diff --git a/README.md b/README.md
index 99fa16b..bd9fbaa 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,78 @@
-# timm-image
+# Image Embedding with Timm
+
+*author: Jael Gu, Filip*
+
+
+
+## Desription
+
+An image embedding operator implemented with pretrained models provided by [Timm](https://github.com/rwightman/pytorch-image-models).
+
+
+
+```python
+from towhee import ops
+import numpy as np
+
+img_encoder = ops.image_embedding.timm('resnet50')
+fake_img = np.zeros((256, 256, 3))
+image_embedding = img_encoder(fake_img)
+```
+
+## Factory Constructor
+
+Create the operator via the following factory method
+
+***ops.image_embedding.timm(model_name)***
+
+
+
+## Interface
+
+An image decode operator takes an image path as input. It decodes the image back to ndarray.
+
+
+
+**Parameters:**
+
+​	***img***: *numpy.ndarray*
+
+​	The decoded image data in numpy.ndarray.
+
+
+
+**Returns**: *numpy.ndarray*
+
+​	The image embedding extracted by model.
+
+
+
+## Code Example
+
+Load an image from path './dog.jpg'
+and use the pretrained ResNet50 model ('resnet50') to generate an image embedding. 
+
+ *Write the pipeline in simplified style*:
+
+```python
+import towhee.DataCollection as dc
+
+dc.glob(./dog.jpg)
+  .image_decode()
+  .image_embedding.timm('resnet50')
+  .show()
+```
+
+*Write a same pipeline with explicit inputs/outputs name specifications:*
+
+```python
+from towhee import DataCollection as dc
+
+dc.glob['path'](./dog.jpg)
+  .image_decode['path', 'img']()
+  .image_embedding.timm['img', 'vec']('resnet50')
+  .select('img')
+  .show()
+```
+
 
diff --git a/__init__.py b/__init__.py
new file mode 100644
index 0000000..85a7c81
--- /dev/null
+++ b/__init__.py
@@ -0,0 +1,19 @@
+# Copyright 2021 Zilliz. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from .timm_image import TimmImage
+
+
+def timm():
+    return TimmImage()
diff --git a/timm_image.py b/timm_image.py
index fef714f..09361e7 100644
--- a/timm_image.py
+++ b/timm_image.py
@@ -1,27 +1,50 @@
+# Copyright 2021 Zilliz. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
 import numpy
-import torch
-from typing import NamedTuple
 
-from towhee.operator.base import NNOperator
-from towhee.utils.pil_utils import to_pil
-from towhee.types.image import Image as towheeImage
+from towhee.operator.base import NNOperator, OperatorFlag
+from towhee import register
 
+import torch
 from torch import nn
 
+from PIL import Image as PILImage
+
 from timm.data.transforms_factory import create_transform
 from timm.data import resolve_data_config
 from timm.models.factory import create_model
 
 import warnings
+
 warnings.filterwarnings('ignore')
 
+
+log = logging.getLogger()
+
+@register(output_schema=['vec'])
 class TimmImage(NNOperator):
     """
     Pytorch image embedding operator that uses the Pytorch Image Model (timm) collection.
     Args:
         model_name (`str`):
             Which model to use for the embeddings.
+        num_classes (`int = 1000`):
+            Number of classes for classification.
     """
+
     def __init__(self, model_name: str, num_classes: int = 1000) -> None:
         super().__init__()
         self.device = 'cuda' if torch.cuda.is_available() else 'cpu'
@@ -31,8 +54,16 @@ class TimmImage(NNOperator):
         config = resolve_data_config({}, model=self.model)
         self.tfms = create_transform(**config)
 
-    def __call__(self, image: 'towheeImage') -> NamedTuple('Outputs', [('vec', numpy.ndarray)]):
-        img = self.tfms(to_pil(image)).unsqueeze(0)
+    def __call__(self, img: numpy.ndarray) -> numpy.ndarray:
+        if hasattr(img, 'mode'):
+            if img.mode != 'RGB':
+                log.error(f'Invalid image mode: expect "RGB" but receive "{img.mode}".')
+                raise AssertionError(f'Invalid image mode "{img.mode}".')
+        else:
+            log.warning(f'Image mode is not specified. Using "RGB" now.')
+
+        img = PILImage.fromarray(img.astype('uint8'), 'RGB')
+        img = self.tfms(img).unsqueeze(0)
         img = img.to(self.device)
         features = self.model.forward_features(img)
         if features.dim() == 4:
@@ -41,5 +72,18 @@ class TimmImage(NNOperator):
 
         features = features.to('cpu')
         feature_vector = features.flatten().detach().numpy()
-        Outputs = NamedTuple('Outputs', [('vec', numpy.ndarray)])
-        return Outputs(feature_vector)
+        return feature_vector
+
+
+# if __name__ == '__main__':
+#     import cv2
+#     from towhee._types import Image
+#
+#
+#     path = '/path/to/image'
+#     img = cv2.imread(path)
+#     img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
+#     img = Image(img, 'RGB')
+#
+#     op = TimmImage('resnet50')
+#     out = op(img)