Table 4 Analysis of model prediction failures and proposed improvements.

From: Innovative framework for fault detection and system resilience in hydropower operations using digital twins and deep learning

Failure case

Identified cause

Proposed improvement

High-magnitude errors

Underrepresented system states in training data

Data augmentation, rebalancing, and adaptive learning techniques

Misclassification in boundary cases

Model struggles with transition states

Feature engineering to highlight boundary conditions

Temporal drift in predictions

Accumulation of minor errors in sequential forecasting

Improved recurrent architectures (e.g., Transformer-based models)

Sensitivity to sensor noise

Presence of faulty or noisy input data

Robust filtering techniques and anomaly detection

Overfitting to common patterns

Model biases towards dominant trends in training data

Regularization techniques and hybrid statistical-domain models

Uncertainty in rare event detection

Insufficient training examples for rare critical events

Uncertainty quantification and confidence interval estimation