testmode!
	
function defined in module 
	Flux
			testmode!(m, mode = true)
			Set a layer or model's test mode (see below). Using 
			:auto mode will treat any gradient computation as training.
Note: if you manually set a model into test mode, you need to manually place it back into train mode during training phase.
Possible values include:
			
			false for training
			
			true for testing
			
			:auto or 
			nothing for Flux to detect the mode automatically
There are
			6
			methods for Flux.testmode!:
		
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