com.apple.photomodel uses 38GB real memory or 198GB virtual memory even after Photos closed on High Sierra

I didn't have a hope that the Photos app on OS X would use less memory because I have a hope that macOS Sierra would have fixed the memory management for the Photos app. I was wrong. Then I have a "High" hope that macOS "High" Sierra should eventually fix the memory black hole but should I have that hope?

Today I ran Photos app on macOS 10.13 with Supplementary Update. After a while, I walked on the keyboard like walking on swamp. Every character came out on the i7 7700K iMac not within a minute. I opened the Activity Monitor, and 38GB out of 40GB were used. The com.apple.photomodel process even takes up to 198GB of memory and 99% of CPU, three hours after I quitted Photos app which I let it run for 4 hours doing nothing else on the iMac.

Memory Clean 2 in Extreme Clean mode claims back 2 GB only.

Is it because of the Hunger Games, Big Data being collected or Machine Learning mode of the Photos app Version 3.0 (3201.11.120)?