Pushing bug fix for shuffle #312

Job	Run time
main (introductory/Part_4_*.ipynb)	9m 40s
main (introductory/Part_2_*.ipynb)	2m 13s
main (specialised/Comparing_Models_with_RegressionSuite.ipynb)	2m 49s
main (introductory/Part_3_*.ipynb)	14m 48s
main (introductory/Part_5_*.ipynb)	2m 41s
main (introductory/Part_6_*.ipynb)	28m 6s
main (introductory/Part_1_*.ipynb)	2m 8s
	1h 2m 25s

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