Choosing the Right Machine Learning Algorithm

๐ŸŽฏ

Understand the Problem Type

๐Ÿ“Š Classification
๐Ÿ“ˆ Regression
๐Ÿ” Clustering
๐Ÿ“‰ Dimensionality Reduction
๐Ÿ” Assess Interpretability vs. Performance
  • High Interpretability: Healthcare, Finance, Legal
  • High Performance: Image Recognition, NLP, Gaming
โžก๏ธ
๐Ÿ’พ

Assess Data Size & Quality

๐Ÿ“‹ Small Dataset (< 10K samples) Simpler models work better
โ€ข Linear/Logistic Regression
โ€ข Decision Trees
โ€ข SVM
โ€ข K-Nearest Neighbors
๐Ÿ—ƒ๏ธ Large Dataset (> 100K samples) Complex models can excel
โ€ข Neural Networks
โ€ข Deep Learning
โ€ข Ensemble Methods
โ€ข Gradient Boosting
โšก Performance Priority
โ€ข Random Forest
โ€ข Gradient Boosting
โ€ข Deep Learning
โ€ข XGBoost
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โš™๏ธ

Check Computational Resources

๐Ÿ’ป Low Resources
  • Linear/Logistic Regression
  • Naive Bayes
  • K-Means Clustering
  • Decision Trees
๐Ÿ–ฅ๏ธ Medium Resources
  • Random Forest
  • SVM
  • K-Nearest Neighbors
  • Gradient Boosting
โšก High Resources
  • Deep Neural Networks
  • Convolutional Neural Networks
  • Large Ensemble Methods
  • Transformer Models
โžก๏ธ
๐Ÿงช

Experiment with Multiple Algorithms

๐Ÿ”„ Try Several Approaches
  • Decision Trees
  • Support Vector Machines
  • Logistic Regression
  • Random Forest
  • Gradient Boosting
โœ… Use Cross-Validation
  • K-Fold Cross-Validation
  • Stratified Sampling
  • Hold-out Validation
  • Performance Metrics Comparison

๐ŸŽฏ Consider Ensemble Methods

Random Forest
Boosting
Stacking
Bagging
Voting
Blending

Combine multiple models for improved accuracy and robustness

๐Ÿ’ก Pro Tips for Algorithm Selection

Start Simple: Begin with baseline models (Linear Regression, Logistic Regression) before trying complex algorithms.
Feature Engineering: Good features often matter more than complex algorithms. Clean and engineer your data first.
Domain Knowledge: Consider domain-specific constraints (regulatory requirements, real-time predictions, etc.).
Evaluation Metrics: Choose the right metrics for your problem (Accuracy, Precision, Recall, F1, AUC, RMSE, etc.).

ยฉ 2025 Machine Learning for Health Research Course | Prof. Gennady Roshchupkin

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