If you don't report to the leader after training, will it leave a bad impression on the leader?

Hello, in fact, the leader doesn't care whether you go or not to say hello to him, but feels embarrassed not to go.

However, since leaders want to develop you and let you receive training, why not say thank you? The leader arranged for me to attend this training, and I learned a lot. Thank you for giving me this opportunity. I will work harder to improve myself in the future and live up to the trust of the leaders. . . . What's so hard about smiling?