Gemma#

Deprecation notice: Gemma 1 support (2B and 7B) is no longer actively maintained or tested against current upstream checkpoints and will be removed in Megatron Bridge 0.7.0.

Gemma is Google’s original lightweight open model family. Megatron Bridge supports Gemma causal language models through the GemmaBridge implementation for the Hugging Face GemmaForCausalLM architecture.

Supported Variants#

Megatron Bridge supports Hugging Face Gemma checkpoints that use the gemma model type, including:

  • Gemma 2B: https://huggingface.co/google/gemma-2b

  • Gemma 7B: https://huggingface.co/google/gemma-7b

  • Gemma release collection: https://huggingface.co/collections/google/gemma-release-65d5efbccdbb8c4202ec078b

Architecture Notes#

  • RMSNorm with zero-centered gamma.

  • GeGLU-style gated MLPs.

  • RoPE positional embeddings and flash attention backend.

  • Shared input/output embedding weights.

Examples#

Gemma uses the common conversion and generation entry points:

./scripts/conversion/convert.sh import \
  --hf-model google/gemma-2b \
  --megatron-path /checkpoints/gemma_2b_megatron

uv run python examples/conversion/hf_to_megatron_generate_text.py \
  --hf_model_path google/gemma-2b \
  --megatron_model_path /checkpoints/gemma_2b_megatron \
  --prompt "What is artificial intelligence?"