Streamlining the Hiring Process with OpenAI and LangChain Part 1

The Spotlight Dilemma: Sorting Stars from Stardom

Imagine you're the director of the most incredible talent show in town, searching for the brightest stars to light up the stage. Your job? To find the most dazzling performers who will leave the audience in awe. In the past, you'd have a stack of audition tapes to watch, which could be overwhelming. But now, with the rise of digital technology, you're flooded with videos from all around the world. It's like trying to find a needle in a haystack!

Navigating Recruitment Challenges: Unveiling Unseen Talent Gems

Here's the kicker: sometimes you might accidentally pick a performer just because they remind you of someone you know. That means you might miss out on some incredible acts that bring fresh and unique flavors to your show. And trust me, you don't want to miss out on the next superstar because they dance to a different beat.

Traditionally, you might have relied on word-of-mouth or the familiar faces you've seen before. But think about it, that might mean you're passing up on the chance to discover a hidden gem – a performer with a new style that the world has yet to see.

Ever had that moment when you're singing one song in your head, but your friend is humming a completely different tune? Well, imagine you've got a group of judges, each with their own musical taste. What one judge loves, another might not be crazy about. It's like trying to pick the best ice cream flavor, and everyone has their own favorite.

Now, picture this: the whole talent search process taking so long that amazing acts get snatched up by other shows. It's like watching a magician disappear in a puff of smoke before you even say "ta-da!" And if you're not crystal clear about how you're choosing your acts, they might feel like they're solving a puzzle without all the pieces.

But hey, what if you had a magical assistant who could watch all the auditions, spot the real gems, and help you tackle these challenges head-on? This incredible sidekick could make your job as a talent show director a breeze, and your stage would be graced with even more extraordinary performances!

That's where LLMs - our modern-day magic helpers - come in for HR recruiters. They can help unearth the top talents, conquer these hurdles, and let recruiters focus on the most exciting parts of their gig. It's like having a team of assistants who always know the perfect act to steal the show.

Unveiling the Bot: Your Backstage Buddy for Talent Hunting!

Introducing the Talent Scouter Bot - your trusty assistant, powered by super-smart technology. It's like having a backstage helper who can chat about all those audition tapes, just like friends discussing their favorite acts.

You share the job description and what you're looking for in a superstar performer, and the Bot jumps into action. It chats with you like a friendly colleague, asking questions, and even provides a scorecard for each act's relevance to the role.

But here's where the magic happens. The Bot isn't just about numbers. It actually understands the resumes, just like you would read a story. It figures out who danced their way through college, who's a master at magic tricks, and who's a stand-up comedy sensation.

Now, let's dive into how this genius works:

This is the resume we're going to use throughout this guide: John-Doe's PDF Resume

Process

Step 1 - Audition Files

Imagine your Bot grabbing the audition tapes (resumes) and giving them a good watch (reading). It's like flipping through pages, but way faster. We're using special tools from LangChain, PyMuPDFLoader, to make this happen.

PyMuPDFLoader will load the contents of every page in the resume and store them in a Document object. We can access the content of each page using the page_content attribute.

from langchain.document_loaders import PyMuPDFLoader

resume_path = "./resumes/john-doe.pdf"
loader = PyMuPDFLoader(file_path=resume_path)
resume_content = loader.load()
print(resume_content[0].page_content)

Step 2 - Spotlight Highlights

The Bot is a pro at finding the golden nuggets. It picks out the coolest parts of each act and creates a quick summary. Think of it like the highlights reel of a sports game – only for resumes. To make this happen, we’re going to use summarize chains and chat models modules from LangChain as well, specifically load_summarize_chain and ChatOpenAI.

load_summarize_chain would take the resume's content and make a concise summary for it based on the prompt we pass to it, SUMMARY_PROMPT, here.

from langchain.chains.summarize import load_summarize_chain
from langchain.chat_models import ChatOpenAI
from langchain.prompts import PromptTemplate

# Summarization Prompt
single_resume_tempate =
"""
You are an expert at extracting information from a resume.
Use the given resumes text to write a concise summary.
The summary must include the following sections:
1. Name
2. Contact Information
3. Professional Summary or Objective
4. Work Experience
5. Internships
6. Education
7. Skills
8. Achievements and Accomplishments
9. Relevant Projects
10. Certifications
11. Volunteer Work and Extracurricular Activities
12. Publications and Presentations
13. Personal Interests
14. Extra Useful Information such as years of experience,
working environment (On-site,remote or hybrid), will to
relocate for a job (yes or no), military status (exempted,
completed, required)...etc.
{text}
Your final answer must not exceed 1000 words. """
SUMMARY_PROMPT = PromptTemplate(template=single_resume_tempate,
                                input_variables=['text'])

# Chat Model
llm = ChatOpenAI(model_name='gpt-4', temperature=0)

# Summarize Chain
single_summary_chain = load_summarize_chain(
  llm=llm,
  chain_type='stuff',
  prompt=SUMMARY_PROMPT
)

# Print Summary
print single_summary_chain.run(resume_content)

Step 3 - Storing Magic

Just like you have a drawer for your favorite things, the Bot has a digital space to keep those resume summaries. This makes it easy to find and chat about each act later on. It's like organizing your superhero cards. In order to do this, we’re going to utilize embeddings and vector stores from LangChain, especially OpenAIEmbeddings and Chroma.

Chroma is our vector store. It would use the OpenAIEmbeddings to embed the resume's content and store them for retrieval. Think of Chroma as a database that stores data about our resume.

from langchain.embeddings import OpenAIEmbeddings
from langchain.docstore.document import Document
from langchain.vectorstores import Chroma

resume_summary = single_summary_chain.run(data)
summary_documents = [Document(page_content=str(resume_summary),
metadata={'source': resume_path})]
embeddings = OpenAIEmbeddings()
vectorstore = Chroma.from_documents(documents=summary_documents,
embedding=embeddings)

Step 4 - Chat Showtime

This is where the magic comes alive. The Bot turns into a lively conversation, ready to discuss the acts. You throw questions like confetti, and the Bot pulls out the perfect answers from its magic hat. In order to make this happen, we are going to use the chains module from LangChain, specifically ConversationalRetrievalChain.

ConversationalRetrievalChain allows us to have a conversation with LLM about our resumes. The ConversationBufferMemory powers our ConversationalRetrievalChain with memory, like human memory, so we can ask questions using pronouns like he, she, they...etc. instead of using the names every single time.

from langchain.memory import ConversationBufferMemory
from langchain.chains import ConversationalRetrievalChain

memory = ConversationBufferMemory(
memory_key='chat_history',
return_messages=True
)
chain = ConversationalRetrievalChain.from_llm(
llm=llm,
memory=memory,
verbose=False, chain_type='stuff',
retriever=vectorstore.as_retriever()
)

question = 'Who is the resume about?'
result = chain({'question': question})

print result['answer']

# The resume is about John Doe

With a wave of LangChain's wizardry, we've created a Bot that can chat about talents, just like you'd talk about your favorite show. 🎤🎭 And guess what? You don't need to be a tech wizard to use it - it's all designed to make your talent-hunting adventure easy and fun.

So, next time you're searching for the brightest star in your talent galaxy, let the Talent Scouter Bot be your guide. It's like having a chatty sidekick who's always ready to help you find the next big sensation! 🎉🎵🤖

See part 2 to know more about Langchain, LLMs and more.