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Override SSM_A op for Qwen3 Next to reduce splits #17587

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Override SSM_A op for Qwen3 Next to reduce splits #17587

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0a60230
Override SSM_A op for Qwen3 Next to reduce splits
pwilkin Nov 29, 2025
bac8ded
New tensor mapping SSM_A_NOSCAN for SSM_A used outside of OP_SSM_SCAN…
pwilkin Dec 1, 2025
e79bae0
Update src/llama-model.cpp
pwilkin Dec 1, 2025
5f93ef6
Update src/llama-model.cpp
pwilkin Dec 1, 2025
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3 changes: 2 additions & 1 deletion src/llama-arch.cpp
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Expand Up @@ -853,7 +853,7 @@ static const std::map<llm_arch, std::map<llm_tensor, const char *>> LLM_TENSOR_N
{ LLM_TENSOR_FFN_GATE_SHEXP, "blk.%d.ffn_gate_shexp" },
{ LLM_TENSOR_FFN_DOWN_SHEXP, "blk.%d.ffn_down_shexp" },
{ LLM_TENSOR_FFN_UP_SHEXP, "blk.%d.ffn_up_shexp" },
{ LLM_TENSOR_SSM_A, "blk.%d.ssm_a" },
{ LLM_TENSOR_SSM_A_NOSCAN, "blk.%d.ssm_a" },
{ LLM_TENSOR_SSM_CONV1D, "blk.%d.ssm_conv1d" },
{ LLM_TENSOR_SSM_DT, "blk.%d.ssm_dt" },
{ LLM_TENSOR_SSM_BETA_ALPHA, "blk.%d.ssm_ba" },
Expand Down Expand Up @@ -2611,6 +2611,7 @@ static const std::map<llm_tensor, llm_tensor_info> LLM_TENSOR_INFOS = {
{LLM_TENSOR_FFN_ACT, {LLM_TENSOR_LAYER_REPEATING, GGML_OP_DIV}},
{LLM_TENSOR_SSM_CONV1D, {LLM_TENSOR_LAYER_REPEATING, GGML_OP_SSM_CONV}},
{LLM_TENSOR_SSM_A, {LLM_TENSOR_LAYER_REPEATING, GGML_OP_SSM_SCAN}},
{LLM_TENSOR_SSM_A_NOSCAN, {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL}}, // a version of SSM_A used for MUL instead of SSM_SCAN
{LLM_TENSOR_SSM_DT_NORM, {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL}},
{LLM_TENSOR_SSM_B_NORM, {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL}},
{LLM_TENSOR_SSM_C_NORM, {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL}},
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1 change: 1 addition & 0 deletions src/llama-arch.h
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Expand Up @@ -377,6 +377,7 @@ enum llm_tensor {
LLM_TENSOR_SSM_DT,
LLM_TENSOR_SSM_DT_NORM,
LLM_TENSOR_SSM_A,
LLM_TENSOR_SSM_A_NOSCAN, // qwen3next special case with MUL instead of SSM_SCAN
LLM_TENSOR_SSM_B_NORM,
LLM_TENSOR_SSM_C_NORM,
LLM_TENSOR_SSM_D,
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2 changes: 1 addition & 1 deletion src/llama-model.cpp
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Expand Up @@ -6487,7 +6487,7 @@ bool llama_model::load_tensors(llama_model_loader & ml) {
layer.ssm_in = create_tensor(tn(LLM_TENSOR_SSM_IN, "weight", i), { n_embd, qkvz_dim }, 0);
layer.ssm_conv1d = create_tensor(tn(LLM_TENSOR_SSM_CONV1D, "weight", i), { hparams.ssm_d_conv, conv_dim }, 0);
layer.ssm_dt = create_tensor(tn(LLM_TENSOR_SSM_DT, "bias", i), { hparams.ssm_dt_rank }, 0);
layer.ssm_a = create_tensor(tn(LLM_TENSOR_SSM_A, i), { hparams.ssm_dt_rank }, 0);
layer.ssm_a = create_tensor(tn(LLM_TENSOR_SSM_A_NOSCAN, i), { hparams.ssm_dt_rank }, 0);
layer.ssm_beta_alpha = create_tensor(tn(LLM_TENSOR_SSM_BETA_ALPHA, "weight", i), { n_embd, ba_dim }, 0);
layer.ssm_norm = create_tensor(tn(LLM_TENSOR_SSM_NORM, "weight", i), { head_v_dim }, 0);
layer.ssm_out = create_tensor(tn(LLM_TENSOR_SSM_OUT, "weight", i), { value_dim, n_embd }, 0);
Expand Down
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