CognitiveNexus

CognitiveNexus is an AI-powered knowledge and productivity assistant built using Python and Streamlit. The system adapts its prompts according to the user's task, maintains conversational context, retrieves relevant information from uploaded PDF documents, and evaluates generated responses. It provides a multi-purpose AI assistant for different user tasks, implementing Smart Prompt Engineering and supporting task-specific AI responses. The assistant offers six AI modes: Research, Study, Analysis, Content, Creative, and General Chat. It also includes a personalized study mode with options such as Auto Detect, Explanation, Summary, Quiz, Flashcards, and Learning Plan. The RAG knowledge assistant allows users to upload PDF documents, extract text, divide documents into smaller chunks, retrieve relevant chunks using TF-IDF and cosine similarity, and use retrieved content as context for AI responses. Conversation memory maintains previous messages during the active Streamlit session, using conversation history as context for subsequent questions. Response evaluation assesses generated responses using relevance, completeness, accuracy, hallucination risk, and overall score. Source support provides retrieved source/page information when available. The system architecture includes user input, mode selection, task detection, smart prompt optimization, conversation memory, PDF retrieval, structured prompt, Hugging Face Inference API, AI response, source support, response evaluation, and final output.