A awesome question to practice Union data structure and searching methods — Please skip this part if you want to go straight to this question First of all, I am finally back to writing articles. These days I have been stuck in work and podcasts. That’s right; now I have my podcasts, mainly about travel, cool stories, and life. So if you…

「辣雞翅」是Henry對於紐奧良的唯一印象（可能再加上一點爵士樂） 但是藉由Ray的實地探訪，才發現紐奧良更多值得深挖的神秘之處！

A must-know optimization method — Gradient descent is a common optimization method in machine learning. However, same as many machine learning algorithms, we normally know how to use it but do not understand the mathematical background. This article will thoroughly explain the math behind gradient descent. Cost Function and Optimization of Weight When measuring the performance of algorithms, we use different…

Data analyst daily algorithm — As a data analyst, a part of my job is to solve some novel data science questions. One project that I was working on these days was creating a program that could match strings for two tables. We used the fuzzywuzzy package Python. …

Motivation, Hypothesis, and Regularization — This article covers the motivation for using neural network algorithms, the basic idea of NNet, and how we regularize it. Start from the beginning: What is perceptron? Perceptron is the basic unit in the neural network. Every perceptron is like a linear function with a threshold. When we feed the perceptron, it must pass the threshold to…

A must-know machine learning algorithm: Day 2 — This series will focus on the implementation of different machine learning algorithms In the last article, we talked about the decision stump. Decision Stump A must-know machine learning algorithm : Day 1medium.com In this article, I will first introduce the decision tree, an algorithm that uses the concept of a decision stump. …

Let us combine two algorithms together — What is RBF RBF is the abbreviation of Radial Basis Function. We can further split RBF into two concepts. Radial Function The value at each point depends only on the distance between that point and the origin. For example, sqrt(x²+y²) is a radial function. Basis Function Basis function means a combination of functions. …

Hi! This is Ray — Who am I? First of all, I am a data analyst. Second of all, I am Asian. Now I know that in your mind, I might look like the nerdiest guy in your class, wearing thick-ass glasses and always sitting in the classroom front row. Well, fifty percent of that was correct; I…