_max_output,
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help=f'LLM max output tokens (default: {default_max_output})'
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)
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def run():
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Processor.launch(default_ident, __doc__)
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