add English Russian model.

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

README.md

@@ -17,27 +17,19 @@ More detail can be found in [ Helsinki-NLP/Opus-MT ](https://github.com/Helsinki
 Use the pre-trained model 'opus-mt-en-zh'
 to generate the Chinese translation for the sentence "Hello, world.".
 
-*Write the pipeline*:
+*Write a pipeline with explicit inputs/outputs name specifications:*
 
 ```python
-import towhee
+from towhee.dc2 import pipe, ops, DataCollection
 
-(
-    towhee.dc(["Hello, world."])
-          .machine_translation.opus_mt(model_name="opus-mt-en-zh")
+p = (
+    pipe.input('text')
+    .map('text', 'translation', ops.machine_translation.opus_mt(model_name='opus-mt-en-zh')) 
+    .output('text', 'translation')
 )
-```
-
-*Write a same pipeline with explicit inputs/outputs name specifications:*
 
-```python
-import towhee
+DataCollection(p('hello, world.')).show()
 
-(
-    towhee.dc['text'](["Hello, world."])
-          .machine_translation.opus_mt['text', 'vec'](model_name="opus-mt-en-zh")
-          .show()
-)
 ```
 
 <img src="./result.png" width="800px"/>
@@ -48,7 +40,7 @@ import towhee
 
 Create the operator via the following factory method:
 
-***machine_translatioin.opus_mt(model_name="opus-mt-en-zh")***
+***machine_translation.opus_mt(model_name="opus-mt-en-zh")***
 
 **Parameters:**
 
@@ -58,8 +50,12 @@ The model name in string.
 The default model name is "opus-mt-en-zh".
 
 Supported model names:
- - opus-mt-en-zh
+ - opus-mt-en-zh  
  - opus-mt-zh-en
+ - opus-tatoeba-en-ja
+ - opus-tatoeba-ja-en
+ - opus-mt-ru-en
+ - opus-mt-en-ru
 
 <br />
 

opus_mt.py

@@ -64,4 +64,13 @@ class OpusMT(NNOperator):
         configs['opus-tatoeba-ja-en'] = {}
         configs['opus-tatoeba-ja-en']['tokenizer'] = 'Helsinki-NLP/opus-tatoeba-ja-en'
         configs['opus-tatoeba-ja-en']['model'] = 'Helsinki-NLP/opus-tatoeba-ja-en'
+
+        configs['opus-mt-ru-en'] = {}
+        configs['opus-mt-ru-en']['tokenizer'] = 'Helsinki-NLP/opus-mt-ru-en'
+        configs['opus-mt-ru-en']['model'] = 'Helsinki-NLP/opus-mt-ru-en'
+
+        configs['opus-mt-en-ru'] = {}
+        configs['opus-mt-en-ru']['tokenizer'] = 'Helsinki-NLP/opus-mt-en-ru'
+        configs['opus-mt-en-ru']['model'] = 'Helsinki-NLP/opus-mt-en-ru'
+        
         return configs