code: def value_counts(self):
          
          from .sframe import SFrame as _SFrame
          return _SFrame({'value':self}).groupby('value', {'count':_aggregate.COUNT}).sort('count', ascending=False)
docs: Return an SFrame containing counts of unique values. The resulting
          SFrame will be sorted in descending frequency.
  
          Returns
          -------
          out : SFrame
              An SFrame containing 2 columns : 'value', and 'count'. The SFrame will
              be sorted in descending order by the column 'count'.
  
          See Also
          --------
          SFrame.summary
  
          Examples
          --------
          >>> sa = turicreate.SArray([1,1,2,2,2,2,3,3,3,3,3,3,3])
          >>> sa.value_counts()
              Columns:
                      value	int
                      count	int
              Rows: 3
              Data:
              +-------+-------+
              | value | count |
              +-------+-------+
              |   3   |   7   |
              |   2   |   4   |
              |   1   |   2   |
              +-------+-------+
              [3 rows x 2 columns]