bridge.models.qwen.qwen3_bridge

Module Contents

Classes

Qwen3Bridge

Megatron Bridge for Qwen3 Causal LM.

API

class bridge.models.qwen.qwen3_bridge.Qwen3Bridge

Bases: megatron.bridge.models.conversion.model_bridge.MegatronModelBridge

Megatron Bridge for Qwen3 Causal LM.

This bridge handles the conversion between HuggingFace Qwen3ForCausalLM and Megatron-Core GPTModel formats. Qwen3 differs from Qwen2 by using QK layernorm and no QKV bias.

.. rubric:: Example

from megatron.bridge import AutoBridge bridge = AutoBridge.from_hf_pretrained(“Qwen/Qwen3-1.7B”) provider = bridge.to_megatron_provider()

provider_bridge(hf_pretrained)

Convert HuggingFace Qwen3 config to GPTModelProvider.

mapping_registry() → megatron.bridge.models.conversion.mapping_registry.MegatronMappingRegistry

Return the MegatronMappingRegistry for Qwen3 parameter conversion.

Covers all Megatron-Core parameter names for both the standard decoder layers and the MTP (Multi-Token Prediction) transformer layers that are present when mtp_num_layers >= 1.

Simple 1:1 renames are expressed as :class:AutoMapping entries. The fused QKV matrix is handled by :class:QKVMapping and the gated MLP gate+up projection by :class:GatedMLPMapping.