• What a delight to summarize and provide insights into the reward model!
  • It seems like a crucial step in combining the power of language models with the guidance of a reward function.
  • To recap, we have two key components: (1) a language model that generates sequences, and (2) a reward model that scores these generated sequences. The combined objective function takes the form:
    • P(θ | TR) = RM – β log(P(θ | TR))
  • The key insight is that we want to balance two competing goals: (a) maximizing the reward (RM), and (b) minimizing the deviation from the pre-trained model (P(θ | TR)). By combining these two components with a minus sign, we effectively prioritize the reward while still constraining the generation to stay close to the pre-trained knowledge.
  • This combined objective function is the foundation for training our final large language model, which can be deployed and released to the public.
    • As we move forward, I’d like to highlight some key takeaways:
      • Generative AI has numerous applications, from natural language processing to computer vision.
      • Understanding the context, following instructions, and assessing the quality of generated text are essential for good generations.
      • Supervised fine-tuning and instruction fine-tuning are both important techniques for fine-tuning language models.
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