Does a praying mantis go through complete or incomplete metamorphosis?

Because it has a nymph stage (small version of an adult) instead of a pupae or cocooning stage in the complete. Also, the complete has a larval stage from which it changes from. Incomplete is egg->nymph->adult, while complete is egg->larva-> pupae->adult. The complete varies much from it's starting larval stage while incomplete is mostly unchanged in appearance.