Update app.py

app.py

@@ -3,7 +3,7 @@ import os
 import PyPDF2
 import docx
 from langchain.text_splitter import RecursiveCharacterTextSplitter
-from langchain_cohere import CohereEmbeddings 
+from langchain_community.embeddings import HuggingFaceEmbeddings # Use HuggingFaceEmbeddings
 from langchain_community.vectorstores import Chroma
 from groq import Groq
 from langchain_core.prompts import PromptTemplate
@@ -18,15 +18,8 @@ from datetime import datetime
 
 class DocumentProcessor:
     def __init__(self):
-        # Using CohereEmbeddings for document processing.
-        # Ensure 'COHERE_API_KEY' and 'GROQ_API_KEY' are set as secrets in Hugging Face.
-        if "COHERE_API_KEY" not in os.environ:
-            st.error("Cohere API key is required for document processing.")
-            st.stop()
-        self.embeddings = CohereEmbeddings(
-            cohere_api_key=os.environ["COHERE_API_KEY"], 
-            model="embed-english-v3.0"  # Specify the Cohere embedding model
-        )
+        # Use a free Hugging Face model for embeddings
+        self.embeddings = HuggingFaceEmbeddings(model_name="sentence-transformers/all-MiniLM-L6-v2")
         self.text_splitter = RecursiveCharacterTextSplitter(
             chunk_size=1000,
             chunk_overlap=200