vhe.py encrypt() not working well

[Gaopeng-Bai]

This error appeared uncertainly that sometime working well, sometime not, when use encrypt(T, a) function with s.shape=(150,1), a.shape=(150, ). 

 "IndexError: index 22500 is out of bounds for axis 0 with size 22500"

Computer count from 0, so a list or numpy with size 22500 has the members d[0]..d[22499]. Index 22500 is definitely false to access numpy. But in this algorithm the reason unknow.

[gradient-secure-cifar100] utils/vhe.py (Line 63)

            result[i * l + j] = sign * int(bin(value)[length1 - j + 1])

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[Gaopeng-Bai]

Change l pareameter to 200 could be better