AI0-001 Implementing AI Solutions Practice Question
A data scientist is preparing a dataset for a text classification model. To prevent train/test leakage, which THREE practices should they follow?
⚠ Common exam trap
The AI0-001 exam often tests the misconception that shuffling the entire dataset is always safe, but for temporal data or when duplicates exist, shuffling can introduce leakage by mixing future and past samples or spreading identical text across train and test sets.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use time-based splitting for temporal data
Time-based splitting preserves the temporal order of data, which is critical for time-series or temporal text data to prevent the model from learning from future information that would not be available at inference time. This avoids train/test leakage where future data leaks into the training set, artificially inflating model performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Shuffle the entire dataset before splitting to ensure randomness
Why it's wrong here
Shuffling is fine but does not prevent leakage if duplicates or related samples exist across splits.
- ✓
Use time-based splitting for temporal data
Why this is correct
For time-series or evolving data, splitting by time ensures the model is not trained on future information.
- ✓
Perform train/test split before any data cleaning or normalization
Why this is correct
Splitting first ensures that no information from the test set influences preprocessing (e.g., mean/variance).
- ✗
Apply feature scaling to the entire dataset before splitting
Why it's wrong here
Scaling before splitting leaks global statistics (e.g., min, max) from test into training.
- ✓
Remove duplicate samples and ensure that no text from the same document appears in both sets
Why this is correct
Deduplication prevents the same content from being in both training and test sets.
About these practice questions
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AI0-001 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AI0-001 exam.