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To illustrate the random token replacement strategy in BERT's Masked Language Modeling, consider the original two-sentence input: `[CLS] It is raining . [SEP] I need an umbrella . [SEP]`. If the token 'umbrella' is selected for modification under the 10% random replacement rule, it is substituted with a random token from the vocabulary, such as 'hat'. This results in the modified sequence: `[CLS] It is raining . [SEP] I need an hat . [SEP]`. The model's task is then to predict the original word 'umbrella' from this corrupted input.

Example of Random Token Replacement in a BERT Input Sequence

Based on the training approach described in the case study, what is the primary purpose of intentionally replacing a correct word (like 'meal') with a random, incorrect word (like 'bicycle')? Explain how this helps the model learn.

Analyzing a Language Model's Training Method

A language model is being trained on the sentence: `The chef prepared a delicious meal.` During one training step, the input is modified to: `The chef prepared a delicious apple.` Explain what the model is expected to predict for the position of the word 'apple' and why this specific modification technique is used.

Analyzing a Corrupted Input Sequence

A language model is being trained using a technique where some words in the input are altered to help the model learn. Consider the original input sequence: `[CLS] My dog chased the ball . [SEP] He brought it back . [SEP]`. If the token 'ball' is selected to be replaced by a random word from the model's vocabulary, which of the following represents the most likely resulting sequence?

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