https://wccftech.com/nvidia-rtx-dlss-check-in-it-is-definitely-learning/

When NVIDIA announced their RTX lineup at Gamescom 2018 they also introduced what their RTX feature suite was. There was more than just DXR and Vulkan hardware-accelerated ray tracing support, as Deep Learning Super Sampling (DLSS) was another of the major features to be supported by the new GeForce RTX card lineup.

While the ray tracing support on the RTX cards was going to be aided by the dedicated RT cores and subsequently cleaned up with a realtime denoiser handled through the Tensor Cores brought over from the Volta architecture these AI accelerator cores would be pulling double duty with DLSS. As the name implies DLSS is a deep learning algorithm that can help pull off higher frame rates when enabled by rendering internally at a lower resolution and using the Tensor Cores to reconstruct the image at a comparable image quality to native resolution.