270 lines
11 KiB
Python
270 lines
11 KiB
Python
import json
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import os
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import re
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import textwrap
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from datetime import datetime
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from typing import Dict, List
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from dotenv import load_dotenv
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from langchain_core.messages.ai import AIMessage
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from langchain_core.output_parsers import StrOutputParser
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from langchain_core.prompt_values import StringPromptValue
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from langchain_core.prompts import ChatPromptTemplate
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from langchain_openai import ChatOpenAI
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from Levenshtein import distance
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import strings
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load_dotenv()
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class LLMLogger:
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def __init__(self, llm: ChatOpenAI):
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self.llm = llm
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@staticmethod
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def log_request(prompts, parsed_reply: Dict[str, Dict]):
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calls_log = os.path.join(os.getcwd(), "open_ai_calls.json")
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if isinstance(prompts, StringPromptValue):
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prompts = prompts.text
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elif isinstance(prompts, Dict):
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# Convert prompts to a dictionary if they are not in the expected format
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prompts = {
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f"prompt_{i+1}": prompt.content
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for i, prompt in enumerate(prompts.messages)
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}
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else:
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prompts = {
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f"prompt_{i+1}": prompt.content
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for i, prompt in enumerate(prompts.messages)
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}
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current_time = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
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# Extract token usage details from the response
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token_usage = parsed_reply["usage_metadata"]
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output_tokens = token_usage["output_tokens"]
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input_tokens = token_usage["input_tokens"]
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total_tokens = token_usage["total_tokens"]
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# Extract model details from the response
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model_name = parsed_reply["response_metadata"]["model_name"]
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prompt_price_per_token = 0.00000015
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completion_price_per_token = 0.0000006
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# Calculate the total cost of the API call
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total_cost = (input_tokens * prompt_price_per_token) + (
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output_tokens * completion_price_per_token
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)
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# Create a log entry with all relevant information
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log_entry = {
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"model": model_name,
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"time": current_time,
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"prompts": prompts,
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"replies": parsed_reply["content"], # Response content
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"total_tokens": total_tokens,
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"input_tokens": input_tokens,
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"output_tokens": output_tokens,
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"total_cost": total_cost,
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}
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# Write the log entry to the log file in JSON format
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with open(calls_log, "a", encoding="utf-8") as f:
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json_string = json.dumps(log_entry, ensure_ascii=False, indent=4)
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f.write(json_string + "\n")
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class LoggerChatModel:
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def __init__(self, llm: ChatOpenAI):
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self.llm = llm
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def __call__(self, messages: List[Dict[str, str]]) -> str:
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# Call the LLM with the provided messages and log the response.
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reply = self.llm(messages)
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parsed_reply = self.parse_llmresult(reply)
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LLMLogger.log_request(prompts=messages, parsed_reply=parsed_reply)
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return reply
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def parse_llmresult(self, llmresult: AIMessage) -> Dict[str, Dict]:
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# Parse the LLM result into a structured format.
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content = llmresult.content
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response_metadata = llmresult.response_metadata
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id_ = llmresult.id
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usage_metadata = llmresult.usage_metadata
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parsed_result = {
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"content": content,
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"response_metadata": {
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"model_name": response_metadata.get("model_name", ""),
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"system_fingerprint": response_metadata.get("system_fingerprint", ""),
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"finish_reason": response_metadata.get("finish_reason", ""),
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"logprobs": response_metadata.get("logprobs", None),
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},
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"id": id_,
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"usage_metadata": {
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"input_tokens": usage_metadata.get("input_tokens", 0),
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"output_tokens": usage_metadata.get("output_tokens", 0),
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"total_tokens": usage_metadata.get("total_tokens", 0),
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},
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}
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return parsed_result
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class GPTAnswerer:
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def __init__(self, openai_api_key):
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self.llm_cheap = LoggerChatModel(
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ChatOpenAI(
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model_name="gpt-4o-mini", openai_api_key=openai_api_key, temperature=0.8
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)
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)
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@property
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def job_description(self):
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return self.job.description
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@staticmethod
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def find_best_match(text: str, options: list[str]) -> str:
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# Find the best match for the given text from a list of options using Levenshtein distance.
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distances = [
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(option, distance(text.lower(), option.lower())) for option in options
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]
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best_option = min(distances, key=lambda x: x[1])[0]
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return best_option
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@staticmethod
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def _remove_placeholders(text: str) -> str:
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# Remove placeholder text from a string.
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text = text.replace("PLACEHOLDER", "")
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return text.strip()
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@staticmethod
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def _preprocess_template_string(template: str) -> str:
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# Preprocess a template string to remove unnecessary indentation.
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return textwrap.dedent(template)
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def set_resume(self, resume):
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self.resume = resume
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def set_job(self, job):
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self.job = job
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self.job.set_summarize_job_description(
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self.summarize_job_description(self.job.description)
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)
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def summarize_job_description(self, text: str) -> str:
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strings.summarize_prompt_template = self._preprocess_template_string(
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strings.summarize_prompt_template
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)
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prompt = ChatPromptTemplate.from_template(strings.summarize_prompt_template)
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chain = prompt | self.llm_cheap | StrOutputParser()
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output = chain.invoke({"text": text})
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return output
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def get_resume_html(self):
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resume_markdown_prompt = ChatPromptTemplate.from_template(strings.resume_markdown_template)
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fusion_job_description_resume_prompt = ChatPromptTemplate.from_template(strings.fusion_job_description_resume_template)
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resume_markdown_chain = resume_markdown_prompt | self.llm_cheap | StrOutputParser()
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fusion_job_description_resume_chain = fusion_job_description_resume_prompt | self.llm_cheap | StrOutputParser()
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#html_template = strings.html_template.format(email_address=self.resume.personal_information.email, phone_number=self.resume.personal_information.phonePrefix + self.resume.personal_information.phone , github_link=self.resume.personal_information.github, linkedin_link=self.resume.personal_information.linkedin,city=self.resume.personal_information.city,country=self.resume.personal_information.country)
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composed_chain = (
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resume_markdown_chain
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| (lambda output: {"job_description": self.job.summarize_job_description, "formatted_resume": output})
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| fusion_job_description_resume_chain
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| (lambda formatted_resume: strings.html_template + formatted_resume)
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)
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try:
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output = composed_chain.invoke({
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"resume": self.resume,
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"job_description": self.job.summarize_job_description
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})
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return output
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except Exception as e:
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#print(f"Error during elaboration: {e}")
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pass
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def _create_chain(self, template: str):
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prompt = ChatPromptTemplate.from_template(template)
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return prompt | self.llm_cheap | StrOutputParser()
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def answer_question_textual_wide_range(self, question: str) -> str:
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# Define chains for each section of the resume
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self.chains = {
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"personal_information": self._create_chain(strings.personal_information_template),
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"self_identification": self._create_chain(strings.self_identification_template),
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"legal_authorization": self._create_chain(strings.legal_authorization_template),
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"work_preferences": self._create_chain(strings.work_preferences_template),
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"education_details": self._create_chain(strings.education_details_template),
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"experience_details": self._create_chain(strings.experience_details_template),
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"projects": self._create_chain(strings.projects_template),
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"availability": self._create_chain(strings.availability_template),
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"salary_expectations": self._create_chain(strings.salary_expectations_template),
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"certifications": self._create_chain(strings.certifications_template),
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"languages": self._create_chain(strings.languages_template),
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"interests": self._create_chain(strings.interests_template),
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}
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section_prompt = (
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f"For the following question: '{question}', which section of the resume is relevant? "
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"Respond with one of the following: Personal information, Self Identification, Legal Authorization, "
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"Work Preferences, Education Details, Experience Details, Projects, Availability, Salary Expectations, "
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"Certifications, Languages, Interests."
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)
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prompt = ChatPromptTemplate.from_template(section_prompt)
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chain = prompt | self.llm_cheap | StrOutputParser()
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output = chain.invoke({"question": question})
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section_name = output.lower().replace(" ", "_")
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resume_section = getattr(self.resume, section_name, None)
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if resume_section is None:
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raise ValueError(f"Section '{section_name}' not found in the resume.")
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# Use the corresponding chain to answer the question
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chain = self.chains.get(section_name)
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if chain is None:
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raise ValueError(f"Chain not defined for section '{section_name}'")
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output_str = chain.invoke({"resume_section": resume_section, "question": question})
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return output_str
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def answer_question_textual(self, question: str) -> str:
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template = self._preprocess_template_string(strings.resume_stuff_template)
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prompt = ChatPromptTemplate.from_template(template)
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chain = prompt | self.llm_cheap | StrOutputParser()
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output = chain.invoke({"resume": self.resume, "question": question})
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return output
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def answer_question_numeric(self, question: str, default_experience: int = 3) -> int:
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func_template = self._preprocess_template_string(strings.numeric_question_template)
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prompt = ChatPromptTemplate.from_template(func_template)
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chain = prompt | self.llm_cheap | StrOutputParser()
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output_str = chain.invoke({"resume": self.resume, "question": question, "default_experience": default_experience})
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try:
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output = self.extract_number_from_string(output_str)
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except ValueError:
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output = default_experience
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return output
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def extract_number_from_string(self, output_str):
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numbers = re.findall(r"\d+", output_str)
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if numbers:
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return int(numbers[0])
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else:
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raise ValueError("No numbers found in the string")
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def answer_question_from_options(self, question: str, options: list[str]) -> str:
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func_template = self._preprocess_template_string(strings.options_template)
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prompt = ChatPromptTemplate.from_template(func_template)
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chain = prompt | self.llm_cheap | StrOutputParser()
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output_str = chain.invoke({"resume": self.resume, "question": question, "options": options})
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best_option = self.find_best_match(output_str, options)
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return best_option
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