Q1. What is MLOps, and why is it important in data science?
MLOps is the practice of applying DevOps principles to machine learning workflows. It integrates data preparation, model training, deployment, monitoring, and automation.
MLOps ensures models move from experimentation to production reliably. It improves collaboration between data scientists and engineers. It also reduces deployment time and increases model stability.
Q2. What does a typical ML pipeline look like in MLOps?
A standard ML pipeline includes data ingestion, preprocessing, model training, validation, deployment, and monitoring.
Each step can be automated using MLOps tools. Pipelines ensure reproducibility and reduce manual errors. They help maintain consistency across environments.
Automated pipelines speed up continuous integration and continuous delivery for ML models.
Q3. How does CI/CD apply to machine learning workflows?
In ML, CI/CD means automating code testing, model validation, and deployment. Continuous Integration checks model code, data schema, and training scripts.
Continuous Delivery automates pushing trained models to staging or production.
CI/CD reduces the risk of broken pipelines. It ensures updates are tested and deployed quickly.
Q4. Why is monitoring important in MLOps?
Monitoring tracks model performance, data drift, and system health after deployment. It detects when a model’s predictions degrade over time.
Monitoring tools generate alerts when anomalies or drift occur. This ensures the model remains accurate in changing environments.
It is essential for maintaining trust and reliability in live ML systems.
Q5. Compare DevOps and MLOps.
| Feature | DevOps | MLOps |
| Focus | Software delivery | Model lifecycle + data |
| Inputs | Code | Code + data + models |
| Changes | Frequent code updates | Frequent retraining |
| Tools | Jenkins, Docker | MLflow, Kubeflow, TFX |
MLOps extends DevOps to handle data pipelines, model retraining, and monitoring.
Q6. Compare model training and model serving.
| Stage | Purpose | Output |
| Training | Learn patterns from data | Model artifact |
| Serving | Provide predictions | API or batch output |
| Frequency | Occasional | Continuous |
| Requirements | Compute intensive | Low latency |
Training builds the model; serving makes it usable in real systems.
Q7. Compare batch inference and real-time inference.
| Type | Use Case | Speed | Tools |
| Batch | Large offline predictions | Slower | Spark, Airflow |
| Real-Time | Instant predictions | Fast, low-latency | FastAPI, TensorFlow Serving |
The right type depends on business needs and system performance requirements.
Q8. Compare model drift and data drift.
| Drift Type | Meaning | Example |
| Data Drift | Input data changes | New customer behavior |
| Model Drift | Model performance drops | Accuracy decreases over time |
| Cause | Environment shift | Outdated parameters |
Both drifts require monitoring and retraining strategies.
Q9. What is model versioning in MLOps?
Model versioning tracks different versions of ML models, allowing rollback and comparison. Tools like MLflow, DVC, and Git maintain versions of artifacts.
Versioning ensures reproducibility and traceability. It helps teams manage experiments efficiently. It is critical for production deployments.
Q10. What is feature store, and why is it used?
A feature store centralizes the storage and serving of ML features. It ensures consistent features across training and inference.
Feature stores improve reusability and reduce duplication. They support real-time and batch serving. Examples include Feast and Tecton.
Q11. What is model registry in MLOps?
A model registry stores trained models along with metadata, versions, and approval status. It acts as a central hub for deployment-ready models. Registries track experiment metrics and lineage.
MLflow and Azure ML provide built-in registries. It simplifies model promotion from development to production.
Q12. What is data pipeline orchestration?
Orchestration coordinates tasks like preprocessing, training, and deployment. Tools such as Airflow, Prefect, and Kubeflow Pipelines automate workflows. Orchestration ensures steps run in the correct order. It also enables retries, scheduling, and monitoring. Reliable orchestration is key for automated MLOps pipelines.
Q13. What is containerization, and how is it used in MLOps?
Containerization packages code, dependencies, and environment into portable units using Docker. It ensures models run consistently across machines.
Containers simplify deployment and scaling. They work with Kubernetes for automated cluster management. Containers are essential for reproducible ML environments.
Q14. What is Kubernetes’s role in MLOps?
Kubernetes manages containerized ML workloads. It handles scaling, load balancing, and availability. Kubernetes supports model serving platforms like KFServing and Seldon.
It automates resource allocation for training jobs. Kubernetes is the backbone of modern production ML systems.
Q15. What is MLflow, and why is it popular?
MLflow is an open-source tool for experiment tracking, model packaging, and deployment. It supports model registry, parameter logging, and artifact storage.
MLflow integrates easily with Python ML libraries. It standardizes ML workflows across teams. Many companies use MLflow as their core MLOps system.
Q16. What are the main challenges in deploying ML models?
Challenges include data drift, dependency conflicts, latency constraints, and scaling issues. Deployment also requires ensuring reproducibility and monitoring. Integration with business systems can be complex. MLOps frameworks help mitigate these challenges. Continuous improvement is necessary for stable deployments.
Q17. What is automated model retraining?
Automated retraining triggers model updates when drift or performance drop is detected. Pipelines fetch new data, retrain models, validate them, and redeploy if approved.
This reduces manual intervention and ensures the model remains accurate. Automated retraining is essential for dynamic, real-world environments.
Q18. What is experiment tracking?
Experiment tracking records model hyperparameters, metrics, code versions, and datasets. It helps compare different runs and select the best model.
Tools like MLflow, Weights & Biases, and DVC provide tracking dashboards. Experiment tracking improves collaboration and reproducibility. It is critical for scientific model development.
Q19. What is model explainability, and why does it matter?
Explainability helps understand how models make decisions. Tools like SHAP and LIME reveal feature importance. It is important for trust, fairness, and compliance. Many industries require transparent models for auditing. Explainability helps debug and improve model behavior.
Q20. Why do ML systems need logging and alerting?
Logging tracks predictions, errors, and system events. Alerting notifies teams when issues like drift or failures occur. These mechanisms ensure quick response to production problems. Logging supports audit trails and debugging. It is a core component of MLOps reliability.





