[feat] Add Support Cut-Cross-Entropy (CCE)

[w1ida]

This PR adds optional Cut-Cross-Entropy (CCE) loss into the ms-swift training pipeline.
CCE is a memory-efficient alternative to standard CE, from Apple’s project:

➡️ https://github.com/apple/ml-cross-entropy

---

✨ Features

• Add use_cce=True in TrainArguments to enable CCE.
• Plug-and-play replacement; no model modification required.
• Add test script: tests/train/test_cce.py.

Usage:

TrainArguments(
    model='Qwen/Qwen2.5-0.5B-Instruct',
    dataset=['gsm8k#1024'],
    split_dataset_ratio=0.01,
    use_cce=True,
    **kwargs
)

Install dependency:

pip install "cut-cross-entropy @ git+https://github.com/w1ida/ml-cross-entropy.git"

---

📊 Memory Result (A10, BS=64)

• Hardware: NVIDIA A10
• transformers: 4.56.1
• Model: Qwen/Qwen2.5-0.5B-Instruct
• Dataset: gsm8k#1024
• Batch size: 64

Environment

• Hardware: NVIDIA A10
• transformers: 4.56.1
• Model: Qwen/Qwen2.5-0.5B-Instruct
• Dataset: gsm8k#1024
• Batch size: 64

Memory Usage

Loss	Memory (GiB)
transformers CE	16.24
CCE	2.62

≈ 84% memory reduction.

---

📄 Reference

Cut Your Losses in Large-Vocabulary Language Models
https://arxiv.org/abs/2411.09009

[gemini-code-assist]

Summary of Changes

Hello @w1ida, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request integrates Cut-Cross-Entropy (CCE) loss into the training pipeline, offering a significant memory optimization for large language models. By providing a memory-efficient alternative to traditional cross-entropy, it enables training of larger models or larger batch sizes on existing hardware, making the training process more accessible and scalable.

Highlights

• Cut-Cross-Entropy (CCE) Integration: Introduced optional CCE loss into the training pipeline, a memory-efficient alternative to standard cross-entropy, based on Apple's ml-cross-entropy project.
• Memory Efficiency: Demonstrated approximately 84% memory reduction on an NVIDIA A10 GPU for a Qwen model with a batch size of 64, significantly optimizing resource usage.
• Ease of Use: CCE can be enabled by setting "use_cce=True" in "TrainArguments" and is designed as a plug-and-play replacement without requiring model modifications.
• Model Support: The CCE patching mechanism supports various LLM architectures including Llama, Mistral, Phi3, Gemma2, and Qwen2.
• Test Coverage: A new test script ("tests/train/test_cce.py") has been added to validate CCE functionality during SFT training, ensuring proper integration and operation.

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[gemini-code-assist]

Code Review

This pull request introduces support for Cut-Cross-Entropy (CCE) loss, offering a memory-efficient alternative for training. The changes integrate CCE into the training pipeline, add UI elements for activation, and include a dedicated test script. The implementation generally follows existing patterns for kernel integrations, such as the Liger kernel, ensuring consistency. The UI updates are well-localized and clearly explain the new feature. Overall, this is a valuable addition for optimizing memory usage during training.