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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-cuda/ggml-cuda.cu
+6
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@@ -5189,11 +5189,17 @@ static bool ggml_backend_cuda_device_supports_op(ggml_backend_dev_t dev, const g
(op->src[1]->type == GGML_TYPE_F32 || op->src[1]->type == GGML_TYPE_F16) &&
(op->type == GGML_TYPE_F32 || op->type == GGML_TYPE_F16);
case GGML_OP_SSM_SCAN: {
const int32_t K = ggml_get_op_params_i32(op, 0);
if (op->src[3]->ne[0] == 1) {
// Mamba2
// (kernel only supports (d_state == 128 || d_state == 256) && d_head % 16 == 0)
return (op->src[0]->ne[0] == 128 || op->src[0]->ne[0] == 256) && op->src[0]->ne[1] % 16 == 0;
} else {
if (K > 1) {
return false;
}
// Mamba
// (kernel only supports d_state == 16, d_head == 1, n_head % 128 == 0, n_group == 1)
return op->src[0]->ne[0] == 16 && op->src[0]->ne[1] == 1 && op->src[0]->ne[2] % 128 == 0 && op->src[4]->ne[1] == 1;