model-loader : fix quantized reshaped tensor strides (#26672)

diff --git a/src/llama-model-loader.cpp b/src/llama-model-loader.cpp
index b31e92e2da7ef42eabbb47173bb1f2088c952f39..71bc9f7ef0aaa883f046537c0a28803bdb39754d 100644 (file)
--- a/src/llama-model-loader.cpp
+++ b/src/llama-model-loader.cpp
@@ -1249,7 +1249,13 @@ struct ggml_tensor * llama_model_loader::create_tensor(
         for (size_t dim = 0; dim < GGML_MAX_DIMS; dim++) {
             t_meta.ne[dim] = dim < ne.size() ? ne.begin()[dim] : 1;
             GGML_ASSERT(t_meta.ne[dim] >= 1);
-            t_meta.nb[dim] = dim == 0 ? ggml_type_size(type) : t_meta.ne[dim-1]*t_meta.nb[dim-1];
+            if (dim == 0) {
+                t_meta.nb[dim] = ggml_type_size(type);
+            } else if (dim == 1) {
+                t_meta.nb[dim] = ggml_row_size(type, t_meta.ne[dim-1]);
+            } else {
+                t_meta.nb[dim] = t_meta.nb[dim-1]*t_meta.ne[dim-1];
+            }
             GGML_ASSERT(t_meta.nb[dim] >= 1);
         }
         ggml_set_name(&t_meta, tn.str().c_str());
@@ -1272,10 +1278,18 @@ struct ggml_tensor * llama_model_loader::create_tensor(
     if (flags & TENSOR_ALLOW_RESHAPE) {
         for (size_t dim = 0; dim < GGML_MAX_DIMS; dim++) {
             t_meta.ne[dim] = dim < ne.size() ? ne.begin()[dim] : 1;
-            t_meta.nb[dim] = dim == 0 ? ggml_type_size(t_meta.type) : t_meta.ne[dim-1]*t_meta.nb[dim-1];
+            if (dim == 0) {
+                t_meta.nb[dim] = ggml_type_size(t_meta.type);
+            } else if (dim == 1) {
+                t_meta.nb[dim] = ggml_row_size(t_meta.type, t_meta.ne[dim-1]);
+            } else {
+                t_meta.nb[dim] = t_meta.ne[dim-1]*t_meta.nb[dim-1];
+            }
         }
     }
 
+    GGML_ASSERT(ggml_nbytes(&t_meta) == ggml_nbytes(cur));
+
     ggml_backend_buffer_type_t buft = buft_for_tensor(&t_meta);
     if (buft == nullptr) {
         return nullptr;