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0️⃣1️⃣🤗 BitNet-Transformers: Huggingface Transformers Implementation of "BitNet: Scaling 1-bit Transformers for Large Language Models" in pytorch with Llama(2) Architecture

BitNet Architecture

BitNet

Prepare Dev env

# Clone this repo
git clone https://github.com/beomi/bitnet-transformers
cd bitnet-transformers

# Install requirements
pip install -r clm_requirements.txt

# Clone transformers repo
git clone https://github.com/huggingface/transformers
pip install -e transformers

# Update Llama(2) model
rm ./transformers/src/transformers/models/llama/modeling_llama.py
ln -s $(pwd)/bitnet_llama/modeling_llama.py ./transformers/src/transformers/models/llama/modeling_llama.py

We'll overwrite bitnet_llama/modeling_llama.py into transformers. Since the file is linked, any changes made to the file will be reflected in the transformers repo.

Train Wikitext-103

Train Loss Graph when train BitLLAMA using Wikitext-103

You can track metrics via wandb

./train_wikitext.sh

GPU Mem Usage Comparison

Train Config

  • Batch size: 1
  • Gradient accumulation: 1
  • Seq length: 2048
  • Model: LLamaForCausalLM with BitLinear layer
  • Model size: 47,452,672 (47.5M)

Original LLAMA - 16bit

  • Uses 250MB GPU memory for Model weights

BitLLAMA - Mixed 16bit

  • Uses 200MB GPU memory for Model weights
  • Use bf16(or fp16) to store model weights
  • Use int8 to store -1/1 1-bit weights
  • Use more memory when training than original LLAMA: It saves 1-bit weight and 16bit weight together

BitLLAMA - 8bit

  • Uses 100MB GPU memory for Model weights
  • Use bf16(or fp16) on-the-fly when needed
  • Use 8bit to save 1-bit BitLinear weight & other weights

BitLLAMA - 1bit

  • Use bf16(or fp16) on-the-fly when needed
  • Use 1bit to save 1-bit weight
TBD

Todo

  • Add BitLinear layer
  • Add LLamaForCausalLM model with BitLinear layer
    • Update .save_pretrained method (for 1-bit weight saving)
  • Add sample code for LM training
  • Update BitLinear layer to use 1-bit weight
    • Use uint8 instead of bfloat16
    • Use custom cuda kernel for 1-bit weight