Blob ternarization

[HahTK]

In the Blob::TernaryToProto() function we seem to be using 0.5*alpha as delta instead of the actual value of delta. Is there a reason for doing it this way ?

const double* data_vec = cpu_binary();
for (int i = 0; i < count_; i += 16) {
unsigned int n = 0;
for(int j=0; j<16 && (i+j)<count_; j++){
int b1 = data_vec[i+j] > -0.5alpha ? 1 : 0;
int b2 = data_vec[i+j] > 0.5alpha ? 1 : 0;
n ^= (b1 << (2j));
n ^= (b2 << (2j+1));
}
proto->add_ternary_data(n);
}