Parse output

Signed-off-by: Jael Gu <mengjia.gu@zilliz.com>

README.md

@@ -30,7 +30,7 @@ p = (
 
 history=[('Who won the world series in 2020?', 'The Los Angeles Dodgers won the World Series in 2020.')]
 question = 'Where was it played?'
-answer = p(question, [], history)
+answer = p(question, [], history).get()[0]
 ```
 
 <br />

hf_dolly.py

@@ -35,7 +35,7 @@ class HuggingfaceDolly(PyOperator):
     def __call__(self, messages: List[dict]):
         prompt = self.parse_inputs(messages)
         ans = self.pipeline(prompt)
-        return ans
+        return ans[0]['generated_text']
         
     def parse_inputs(self, messages: List[dict]):
         assert isinstance(messages, list), \
@@ -43,9 +43,8 @@ class HuggingfaceDolly(PyOperator):
         prompt = messages[-1]['question']
         history = ''
         for m in messages[:-1]:
-            for k, v in m.items():
-                line = k + ': ' + v + '\n'
-                history += line
+            for _, v in m.items():
+                history += v + '\n'
         return prompt + '\n' + history