ggml : add GGML_OP_LIGHTNING_INDEXER that implements DeepSeek V3.2/V4 lightning indexer (#24231)

* ggml : add GGML_OP_LIGHTNING_INDEXER that implements DeepSeek V3.2/V4 lightning indexer

* ggml : remove scale parameters from lightning indexer OP, add f16 mask parameter

* tests : add GGML_OP_LIGHTNING_INDEXER tests

* ggml : bump RPC version

* chore : check if lightning indexer input tensors are not transposed

* tests : count flops instead of bandwidth in lightning indexer test

* chore : add missing const

* chore : whitespace

* ggml : renamed variables in CPU lightning indexer implementation

* ggml : fix lightning indexer mask broadcasting

* tests : tests for lightning indexer mask broadcasting

* chore : whitespace

* llama : use GGML_OP_LIGHTNING_INDEXER in DeepSeek V3.2 and DeepSeek V4 models

---------

Co-authored-by: Stanisław Szymczyk <sszymczy@gmail.com>

ggml/src/ggml-cpu/ggml-cpu.c

@@ -2060,6 +2060,10 @@ static void ggml_compute_forward(struct ggml_compute_params * params, struct ggm
             {
                 ggml_compute_forward_gated_delta_net(params, tensor);
             } break;
+        case GGML_OP_LIGHTNING_INDEXER:
+            {
+                ggml_compute_forward_lightning_indexer(params, tensor);
+            } break;
         case GGML_OP_MAP_CUSTOM1:
             {
                 ggml_compute_forward_map_custom1(params, tensor);
@@ -2380,6 +2384,7 @@ static int ggml_get_n_tasks(struct ggml_tensor * node, int n_threads) {
         case GGML_OP_FLASH_ATTN_BACK:
         case GGML_OP_SSM_CONV:
         case GGML_OP_SSM_SCAN:
+        case GGML_OP_LIGHTNING_INDEXER:
             {
                 n_tasks = n_threads;
             } break;
@@ -2965,6 +2970,12 @@ struct ggml_cplan ggml_graph_plan(
                     {
                         GGML_ABORT("fatal error");
                     }
+                case GGML_OP_LIGHTNING_INDEXER:
+                    {
+                        // temp buffer for dequantizing lightning indexer keys
+                        const int64_t ne10 = node->src[1]->ne[0];
+                        cur += sizeof(float)*ne10*n_tasks;
+                    } break;
                 default:
                     break;
             }