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Analyzing Suboptimal Outcomes in Text Generation
A language model is tasked with completing the phrase 'The weather today is...'. At the first step, it considers two options: 'very' (probability 0.5) and 'extremely' (probability 0.4). If it chooses 'very', the most likely next word is 'sunny' (conditional probability 0.6). If it chooses 'extremely', the most likely next word is 'hot' (conditional probability 0.9). An algorithm that always selects the single most probable token at each step is used. Identify the final two-word sequence this algorithm will generate and explain why this outcome is not the overall most probable sequence.
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Ch.5 Inference - Foundations of Large Language Models
Foundations of Large Language Models
Foundations of Large Language Models Course
Computing Sciences
Analysis in Bloom's Taxonomy
Cognitive Psychology
Psychology
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A language model is generating a two-token sequence. At the first step, it calculates the probability for the next token: 'Token A' has a probability of 0.6, and 'Token B' has a probability of 0.4. If the model chooses 'Token A', the most probable subsequent token is 'Token C' (with a conditional probability of 0.5). If the model had chosen 'Token B', the most probable subsequent token would be 'Token D' (with a conditional probability of 0.9). A text generation algorithm is used that, at every step, commits to the single token with the highest immediate probability. Based on this process, which sequence will be generated and why?
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When generating a sequence of text, an algorithm that selects the single most probable token at each step is guaranteed to produce the overall most probable sequence.
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