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PMGT-VR: un marco algorítmico descentralizado de gradiente proximal con reducción de la varianza
IEEE transactions on pattern analysis and machine intelligence
|September 5, 2025
Resumen
Presentamos PMGT-VR, un nuevo algoritmo descentralizado para la optimización compuesta. Se obtienen tasas de convergencia rápidas comparables a los métodos centralizados, ofreciendo la primera convergencia lineal para problemas compuestos estocásticos descentralizados.
Área de la Ciencia:
- Teoría de la optimización
- Sistemas distribuidos
- Aprendizaje automático
Sus antecedentes:
- Los problemas de optimización compuesta descentralizada son cruciales en el aprendizaje automático distribuido y el procesamiento de señales.
- Los algoritmos descentralizados existentes a menudo sufren de convergencia lenta o requieren suposiciones fuertes.
- Cerrar la brecha entre el rendimiento de optimización centralizado y descentralizado es un desafío clave.
Objetivo del estudio:
- Proponer un nuevo marco algorítmico descentralizado de reducción de varianza de gradiente proximal (PMGT-VR) para la optimización compuesta.
- Para lograr tasas de convergencia similares a los algoritmos centralizados en un entorno descentralizado.
- Para introducir el primer algoritmo estocástico descentralizado linealmente convergente para esta clase de problemas.
Principales métodos:
- Desarrollo del marco PMGT-VR que combina el consenso múltiple, el seguimiento de gradientes y la reducción de la varianza.
- Análisis de dos algoritmos específicos: el PMGT-SAGA y el PMGT-LSVRG
- Comparación con algoritmos proximales descentralizados de última generación.
Principales resultados:
- El marco PMGT-VR permite que los algoritmos descentralizados imiten las tasas de convergencia centralizadas.
- PMGT-SAGA y PMGT-LSVRG demuestran un rendimiento competitivo frente a los métodos existentes.
- PMGT-VR es el primer marco para lograr convergencia lineal para la optimización estocástica compuesta descentralizada.
Conclusiones:
- El marco PMGT-VR propuesto avanza significativamente en la optimización descentralizada.
- Los algoritmos desarrollados ofrecen soluciones eficientes para problemas distribuidos a gran escala.
- Los experimentos numéricos validan los hallazgos teóricos y la eficacia práctica.
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