Merge pull request #2924 from ales-erjavec/fixes/contingency-outoff-bounds

[FIX] contingency.pyx: Fix out of bound write

Author: lanzagar

Orange/classification/rules.py

@@ -559,7 +559,7 @@ def find_new_selectors(self, X, Y, W, domain, existing_selectors):
     @staticmethod
     def discretize(X, Y, W, domain):
         values, counts, _ = _contingency.contingency_floatarray(
-            X, Y.astype(dtype=np.int8), len(domain.class_var.values), W)
+            X, Y.astype(dtype=np.intp), len(domain.class_var.values), W)
         cut_ind = np.array(EntropyMDL._entropy_discretize_sorted(counts.T, True))
         return [values[smh] for smh in cut_ind]