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What makes Mixture-of-Experts models hard to train, and how do you handle routing, load balance, and all-to-all?

MoE buys you more parameters for the same FLOPs, but the gating network, the load imbalance, and the all-to-all shuffle introduce failure modes dense models never see. Here is the training playbook.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

MoE buys you more parameters for the same FLOPs, but the gating network, the load imbalance, and the all-to-all shuffle introduce failure modes dense models never see. Here is the training playbook.

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