[GRASS-dev] [GRASS GIS] #3390: r.learn.ml crossvalidation fails if category map class codes increase more then +1

[GRASS GIS]

#3390: r.learn.ml crossvalidation fails if category map class codes increase more
then +1
--------------------+-------------------------
 Reporter:  maitl   |      Owner:  grass-dev@…
     Type:  defect  |     Status:  new
 Priority:  normal  |  Milestone:  7.2.2
Component:  Addons  |    Version:  unspecified
 Keywords:          |        CPU:  All
 Platform:  All     |
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 Crossvalidation fails if class ID values in category maps do not increase
 strictly by +1 i.e 1, 2, 3, 4, 5, 6 ... .

 E.g. a cass code list  10, 11, 12, 13, 25, 26 is not handled properly.

 The bug is here:

 if mode == 'classification' and cv > np.histogram(
                     y, bins=len(np.unique(y)))[0].min():

 The solution is to use

 if mode == 'classification' and cv > np.histogram(
                    y, bins=np.unique(y))[0].min():

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3390>
GRASS GIS <https://grass.osgeo.org>