Jodie Heqi QiuSQL: The key thing to understandI found that the order SQL processes commands is crucial to understanding SQL, especially for beginners.1 min read·Oct 30, 2020----
Jodie Heqi QiuMy Understandings of PCAPlease note this is not a comprehensive article of PCA. I’m just sharing some key thoughts on PCA that might be helpful to others who are…2 min read·Apr 19, 2020----
Jodie Heqi QiuMy Understandings of Neural Networks: a Mathematical PerspectiveThe first time I learned about neural networks was November 2019 when taking the famous machine learning course by Andrew Ng. I had a…2 min read·Apr 12, 2020----
Jodie Heqi QiuMy Understandings: Why Use Log Scale to Plot Ratio VI would like to mark down the reasons that I found helpful for intuitive understandings.2 min read·Apr 10, 2020----
Jodie Heqi QiuMy Understandings of Degree of FreedomA good example to intuitively understand the concept:1 min read·Apr 9, 2020----
Jodie Heqi QiuMy Understandings of T-Test & T-DistributionI came across t-test when I was doing data analysis of my master thesis, in which I compared follower’s favor levels towards social media…2 min read·Apr 8, 2020----
Jodie Heqi QiuMy understandings of Data pre-processingWhen pre-processing training data and test data, does it make a difference to pre-process before splitting or to split before…3 min read·Apr 5, 2020----
Jodie Heqi QiuMy Understanding: Memos on XgboostI was very confused by Xgboost. After reading the original research paper I have finally come to understand the fundamentals. I also did…2 min read·Mar 30, 2020----
Jodie Heqi QiuInstalling Xgboost on MacOSI’ve tried many ways to pip install but kept running into the following error:1 min read·Mar 21, 2020----
Jodie Heqi QiuCoursera Machine Learning: Unzipping Problem&FixIn week 2, after I downloaded the exercise zip file “machine-learning-ex”, I found that I could not unzip it in Mathlab online.1 min read·Dec 18, 2019----
