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INTELLECT-3-V

A vision-language model created by grafting the language model weights from INTELLECT-3 into the GLM-4.6V architecture.

Motivation

INTELLECT-3 is a strong open-source language model, but lacks vision capabilities. GLM-4.6V is a vision-language model with an identical language model architecture. By replacing GLM-4.6V's language model weights with INTELLECT-3's weights while preserving the vision encoder and projection layers, we create a vision-language model powered by INTELLECT-3.

Architecture

Both models share the same language model backbone:

46 transformer layers (layer 0 is dense MLP, layers 1-45 are MoE)
4096 hidden dimension
128 routed experts + shared experts per MoE layer
Grouped Query Attention (12288 q_proj, 1024 k/v_proj)
151552 vocabulary size
BF16 weights

GLM-4.6V additionally includes:

24-layer vision transformer (1536 hidden dim)
Visual merger projecting vision features to LLM hidden dimension
Downsampling convolution for spatial compression

What Was Grafted

The following weights were copied from INTELLECT-3 to GLM-4.6V:

INTELLECT-3	GLM-4.6V
`model.layers.*`	`model.language_model.layers.*`
`model.norm.weight`	`model.language_model.norm.weight`

What Was Preserved (from GLM-4.6V)

model.language_model.embed_tokens.weight — kept to maintain vision token compatibility
lm_head.weight — kept aligned with embed_tokens
model.visual.* — entire vision encoder and merger preserved

Rationale

Why replace the final norm? The RMSNorm after the last transformer layer is tightly coupled to the layer outputs it normalizes. INTELLECT-3's norm was trained end-to-end with its layers and learned to normalize their specific output distribution.

Why keep embed_tokens? The vision merger projects visual features into the same embedding space as text tokens. Replacing embed_tokens could break the alignment between text and vision embeddings. Additionally, lm_head is often tied or co-trained with embed_tokens.

Why not replace lm_head? Same reasoning — keeping lm_head and embed_tokens together maintains their learned relationship.

Known Limitations

Embedding space mismatch: INTELLECT-3's layers learned representations in a potentially different embedding space than GLM-4.6V. This may cause some degradation in both language and vision-language performance.
Vision-language alignment: The visual merger was trained to project into GLM-4.6V's representation space. INTELLECT-3 may have learned different internal representations, potentially affecting vision-language tasks.
Tokenizer compatibility: While both models have the same vocabulary size (151552), verify tokenizer compatibility for your use case.

Creation Script

The model was created using graft_intellect3_to_glm.py:

python graft_intellect3_to_glm.py \
    --intellect3 ~/models/INTELLECT-3 \
    --glm ~/models/GLM-4.6V \
    --output ~/models/INTELLECT-3-V

Source Model Architectures

INTELLECT-3

lm_head.weight,[151552,4096],BF16
model.embed_tokens.weight,[151552,4096],BF16
model.layers.0.mlp.down_proj.weight,[4096,10944],BF16
model.layers.0.mlp.gate_proj.weight,[10944,4096],BF16
model.layers.0.mlp.up_proj.weight,[10944,4096],BF16
model.layers.[0-45].input_layernorm.weight,[4096],BF16
model.layers.[0-45].post_attention_layernorm.weight,[4096],BF16
model.layers.[0-45].self_attn.k_proj.bias,[1024],BF16
model.layers.[0-45].self_attn.k_proj.weight,[1024,4096],BF16
model.layers.[0-45].self_attn.o_proj.weight,[4096,12288],BF16
model.layers.[0-45].self_attn.q_proj.bias,[12288],BF16
model.layers.[0-45].self_attn.q_proj.weight,[12288,4096],BF16
model.layers.[0-45].self_attn.v_proj.bias,[1024],BF16
model.layers.[0-45].self_attn.v_proj.weight,[1024,4096],BF16
model.layers.[1-45].mlp.experts.[0-127].down_proj.weight,[4096,1408],BF16
model.layers.[1-45].mlp.experts.[0-127].gate_proj.weight,[1408,4096],BF16
model.layers.[1-45].mlp.experts.[0-127].up_proj.weight,[1408,4096],BF16
model.layers.[1-45].mlp.gate.e_score_correction_bias,[128],F32
model.layers.[1-45].mlp.gate.weight,[128,4096],BF16
model.layers.[1-45].mlp.shared_experts.down_proj.weight,[4096,1408],BF16
model.layers.[1-45].mlp.shared_experts.gate_proj.weight,[1408,4096],BF16
model.layers.[1-45].mlp.shared_experts.up_proj.weight,[1408,4096],BF16
model.norm.weight,[4096],BF16

GLM-4.6V

lm_head.weight,[151552,4096],BF16
model.language_model.embed_tokens.weight,[151552,4096],BF16
model.language_model.layers.0.mlp.down_proj.weight,[4096,10944],BF16
model.language_model.layers.0.mlp.gate_proj.weight,[10944,4096],BF16
model.language_model.layers.0.mlp.up_proj.weight,[10944,4096],BF16
model.language_model.layers.[0-45].input_layernorm.weight,[4096],BF16
model.language_model.layers.[0-45].post_attention_layernorm.weight,[4096],BF16
model.language_model.layers.[0-45].self_attn.k_proj.bias,[1024],BF16
model.language_model.layers.[0-45].self_attn.k_proj.weight,[1024,4096],BF16
model.language_model.layers.[0-45].self_attn.o_proj.weight,[4096,12288],BF16
model.language_model.layers.[0-45].self_attn.q_proj.bias,[12288],BF16
model.language_model.layers.[0-45].self_attn.q_proj.weight,[12288,4096],BF16
model.language_model.layers.[0-45].self_attn.v_proj.bias,[1024],BF16
model.language_model.layers.[0-45].self_attn.v_proj.weight,[1024,4096],BF16
model.language_model.layers.[1-45].mlp.experts.[0-127].down_proj.weight,[4096,1408],BF16
model.language_model.layers.[1-45].mlp.experts.[0-127].gate_proj.weight,[1408,4096],BF16
model.language_model.layers.[1-45].mlp.experts.[0-127].up_proj.weight,[1408,4096],BF16
model.language_model.layers.[1-45].mlp.gate.e_score_correction_bias,[128],F32
model.language_model.layers.[1-45].mlp.gate.weight,[128,4096],BF16
model.language_model.layers.[1-45].mlp.shared_experts.down_proj.weight,[4096,1408],BF16
model.language_model.layers.[1-45].mlp.shared_experts.gate_proj.weight,[1408,4096],BF16
model.language_model.layers.[1-45].mlp.shared_experts.up_proj.weight,[1408,4096],BF16
model.language_model.norm.weight,[4096],BF16
model.visual.blocks.[0-23].attn.proj.weight,[1536,1536],BF16
model.visual.blocks.[0-23].attn.qkv.weight,[4608,1536],BF16
model.visual.blocks.[0-23].mlp.down_proj.weight,[1536,4096],BF16
model.visual.blocks.[0-23].mlp.gate_proj.weight,[4096,1536],BF16
model.visual.blocks.[0-23].mlp.up_proj.weight,[4096,1536],BF16
model.visual.blocks.[0-23].norm[1-2].weight,[1536],BF16
model.visual.downsample.bias,[4096],BF16
model.visual.downsample.weight,[4096,1536,2,2],BF16
model.visual.embeddings.position_embedding.weight,[576,1536],BF16
model.visual.merger.down_proj.weight,[4096,10944],BF16
model.visual.merger.gate_proj.weight,[10944,4096],BF16
model.visual.merger.post_projection_norm.bias,[4096],BF16
model.visual.merger.post_projection_norm.weight,[4096],BF16
model.visual.merger.proj.weight,[4096,4096],BF16
model.visual.merger.up_proj.weight,[10944,4096],BF16
model.visual.patch_embed.proj.bias,[1536],BF16
model.visual.patch_embed.proj.weight,[1536,3,2,14,14],BF16
model.visual.post_conv_layernorm.weight,[1536],BF16
model.visual.post_layernorm.weight,[1536],BF16

License

Please refer to the licenses of the source models:

Acknowledgments

Prime Intellect for INTELLECT-3
THUDM for GLM-4.6V

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Model size

108B params

Tensor type

BF16

F32

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