Pass filename components into Checkpoint.load_objects

🚀 Feature

Currently, objects can be loaded like this:

from ignite.handlers import Checkpoint

Checkpoint.load_objects(to_load=to_load, checkpoint=checkpoint_fp)

It would be nice to have the following as an option:

from ignite.handlers import Checkpoint

checkpointer = Checkpoint(...)
checkpointer.load_objects(to_load=to_load, filename_components={"name": name, "global_step": global_step})

In other words, pass in components of self.filename_pattern. The Checkpoint object already has self.filename_pattern, self.filename_prefix, self.ext, and it should also have the dirname that is passed into __init__. So most of the components of constructing the filename are already defined in the Checkpoint object. Getting the user to recreate the full file path is unnecessary.

[vfdev-5]

@sdesrozis looks good to me as well. I was also wondering if we could make the method signature as

def reload_objects(self, to_load: Mapping, **filename_components, load_kwards: Optional[Dict] = None) -> None:

basically, fetching filename_components as kwargs and rarely used load_kwards as a dict

[vfdev-5]

I see, that makes sense. Let me see what can be done for that.