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PERF: DataFrame.groupby.nunique #15201

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@jreback jreback commented Jan 23, 2017 •
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closes #15197

In [2]: %timeit df.groupby(['key1', 'key2']).nunique()
100 loops, best of 3: 9.31 ms per loop

    before     after       ratio
  [be3f2aea] [6d026165]
-  473.67μs   427.27μs      0.90  groupby.GroupBySuite.time_nunique('float', 100)
-     4.41s     9.53ms      0.00  groupby.groupby_nunique.time_groupby_nunique

SOME BENCHMARKS HAVE CHANGED SIGNIFICANTLY.

@jreback jreback added Groupby Performance Memory or execution speed performance labels Jan 23, 2017
@jreback jreback added this to the 0.20.0 milestone Jan 23, 2017
@jreback jreback closed this in dc40058 Jan 24, 2017
AnkurDedania pushed a commit to AnkurDedania/pandas that referenced this pull request Mar 21, 2017
@jreback @AnkurDedania
PERF: DataFrame.groupby.nunique
983fdd2 
closes pandas-dev#15197

Author: Jeff Reback <[email protected]>

Closes pandas-dev#15201 from jreback/nunique and squashes the following commits:

6d02616 [Jeff Reback] PERF: DataFrame.groupby.nunique
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PERF: DataFrame.groupby.nunique is non-performant
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