chore & fix(deap/tools/emo.py:selTournamentDCD): check on value of k …

…& throw ValueError for failed input validation Now, if number of individuals to select(stored in parameter `k`) is not multiple of 4, it will throw. In addition, throw `ValueError` instead of generic `Exception` when input is invalid.
joaofracasso · Apr 30, 2019 · 64f1334 · 64f1334
1 parent e1a52b2
commit 64f1334
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/deap/tools/emo.py b/deap/tools/emo.py
@@ -157,9 +157,12 @@ def selTournamentDCD(individuals, k):
     :returns: A list of selected individuals.
     """
 
-    if len(individuals)%4 !=0:
-        raise Exception("selTournamentDCD: individuals length must be a multiple of 4")
+    if len(individuals) % 4 != 0:
+        raise ValueError("selTournamentDCD: individuals length must be a multiple of 4")
 
+    if k % 4 != 0:
+        raise ValueError("selTournamentDCD: number of individuals to select must be a multiple of 4")
+
     def tourn(ind1, ind2):
         if ind1.fitness.dominates(ind2.fitness):
             return ind1