update readme

README.md

@@ -17,24 +17,32 @@ Search embedding in [Milvus](https://milvus.io/), **please make sure you have in
 
 
 ```python
-from towhee.dc2 import pipe, ops
+from towhee.dc2 import pipe, ops, DataCollection
+
+p = pipe.input('text')  \
+    .map('text', 'vec', ops.sentence_embedding.transformers(model_name='all-MiniLM-L12-v2'))  \
+    .flat_map('vec', 'rows', ops.ann_search.milvus_client(host='127.0.0.1', port='19530', collection_name='text_db2', **{'output_fields': ['text']}))  \
+    .map('rows', ('id', 'score', 'text'), lambda x: (x[0], x[1], x[2]))  \
+    .output('id', 'score', 'text')
 
-p = pipe.input('vec') \
-    .map('vec', ('id', 'score'), ops.ann_search.milvus_client(host='127.0.0.1', port='19530', collection_name='textdb')) \
-    .output('id', 'score')
+DataCollection(p('cat')).show()
+
+# result:
 
-# call pipeline
-p(vec_data)
 ```
 
 ```python
 from towhee.dc2 import pipe, ops
 
 # search additional info url:
+from towhee.dc2 import pipe, ops, DataCollection
+
+p = pipe.input('text')  \
+    .map('text', 'vec', ops.sentence_embedding.transformers(model_name='all-MiniLM-L12-v2'))  \
+    .map('vec', 'rows', ops.ann_search.milvus_client(host='127.0.0.1', port='19530', collection_name='text_db2', **{'output_fields': ['text']}))  \
+    .output('rows')
 
-p = pipe.input('vec') \
-    .map('vec', ('id', 'score', 'url'), ops.ann_search.milvus_client(host='127.0.0.1', port='19530', collection_name='textdb', output_fields=['url'])) \
-    .output('id', 'score', 'url')
+DataCollection(p('cat')).show()
 ```
 
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