Help needed with code

[prachuspyder]

Hi I have created a code for a chatbot with Langchain. The code is below.

import PyPDF2
from langchain.llms import OpenAI # Ensure correct import
from langchain.chains import OpenAIModerationChain
import os

def read_pdf(file_path):
try:
with open(file_path, 'rb') as file:
pdf_reader = PyPDF2.PdfReader(file)
text = ''
for page_num in range(pdf_reader.numPages):
page = pdf_reader.getPage(page_num)
text += page.extractText()
return text
except Exception as e:
print(f"Error reading {file_path}: {e}")
return ""

openai_api_key = "xxxxxxxxxxx" # Update with your key
if not openai_api_key:
raise ValueError("API key not found. Set your OpenAI API key as an environment variable.")

Initialize Langchain with OpenAI LLM

langchain_client = OpenAI(api_key=openai_api_key) # Use OpenAI LLM instance
openai_chain = OpenAIModerationChain(llm=langchain_client) # Create OpenAIChain instance

def search_documents(query, documents):
for doc in documents:
if query.lower() in doc.lower():
return doc[:200]
return "No relevant information found."

def maintenance_chatbot(query, documents):
response = openai_chain.run(query=query) # Use openai_chain.run for question answering
answer = search_documents(response, documents)
return answer

pdf_file_paths = [
r"C:\Users\UNME\Downloads\Langchain trial\Honeywell_Forge_DM_EO_Interactive Brochure.pdf",
r"C:\Users\UNME\Downloads\Langchain trial\CB_Ebook_Predictive Maintenance_CRE.pdf",
r"C:\Users\UNME\Downloads\Langchain trial\CB_ESA_BROCHURE_UpdateQ421.pdf",
r"C:\Users\UNME\Downloads\Langchain trial\CB_Global Internet Connectivity Standard.pdf",
r"C:\Users\UNME\Downloads\Langchain trial\CB_Technical Specifications_Energy Optimization.pdf",
r"C:\Users\UNME\Downloads\Langchain trial\CB_Brochure_Predictive Maintenance_CRE.pdf",
r"C:\Users\UNME\Downloads\Langchain trial\CB_Brochure_Predictive Maintenance_Higher Ed.pdf",
r"C:\Users\UNME\Downloads\Langchain trial\CB_Brochure_Predictive Maintenance_Retail.pdf",
r"C:\Users\UNME\Downloads\Langchain trial\CB_Competitive_Intel_EO & Sustainability_H1 2020.pdf",
r"C:\Users\UNME\Downloads\Langchain trial\CB_Ebook_Modernize Your Maintenance With Intelligent Automation_MSFT.pdf",
r"C:\Users\UNME\Downloads\Langchain trial\CB_Brochure_Honeywell Forge_Industrial-Manufacturing.pdf"

]

pdf_texts = [read_pdf(file_path) for file_path in pdf_file_paths if os.path.exists(file_path)]

user_query = "How often should I perform maintenance checks?"
print(maintenance_chatbot(user_query, pdf_texts))

I am getting an error "NameError: name 'get_pydantic_field_names' is not defined"

Could someone let me know what I am doing incorrectly? I have installed langchain-community already.

Thanks in advance