gpt.py

from ..smp import *
import os
import sys
from .base import BaseAPI

APIBASES = {
    'OFFICIAL': 'https://api.openai.com/v1/chat/completions',
}


def GPT_context_window(model):
    length_map = {
        'gpt-4-1106-preview': 128000,
        'gpt-4-vision-preview': 128000,
        'gpt-4': 8192,
        'gpt-4-32k': 32768,
        'gpt-4-0613': 8192,
        'gpt-4-32k-0613': 32768,
        'gpt-3.5-turbo-1106': 16385,
        'gpt-3.5-turbo': 4096,
        'gpt-3.5-turbo-16k': 16385,
        'gpt-3.5-turbo-instruct': 4096,
        'gpt-3.5-turbo-0613': 4096,
        'gpt-3.5-turbo-16k-0613': 16385,
    }
    if model in length_map:
        return length_map[model]
    else:
        return 128000


class OpenAIWrapper(BaseAPI):

    is_api: bool = True

    def __init__(self,
                 model: str = 'gpt-3.5-turbo-0613',
                 retry: int = 5,
                 wait: int = 5,
                 key: str = None,
                 verbose: bool = True,
                 system_prompt: str = None,
                 temperature: float = 0,
                 timeout: int = 60,
                 api_base: str = None,
                 max_tokens: int = 1024,
                 img_size: int = 512,
                 img_detail: str = 'low',
                 **kwargs):

        self.model = model
        self.cur_idx = 0
        self.fail_msg = 'Failed to obtain answer via API. '
        self.max_tokens = max_tokens
        self.temperature = temperature

        if 'step-1v' in model:
            env_key = os.environ.get('STEPAI_API_KEY', '')
            if key is None:
                key = env_key
        else:
            env_key = os.environ.get('OPENAI_API_KEY', '')
            if key is None:
                key = env_key
            assert isinstance(key, str) and key.startswith('sk-'), (
                f'Illegal openai_key {key}. '
                'Please set the environment variable OPENAI_API_KEY to your openai key. '
            )
        self.key = key
        assert img_size > 0 or img_size == -1
        self.img_size = img_size
        assert img_detail in ['high', 'low']
        self.img_detail = img_detail
        self.timeout = timeout

        super().__init__(wait=wait, retry=retry, system_prompt=system_prompt, verbose=verbose, **kwargs)

        if api_base is None:
            if 'OPENAI_API_BASE' in os.environ and os.environ['OPENAI_API_BASE'] != '':
                self.logger.error('Environment variable OPENAI_API_BASE is set. Will use it as api_base. ')
                api_base = os.environ['OPENAI_API_BASE']
            else:
                api_base = 'OFFICIAL'

        assert api_base is not None

        if api_base in APIBASES:
            self.api_base = APIBASES[api_base]
        elif api_base.startswith('http'):
            self.api_base = api_base
        else:
            self.logger.error('Unknown API Base. ')
            sys.exit(-1)
        self.logger.info(f'Using API Base: {self.api_base}; API Key: {self.key}')

    # inputs can be a lvl-2 nested list: [content1, content2, content3, ...]
    # content can be a string or a list of image & text
    def prepare_inputs(self, inputs):
        input_msgs = []
        if self.system_prompt is not None:
            input_msgs.append(dict(role='system', content=self.system_prompt))
        has_images = np.sum([x['type'] == 'image' for x in inputs])
        if has_images:
            content_list = []
            for msg in inputs:
                if msg['type'] == 'text':
                    content_list.append(dict(type='text', text=msg['value']))
                elif msg['type'] == 'image':
                    from PIL import Image
                    img = Image.open(msg['value'])
                    b64 = encode_image_to_base64(img, target_size=self.img_size)
                    img_struct = dict(url=f'data:image/jpeg;base64,{b64}', detail=self.img_detail)
                    content_list.append(dict(type='image_url', image_url=img_struct))
            input_msgs.append(dict(role='user', content=content_list))
        else:
            assert all([x['type'] == 'text' for x in inputs])
            text = '\n'.join([x['value'] for x in inputs])
            input_msgs.append(dict(role='user', content=text))
        return input_msgs

    def generate_inner(self, inputs, **kwargs) -> str:
        input_msgs = self.prepare_inputs(inputs)
        temperature = kwargs.pop('temperature', self.temperature)
        max_tokens = kwargs.pop('max_tokens', self.max_tokens)

        context_window = GPT_context_window(self.model)
        max_tokens = min(max_tokens, context_window - self.get_token_len(inputs))
        if 0 < max_tokens <= 100:
            self.logger.warning(
                'Less than 100 tokens left, '
                'may exceed the context window with some additional meta symbols. '
            )
        if max_tokens <= 0:
            return 0, self.fail_msg + 'Input string longer than context window. ', 'Length Exceeded. '

        headers = {'Content-Type': 'application/json', 'Authorization': f'Bearer {self.key}'}
        payload = dict(
            model=self.model,
            messages=input_msgs,
            max_tokens=max_tokens,
            n=1,
            temperature=temperature,
            **kwargs)
        response = requests.post(self.api_base, headers=headers, data=json.dumps(payload), timeout=self.timeout * 1.1)
        ret_code = response.status_code
        ret_code = 0 if (200 <= int(ret_code) < 300) else ret_code
        answer = self.fail_msg
        try:
            resp_struct = json.loads(response.text)
            answer = resp_struct['choices'][0]['message']['content'].strip()
        except:
            pass
        return ret_code, answer, response

    def get_token_len(self, inputs) -> int:
        import tiktoken
        try:
            enc = tiktoken.encoding_for_model(self.model)
        except:
            enc = tiktoken.encoding_for_model('gpt-4')
        assert isinstance(inputs, list)
        tot = 0
        for item in inputs:
            if item['type'] == 'text':
                tot += len(enc.encode(item['value']))
            elif item['type'] == 'image':
                tot += 85
                if self.img_detail == 'high':
                    img = Image.open(item['value'])
                    npatch = np.ceil(img.size[0] / 512) * np.ceil(img.size[1] / 512)
                    tot += npatch * 170
        return tot


class GPT4V(OpenAIWrapper):

    def generate(self, message, dataset=None):
        return super(GPT4V, self).generate(message)