Where are these checkpoints?

[Learningm]

I tried the repo but encountering some problem, it seems missing checkpoints.

I found in the colab demo, the model.ckpt-239999 are successfully loaded.
INFO:tensorflow:Restoring parameters from train_dir_initFlow_Fence/model.ckpt-239999
INFO:tensorflow:Restoring parameters from train_dir_imgReconstruction_Fence/model.ckpt-239999

What are these checkpoints? I downloaded the ckpt.zip and unzip it, get some checkpoints with 'ckpt_' prefix.

Thanks.