Book05 recommendation systems: GPU version loss convergence comparison.

[peterzhang2029]

Train avg_cost:

Pass	V2(GPU)	Fluid(GPU)
0	4.226966	4.16706371
1	3.779494	3.80107117
2	3.467989	3.51753068
3	3.296482	3.30209255
4	3.226758	3.19562411

Test avg_cost:

Pass	V2(GPU)	Fluid(GPU)
0	3.830757	3.843338
1	3.587178	3.665707
2	3.371065	3.390050
3	3.323481	3.319620
3	3.299066	3.293895

[shanyi15]

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