Pushing bug fix for shuffle #313

Job	Run time
main (specialised/Comparing_Models_with_RegressionSuite.ipynb)	2m 59s
main (introductory/Part_6_*.ipynb)	28m 6s
main (introductory/Part_5_*.ipynb)	3m 0s
main (introductory/Part_2_*.ipynb)	1m 53s
main (introductory/Part_4_*.ipynb)	9m 45s
main (introductory/Part_3_*.ipynb)	16m 0s
main (introductory/Part_1_*.ipynb)	2m 2s
	1h 3m 45s

Provide feedback