diff --git a/gnes/encoder/image/base.py b/gnes/encoder/image/base.py
index 5d1d05a1..0b4612bb 100644
--- a/gnes/encoder/image/base.py
+++ b/gnes/encoder/image/base.py
@@ -74,7 +74,6 @@ def forward(self, x):
             self._device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
             self._model = self._model.to(self._device)
 
-    @batching
     def encode(self, img: List['np.ndarray'], *args, **kwargs) -> np.ndarray:
         import torch
         self._model.eval()
@@ -87,13 +86,21 @@ def _padding(img: List['np.ndarray']):
                    if im.shape[0] < max_lenth else im for im in img]
             return img, max_lenth
 
-        @batching
+        # for video
+        if len(img[0].shape) == 4:
+            img, max_lenth = _padding(img)
+        # for image
+        else:
+            max_lenth = -1
+
+        @batching(chunk_dim=max_lenth)
         def _encode(_, img: List['np.ndarray']):
             import copy
 
             if len(img[0].shape) == 4:
                 img_ = copy.deepcopy(img)
                 img_ = np.concatenate((list(img_[i] for i in range(len(img_)))), axis=0)
+
                 img_for_torch = np.array(img_, dtype=np.float32).transpose(0, 3, 1, 2)
             else:
                 img_for_torch = np.array(img, dtype=np.float32).transpose(0, 3, 1, 2)
@@ -110,17 +117,8 @@ def _encode(_, img: List['np.ndarray']):
                 result_npy.append(encodes.data.cpu().numpy())
 
             output = np.array(result_npy, dtype=np.float32)
-
-            if len(img[0].shape) == 4:
-                output = output.reshape((len(img), max_lenth, -1))
             return output
 
-        # for video
-        if len(img[0].shape) == 4:
-            padding_image, max_lenth = _padding(img)
-            output = _encode(self, padding_image)
-        # for image
-        else:
-            output = _encode(self, img)
+        output = _encode(self, img)
 
         return output
diff --git a/gnes/helper.py b/gnes/helper.py
index ae7f7444..0b202611 100644
--- a/gnes/helper.py
+++ b/gnes/helper.py
@@ -375,7 +375,7 @@ def pooling_torch(data_tensor, mask_tensor, pooling_strategy):
 
 def batching(func: Callable[[Any], np.ndarray] = None, *,
              batch_size: Union[int, Callable] = None, num_batch=None,
-             iter_axis: int = 0, concat_axis: int = 0):
+             iter_axis: int = 0, concat_axis: int = 0, chunk_dim=-1):
     def _batching(func):
         @wraps(func)
         def arg_wrapper(self, data, label=None, *args, **kwargs):
@@ -418,6 +418,9 @@ def arg_wrapper(self, data, label=None, *args, **kwargs):
             if len(final_result) and concat_axis is not None and isinstance(final_result[0], np.ndarray):
                 final_result = np.concatenate(final_result, concat_axis)
 
+            if chunk_dim != -1:
+                final_result = final_result.reshape((-1, chunk_dim, final_result.shape[1]))
+
             if len(final_result):
                 return final_result