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Supervised Learning Algorithm Selection Questions

Covers selecting and comparing supervised machine learning algorithms for classification and regression tasks. Includes core algorithm families such as logistic regression, decision trees, random forests, gradient boosting implementations like XGBoost and LightGBM, support vector machines, and neural networks, as well as linear regression and regularization techniques including lasso, ridge, and elastic net. Candidates should be able to explain when each algorithm is appropriate based on interpretability requirements, dataset size, feature characteristics, computational constraints, training and inference latency, and robustness to noise and missing data. Also covers hyperparameter tuning, cross validation, bias variance trade offs, feature engineering impact, handling imbalanced classes, evaluation metrics for classification and regression, model calibration, and how to reason about theoretical foundations and senior level trade offs between algorithmic choices.

HardSystem Design
90 practiced
Discuss how you would factor in training vs inference cost when selecting between a heavy model (e.g., deep neural network) and a light model (e.g., logistic regression) for a feature-rich clickthrough-rate (CTR) prediction product with real-time serving and batch re-training nightly.
HardTechnical
86 practiced
You need to train a model with strict inference latency (<10ms per request) in a CPU-constrained environment. Candidate algorithms: logistic regression, small neural network, tree ensemble with 100 trees depth 6. Propose optimization and pruning strategies for each candidate to meet latency and maintain acceptable accuracy.
MediumTechnical
65 practiced
Explain the role of regularization hyperparameters (C in logistic regression, lambda in ridge) in controlling bias-variance. How would you search for optimal regularization strength in a production setting with limited compute?
HardTechnical
94 practiced
A stakeholder wants a model with human-interpretable coefficients and recommends logistic regression. You suspect nonlinear interactions. Describe a rigorous approach that keeps interpretability while capturing interactions, and how you'd present the trade-offs to stakeholders.
HardTechnical
71 practiced
Design a hyperparameter tuning strategy for LightGBM on a dataset with expensive training (one full training run ~2 hours). Include search algorithm, parallelization approach, and early-stopping rules to make efficient use of compute.

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