diff --git a/mindarmour/fuzzing/fuzzing.py b/mindarmour/fuzzing/fuzzing.py
index 3b8bcfc612f2879a620c3a155177267f9bbee0ec..2acc08220409aedbaacaf2daf82e46bc097705ea 100644
--- a/mindarmour/fuzzing/fuzzing.py
+++ b/mindarmour/fuzzing/fuzzing.py
@@ -117,21 +117,21 @@ class Fuzzer:
                                         'Noise']
         self._attacks_list = ['FGSM', 'PGD', 'MDIIM']
         self._attack_param_checklists = {
-            'FGSM': {'params': {'eps': {'dtype': [float, int], 'range': [0, 1]},
-                                'alpha': {'dtype': [float, int],
+            'FGSM': {'params': {'eps': {'dtype': [float], 'range': [0, 1]},
+                                'alpha': {'dtype': [float],
                                           'range': [0, 1]},
-                                'bounds': {'dtype': [list, tuple]}}},
-            'PGD': {'params': {'eps': {'dtype': [float, int], 'range': [0, 1]},
-                               'eps_iter': {'dtype': [float, int],
-                                            'range': [0, 1e5]},
-                               'nb_iter': {'dtype': [float, int],
+                                'bounds': {'dtype': [tuple]}}},
+            'PGD': {'params': {'eps': {'dtype': [float], 'range': [0, 1]},
+                               'eps_iter': {'dtype': [float],
+                                            'range': [0, 1]},
+                               'nb_iter': {'dtype': [int],
                                            'range': [0, 1e5]},
-                               'bounds': {'dtype': [list, tuple]}}},
+                               'bounds': {'dtype': [tuple]}}},
             'MDIIM': {
-                'params': {'eps': {'dtype': [float, int], 'range': [0, 1]},
+                'params': {'eps': {'dtype': [float], 'range': [0, 1]},
                            'norm_level': {'dtype': [str]},
-                           'prob': {'dtype': [float, int], 'range': [0, 1]},
-                           'bounds': {'dtype': [list, tuple]}}}}
+                           'prob': {'dtype': [float], 'range': [0, 1]},
+                           'bounds': {'dtype': [tuple]}}}}
 
     def fuzzing(self, mutate_config, initial_seeds, coverage_metric='KMNC',
                 eval_metrics='auto', max_iters=10000, mutate_num_per_seed=20):
diff --git a/mindarmour/fuzzing/image_transform.py b/mindarmour/fuzzing/image_transform.py
index 77ff6d01c0faa95a3046ae540bbf621e5dbdff85..0ba0f1fb50b9f4a8dcb052287a0d41c9eb3d136f 100644
--- a/mindarmour/fuzzing/image_transform.py
+++ b/mindarmour/fuzzing/image_transform.py
@@ -350,8 +350,10 @@ class Translate(ImageTransform):
     Translate an image.
 
     Args:
-        x_bias ([int, float): X-direction translation, x=x+x_bias. Default: 0.
-        y_bias ([int, float): Y-direction translation, y=y+y_bias. Default: 0.
+        x_bias ([int, float): X-direction translation, x=x+x_bias*image_length.
+            Default: 0.
+        y_bias ([int, float): Y-direction translation,  y=y+y_bias*image_wide.
+            Default: 0.
     """
 
     def __init__(self, x_bias=0, y_bias=0):
@@ -363,8 +365,10 @@ class Translate(ImageTransform):
         Set translate parameters.
 
         Args:
-            x_bias ([float, int]): X-direction translation, x=x+x_bias. Default: 0.
-            y_bias ([float, int]): Y-direction translation, y=y+y_bias. Default: 0.
+            x_bias ([float, int]): X-direction translation, x=x+x_bias*image_length.
+                Default: 0.
+            y_bias ([float, int]): Y-direction translation, y=y+y_bias*image_wide.
+                Default: 0.
             auto_param (bool): True if auto generate parameters. Default: False.
         """
         self.auto_param = auto_param