Second Brain

An embeddable, offline-first memory system for AI agents with correctness tracking, neural scoring, and semantic retrieval.

What's New (Phase 2-5)

• Sentence-Transformer Embeddings (src/embedder.py) — Cached, offline, 384-Dim
• ChromaDB Vector Store (src/chroma_store.py) — Semantic similarity search
• Neural Confidence Scorer (src/neural_scorer.py) — PyTorch RL net, trains on confirm/reject feedback
• Hybrid Retrieval (src/retriever.py) — Keyword + Semantic + Neural fusion
• FastAPI Dashboard (fastapi_app.py) — Lightweight web UI (search + confirm/reject) and JSON API
• Streamlit Dashboard (src/app_dashboard.py) — (optional) richer UI for neural training, etc.
• Graph Visualization (src/graph_view.py) — Interactive Cytoscape.js graph with confidence colors

Architecture

Obsidian

Setup and timers: second-brain/docs/OBSIDIAN.md

Quickstart (Dashboard)

Install minimal dashboard deps:

python3 -m pip install -r requirements-dashboard.txt

Run:

SECOND_BRAIN_WORKSPACE="$(pwd)" python3 fastapi_app.py

Then open: http://localhost:8501/

Port is configurable via SECOND_BRAIN_PORT (or PORT), e.g.:

SECOND_BRAIN_WORKSPACE="$(pwd)" SECOND_BRAIN_PORT=8502 python3 fastapi_app.py