message: Remove redundant output of dataset.element_spec in PostgreSQL tutorial
diff: "id": "8y-VpwcWNYTF"
  },
  "source": [
  - "As you could see from the output of `dataset.element_spec` above, the element of the created `Dataset` is a python dict object with column names of the database table as keys:\n",
  - "```\n",
  - "{\n",
  - " 'co': TensorSpec(shape=(), dtype=tf.float32, name=None),\n",
  - " 'pt08s1': TensorSpec(shape=(), dtype=tf.int32, name=None),\n",
  - "}\n",
  - "```\n",
  - "\n",
  + "As you could see from the output of `dataset.element_spec` above, the element of the created `Dataset` is a python dict object with column names of the database table as keys.\n",
  "It is quite convenient to apply further operations. For example, you could select both `nox` and `no2` field of the `Dataset`, and calculate the difference:"
  ]
  },
  