checkpointing

[cabjudo]

In the documentation on tf.train.Saver there's an option (keep_checkpoint every_n_hours)

"// How often to keep an additional checkpoint. If not specified, only the last
// "max_to_keep" checkpoints are kept; if specified, in addition to keeping
// the last "max_to_keep" checkpoints, an additional checkpoint will be kept
// for every n hours of training."
https://github.com/tensorflow/tensorflow/blob/r1.7/tensorflow/core/protobuf/saver.proto

Incorporation of this function would potentially improve logger