fix users bug and emphasize kernal restart (#2407)

Author: TheMichaelHu

tables/automl/notebooks/music_recommendation/music_recommendation.ipynb

@@ -84,14 +84,14 @@
  "metadata": {},
  "outputs": [],
  "source": [
- "! pip install --upgrade --quiet google-cloud-automl google-cloud-bigquery"
+ "! pip3 install --upgrade --quiet google-cloud-automl google-cloud-bigquery"
  ]
  },
  {
  "cell_type": "markdown",
  "metadata": {},
  "source": [
- "Restart the kernel to allow `automl_v1beta1` to be imported. The following cell should succeed after a kernel restart:"
+ "__Restart the kernel__ to allow `automl_v1beta1` to be imported. The following cell should succeed after a kernel restart:"
  ]
  },
  {
@@ -624,10 +624,10 @@
  " WHERE user = \"{}\" AND CAST(tables.value AS INT64) = 1\n",
  " ORDER BY score DESC\n",
  " LIMIT {}\n",
- "\"\"\".format(output_uri[5:].replace(\":\", \".\"), training_table, user, n)\n",
+ "\"\"\".format(output_uri[5:].replace(\":\", \".\"), training_table, users[0], n)\n",
  "query_job = bq_client.query(query)\n",
  "\n",
- "print(\"Top {} song recommended for {}:\".format(n, user))\n",
+ "print(\"Top {} song recommended for {}:\".format(n, users[0]))\n",
  "for idx, row in enumerate(query_job):\n",
  " print(\"{}.\".format(idx + 1), row[\"song\"])"
  ]