Series.
nunique
Return number of unique elements in the object.
Excludes NA values by default.
dropna (bool, default True) – Don’t include NaN in the count.
combine_size (int, optional) – The number of chunks to combine.
int
See also
DataFrame.nunique
Method nunique for DataFrame.
Series.count
Count non-NA/null observations in the Series.
Examples
>>> import mars.dataframe as md >>> s = md.Series([1, 3, 5, 7, 7]) >>> s.execute() 0 1 1 3 2 5 3 7 4 7 dtype: int64
>>> s.nunique().execute() 4