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| author | Mitja Felicijan <mitja.felicijan@gmail.com> | 2026-02-12 20:57:17 +0100 |
|---|---|---|
| committer | Mitja Felicijan <mitja.felicijan@gmail.com> | 2026-02-12 20:57:17 +0100 |
| commit | b333b06772c89d96aacb5490d6a219fba7c09cc6 (patch) | |
| tree | 211df60083a5946baa2ed61d33d8121b7e251b06 /llama.cpp/src/models/graph-context-mamba.cpp | |
| download | llmnpc-b333b06772c89d96aacb5490d6a219fba7c09cc6.tar.gz | |
Engage!
Diffstat (limited to 'llama.cpp/src/models/graph-context-mamba.cpp')
| -rw-r--r-- | llama.cpp/src/models/graph-context-mamba.cpp | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/llama.cpp/src/models/graph-context-mamba.cpp b/llama.cpp/src/models/graph-context-mamba.cpp new file mode 100644 index 0000000..b9a363b --- /dev/null +++ b/llama.cpp/src/models/graph-context-mamba.cpp @@ -0,0 +1,283 @@ +#include "models.h" + +llm_graph_context_mamba::llm_graph_context_mamba(const llm_graph_params & params) : llm_graph_context(params) {} + +ggml_tensor * llm_graph_context_mamba::build_mamba_layer(llm_graph_input_rs * inp, + ggml_tensor * cur, + const llama_model & model, + const llama_ubatch & ubatch, + int il) { + const auto * mctx_cur = inp->mctx; + + const auto kv_head = mctx_cur->get_head(); + + const auto & layer = model.layers[il]; + + const int64_t d_conv = hparams.ssm_d_conv; + const int64_t d_inner = hparams.ssm_d_inner; + const int64_t d_state = hparams.ssm_d_state; + const int64_t dt_rank = hparams.ssm_dt_rank; + const int64_t n_head = d_inner; + const int64_t head_dim = 1; + const int64_t n_seqs = ubatch.n_seqs; + // Some variants of Mamba arch (e.g. FalconMamba do apply layer norm on B and Dt layers) + const bool ssm_dt_b_c_rms = hparams.ssm_dt_b_c_rms; + + const int64_t n_seq_tokens = ubatch.n_seq_tokens; + + GGML_ASSERT(n_seqs != 0); + GGML_ASSERT(ubatch.equal_seqs()); + GGML_ASSERT(ubatch.n_tokens == n_seq_tokens * n_seqs); + + ggml_tensor * conv_states_all = mctx_cur->get_r_l(il); + ggml_tensor * ssm_states_all = mctx_cur->get_s_l(il); + + ggml_tensor * conv = build_rs(inp, conv_states_all, hparams.n_embd_r(), n_seqs); + conv = ggml_reshape_3d(ctx0, conv, d_conv - 1, d_inner, n_seqs); + + // {n_embd, n_tokens} => {n_embd, n_seq_tokens, n_seqs} + cur = ggml_reshape_3d(ctx0, cur, cur->ne[0], n_seq_tokens, n_seqs); + + // {n_embd, 2*d_inner} @ {n_embd, n_seq_tokens, n_seqs} => {2*d_inner, n_seq_tokens, n_seqs} + ggml_tensor * xz = build_lora_mm(layer.ssm_in, cur); + // split the above in two + // => {d_inner, n_seq_tokens, n_seqs} + ggml_tensor * x = ggml_view_3d(ctx0, xz, d_inner, xz->ne[1], xz->ne[2], xz->nb[1], xz->nb[2], 0); + ggml_tensor * z = + ggml_view_3d(ctx0, xz, d_inner, xz->ne[1], xz->ne[2], xz->nb[1], xz->nb[2], d_inner * ggml_element_size(xz)); + + // conv + { + // => {d_conv - 1 + n_seq_tokens, d_inner, n_seqs} + ggml_tensor * conv_x = ggml_concat(ctx0, conv, ggml_transpose(ctx0, x), 0); + + // copy last (d_conv - 1) columns back into the state cache + ggml_tensor * last_conv = ggml_view_3d(ctx0, conv_x, d_conv - 1, d_inner, n_seqs, conv_x->nb[1], conv_x->nb[2], + n_seq_tokens * (conv_x->nb[0])); + + ggml_build_forward_expand( + gf, ggml_cpy(ctx0, last_conv, + ggml_view_1d(ctx0, conv_states_all, (d_conv - 1) * (d_inner) * (n_seqs), + kv_head * (d_conv - 1) * (d_inner) *ggml_element_size(conv_states_all)))); + + // 1D convolution + // The equivalent is to make a self-overlapping view of conv_x + // over d_conv columns at each stride in the 3rd dimension, + // then element-wise multiply that with the conv1d weight, + // then sum the elements of each row, + // (the last two steps are a dot product over rows (also doable with mul_mat)) + // then permute away the ne[0] dimension, + // and then you're left with the resulting x tensor. + // For simultaneous sequences, all sequences need to have the same length. + x = ggml_ssm_conv(ctx0, conv_x, layer.ssm_conv1d); + + // bias + x = ggml_add(ctx0, x, layer.ssm_conv1d_b); + + x = ggml_silu(ctx0, x); + } + + // ssm + { + // {d_inner, dt_rank + 2*d_state} @ {d_inner, n_seq_tokens, n_seqs} => {dt_rank + 2*d_state, n_seq_tokens, n_seqs} + ggml_tensor * x_db = build_lora_mm(layer.ssm_x, x); + // split + ggml_tensor * dt = ggml_view_3d(ctx0, x_db, dt_rank, n_seq_tokens, n_seqs, x_db->nb[1], x_db->nb[2], 0); + ggml_tensor * B = + ggml_view_4d(ctx0, x_db, d_state, /* n_group */ 1, n_seq_tokens, n_seqs, d_state * x_db->nb[0], x_db->nb[1], + x_db->nb[2], ggml_element_size(x_db) * dt_rank); + ggml_tensor * C = + ggml_view_4d(ctx0, x_db, d_state, /* n_group */ 1, n_seq_tokens, n_seqs, d_state * x_db->nb[0], x_db->nb[1], + x_db->nb[2], ggml_element_size(x_db) * (dt_rank + d_state)); + + // Some Mamba variants (e.g. FalconMamba, Jamba) apply RMS norm in B, C & Dt layers + if (ssm_dt_b_c_rms || (layer.ssm_dt_norm && layer.ssm_b_norm && layer.ssm_c_norm)) { + dt = build_norm(dt, layer.ssm_dt_norm, NULL, LLM_NORM_RMS, il); + B = build_norm(B, layer.ssm_b_norm, NULL, LLM_NORM_RMS, il); + C = build_norm(C, layer.ssm_c_norm, NULL, LLM_NORM_RMS, il); + } + + // {dt_rank, d_inner} @ {dt_rank, n_seq_tokens, n_seqs} => {d_inner, n_seq_tokens, n_seqs} + dt = build_lora_mm(layer.ssm_dt, dt); + dt = ggml_add(ctx0, dt, layer.ssm_dt_b); + + cur = x; + x = ggml_reshape_4d(ctx0, x, head_dim, n_head, n_seq_tokens, n_seqs); + + ggml_tensor * A = layer.ssm_a; + + // use the states and the indices provided by build_recurrent_state + // (this is necessary in order to properly use the states before they are overwritten, + // while avoiding to make unnecessary copies of the states) + auto get_ssm_rows = [&](ggml_context * ctx, ggml_tensor * states, ggml_tensor * ids) { + ggml_tensor * ssm = ggml_reshape_4d(ctx, states, d_state, head_dim, n_head, mctx_cur->get_size()); + + // Custom operator to optimize the parallel associative scan + // as described in the Annex D of the Mamba paper. + // => {d_inner, n_seq_tokens, n_seqs} and {d_state, d_inner, n_seqs} + return ggml_ssm_scan(ctx, ssm, x, dt, A, B, C, ids); + }; + + ggml_tensor * y_ssm = build_rs(inp, ssm_states_all, hparams.n_embd_s(), ubatch.n_seqs, get_ssm_rows); + + // store last states + ggml_build_forward_expand( + gf, ggml_cpy(ctx0, ggml_view_1d(ctx0, y_ssm, d_state * d_inner * n_seqs, x->nb[3] * x->ne[3]), + ggml_view_1d(ctx0, ssm_states_all, d_state * d_inner * n_seqs, + kv_head * d_state * d_inner * ggml_element_size(ssm_states_all)))); + + ggml_tensor * y = ggml_view_3d(ctx0, y_ssm, d_inner, n_seq_tokens, n_seqs, x->nb[2], x->nb[3], 0); + + // TODO: skip computing output earlier for unused tokens + + y = ggml_add(ctx0, y, ggml_mul(ctx0, cur, layer.ssm_d)); + y = ggml_swiglu_split(ctx0, ggml_cont(ctx0, z), y); + + // {d_inner, n_embd} @ {d_inner, n_seq_tokens, n_seqs} => {n_embd, n_seq_tokens, n_seqs} + cur = build_lora_mm(layer.ssm_out, y); + } + + // {n_embd, n_seq_tokens, n_seqs} => {n_embd, n_tokens} + cur = ggml_reshape_2d(ctx0, cur, cur->ne[0], n_seq_tokens * n_seqs); + + return cur; +} + +ggml_tensor * llm_graph_context_mamba::build_mamba2_layer(llm_graph_input_rs * inp, + ggml_tensor * cur, + const llama_model & model, + const llama_ubatch & ubatch, + int il) const { + const auto * mctx_cur = inp->mctx; + + const auto kv_head = mctx_cur->get_head(); + + const int64_t d_conv = hparams.ssm_d_conv; + const int64_t d_inner = hparams.ssm_d_inner; + const int64_t d_state = hparams.ssm_d_state; + const int64_t n_head = hparams.ssm_dt_rank; + const int64_t head_dim = d_inner / n_head; + const int64_t n_group = hparams.ssm_n_group; + const int64_t n_seqs = ubatch.n_seqs; + + const int64_t n_seq_tokens = ubatch.n_seq_tokens; + + GGML_ASSERT(n_seqs != 0); + GGML_ASSERT(ubatch.equal_seqs()); + GGML_ASSERT(ubatch.n_tokens == n_seq_tokens * n_seqs); + + ggml_tensor * conv_states_all = mctx_cur->get_r_l(il); + ggml_tensor * ssm_states_all = mctx_cur->get_s_l(il); + + ggml_tensor * conv = build_rs(inp, conv_states_all, hparams.n_embd_r(), n_seqs); + conv = ggml_reshape_3d(ctx0, conv, d_conv - 1, d_inner + 2 * n_group * d_state, n_seqs); + + // {n_embd, n_tokens} => {n_embd, n_seq_tokens, n_seqs} + cur = ggml_reshape_3d(ctx0, cur, cur->ne[0], n_seq_tokens, n_seqs); + + // d_in_proj = 2 * self.d_inner + 2 * self.ngroups * self.d_state + self.nheads + + // {n_embd, d_in_proj} @ {n_embd, n_seq_tokens, n_seqs} => {d_in_proj, n_seq_tokens, n_seqs} + ggml_tensor * zxBCdt = build_lora_mm(model.layers[il].ssm_in, cur); + + // split the above in three + ggml_tensor * z = ggml_view_4d(ctx0, zxBCdt, head_dim, n_head, n_seq_tokens, n_seqs, head_dim * zxBCdt->nb[0], + zxBCdt->nb[1], zxBCdt->nb[2], 0); + ggml_tensor * xBC = ggml_view_3d(ctx0, zxBCdt, d_inner + 2 * n_group * d_state, n_seq_tokens, n_seqs, zxBCdt->nb[1], + zxBCdt->nb[2], d_inner * ggml_element_size(zxBCdt)); + ggml_tensor * dt = ggml_view_3d(ctx0, zxBCdt, n_head, n_seq_tokens, n_seqs, zxBCdt->nb[1], zxBCdt->nb[2], + (2 * d_inner + 2 * n_group * d_state) * ggml_element_size(zxBCdt)); + + // conv + { + // => {d_conv - 1 + n_seq_tokens, d_inner + 2*n_group*d_state, n_seqs} + ggml_tensor * conv_x = ggml_concat(ctx0, conv, ggml_transpose(ctx0, xBC), 0); + + // copy last (d_conv - 1) columns back into the state cache + ggml_tensor * last_conv = ggml_view_3d(ctx0, conv_x, d_conv - 1, d_inner + 2 * n_group * d_state, n_seqs, + conv_x->nb[1], conv_x->nb[2], n_seq_tokens * (conv_x->nb[0])); + + ggml_build_forward_expand(gf, ggml_cpy(ctx0, last_conv, + ggml_view_1d(ctx0, conv_states_all, + (d_conv - 1) * (d_inner + 2 * n_group * d_state) * (n_seqs), + kv_head * (d_conv - 1) * (d_inner + 2 * n_group * d_state) * + ggml_element_size(conv_states_all)))); + + // 1D convolution + // The equivalent is to make a self-overlapping view of conv_x + // over d_conv columns at each stride in the 3rd dimension, + // then element-wise multiply that with the conv1d weight, + // then sum the elements of each row, + // (the last two steps are a dot product over rows (also doable with mul_mat)) + // then permute away the ne[0] dimension, + // and then you're left with the resulting x tensor. + // For simultaneous sequences, all sequences need to have the same length. + xBC = ggml_ssm_conv(ctx0, conv_x, model.layers[il].ssm_conv1d); + + // bias + xBC = ggml_add(ctx0, xBC, model.layers[il].ssm_conv1d_b); + + xBC = ggml_silu(ctx0, xBC); + } + + // ssm + { + // These correspond to V K Q in SSM/attention duality + ggml_tensor * x = ggml_view_4d(ctx0, xBC, head_dim, n_head, n_seq_tokens, n_seqs, head_dim * xBC->nb[0], + xBC->nb[1], xBC->nb[2], 0); + ggml_tensor * B = ggml_view_4d(ctx0, xBC, d_state, n_group, n_seq_tokens, n_seqs, d_state * xBC->nb[0], + xBC->nb[1], xBC->nb[2], d_inner * ggml_element_size(xBC)); + ggml_tensor * C = ggml_view_4d(ctx0, xBC, d_state, n_group, n_seq_tokens, n_seqs, d_state * xBC->nb[0], + xBC->nb[1], xBC->nb[2], (d_inner + n_group * d_state) * ggml_element_size(xBC)); + + // {n_head, n_seq_tokens, n_seqs} + dt = ggml_add(ctx0, ggml_cont(ctx0, dt), model.layers[il].ssm_dt_b); + + ggml_tensor * A = model.layers[il].ssm_a; + + // use the states and the indices provided by build_recurrent_state + // (this is necessary in order to properly use the states before they are overwritten, + // while avoiding to make unnecessary copies of the states) + auto get_ssm_rows = [&](ggml_context * ctx, ggml_tensor * states, ggml_tensor * ids) { + ggml_tensor * ssm = ggml_reshape_4d(ctx, states, d_state, head_dim, n_head, mctx_cur->get_size()); + + // TODO: use semistructured matrices to implement state-space duality + // => {d_inner, n_seq_tokens, n_seqs} and {d_state, d_inner, n_seqs} + return ggml_ssm_scan(ctx, ssm, x, dt, A, B, C, ids); + }; + + ggml_tensor * y_ssm = build_rs(inp, ssm_states_all, hparams.n_embd_s(), ubatch.n_seqs, get_ssm_rows); + + // store last states + ggml_build_forward_expand( + gf, ggml_cpy(ctx0, ggml_view_1d(ctx0, y_ssm, d_state * d_inner * n_seqs, ggml_nelements(x) * x->nb[0]), + ggml_view_1d(ctx0, ssm_states_all, d_state * d_inner * n_seqs, + kv_head * d_state * d_inner * ggml_element_size(ssm_states_all)))); + + ggml_tensor * y = ggml_view_4d(ctx0, y_ssm, head_dim, n_head, n_seq_tokens, n_seqs, x->nb[1], n_head * x->nb[1], + n_seq_tokens * n_head * x->nb[1], 0); + + // TODO: skip computing output earlier for unused tokens + + y = ggml_add(ctx0, y, ggml_mul(ctx0, x, model.layers[il].ssm_d)); + cb(y, "mamba2_y_add_d", il); + y = ggml_swiglu_split(ctx0, ggml_cont(ctx0, z), y); + + // grouped RMS norm + if (model.layers[il].ssm_norm) { + y = ggml_reshape_4d(ctx0, y, d_inner / n_group, n_group, n_seq_tokens, n_seqs); + y = build_norm(y, model.layers[il].ssm_norm, NULL, LLM_NORM_RMS, il); + } + + y = ggml_reshape_3d(ctx0, y, d_inner, n_seq_tokens, n_seqs); + + // {d_inner, n_embd} @ {d_inner, n_seq_tokens, n_seqs} => {n_embd, n_seq_tokens, n_seqs} + cur = build_lora_mm(model.layers[il].ssm_out, y); + } + + // {n_embd, n_seq_tokens, n_seqs} => {n_embd, n_tokens} + cur = ggml_reshape_2d(ctx0, cur, cur->ne[0], n_seq_tokens * n_seqs); + cb(cur, "mamba_out", il); + + return cur; +} |
