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

📢 A SMALLER AFFORDABLE MoE MODEL FOR EVERYONE!!

🤗 Model Weights | 🚀 Quick Start | ⚙️ Installation Guide | 🚧 Expert Construction | 🚅 Continual Pre-training | 💎 Evaluation | 💬 Supervised Fine-Tuning (SFT)

📃 Technical Report

🎉 Introduction

LLaMA-MoE is a series of open-sourced Mixture-of-Expert (MoE) models based on LLaMA and SlimPajama. We build LLaMA-MoE with the following two steps:

1. Partition LLaMA's FFNs into sparse experts and insert top-K gate for each layer of experts.
2. Continually pre-train the initialized MoE model with an optimized data sampling weights from Sheared LLaMA and filtered datasets from SlimPajama.

🔥 Features

1. Lightweight Models: The number of activated model parameters is only 3.0~3.5B, which is friendly for deployment and research usage.
2. Multiple Expert Construction Methods:
   1. Neuron-Independent: Random, Clustering, Co-activation Graph, Gradient (Zhang et al., 2022, Zuo et al., 2022)
   2. Neuron-Sharing: Inner, Inter (residual)
3. Multiple MoE Gating Strategies:
   1. TopK Noisy Gate (Shazeer et al., 2017)
   2. Switch Gating (Fedus et al., 2022)
4. Fast Continual Pre-training:
   1. FlashAttention-v2 integrated (Dao, 2023)
   2. Fast streaming dataset loading
5. Abundant Monitor Items:
   1. Gate load, gate importance
   2. Loss on steps, loss on tokens, balance loss
   3. TGS (tokens/GPU/second), MFU (model FLOPs utilization)
   4. Other visualization utilities
6. Dynamic Weight Sampling:
   1. Self-defined static sampling weights
   2. Sheared LLaMA's dynamic batch loading (Xia et al., 2023)

🚀 QuickStart

# python>=3.10

import torch
from transformers import AutoTokenizer, AutoModelForCausalLM

model_dir = "llama-moe/LLaMA-MoE-v1-3_5B-2_8"
tokenizer = AutoTokenizer.from_pretrained(model_dir, trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(model_dir, torch_dtype=torch.bfloat16, trust_remote_code=True)
model.eval()
model.to("cuda:0")

input_text = "Suzhou is famous of"
inputs = tokenizer(input_text, return_tensors="pt")
inputs = inputs.to("cuda:0")

pred = model.generate(**inputs, max_length=50, temperature=0.0)
print(tokenizer.decode(pred.cpu()[0], skip_special_tokens=True))
# Suzhou is famous of its beautiful gardens. The most famous one is the Humble Administrator's Garden. It is a classical Chinese garden with a history of more than 600 years. The garden is divided into three

⚙️ Installation

1. Prepare conda environment: conda create -n smoe python=3.11 (If your environment name is not smoe, you may need to change environment in launching scripts)
2. Add correct environment variables in ~/.bashrc (gcc is set to newer version for installing flash-attn). e.g.:

   export PATH=/mnt/petrelfs/share/cuda-11.8/bin:$PATH
   export LD_LIBRARY_PATH=/mnt/petrelfs/share/cuda-11.8/lib64:$LD_LIBRARY_PATH
   export PATH=/mnt/petrelfs/share/gcc-10.1.0/bin:$PATH
   export LD_LIBRARY_PATH=/mnt/petrelfs/share/gcc-10.1.0/lib64:$LD_LIBRARY_PATH

3. Take the variables into effect: source ~/.bashrc
4. Install PyTorch (CUDA-11.8): pip3 install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu118
5. Install dependencies: pip install -r requirements.txt
6. Install flash-attn: pip install flash-attn==2.0.1 --no-build-isolation. You may need to follow the flash-attn installation instructions to avoid some errors.
7. Install the latest Git: conda install git
8. Clone the repo: git clone git@github.com:pjlab-sys4nlp/llama-moe.git (If you don't setup the ssh key to GitHub, you may not able to clone through ssh. Check the docs about it.)
9. Change current directory: cd llama-moe
10. Install smoe in editable mode: pip install -e .[dev]
11. Setup pre-commit hooks: pre-commit install

📊 Model Performance

Model	#Activated Experts	#Experts	#Activated Params	Foundation Model	SFT Model
LLaMA-MoE-3.0B	2	16	3.0B	🤗 base	🤗 SFT
LLaMA-MoE-3.5B (4/16)	4	16	3.5B	🤗 base	🤗 SFT
LLaMA-MoE-3.5B (2/8)	2	8	3.5B	🤗 base	🤗 SFT

• Foundation models

Model	Average	SciQ	PIQA	WinoGrande	ARC-e	ARC-c (25)	HellaSwag (10)	LogiQA	BoolQ (32)	LAMBADA	NQ (32)	MMLU (5)
OPT-2.7B	50.3	78.9	74.8	60.8	54.4	34.0	61.4	25.8	63.3	63.6	10.7	25.8
Pythia-2.8B	51.5	83.2	73.6	59.6	58.8	36.7	60.7	28.1	65.9	64.6	8.7	26.8
INCITE-BASE-3B	53.7	85.6	73.9	63.5	61.7	40.3	64.7	27.5	65.8	65.4	15.2	27.2
Open-LLaMA-3B-v2	55.6	88.0	77.9	63.1	63.3	40.1	71.4	28.1	69.2	67.4	16.0	26.8
Sheared-LLaMA-2.7B	56.4	87.5	76.9	65.0	63.3	41.6	71.0	28.3	73.6	68.3	17.6	27.3
LLaMA-MoE-3.0B	55.5	84.2	77.5	63.6	60.2	40.9	70.8	30.6	71.9	66.6	17.0	26.8
LLaMA-MoE-3.5B (4/16)	57.7	87.6	77.9	65.5	65.6	44.2	73.3	29.7	75.0	69.5	20.3	26.8
LLaMA-MoE-3.5B (2/8)	57.6	88.4	77.6	66.7	65.3	43.1	73.3	29.6	73.9	69.4	19.8	27.0

• SFT models

Model	MMLU	ARC-c	HellaSeag	TruthfulQA	MT-Bench
Sheared LLaMA-2.7B ShareGPT	28.41	41.04	71.21	47.65	3.79
Sheared LLaMA-2.7B Deita6K (Our Impl.)	25.24	43.69	71.70	49.00	4.06
LLaMA-MoE-v1-3.0B (2/16)	23.61	43.43	72.28	44.24	4.15
LLaMA-MoE-v1-3.5B (4/16)	26.49	48.29	75.10	45.91	4.60
LLaMA-MoE-v1-3.5B (2/8)	25.53	45.99	74.95	44.39	4.72

🚧 Expert Construction

• Neuron-Independent
  • Independent_Random: bash ./scripts/expert_construction/split/run_split_random.sh
  • Independent_Clustering: bash ./scripts/expert_construction/split/run_split_clustering.sh
• Neuron-Sharing
  • Sharing_Inner: bash ./scripts/expert_construction/split/run_split_gradient.sh
  • Sharing_Inter: bash ./scripts/expert_construction/split/run_split_gradient_residual.sh

For more information, please refer to Expert Construction docs.

🚅 Continual Pre-training

Tokenization

Download SlimPajama into /path_to_data and put data from different domains into separate folders:

• /path_to_data/en_arxiv
• /path_to_data/en_book
• /path_to_data/en_c4
• /path_to_data/en_cc
• /path_to_data/en_stack
• /path_to_data/en_wikipedia
• /path_to_data/github

Each file should be end with *.jsonl and each line looks like:

{"id": "id-info", "content": "raw text to be tokenized"}

Run the following command to tokenize the data in each folder:

python -m smoe.utils.tokenize \
  -f jsonl \
  -t /path_to_tokenizer \
  -i /path_to_data/en_arxiv \
  -o /path_to_data_tokenized/en_arxiv

Continual Pre-training (CPT)

• NOTICE: Please create logs/ folder manually: mkdir -p logs
• To run the continual pre-training, please check the CPT docs.

💎 Evaluation

• For evalution on Natural Questions (NQ), please refer to opencompass.
• For other tasks, please refer to lm-eval-harness.

💬 Supervised Fine-Tuning (SFT)

We provide simple examples of SFT to build chatbots. Please refer to SFT docs and /mnt/petrelfs/zhutong/smoe/scripts/sft for more details.

📑 Citation

@misc{llama-moe-2023,
  title={LLaMA-MoE: Building Mixture-of-Experts from LLaMA with Continual Pre-training},
  author={LLaMA-MoE Team},
  year={2023},
  month={Dec},
  url={https://github.com/pjlab-sys4nlp/llama-moe}
}

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LLaMA-MoE Team w/ ❤️