{"id":2198,"date":"2020-09-30T12:34:25","date_gmt":"2020-09-30T12:34:25","guid":{"rendered":"https:\/\/data-science.gotoauthority.com\/2020\/09\/30\/illustrative-introductions-on-dimension-reduction\/"},"modified":"2020-09-30T12:34:25","modified_gmt":"2020-09-30T12:34:25","slug":"illustrative-introductions-on-dimension-reduction","status":"publish","type":"post","link":"https:\/\/wealthrevelation.com\/data-science\/2020\/09\/30\/illustrative-introductions-on-dimension-reduction\/","title":{"rendered":"Illustrative introductions on dimension reduction"},"content":{"rendered":"
\n

\u201cWhat is your image on dimensions?\u201d
\u2026.That might be a cheesy question to ask to reader of Data Science Blog, but most people, with no scientific background, would answer \u201cOne dimension is a line, and two dimension is a plain, and we live in three-dimensional world.\u201d After that if you ask \u201cHow about the fourth dimension?\u201d many people would answer \u201cTime?\u201d<\/p>\n

Terms like \u201cmulti dimensional something\u201d is often used in science fictions because it\u2019s a convenient black box when you make a fantasy story, and I\u2019m sure many authors would not have thought that much about what those dimensions are.<\/p>\n

In Japanese, if you say \u201cHe likes two dimension.\u201d that means he prefers anime characters to real women, as is often the case with Japanese computer science students.<\/p>\n

The meanings of \u201cdimensions\u201d depend on the context, but in data science dimension is in short the number of rows of your Excel data.\"\"<\/p>\n

When you study data science or machine learning, usually you should start with understanding the algorithms with 2 or 3 dimensional data, and you can apply those ideas to any D dimensional data.
But of course you cannot visualize D dimensional data anymore, and that is almost an imaginary world on blackboards.<\/p>\n

In this blog series I am going to explain algorithms for dimension reductions, such as PCA, LDA, and t-SNE, with 2 or 3 dimensional visible data. Along with that, I am going to delve into the meaning of calculations so that you can understand them in more like everyday-life sense.<\/p>\n

This article series is going to be roughly divided into the contents below.<\/strong><\/h4>\n
    \n
  1. Curse of Dimensionality (to be published soon)<\/li>\n
  2. PCA, LDA (to be published soon)<\/li>\n
  3. Rethinking eigen vectors (to be published soon)<\/li>\n
  4. KL expansion and subspace method (to be published soon)<\/li>\n
  5. Autoencoder as dimension reduction (to be published soon)<\/li>\n
  6. t-SNE (to be published soon)<\/li>\n<\/ol>\n

    I hope you could see that reducing dimension is one of the fundamental approaches in data science or machine learning.<\/p>\n

    \n

    Yasuto Tamura<\/a><\/h3>\n
    \"Yasuto<\/div>\n

    <\/a><\/a><\/p>\n

    Data Science Intern at DATANOMIQ<\/a>.
    \nMajoring in computer science. Currently studying mathematical sides of deep learning, such as densely connected layers, CNN, RNN, autoencoders, and making study materials on them. Also started aiming at Bayesian deep learning algorithms.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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