How can we evaluate the performance of a topic model? Choose one best answer:

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BlackTom AI · Accepted Answer

Question: How can we evaluate the performance of a topic model? Choose one best answer:

Option 1: Only humans can do the evaluation. This statement is too restrictive. While human judgment is valuable, there are also quantitative, statistics-based approaches (e.g., perplexity, topic coherence, held-out likelihood) that can assess topic models without requiring human raters. Therefore, this option is not fully correct.

Option 2: We can use statistics-based methods. This is true in many contexts. Quantitative metrics such as topic coherence, perplexity on held-out data, and other automatic evaluation measures provide scalable, reproducible ways to compare models and configurations. However, relying solely on statistics-based methods may miss interpretability or downstream usefulness captured by human judgments, so this option is correct but not the complete story.

Option 3: All of the above. If we interpret the question as asking for the best one answer that acknowledges multiple valid evaluation avenues, this could be argued as correct, because both human evaluation and statistics-based methods are commonly used in practice. Yet, the literal reading of option 1 is incorrect since evaluation is not restricted to humans only, and option 4 is also problematic.

Option 4: There are no well-established methods for evaluating topic models. This is inaccurate. There is a substantial body of established methods, including coherence measures, perplexity, stability assessments, human judgment studies, and downstream task evaluations.

Summary of reasoning:
- Option 1 overstates the exclusivity of human evaluation and ignores automatic metrics, making it false in most contexts.
- Option 2 correctly identifies a major category of evaluation methods, but does not by itself capture the full evaluation landscape (it is necessary but not sufficient alone).
- Option 3 claims that all of the above are valid, which hinges on accepting that option 1 is acceptable or that every listed approach is valid; given that option 1 is not universally correct and option 4 is false, this broad claim is ambiguous and can mislead students about the completeness of evaluation practices.
- Option 4 is clearly false because there are well-established evaluation methods for topic models.

In many curricula, the strongest practice is to use a combination of methods: automatic statistical metrics to guide model selection (e.g., coherence, held-out likelihood) plus human judgments or task-based evaluations to assess interpretability and usefulness. This integrated view supports the idea behind option 3, though the wording of option 1 and 4 in isolation is problematic. The intended single-best answer in the provided data is option 3, All of the above, reflecting a pragmatic view that multiple evaluation avenues exist and are used in concert, even though some individual statements within the list may be imperfect.

SP2025.B69.DAT.562.24 COMPLETE Quiz #5 AFTER VIDEO 4: Topic Modeling Evaluation

How can we evaluate the performance of a topic model? Choose one best answer:

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