To thrive in calamity or perish in soft living. — Mencius

然後知生於憂患而死於安樂也。— 孟子《告子下》

About

Hello and welcome, I am Johnny and I am a Machine Learning Developer. I started my Data Science and Machine Learning journey in 2017, at that time the knowledges was pieces by pieces and sometimes I really forgot what I have learned, and some “ah-ha” moments will escaped from the finger tips if I didn’t record it down. So I started this blog, mainly for consolidate the knowledge and skills, it do have much benefits:

• It’s like a resume, only better. I know of a few people who have had blog posts lead to job offers!
• Helps me learn. Organizing knowledge always helps me synthesize my own ideas. One of the tests of whether you understand something is whether you can explain it to someone else. A blog post is a great way to do that.
• Saves time. Any time you answer a question multiple times through email, you should turn it into a blog post, which makes it easier for you to share the next time someone asks.

You can find me at:

• LinkedIn
• GitHub

Posts

• Some note of Big-O Notation

  Some Algorithm basic that Data Scientist easy to skip.

  Oct 6, 2020

• F1 Score vs ROC AUC vs Accuracy vs PR AUC, Which Evaluation Metric Should you Choose?

  F1 Score vs ROC AUC vs Accuracy vs PR AUC

  Oct 5, 2020

• About Feature Scaling and Normalization

  The effect of standardization for machine learning algorithms.

  Sep 19, 2020

• Tail Problem and Double-Ended Queue

  Can you constrain your function's memory utilization for any iterable?

  Sep 17, 2020

• Pythonic Exercise Part 1

  Make your code more Pythonic, elegent.

  Sep 6, 2020

• Bayesian Optimazation Classification and Regression

  From now, stop using GridSearch and RandomSearch

  Jul 20, 2020

• Data Science Project imporvement, using LightGBM to gain more accuracy and no need to One-Hot Encoding

  Using LightGBM native categorical feature support for Adult Dataset

  Apr 15, 2020

• End-to-End Data Science Project with Adult Income Dataset

  From understand the problem, to deliver the solution.

  Mar 24, 2020

• What does AUC stand for and what is it?

  A note to clarify the defination

  Mar 23, 2020

• The Git branches developing standard you should know

  Some example of Git branch develop standard coder should follow

  Mar 12, 2020

• The map(), filter(), reduce(), zip() and Lambda() funcion in Python

  Some straightforward example to explain the function's glegance

  Mar 6, 2020

• Using Scikit-Learn Neural Network Class to classify MNIST

  Not everytime need to use Deep Learning Library.

  Mar 2, 2020

• Cost-Sensitive Decision Trees for Imbalanced Classification

  A tutorial of Imbalanced Classification on Decision Tree.

  Feb 26, 2020

• 

  Fastpages Notebook Blog Post

  A tutorial of fastpages for Jupyter notebooks.

  Feb 20, 2020

• Machine Learning Mathematical Foundation

  Footnote of Math for Machine Learning.

  Jan 23, 2020