Chaoran Liu

Chaoran Liu

A data science enthusiast

Recent posts

Recognize the Digits

2 minute read

This time I am going to demostrate the kaggle 101 level competition - digit recogniser. We are asked to train a model to recogize the digit from the pixel data in this competition. The data set is available here. description of the data: label: the integers from 0 - 9; features: pixel001-pixel784, which are rolled out from 28x28 digit image; pixel data is ranged from 0 -255, which indicating the brightness of the pixel in grey scale; Visualize the digit: Let’s randomly look at 100 dig...

Spatial Visualization with ggmap R package

3 minute read

ggmap, which is an R package built to visualize with map, is very similar to ggplot2. And its output is ‘ggplot’ class, which means it also support layered visualization just like ggplot2. I will demonstrate with two examples “Crimes in San Fransisco” and “Taxi in Porto”. The data of both examples are taken from kaggle. some basics of ggmap: get_map: is the function to download map from source (e.g. google/openstreetmap). some parameters can play with: location: the longitude and the...

Tree based models in R on Titanic Data

5 minute read

This is the first time I blog my journey of learning data science, which starts from the first kaggle competition I attempted - the Titanic. In this competition, we are asked to predict the survival of passengers onboard, with some information given, such as age, gender, ticket fare… Translated letter reveals first hand account of the “unforgettable scenes where horror mixed with sublime heroism” as the Titanic sank Photo: Getty Images How bad is this tragedy? Let’s take some exploratory d...