蟲匯聚之所

Data processing

Aggregation(合併)

譬如體重和身高

合併為BMI

Sampling

Simple random sampling 隨機取樣

Sampling without replacement 取樣後不補回

Sampling with replacement 取樣後補回

Stratified sampling 資料分堆(partition)後各別取樣並merge

Dimensionality Reduction

資料屬性變高的時候

PCA(python library)

redundant features

Irrelevant features

tec:

brute force

embedding

filter

wrapper

Feature Engineering

Feature subset seletion

Feature creation

Discretization and binarization

feature extraction

mapping data to new space

feature construction

Attribute transformation

正規化標準化

正規化好像比較有意義

標準化將資料轉常態分佈

相似度

相似性、相異性

Euclidean Distance