nb/chat: updated openai modelname and cleaned up key retreival

notebooks/chat.ipynb

@@ -24,16 +24,16 @@
     "import sys\n",
     "from dotenv import load_dotenv, find_dotenv\n",
     "\n",
-    "_ = load_dotenv(find_dotenv()) # read local .env file\n",
-    "# openai.api_key  = os.environ['OPENAI_API_KEY']\n",
+    "# read local .env file (that should contain an \"OPENAI_API_KEY\")\n",
+    "_ = load_dotenv(find_dotenv()) \n",
     "\n",
     "abscurdir = os.path.abspath(os.curdir)\n",
     "docsdir = os.path.join(os.path.dirname(abscurdir), 'docs')\n",
     "existing_dbname = 'chroma_20241124_132314'\n",
     "persist_directory = os.path.join(docsdir, existing_dbname)\n",
     "collection_name = 'MLbooks'\n",
-    "llm_name = 'ollama3.2.1b'\n",
-    "# llm_name = 'openai'"
+    "# llm_name = 'ollama3.2.1b'\n",
+    "llm_name = 'openai'"
    ]
   },
   {
@@ -84,7 +84,7 @@
     "    llm = Ollama(model=\"llama3.2:1b\", temperature=0)\n",
     "elif llm_name == 'openai':\n",
     "    from langchain_openai import ChatOpenAI\n",
-    "    llm = ChatOpenAI(model_name=\"gpt-3.5-turbo\", temperature=0)"
+    "    llm = ChatOpenAI(model_name=\"gpt-4o-mini\", temperature=0)"
    ]
   },
   {