# A Novel Hybrid Gradient-Based Optimizer and Grey Wolf Optimizer Feature Selection Method for Human Activity Recognition Using Smartphone Sensors

> Research article (Entropy, 2021) · cited 77× · AI/ML

**Wikidata**: [openalex:W3195795483](https://www.wikidata.org/wiki/openalex:W3195795483)  
**Source**: https://4ort.xyz/entity/a-novel-hybrid-gradient-based-optimizer-and-grey-wolf-optimizer-feature-selection-method-for-human-activity-recognition-