The Image in the Tensorboard only show discrete steps

[KingofAsianPopJC]

I trained a network for 90 epochs, and I saved the last batch in each epochs to the log file. However, when I open the Tensorboard , in the column of Image, only several steps(epochs)showed (like steps 50, steps68), So how can I see the images of every epochs? /home/lx/Pictures/Screenshot from 2018-10-13 15-01-34.png