PyTorch Docs translation

PyTorch Docs translation

Module	Class	Translation Link
torch	BMM	PyTorch bmm()
torch	DIV	PyTorch div()
torch	EXP	PyTorch exp()
torch	POW	PyTorch pow()
torch.nn	INSTANCENORM2D	PyTorch InstanceNorm2d()
torch.nn	REFLECTIONPAD2D	PyTorch ReflectionPad2d()
torch.distributed	DISTRIBUTED COMMUNICATION PACKAGE - TORCH.DISTRIBUTED	PyTorch DISTRIBUTED COMMUNICATION PACKAGE - TORCH.DISTRIBUTED