tests : add non-cont K,V FA tests

ggml-ci

Author: ggerganov

tests/test-backend-ops.cpp

@@ -4258,26 +4258,32 @@ struct test_flash_attn_ext : public test_case {
         const int64_t hsk_padded = GGML_PAD(hsk, ggml_blck_size(type_KV));
         const int64_t hsv_padded = GGML_PAD(hsv, ggml_blck_size(type_KV));
 
-        auto const &create_permuted = [&](ggml_type type, int64_t ne0, int64_t ne1, int64_t ne2, int64_t ne3) -> ggml_tensor * {
+        auto const &create_permuted = [&](ggml_type type, int64_t ne0, int64_t ne1, int64_t ne2, int64_t ne3, bool is_view) -> ggml_tensor * {
             int64_t ne[4] = {ne0, ne1, ne2, ne3};
             int64_t ne_perm[4];
             for (int i = 0; i < 4; ++i) {
                 ne_perm[permute[i]] = ne[i];
             }
-            ggml_tensor * t = ggml_new_tensor_4d(ctx, type, ne_perm[0], ne_perm[1], ne_perm[2], ne_perm[3]);
+            ggml_tensor * t;
+            if (is_view) {
+                ggml_tensor * t0 = ggml_new_tensor_4d(ctx, type, ne_perm[0], 2*ne_perm[1], ne_perm[2], ne_perm[3]);
+                t = ggml_view_4d(ctx, t0, ne_perm[0], ne_perm[1], ne_perm[2], ne_perm[3], t0->nb[1], t0->nb[2], t0->nb[3], 0);
+            } else {
+                t = ggml_new_tensor_4d(ctx, type, ne_perm[0], ne_perm[1], ne_perm[2], ne_perm[3]);
+            }
             if (permute != std::array<int32_t, 4>{0, 1, 2, 3}) {
                 t = ggml_permute(ctx, t, permute[0], permute[1], permute[2], permute[3]);
             }
             return t;
         };
 
-        ggml_tensor * q = create_permuted(GGML_TYPE_F32, hsk_padded, nb, nh*nr23[0], nr23[1]);
+        ggml_tensor * q = create_permuted(GGML_TYPE_F32, hsk_padded, nb, nh*nr23[0], nr23[1], false);
         ggml_set_name(q, "q");
 
-        ggml_tensor * k = create_permuted(type_KV,       hsk_padded, kv, nh,         nr23[1]);
+        ggml_tensor * k = create_permuted(type_KV,       hsk_padded, kv, nh,         nr23[1], true); // the K tensor is usually a view of the K cache
         ggml_set_name(k, "k");
 
-        ggml_tensor * v = create_permuted(type_KV,       hsv_padded, kv, nh,         nr23[1]);
+        ggml_tensor * v = create_permuted(type_KV,       hsv_padded, kv, nh,         nr23[1], true); // the V tensor is usually a view of the V cache
         ggml_set_name(v, "v");
 
         ggml_tensor * m = nullptr;