title: take subset from a dataframe
body: <p>i'm planning to take a subset from a dataframe.</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>A</th>
  <th>B</th>
  <th>C</th>
  <th>Label</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td>3</td>
  <td>2</td>
  <td>3</td>
  <td>chair</td>
  </tr>
  <tr>
  <td>2</td>
  <td>4</td>
  <td>5</td>
  <td>table</td>
  </tr>
  <tr>
  <td>3</td>
  <td>2</td>
  <td>3</td>
  <td>table</td>
  </tr>
  <tr>
  <td>2</td>
  <td>4</td>
  <td>5</td>
  <td>chair</td>
  </tr>
  <tr>
  <td>3</td>
  <td>2</td>
  <td>3</td>
  <td>drawer</td>
  </tr>
  <tr>
  <td>2</td>
  <td>4</td>
  <td>5</td>
  <td>drawer</td>
  </tr>
  <tr>
  <td>3</td>
  <td>2</td>
  <td>3</td>
  <td>chair</td>
  </tr>
  <tr>
  <td>2</td>
  <td>4</td>
  <td>5</td>
  <td>table</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>i know the first step is to group by the dataframe based on the label. Then i want to take a subset of row with only label &quot;chair&quot;, &quot;chair &amp; table&quot;, &quot;chair &amp; table &amp; drawer&quot; and put it into a new dataframe (there will be 3 separate dataframe in the end).
  Is it possible to do this if i turn the data into numpy array and separate the label?</p>
  <p>Thank you!</p>