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PERF: improves performance in remove_unused_categories #11643

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PERF: improves performance in remove_unused_categories #11643

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behzadnouri
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on master:

In [1]: np.random.seed(2718281)

In [2]: n = 1 << 20

In [3]: ix = tm.makeCategoricalIndex(n, n // 10)

In [4]: %timeit ix.remove_unused_categories()
1 loops, best of 3: 527 ms per loop

on branch:

In [4]: %timeit ix.remove_unused_categories()
1 loops, best of 3: 216 ms per loop

@jreback jreback added Performance Memory or execution speed performance Categorical Categorical Data Type labels Nov 19, 2015
@jreback jreback added this to the 0.17.1 milestone Nov 19, 2015
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jreback commented Nov 19, 2015

merged via 7031e5f

thanks you sir!

@jreback jreback closed this Nov 19, 2015
@behzadnouri behzadnouri deleted the cat-rm-unused branch November 21, 2015 21:41
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