LearningRate
	
abstract type defined in module 
	FluxTraining
			abstract type LearningRate <: HyperParameter
Hyperparameter for the optimizer's learning rate.
			See 
	
			
			Scheduler and 
	
			hyperparameter scheduling.
The following pages link back here:
training/onecycle.jl , FluxTraining.jl , callbacks/hyperparameters.jl