DualPipe, Bidirectional Parallelism, and the Zero-Bubble Frontier
Overlapping forward and backward execution phases across mirrored pipeline stages virtually eliminates inter-node communication bubbles in massive distributed mixture-of-experts training.
- [ANALYSIS] Bidirectional pipeline schedules interleave forward micro-batches with backward passes from opposing ends of the model, hiding cross-node communication behind math.
- [ANALYSIS] Fine-grained overlap reduces idle pipeline bubble ratios to negligible fractions, achieving unprecedented compute utilization on commodity network fabrics.
