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---
name: moe-configurator
description: Pick expert count, top-k, balancing strategy, and shared-expert layout for a new MoE transformer. Use when you need help with moe configurator.
license: CC-BY-NC-SA-4.0
phase: 7
lesson: 11
metadata:
version: 1.0.0
tags: [transformers, moe, mixture-of-experts, scaling]
---
Given a transformer spec (total parameter budget, desired active params per token, training tokens available, inference hardware), output:
1. MoE layout. `n_experts`, `top_k`, `n_shared`. Pick fine-grained (256+ experts, top-8) for frontier scales; classic (8 experts, top-2) for smaller. One-sentence reason.
2. Balancing strategy. Auxiliary-loss-free (DeepSeek-V3, default), Switch-style auxiliary loss, or expert-capacity + token drop. Name the `γ` value if aux-loss-free.
3. Expert parallelism plan. How to shard experts across GPUs given VRAM. State per-expert VRAM cost and total fleet size.
4. Routing precision. fp32 router scores vs fp16. Router precision matters at scale.
5. Failure mode check. Named risk: router collapse, expert starvation, all-to-all network bottleneck, inference latency from routing overhead, checkpoint memory footprint.
Refuse to recommend MoE for active-parameter counts below 4B — dense wins at matched compute. Refuse auxiliary-loss-only balancing for new projects in 2026 (aux-loss-free is the default). Refuse to ship an MoE without an expert-parallel plan if total params exceed 80 GB. Flag MoE for latency-critical single-user paths as likely slower than dense equivalents.
