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GBDT

Written by  on November 1, 2018

梯度提升决策树(Gradient Boosting Decision Tree, GBDT)是一种基于提升决策树(Boosting Tree)的模型以分类回归决策树(Classification and Regression Tree, CART)作为基本分类器的模型。

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Word2Vec

Written by  on October 28, 2018

Word2Vec算法是NLP领域一个里程碑式的工作,它可以通过训练把文本内容映射到一个K维的向量,这样就很方便继续在其他一些算法领域里面使用,比如推荐系统或者广告点击率预估等等。它是在2013年由当时还在Google工作的Tomas Mikolov发表,主要两篇论文是《Distributed Representations of Words and Phrases and their Compositionality》和《Efficient Estimation of Word Representations in Vector Space》.

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Logistic Regression

Written by  on October 6, 2018

逻辑斯谛回归因为其易于实现,可解释性强,已经成为了工业界应用最广泛的机器学习算法。这篇文章主要讨论的是二项逻辑斯谛回归 (binominal logistic regression),以下简称LR。

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TIME

Written by  on September 28, 2018

Money is not evil by itself. It’s just paper with perceived value to obtain other things we value in other ways. If not money – what is evil you may ask?

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素描心得

Written by  on August 18, 2018

去年国庆的时候的在798里面的一个画室里面报了一个素描班,上个星期终于把两期课程学完了,总共画了二十多节课,从一开始的不知所措,到最后多少可以的画的有模有样,也算是没有白上,今天想着还是总结一下心得比较好,便于后面继续自学进步。

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POJ3020

Written by  on August 14, 2018

POJ3020 Antenna Placement Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 10821 Accepted: 5324 Description The Global Aerial Research Centre has been allotted the task of building the fifth generation of mobile phone nets in Sweden. The most striking reason why they got the job, is their discovery of a new, highly noise resistant, antenna. It is called 4DAir, and comes in four types. Each type can only transmit and receive signals in a direction aligned with a (slightly skewed) latitudinal and longitudinal grid, because of the interacting electromagnetic field of the earth. The four types correspond to antennas operating in the directions north, west, south, and east, respectively. Below is an example picture of places of interest, depicted by twelve small rings, and nine 4DAir antennas depicted by ellipses covering them.

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POJ3041

Written by  on August 14, 2018

POJ3041 Asteroids Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 26141 Accepted: 14134 Description Bessie wants to navigate her spaceship through a dangerous asteroid field in the shape of an N x N grid (1 <= N <= 500). The grid contains K asteroids (1 <= K <= 10,000), which are conveniently located at the lattice points of the grid.

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青岛游记

Written by  on August 11, 2018

上周在北京被热懵了(愧为蓝方人!),就想着出去小游一下避避暑,先想着去泰山,结果买不到票,然后又看了看东边的上海,南边的武汉,西边的西安,北边的大连,都热的冒烟,最后干脆就近选了青岛,毕竟海边城市,不会太热。

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苏杭游记

Written by  on August 8, 2018

太太在去过广州深圳之后,便对南方多有思念,对杭州尤其牵肠挂肚,杭州于她心中俨然已成了鸟语花香的同义词,清明假期前两周,她就说想去那边看看,我一想,干脆就在后来两周疯狂加班,把手上的活都给结了,然后请个年假凑了个八天大长假陪着她过去了。

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多线路部署博客

Written by  on July 14, 2018

现在博客支持多线路不同机房访问了,没搞太复杂,给Mysql起了个从服务器,然后直接rsync附件,国内流量会解析到阿里云机房,国外流量则解析到Vultr机房,虽然这本来就没多少人看,但该折腾的还是折腾下吧!

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