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| """ | |
| This file implements prompt template for llama based models. | |
| Modify the prompt template based on the model you select. | |
| This seems to have significant impact on the output of the LLM. | |
| """ | |
| from langchain.memory import ConversationBufferMemory | |
| from langchain.prompts import PromptTemplate | |
| # this is specific to Llama-2. | |
| system_prompt = """You are a helpful assistant, you will use the provided context to answer user questions. | |
| Read the given context before answering questions and think step by step. If you can not answer a user question based on | |
| the provided context, inform the user. Do not use any other information for answering user. Provide a detailed answer to the question.""" | |
| def get_prompt_template(system_prompt=system_prompt, promptTemplate_type=None, history=False): | |
| if promptTemplate_type == "llama": | |
| B_INST, E_INST = "[INST]", "[/INST]" | |
| B_SYS, E_SYS = "<<SYS>>\n", "\n<</SYS>>\n\n" | |
| SYSTEM_PROMPT = B_SYS + system_prompt + E_SYS | |
| if history: | |
| instruction = """ | |
| Context: {history} \n {context} | |
| User: {question}""" | |
| prompt_template = B_INST + SYSTEM_PROMPT + instruction + E_INST | |
| prompt = PromptTemplate(input_variables=["history", "context", "question"], template=prompt_template) | |
| else: | |
| instruction = """ | |
| Context: {context} | |
| User: {question}""" | |
| prompt_template = B_INST + SYSTEM_PROMPT + instruction + E_INST | |
| prompt = PromptTemplate(input_variables=["context", "question"], template=prompt_template) | |
| elif promptTemplate_type == "mistral": | |
| B_INST, E_INST = "<s>[INST] ", " [/INST]" | |
| if history: | |
| prompt_template = ( | |
| B_INST | |
| + system_prompt | |
| + """ | |
| Context: {history} \n {context} | |
| User: {question}""" | |
| + E_INST | |
| ) | |
| prompt = PromptTemplate(input_variables=["history", "context", "question"], template=prompt_template) | |
| else: | |
| prompt_template = ( | |
| B_INST | |
| + system_prompt | |
| + """ | |
| Context: {context} | |
| User: {question}""" | |
| + E_INST | |
| ) | |
| prompt = PromptTemplate(input_variables=["context", "question"], template=prompt_template) | |
| else: | |
| # change this based on the model you have selected. | |
| if history: | |
| prompt_template = ( | |
| system_prompt | |
| + """ | |
| Context: {history} \n {context} | |
| User: {question} | |
| Answer:""" | |
| ) | |
| prompt = PromptTemplate(input_variables=["history", "context", "question"], template=prompt_template) | |
| else: | |
| prompt_template = ( | |
| system_prompt | |
| + """ | |
| Context: {context} | |
| User: {question} | |
| Answer:""" | |
| ) | |
| prompt = PromptTemplate(input_variables=["context", "question"], template=prompt_template) | |
| memory = ConversationBufferMemory(input_key="question", memory_key="history") | |
| return ( | |
| prompt, | |
| memory, | |
| ) | |