message: Fix Model Maker text classification notebook to demo MobileBERT
diff: " filename='train.csv',\n",
  " text_column='sentence',\n",
  " label_column='label',\n",
  - " model_spec=spec,\n",
  + " model_spec=mb_spec,\n",
  " is_training=True)\n",
  "test_data = TextClassifierDataLoader.from_csv(\n",
  " filename='dev.csv',\n",
  " text_column='sentence',\n",
  " label_column='label',\n",
  - " model_spec=spec,\n",
  + " model_spec=mb_spec,\n",
  " is_training=False)"
  ]
  },
  },
  "outputs": [],
  "source": [
  - "model = text_classifier.create(train_data, model_spec=spec, epochs=3)"
  + "model = text_classifier.create(train_data, model_spec=mb_spec, epochs=3)"
  ]
  },
  {
  