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Updated weekly · Last refresh Aug 30

Didi Chuxing Machine Learning Engineer Interview Questions

The questions to prepare for a Didi Chuxing Machine Learning Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
Model EvaluationStart here. 4 questions · ~33 min
Monitor Production Model DriftMedium

Design a drift monitoring plan for a conversion model whose AUC fell from 0.84 to 0.76 and calibration worsened in production.

CalibrationAccuracyThreshold TuningDidi Chuxing
Debug Training to Production GapHard

Approach for debugging a model that looks strong offline but fails after deployment.

Cross-ValidationCalibrationPrecisionDidi Chuxing
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2
Machine Learning13 questions · ~109 min
Select Models for CTR PredictionMedium

Compare regularized linear and tree-based models for ad CTR prediction, using bias-variance tradeoffs to guide model selection.

Cross-ValidationBias-Variance TradeoffRegularizationDidi Chuxing
Describe an ML ProjectEasy

Walk through a real supervised learning project, from problem framing and feature engineering to validation and model evaluation.

Cross-ValidationFeature EngineeringSupervised LearningDidi Chuxing
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3
Coding14 questions · ~117 min
Two Pointers on Arrays and StringsEasy

Explain how the two pointers technique works on arrays and strings, when to use it, and its common patterns.

ArraysStringsTwo PointersDidi Chuxing
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4
Pipelines14 questions · ~117 min
Production ML Deployment PipelineMedium

Key production pipeline considerations for deploying, validating, and monitoring an ML model.

InfrastructureIdempotencyQualityDidi Chuxing
Data Quality in ML PipelinesMedium

Practical approach for maintaining data quality across ML ETL pipelines, orchestration, and repeatable data processing.

Data QualityETLData ModelingDidi Chuxing
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5
Statistics & Probability3 questions · ~25 min
Sample Size and Power PlanningMedium

Reason about sample size, power, and minimum detectable effect before launching an experiment.

Hypothesis TestingPower AnalysisSample SizeDidi Chuxing
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6
More topics2 questions · ~17 min
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