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LLaMA-MoE: Building Mixture-of-Experts from LLaMA with Continual Pre-training

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arxiv 2406.16554 v1 pith:ZSDM76VO submitted 2024-06-24 cs.CL

classification cs.CL
keywords modelscontinuallanguagellama-moemodelparameterspre-trainingbuilding
verification ladder T0 review T1 audit T2 compute T3 formal
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Mixture-of-Experts (MoE) has gained increasing popularity as a promising framework for scaling up large language models (LLMs). However, training MoE from scratch in a large-scale setting still suffers from data-hungry and instability problems. Motivated by this limit, we investigate building MoE models from existing dense large language models. Specifically, based on the well-known LLaMA-2 7B model, we obtain an MoE model by: (1) Expert Construction, which partitions the parameters of original Feed-Forward Networks (FFNs) into multiple experts; (2) Continual Pre-training, which further trains the transformed MoE model and additional gate networks. In this paper, we comprehensively explore different methods for expert construction and various data sampling strategies for continual pre-training. After these stages, our LLaMA-MoE models could maintain language abilities and route the input tokens to specific experts with part of the parameters activated. Empirically, by training 200B tokens, LLaMA-MoE-3.5B models significantly outperform dense models that contain similar activation parameters. The source codes and models are available at https://github.com/pjlab-sys4nlp/llama-moe .

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Forward citations

Cited by 7 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Relax Within, Balance Across: Geometry-Guided Load Balancing for Vision-Language Mixture-of-Experts

    cs.CV 2026-08 accept novelty 6.0 of 10

    The standard mixed image-text load-balancing loss lets modality errors cancel at one token mix; ReBA balances each modality separately and per image, reducing load across resolutions and tiles with comparable accuracy.

  2. Communication-Aware Placement and Pruning for Efficient Mixture-of-Experts Inference

    cs.DC 2026-07 conditional novelty 6.0 of 10

    Communication-aware expert placement plus device-level pruning yields 1.23–1.86× MoE inference throughput and better accuracy at equal speedup than load-balance or sequential baselines.

  3. Cache Management for Mixture-of-Experts LLMs -- extended version

    cs.LG 2025-09 conditional novelty 6.0 of 10

    The paper formalizes expert caching in MoE LLMs as layered paging, proves near-tight competitive lower bounds, and shows a layer-aware LRU variant beats standard LRU on real traces.

  4. What You Have is What You Track: Adaptive and Robust Multimodal Tracking

    cs.CV 2025-07 conditional novelty 6.0 of 10

    FlexTrack claims state-of-the-art multimodal tracking on complete and simulated missing-modality benchmarks, using heterogeneous mixture-of-experts fusion and a video-level masking training strategy.

  5. Advancing Decoding Strategies: Enhancements in Locally Typical Sampling for LLMs

    cs.CL 2025-06 reject novelty 5.0 of 10

    ASTS extends locally typical sampling with semantic scoring and dynamic thresholds, reporting improved perplexity, MAUVE, and diversity on story and summarization tasks.

  6. Speculate, then Collaborate: Fusing Knowledge of Language Models during Decoding

    cs.CL 2025-02 conditional novelty 5.0 of 10

    CoSD fuses two LLMs at decoding time: it keeps the draft model's tokens unless a confidence rule or a decision tree over token probabilities says the assistant model's token is better.

  7. SkipGPT: Dynamic Layer Pruning Reinvented with Token Awareness and Module Decoupling

    cs.CL 2025-06 conditional novelty 4.0 of 10

    SkipGPT learns per-token, per-module routers that dynamically skip attention and MLP blocks, then uses LoRA to recover most of the original model's quality.

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