StyleGAN depends on Nvidia's CUDA software, GPUs, and Google's TensorFlow,[4] or Meta AI's PyTorch, which supersedes TensorFlow as the official implementation library in later StyleGAN versions.[5] The second version of StyleGAN, called StyleGAN2, was published on February 5, 2020. It removes some of the characteristic artifacts and improves the image quality.[6][7] Nvidia introduced StyleGAN3, described as an "alias-free" version, on June 23, 2021, and made source available on October 12, 2021.[8]