diff --git a/Demos/demos_module/iris_demo.py b/Demos/demos_module/iris_demo.py
index 4068cca..da21225 100644
--- a/Demos/demos_module/iris_demo.py
+++ b/Demos/demos_module/iris_demo.py
@@ -44,11 +44,11 @@
 
 runner = 1 # 1: single thread, 2+: corresponding multi-thread
 
-n_gen = 20
+n_gen = 10
 n_pop = 50
     
 nRules = 10
-nAnts = 7
+nAnts = 3
 tolerance = 0.001
 
 iris = datasets.load_iris()
@@ -72,7 +72,8 @@
 fl_classifier.fit(X_train, y_train, n_gen=n_gen, pop_size=n_pop, checkpoints=0, random_state=0)
 
 # print(vis_rules.rules_to_latex(fl_classifier.rule_base))
-str_rules = eval_tools.eval_fuzzy_model(fl_classifier, X_train, y_train, X_test, y_test, 
+fuzzy_evaluator = eval_tools.FuzzyEvaluator(fl_classifier)
+str_rules = fuzzy_evaluator.eval_fuzzy_model(X_train, y_train, X_test, y_test, 
                         plot_rules=False, print_rules=True, plot_partitions=True, return_rules=True)
 rule_matrix = fl_classifier.rule_base.get_rulebase_matrix()
 
diff --git a/ex_fuzzy/ex_fuzzy/eval_tools.py b/ex_fuzzy/ex_fuzzy/eval_tools.py
index c5a5a33..5ddef35 100644
--- a/ex_fuzzy/ex_fuzzy/eval_tools.py
+++ b/ex_fuzzy/ex_fuzzy/eval_tools.py
@@ -37,7 +37,7 @@ def get_metric(self,metric:str,X_true:np.array,y_true:np.array,**kwargs):
         '''
         #Get y predictions
         y_pred = self.predict(X_true)
-
+        y_true = np.array(y_true)
         #Convert str classes to numbers in corresponding class if necessary
         unique_classes = self.fl_classifier.classes_names
 
@@ -55,6 +55,7 @@ def get_metric(self,metric:str,X_true:np.array,y_true:np.array,**kwargs):
         except TypeError:
               return f"Invalid arguments passed for the metric '{metric}'."
         
+        
     def eval_fuzzy_model(self,X_train: np.array, y_train: np.array,X_test: np.array, y_test: np.array, 
                          plot_rules=True, print_rules=True, plot_partitions=True, 
                      return_rules=False, print_accuracy=True, print_matthew=True, export_path:str=None) -> None:
@@ -89,10 +90,10 @@ def eval_fuzzy_model(self,X_train: np.array, y_train: np.array,X_test: np.array,
       if print_matthew:
             print('MATTHEW CORRCOEF')
             print('Train performance: ' +
-                  str(self.get_metric('mattews_corrcoef',X_train,y_train))
+                  str(self.get_metric('matthews_corrcoef',X_train,y_train))
                   )
             print('Test performance: ' +
-                  str(self.get_metric('mattews_corrcoef',X_test,y_test))
+                  str(self.get_metric('matthews_corrcoef',X_test,y_test))
                   )
             print('------------')
 
diff --git a/setup.py b/setup.py
index a301cc4..b6b08a5 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@
 URL = "https://github.com/Fuminides/ex-fuzzy"
 LICENSE = "GPL-3.0"
 DOWNLOAD_URL = "https://pypi.org/project/ex-fuzzy/"
-VERSION = "1.5.2"
+VERSION = "1.5.2b"
 INSTALL_REQUIRES = ["numpy", "networkx", "matplotlib", "pymoo", "pandas", "scikit-learn"]
 CLASSIFIERS = [
     "Development Status :: 4 - Beta",