Monthly Archives: December 2018

Visualizing operating characteristic curve with TI Nspire

In the study of quality control, sampling is an important technique to assess the overall quality level of a lot of production run. Operating characteristic curve is a great tool to understand the quality profile of acceptance sampling.

In TI Nspire, the OC curve can be defined as following using binomial distribution as an alternative to hypergeometric distribution.

oc-1

With the function defined, visualizing of 10% failure rate and sampling size of 20 can be done by graphing this function.

oc-2

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Interesting applications of Generative Adversarial Network to crack CAPTCHA

Interesting results from a recent paper presented at the 25th ACM conference on Computer and Communications Security shown advances in Generative Adversarial Network (GAN). In particular the paper focused on tackling Captcha with GAN. GANs take a game theory approach in the training of network and during the deep learning process two entities compete in a game that one trying to fool the other while the other strives not to be fooled.

Comparison of performance of machine learning the probability distributions are usually considered as metrics for benchmark. One such commonly used is the Jensen–Shannon Divergence and a generalization can be given as

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