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reorg code and first implementation of the new easy API #243

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Run time

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Job	Run time
formatting / formatting	12s
formatting / formatting	12s
formatting / formatting	12s
nvidia-gpu / intra-layer	3m 29s
nvidia-gpu / intra-layer	11s
nvidia-gpu / intra-layer	3m 30s
nvidia-gpu / inter-layer (1)	1s
nvidia-gpu / inter-layer (1)	1s
nvidia-gpu / inter-layer (1)	6s
nvidia-gpu / inter-layer (2)	4s
nvidia-gpu / inter-layer (2)	12s
nvidia-gpu / inter-layer (2)	1s
	8m 11s