ggml : add ggml_is_contiguous_rows

Author: ggerganov

ggml/include/ggml.h

@@ -688,6 +688,9 @@ extern "C" {
     // true for tensor that is stored in memory as CxWxHxN and has been permuted to WxHxCxN
     GGML_API bool ggml_is_contiguous_channels(const struct ggml_tensor * tensor);
 
+    // true if the elements in dimension 0 are contiguous, or there is just 1 element
+    GGML_API bool ggml_is_contiguous_rows(const struct ggml_tensor * tensor);
+
     GGML_API bool ggml_are_same_shape (const struct ggml_tensor * t0, const struct ggml_tensor * t1);
     GGML_API bool ggml_are_same_stride(const struct ggml_tensor * t0, const struct ggml_tensor * t1);
 

ggml/src/ggml.c

@@ -1353,6 +1353,12 @@ bool ggml_is_contiguous_channels(const struct ggml_tensor * tensor) {
         tensor->nb[2] == ggml_type_size(tensor->type);
 }
 
+bool ggml_is_contiguous_rows(const struct ggml_tensor * tensor) {
+    return
+        tensor->ne[0] == 1 ||
+        tensor->ne[0]*tensor->nb[0] == tensor->nb[1];
+}
+
 static inline bool ggml_is_padded_1d(const struct ggml_tensor * tensor) {
     static_assert(GGML_MAX_DIMS == 4, "GGML_MAX_DIMS is not 4 - update this function");