Computation times

00:34.547 total execution time for 5 files from auto_examples/basics:

Example	Time	Mem (MB)
Use iterative reconstruction algorithms (demo_custom_optim.py)	00:25.845	0.0
5 minute quickstart tutorial (demo_quickstart.py)	00:05.210	0.0
Use a pretrained model (demo_pretrained_model.py)	00:01.716	0.0
Bring your own dataset (demo_custom_dataset.py)	00:01.547	0.0
Bring your own physics (demo_custom_physics.py)	00:00.230	0.0