Evaluating Parzen window log-likelihood for GANs

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I am trying to reimplement the original GAN paper by Ian Goodfellow et al. And I need to show that my implementation achieves same or similar results as the authors achieved. But I am not sure how to evaluate this metric. I took a look at their implementation but I got some funny results. In the paper they report 225 +- 2 on the MNIST for this metric, while the results I get are bellow -400000000. I thought that maybe the model is bad, but it generates really good images of MNIST digits.

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