Update readme

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

README.md

@@ -59,9 +59,9 @@ p = (
     pipe.input('question', 'docs', 'history')
         .map(('question', 'docs', 'history'),
              'prompt',
-             ops.prompt.template(temp, ['question', 'context'], sys_message))
+             ops.prompt.template(temp, ['question', 'context'], system_msg))
         .map('prompt', 'answer',
-             ops.LLM.Llama_2(max_tokens=200))
+             ops.LLM.Llama_2(temperature=0))
         .output('answer')
 )
 
@@ -72,7 +72,7 @@ print(q1, ans1)
 
 history.append((q1, ans1))
 docs.append('Towhee is a cutting-edge framework designed to streamline the processing of unstructured data through the use of Large Language Model (LLM) based pipeline orchestration.')
-ans2 = p(q2, docs, history)
+ans2 = p(q2, docs, history).get()[0]
 
 print(q2, ans2)
 ```

__init__.py

@@ -1,5 +1,5 @@
 from .llama2 import LlamaCpp
 
 
-def llama_2(*args, **kwargs):
+def Llama_2(*args, **kwargs):
     return LlamaCpp(*args, **kwargs)

llama2.py

@@ -39,7 +39,6 @@ class LlamaCpp(PyOperator):
             self.model_path = model_name_or_file
         assert os.path.isfile(self.model_path), f'Invalid model path: {self.model_path}'
 
-        print(111, self.model_path)
         self.model = Llama(model_path=self.model_path)
 
     def __call__(self, messages: List[dict]):
@@ -52,7 +51,7 @@ class LlamaCpp(PyOperator):
         assert isinstance(messages, list), \
             'Inputs must be a list of dictionaries with keys from ["system", "question", "answer"].'
         prompt = ''
-        question = messages.pop[-1]
+        question = messages.pop(-1)
         assert len(question) == 1 and 'question' in question.keys()
         question = question['question']
         for m in messages: