update the readme.

Signed-off-by: wxywb <xy.wang@zilliz.com>

README.md

@@ -17,42 +17,31 @@ This operator extracts features for image or text with [SLIP](https://arxiv.org/
 
 ## Code Example
 
-Load an image from path './teddy.jpg' to generate an image embedding. 
+Load an image from path './moon.jpg' to generate an image embedding. 
 
-Read the text 'A teddybear on a skateboard in Times Square.' to generate an text embedding. 
+Read the text 'moon in the night.' to generate a text embedding. 
 
- *Write the pipeline in simplified style*:
+*Write a pipeline with explicit inputs/outputs name specifications:*
 
 ```python
-import towhee
+from towhee.dc2 import pipe, ops, DataCollection
 
-towhee.glob('./moon.jpeg') \
-      .image_decode() \
-      .image_text_embedding.slip(model_name='slip_vit_small', modality='image') \
-      .show()
+img_pipe = (
+    pipe.input('url')
+    .map('url', 'img', ops.image_decode.cv2_rgb())
+    .map('img', 'vec', ops.image_text_embedding.slip(model_name='slip_vit_small', modality='image'))
+    .output('img', 'vec')
+)
 
-towhee.dc(['moon in the night.']) \
-      .image_text_embedding.slip(model_name='slip_vit_small', modality='text') \
-      .show()
-```
-<img src="./vec1.png" alt="result1" style="height:20px;"/>
-<img src="./vec2.png" alt="result2" style="height:20px;"/>
+text_pipe = (
+    pipe.input('text')
+    .map('text', 'vec', ops.image_text_embedding.slip(model_name='slip_vit_small', modality='text'))
+    .output('text', 'vec')
+)
 
-*Write a same pipeline with explicit inputs/outputs name specifications:*
+DataCollection(img_pipe('./moon.jpg')).show()
+DataCollection(text_pipe('moon in the night.')).show()
 
-```python
-import towhee
-
-towhee.glob['path']('./moon.jpeg') \
-      .image_decode['path', 'img']() \
-      .image_text_embedding.slip['img', 'vec'](model_name='slip_vit_small', modality='image') \
-      .select['img', 'vec']() \
-      .show()
-
-towhee.dc['text'](['moon in the night.']) \
-      .image_text_embedding.slip['text','vec'](model_name= 'slip_vit_small', modality='text') \
-      .select['text', 'vec']() \
-      .show()
 ```
 <img src="./tabular1.png" alt="result1" style="height:60px;"/>
 <img src="./tabular2.png" alt="result2" style="height:60px;"/>