@mark_jimenez this is a known issue, because NNPACK doesn’t support the iOS simulator architecture, as is shown here - https://github.com/Maratyszcza/NNPACK 7 . So for the simulator build, operators are not being run via NNPACK. However, @AshkanAliabadi in our team has been actively working on XNNPACK, which will replace NNPACK in the future. Sorry for the inconvenience.