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DATA MINING

For a reproducible preview → Open In Colab

  • Data mining is an interdisciplinary (intersection of machine learning, statistics, and database systems) field of knowledge.
  • Many people treat data mining as a synonym for knowledge discovery from data, or KDD, while others view data mining as merely an essential step in the process of KDD where intelligent methods are applied to extract data patterns.
  • As in industries and in the academic environment the term data mining is often used to refer to the entire knowledge discovery process we’ll adopt this broader view of data mining.

Dataset:

→ The unlabeled data is a subset of publicly available (from https://www.meteoblue.com/) data about climate in Basel, Switzerland, which contains 1763 records of data (for 18 features) from the summer and the winter seasons from 2010 to 2019 period and can be found here

→ The meaning of each column of data is listed in the notebook.

Tasks:

→ PRE-PROCESSSING

  • EDA
    • Descriptive statistics
    • Check if there is any null data
    • Histograms of all features and correlation between all features
  • Feature Selection (considering the conclusions drawn from EDA)
  • Standardize
  • Detect and Remove Global Outliers (if < -3 or >3)
  • Normalize (to convert to [0, 1])
  • Feature Extraction with PCA (extraction of new, orthogonal - independent - features, which are a linear combination of the original ones)
  • PCA Features Contribution to Cumulative Explained Variance

→ CLUSTERING

  • Silhouette Analysis (for finding the optimal number of clusters)
  • Clustering with K-Means and Gaussian Mixture Algorithms
  • Choose between K-Means and Gaussian Mixture to Predict the Labels

→ CLASSIFICATION

  • Classification with K-NN and SVM, using Hyperparameter Tuning with GridSeachCV
  • Classification Report

Achievements:

  • Two distinct groups of data points - clusters - were clearly identified within the dataset (summer and winter days).
  • Using the resulting cluster labels we trained 2 classifiers using hyperparameter tuning with GridSeachCV which allowed us to reach very high values for all considered metrics.