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ggml : recurrent state rollback for ggml_ssm_scan (#26623)

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* Initial changes for Recurrent state rollback for nemotron for cpu and cuda

* Removing CPU RS rollback. Will enable it in subsequent PRs

* addition of test case

* Removing assert and calling runtime API to check if op is supported

* removing extra API and updating the call sites for K

* replace static cuda detection to runtime fused_op api

* address review comments and fallback when SSM rollback not supprted

* Adding changes for supporting RS-rollback in CPU. Also added test-backend-ops for cpu and cuda

* removing memory manipulation as rs rollback is now supported in CPU

* removing the static probe which is not needed now

* correcting the format

* address review comments

* enabling test for all the backends, unsupported backends will fallback to CPU

* Apply suggestions from code review

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>

* choose different graph based on the result of fused_ssm_op is supported or not and also handled memory->n_rs_seq >1 case incase of op is not supported

* Support K > 1 in ssm_scan for all backends

* Fix CI Issues

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
Co-authored-by: Gaurav Garg <gaugarg@nvidia.com>
This commit is contained in:
lnigam
2026-08-14 17:20:40 +03:00
committed by GitHub
co-authored by Georgi Gerganov Gaurav Garg
parent 4c1a0af40d
commit 1692f9e50b
25 changed files with 291 additions and 43 deletions
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ggml/src/ggml-metal/ggml-metal-ops.cpp
+5
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@@ -1710,6 +1710,10 @@ int ggml_metal_op_ssm_scan(ggml_metal_op_t ctx, int idx) {
const int64_t n_group = ne41;
const int64_t n_seq_tokens = ne12;
const int64_t n_seqs = ne13;
const int64_t K = ggml_get_op_params_i32(op, 0);
GGML_ASSERT(K >= 1);
GGML_ASSERT(ggml_nelements(op->src[1]) + K*d_state*d_inner*n_head*n_seqs == ggml_nelements(op));
ggml_metal_kargs_ssm_scan args = {
/*.d_state =*/ d_state,
@@ -1718,6 +1722,7 @@ int ggml_metal_op_ssm_scan(ggml_metal_op_t ctx, int idx) {
/*.n_group =*/ n_group,
/*.n_seq_tokens =*/ n_seq_tokens,
/*.n_seqs =*/ n_seqs,
/*.K =*/ K,
/*.s_off =*/ ggml_nelements(op->src[1]) * sizeof(float),
/*.nb00 =*/ nb00,
/*.nb01 =*/ nb01,