google/gemma-3-27b-it · Could not find the transformer layer class SiglipMultiheadAttentionPoolingHead in the model.

I am trying to load gemma3 for finetuning using fsdp on multi GPUs

but encountered the following error:

"ValueError: Could not find the transformer layer class SiglipMultiheadAttentionPoolingHead in the model."

Here's the model I printed out after loading from Gemma3ForConditionalGeneration.from_pretrained()

Gemma3ForConditionalGeneration(
  (vision_tower): SiglipVisionModel(
    (vision_model): SiglipVisionTransformer(
      (embeddings): SiglipVisionEmbeddings(
        (patch_embedding): Conv2d(3, 1152, kernel_size=(14, 14), stride=(14, 14), padding=valid)
        (position_embedding): Embedding(4096, 1152)
      )
      (encoder): SiglipEncoder(
        (layers): ModuleList(
          (0-26): 27 x SiglipEncoderLayer(
            (layer_norm1): LayerNorm((1152,), eps=1e-06, elementwise_affine=True)
            (self_attn): SiglipAttention(
              (k_proj): Linear(in_features=1152, out_features=1152, bias=True)
              (v_proj): Linear(in_features=1152, out_features=1152, bias=True)
              (q_proj): Linear(in_features=1152, out_features=1152, bias=True)
              (out_proj): Linear(in_features=1152, out_features=1152, bias=True)
            )
            (layer_norm2): LayerNorm((1152,), eps=1e-06, elementwise_affine=True)
            (mlp): SiglipMLP(
              (activation_fn): PytorchGELUTanh()
              (fc1): Linear(in_features=1152, out_features=4304, bias=True)
              (fc2): Linear(in_features=4304, out_features=1152, bias=True)
            )
          )
        )
      )
      (post_layernorm): LayerNorm((1152,), eps=1e-06, elementwise_affine=True)
    )
  )
  (multi_modal_projector): Gemma3MultiModalProjector(
    (mm_soft_emb_norm): Gemma3RMSNorm((1152,), eps=1e-06)
    (avg_pool): AvgPool2d(kernel_size=4, stride=4, padding=0)
  )
  (language_model): Gemma3ForCausalLM(
    (model): Gemma3TextModel(
      (embed_tokens): Gemma3TextScaledWordEmbedding(262208, 2560, padding_idx=0)
      (layers): ModuleList(
        (0-33): 34 x Gemma3DecoderLayer(
          (self_attn): Gemma3Attention(
            (q_proj): Linear(in_features=2560, out_features=2048, bias=False)
            (k_proj): Linear(in_features=2560, out_features=1024, bias=False)
            (v_proj): Linear(in_features=2560, out_features=1024, bias=False)
            (o_proj): Linear(in_features=2048, out_features=2560, bias=False)
            (q_norm): Gemma3RMSNorm((256,), eps=1e-06)
            (k_norm): Gemma3RMSNorm((256,), eps=1e-06)
          )
          (mlp): Gemma3MLP(
            (gate_proj): Linear(in_features=2560, out_features=10240, bias=False)
            (up_proj): Linear(in_features=2560, out_features=10240, bias=False)
            (down_proj): Linear(in_features=10240, out_features=2560, bias=False)
            (act_fn): PytorchGELUTanh()
          )
          (input_layernorm): Gemma3RMSNorm((2560,), eps=1e-06)
          (post_attention_layernorm): Gemma3RMSNorm((2560,), eps=1e-06)
          (pre_feedforward_layernorm): Gemma3RMSNorm((2560,), eps=1e-06)
          (post_feedforward_layernorm): Gemma3RMSNorm((2560,), eps=1e-06)
        )
      )
      (norm): Gemma3RMSNorm((2560,), eps=1e-06)
      (rotary_emb): Gemma3RotaryEmbedding()
      (rotary_emb_local): Gemma3RotaryEmbedding()
    )
    (lm_head): Linear(in_features=2560, out_features=262208, bias=False)
  )
)

indeed I don't see the layer. However, in the modeling_gemma3.py file, _no_split_modules has SiglipMultiheadAttentionPoolingHead.

I looked into google/siglip-so400m-patch14-384 and it has the layer mentioned.

Did anyone else have the same issue? How can I fix or work around it?