WGAN-GP loss function : Equation is not same as presented in WGAN-GP paper

[shubham-malaviya]

In Model/gan.py line #177 and #178 :

differences = self.fake_data - self.real_data
interpolates = self.real_data + (alpha * differences)

According to my understanding of WGAN-GP paper interpolates should be
interpolates = self.fake_data + (alpha * differences)
and differences should be
differences = self.real_data - self.fake_data

is my understanding right? please correct me if I'm wrong.