K_packed = original_K // 2. The scale factor dimension is K_sf = ceil_div(original_K, 16) = ceil_div(K_packed * 2, 16) = ceil_div(K_packed, 8). The previous code used ceil_div(K_packed, 16) which was wrong.
K_packed = original_K // 2. The scale factor dimension is K_sf = ceil_div(original_K, 16) = ceil_div(K_packed * 2, 16) = ceil_div(K_packed, 8). The previous code used ceil_div(K_packed, 16) which was wrong.