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@@ -259,7 +259,7 @@ class Learner2D(BaseLearner):
                                      self._vdim = len(value)
                                  except TypeError:
                                      self._vdim = 1
                     -        return self._vdim if self._vdim is not None else 1
                     +        return self._vdim or 1
                          @property
                          def bounds_are_done(self):

2D: simplify inline if else statement