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# Copyright 2021 Zilliz. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
from typing import List
from huggingface_hub import hf_hub_download
from llama_cpp import Llama
from towhee.operator.base import PyOperator, SharedType
class LlamaCpp(PyOperator):
'''Wrapper of Dolly inference'''
def __init__(self,
model_name_or_file: str = 'llama-2-7b-chat',
**kwargs
):
self.kwargs = kwargs
supported_model_names = self.supported_model_names()
if model_name_or_file in supported_model_names:
model_info = supported_model_names[model_name_or_file]
hf_id = model_info['hf_id']
model_filename = model_info['filename']
self.model_path = hf_hub_download(repo_id=hf_id, filename=model_filename)
else:
self.model_path = model_name_or_file
assert os.path.isfile(self.model_path), f'Invalid model path: {self.model_path}'
self.model = Llama(model_path=self.model_path)
def __call__(self, messages: List[dict]):
prompt = self.parse_inputs(messages)
resp = self.model(prompt, **self.kwargs)
answer = self.parse_outputs(resp)
return answer
def parse_inputs(self, messages: List[dict]):
assert isinstance(messages, list), \
'Inputs must be a list of dictionaries with keys from ["system", "question", "answer"].'
prompt = ''
question = messages.pop(-1)
assert len(question) == 1 and 'question' in question.keys()
question = question['question']
for m in messages:
for k, v in m.items():
if k == 'system':
prompt += f'''[INST] <<SYS>> {v} <</SYS>>\n'''
elif k == 'question':
prompt += f''' {v} [/INST]\n'''
elif k == 'answer':
prompt += f''' {v} '''
else:
raise KeyError(f'Invalid key of message: {k}')
if len(prompt) > 0:
prompt = '<s> ' + prompt + ' </s>' + f'<s> [INST] {question} [/INST]'
else:
prompt = question
return prompt
def parse_outputs(self, response):
return response['choices'][0]['text']
@staticmethod
def supported_model_names():
models = {
'llama-2-7b-chat': {
'hf_id': 'TheBloke/Llama-2-7B-GGML',
'filename': 'llama-2-7b.ggmlv3.q4_0.bin'
},
'llama-2-13b-chat': {
'hf_id': 'TheBloke/Llama-2-13B-chat-GGML',
'filename': 'llama-2-13b-chat.ggmlv3.q4_0.bin'
}
}
return models
@property
def shared_type(self):
return SharedType.Shareable