mirror of
https://github.com/deepseek-ai/DeepSeek-Math
synced 2024-11-21 19:17:41 +00:00
87 lines
3.2 KiB
Python
87 lines
3.2 KiB
Python
# Prediction interface for Cog ⚙️
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# https://github.com/replicate/cog/blob/main/docs/python.md
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import os
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import time
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from threading import Thread
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import torch
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from transformers import AutoTokenizer, AutoModelForCausalLM, GenerationConfig
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from transformers.generation.streamers import TextIteratorStreamer
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from cog import BasePredictor, Input, ConcatenateIterator
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# Enable faster download speed
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os.environ["HF_HUB_ENABLE_HF_TRANSFER"] = "1"
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CACHE_DIR = "model_cache"
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class Predictor(BasePredictor):
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def setup(self) -> None:
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"""Load the model into memory to make running multiple predictions efficient"""
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model_name = "deepseek-ai/deepseek-math-7b-instruct"
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self.tokenizer = AutoTokenizer.from_pretrained(model_name, cache_dir=CACHE_DIR)
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self.model = AutoModelForCausalLM.from_pretrained(
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model_name,
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torch_dtype=torch.bfloat16,
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device_map="auto",
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cache_dir=CACHE_DIR,
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)
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self.model.generation_config = GenerationConfig.from_pretrained(
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model_name, cache_dir=CACHE_DIR
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)
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self.model.generation_config.pad_token_id = (
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self.model.generation_config.eos_token_id
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)
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def predict(
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self,
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text: str = Input(
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description="Input text.",
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default="what is the integral of x^2 from 0 to 2?\nPlease reason step by step, and put your final answer within \boxed{}.",
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),
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max_new_tokens: int = Input(
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description="The maximum numbers of tokens to generate, ignoring the number of tokens in the prompt.",
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default=100,
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),
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temperature: float = Input(
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description="The value used to modulate the next token probabilities.",
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default=1,
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),
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top_k: int = Input(
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description="The number of highest probability vocabulary tokens to keep for top-k-filtering.",
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default=50,
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),
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top_p: float = Input(
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description="If set to float < 1, only the smallest set of most probable tokens with probabilities that add up to top_p or higher are kept for generation.",
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default=0.9,
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),
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) -> ConcatenateIterator[str]:
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"""Run a single prediction on the model"""
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messages = [{"role": "user", "content": text}]
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input_tensor = self.tokenizer.apply_chat_template(
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messages, add_generation_prompt=True, return_tensors="pt"
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)
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streamer = TextIteratorStreamer(
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self.tokenizer, skip_prompt=True, skip_special_tokens=True
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)
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with torch.inference_mode():
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thread = Thread(
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target=self.model.generate,
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kwargs=dict(
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input_ids=input_tensor.to(self.model.device),
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do_sample=True,
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temperature=temperature,
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top_p=top_p,
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top_k=top_k,
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max_new_tokens=max_new_tokens,
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streamer=streamer,
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use_cache=True,
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),
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)
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thread.start()
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for new_token in streamer:
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yield new_token
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thread.join()
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