Save checkpoint for the last epoch

[ternaus]

How to save the checkpoint only for the last epoch?
In the docs:

if save_top_k == k, the best k models according to the quantity monitored will be saved. if save_top_k == 0, no models are saved. if save_top_k == -1, all models are saved. Please note that the monitors are checked every period epochs. if save_top_k >= 2 and the callback is called multiple times inside an epoch, the name of the saved file will be appended with a version count starting with v0.

• k = 0 does not save any.
• k > 1 saves only a few the best
• k = -1 saves all of them

Currently, I am using k = -1, but it space consuming.

[lgvaz]

PR #1908 will add that option with a save_last argument to ModelCheckpoint =)