Remove mention of LANGCHAIN_COMET_TRACING for now

integrations/llm/langchain/notebooks/Comet_with_Langchain.ipynb

@@ -97,10 +97,10 @@
    "source": [
     "# Tracing with Comet\n",
     "\n",
-    "There are two ways to trace your LangChains executions with Comet:\n",
+    "In order to trace your LangChains executions with Comet:\n",
     "\n",
-    "1. Setting the `LANGCHAIN_COMET_TRACING` environment variable to \"true\". This is the recommended way.\n",
-    "2. Import the `CometTracer` manually and pass it explicitely."
+    "1. Import the `CometTracer` manually and pass it explicitely.\n",
+    "2. Pass it to each execution"
    ]
   },
   {
@@ -109,7 +109,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "os.environ[\"LANGCHAIN_COMET_TRACING\"] = \"true\"\n",
     "from langchain.callbacks.tracers.comet import CometTracer"
    ]
   },
@@ -132,8 +131,10 @@
     "\n",
     "llm = OpenAI(temperature=0.9, verbose=True)\n",
     "\n",
+    "callback = CometTracer()\n",
+    "\n",
     "for prompt in [\"Tell me a joke\", \"Tell me a poem\", \"Tell me a fact\"]:\n",
-    "    llm_result = llm.generate([prompt])\n",
+    "    llm_result = llm.generate([prompt], callbacks=[callback])\n",
     "    print(\"LLM result\", llm_result)"
    ]
   },
@@ -162,8 +163,10 @@
     "prompt_template = PromptTemplate(input_variables=[\"title\"], template=template)\n",
     "synopsis_chain = LLMChain(llm=llm, prompt=prompt_template)\n",
     "\n",
+    "callback = CometTracer()\n",
+    "\n",
     "test_prompts = [{\"title\": \"Documentary about Bigfoot in Paris\"}]\n",
-    "print(synopsis_chain.apply(test_prompts))"
+    "print(synopsis_chain.apply(test_prompts, callbacks=[callback]))"
    ]
   },
   {
@@ -190,10 +193,21 @@
     "    llm,\n",
     "    agent=\"zero-shot-react-description\",\n",
     ")\n",
+    "\n",
+    "callback = CometTracer()\n",
+    "\n",
     "agent.run(\n",
     "    \"What is 2 raised to .123243 power?\",\n",
+    "    callbacks=[callback],\n",
     ")"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {