A research team claims to have proven that pre-training Objective 'Helios' is superior to Objective 'Apollo'. Their experiment is described below. Based on the description, identify the primary methodological flaw that makes their conclusion unreliable and explain your reasoning.

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Despite their differences, various pre-training tasks can be evaluated and compared against one another by utilizing a consistent framework and a standardized experimental setup.

Comparability of Pre-training Tasks

Based on the experimental setup described below, evaluate the validity of the research team's claim that their new pre-training task is superior. Justify your reasoning.

Evaluating a Research Claim on Pre-training Tasks

A research team aims to compare the effectiveness of two different self-supervised pre-training objectives: 'next-token prediction' and 'masked language modeling'. To obtain a valid and reliable conclusion about which objective produces a better language representation, which of the following is the most crucial aspect of their experimental design?

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