Exploring the Synergy of AI & Data Science: Questions for Enthusiasts

Question

What role does feature engineering still play in the age of automated ML and large language models?

Deepika Sawant · Answer

Feature engineering remains essential in the age of AutoML and large language models (LLMs), especially for structured/tabular data, domain-specific tasks, and interpretability. While automation has reduced manual effort, human-guided feature design still drives performance and trust. Feature engineering plays a pivotal role in the success of ML models by transforming raw data into meaningful inputs that improve model accuracy and efficiency. Why Feature Engineering Still Matters Even with AutoML and LLMs transforming ML workflows, feature engineering continues to play a critical role in several areas: 1. Structured Data Dominance AutoML tools like Google AutoML, H2O, and Azure ML automate feature selection and transformation, but domain-specific insights often outperform generic pipelines . In tabular data (e.g., finance, healthcare), manual feature creation—like ratios, flags, or aggregations—can dramatically improve model accuracy . 2. LLMs and Feature Reasoning LLMs are being used to generate features from raw data using reasoning , as seen in frameworks like FeRG-LLM (Feature Engineering by Reason Generation). These models can suggest transformations, encode domain logic, and even simulate expert intuition—but they still rely on human validation and context . 3. Interpretability and Trust Manually engineered features are often more interpretable , helping stakeholders understand model decisions. This is crucial in regulated industries (e.g., insurance, banking) where explainability is non-negotiable . 4. Edge Cases and Data Quality Automated systems may miss rare patterns, outliers, or noisy signals that a domain expert can capture through custom features. Feature engineering also helps clean and normalize data , which is foundational for any ML pipeline. How Feature Engineering Is Evolving Traditional Role Modern Role with AutoML & LLMs Manual transformations LLM-assisted feature generation (e.g., FeRG-LLM) Domain-driven feature selection Prompt-driven reasoning and suggestions Encoding categorical variables Embedding-based representations Feature scaling and normalization Auto-preprocessing pipelines Interpretability via feature names Explainability via model introspection

Exploring the Synergy of AI & Data Science: Questions for Enthusiasts

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