added update_select_rows for select_linear:update speed-up

1 files changed, 14 insertions, 0 deletions

diff --git a/nerv/matrix/generic/cumatrix.c b/nerv/matrix/generic/cumatrix.c
index 08cb4c2..623352e 100644
--- a/nerv/matrix/generic/cumatrix.c
+++ b/nerv/matrix/generic/cumatrix.c
@@ -291,6 +291,19 @@ static int nerv_matrix_(lua_scale_rows_by_row)(lua_State *L) {
     return 0;
 }
 
+static int nerv_matrix_(lua_update_select_rows)(lua_State *L) {
+    //Update c's select rows, i.e. c[idx[i]] = c[idx[i]] * (1 - beta * alpha) + a[i] * alpha
+    Status status;
+    Matrix *c = luaT_checkudata(L, 1, nerv_matrix_(tname));
+    const Matrix *a = luaT_checkudata(L, 2, nerv_matrix_(tname));
+    const Matrix *idx = luaT_checkudata(L, 3, nerv_matrix_(tname));
+    MATRIX_ELEM alpha = luaL_checknumber(L, 4);
+    MATRIX_ELEM beta = luaL_checknumber(L, 5);
+    nerv_matrix_(update_select_rows)(c, a, idx, alpha, beta, &status);
+    NERV_LUA_CHECK_STATUS(L, status);
+    return 0;
+}
+
 static const luaL_Reg nerv_matrix_(extra_methods)[] = {
     {"colsum", nerv_matrix_(lua_colsum)},
     {"colsame", nerv_matrix_(lua_colsame)},
@@ -310,6 +323,7 @@ static const luaL_Reg nerv_matrix_(extra_methods)[] = {
     {"add_row", nerv_matrix_(lua_add_row)},
     {"clip", nerv_matrix_(lua_clip)},
     {"fill", nerv_matrix_(lua_fill)},
+    {"update_select_rows", nerv_matrix_(lua_update_select_rows)},
     {"sigmoid", nerv_matrix_(lua_sigmoid)},
     {"sigmoid_grad", nerv_matrix_(lua_sigmoid_grad)},
     {"softmax", nerv_matrix_(lua_softmax)},