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    "falls auf dem mac gearbeitet wird: \n",
    "homebrew installieren:\n",
    "a) terminal öffnen und die befehle von b) und c) exakt so eingeben:\n",
    "b) /bin/bash -c \"$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)\"\n",
    "c) echo 'eval \"$(/opt/homebrew/bin/brew shellenv)\"' >> ~/.zprofile\n",
    "eval \"$(/opt/homebrew/bin/brew shellenv)\"\n",
    "d) brew --version\n",
    "c) brew install graphviz"
   ]
  },
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    "# --- INSTALLATION DER KERNSYSTEME ---\n",
    "# LangChain & LangGraph\n",
    "%pip install -U langchain langchain-community langgraph\n",
    "\n",
    "# Vektor-Datenbank\n",
    "%pip install chromadb\n",
    "\n",
    "# PDF-Verarbeitung\n",
    "%pip install pypdf\n",
    "\n",
    "# LLM-Anbindung (OpenAI & HuggingFace für lokale Embeddings)\n",
    "%pip install langchain-openai langchain-huggingface sentence-transformers\n",
    "\n",
    "# User Interface\n",
    "%pip install gradio\n",
    "\n",
    "# pymupdf als verbesserte library für die pdf-verarbeitung:\n",
    "%pip install pymupdf\n",
    "\n",
    "# word-dokumentverarbeitung\n",
    "%pip install langchain-community docx2txt\n",
    "\n",
    "# NEU: BM25 für Hybrid Search (lexikalischer Retriever)\n",
    "%pip install rank_bm25"
   ]
  }
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