今天看了一篇介绍屏障法的文章，图文并茂，还有真代码一行一行解有约束的含有不等式的最优化问题。虽然标题有内点法，但是没有提内点法中的原始对偶方法。其实这两个方法都是在面对 KKT 条件的时候的思考，不过对对偶变量的处理看待角度不同，朴素的求解都是用牛顿法。如果你对普通的等式约束，KKT 条件，拉格朗日方法有了解的，这篇文章读起来就更容易了。https://towardsdatascience.com/how-to-solve-constrained-optimization-problem-the-interior-point-methods-1733095f9eb5
BY Data Science Archive
In many cases, the content resembled that of the marketplaces found on the dark web, a group of hidden websites that are popular among hackers and accessed using specific anonymising software.“We have recently been witnessing a 100 per cent-plus rise in Telegram usage by cybercriminals,” said Tal Samra, cyber threat analyst at Cyberint.The rise in nefarious activity comes as users flocked to the encrypted chat app earlier this year after changes to the privacy policy of Facebook-owned rival WhatsApp prompted many to seek out alternatives.
Pinterest (PINS) closed at $71.75 in the latest trading session, marking a -0.18% move from the prior day. This change lagged the S&P 500's daily gain of 0.1%. Meanwhile, the Dow gained 0.9%, and the Nasdaq, a tech-heavy index, lost 0.59%. Heading into today, shares of the digital pinboard and shopping tool company had lost 17.41% over the past month, lagging the Computer and Technology sector's loss of 5.38% and the S&P 500's gain of 0.71% in that time. Investors will be hoping for strength from PINS as it approaches its next earnings release. The company is expected to report EPS of $0.07, up 170% from the prior-year quarter. Our most recent consensus estimate is calling for quarterly revenue of $467.87 million, up 72.05% from the year-ago period.
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