(Note) Contents in bold are included in
Coursera Machine Learning lectures.
A few topics are not identified---regularized regression, neural networks, and anomaly detection.
- Feature extraction and transformation
- Basic statistics: summary statistics, correlations, hypothesis testing
- Anomaly detection: k-NN (k-Nearest Neighbors)
- Neural networks: perceptron, convolutional neural network
- Optimization: stochastic gradient descent,
limited-memory BFGS (L-BFGS, Broyden–Fletcher–Goldfarb–Shanno)
Figure: machine learning algorithm maps: (A) scikit-learn; (B) dlib.
Learning problems can be roughly categorized as either supervised or unsupervised.
Supervised learning builds a statistical model to
predict or estimate an output (label) based on some inputs (features):
classification if label is categorical, regression if label is quantitative.
Unsupervised learning describes the relationships and structure among a set of inputs:
dimensionality reduction, clustering.
Other areas of machine learning:
Reinforcement learning is concerned with maximizing the reward of a given agent
(person, business, etc).
- Linear classifiers:
- Generative model: linear discriminant analysis (LDA), naive Bayes classifier;
- Discriminative model: Logistic regression (logit), support vector machines (SVM), perceptron;
- Isotonic regression;
- k-means clustering;
- hierarchical clustering (dendrogram);
- Gaussian mixture;
- power iteration clustering (PIC);
- latent Dirichlet allocation (LDA);
Standardization is required in case of different units.
- Principal component analysis (PCA):
find the (orthogonal) directions in a Euclidean space
that successively explain the most sample variance (minimize the residual sum of squares);
- Singular value decomposition (SVD);
JVM (Java, Scala):
H2O: generalized linear models, gradient boosting machine
(also supports random forest), generalized lower rank models, deep neural network;
- Spark: MLlib (not nearly as good);
e1071 (interface to libsvm),
Benchmark for GLM, RF, GBM:
For the algorithms it supports,
H2O is the fastest and as accurate on data over 10M records that fit in memory of a single machine.
Benchmark for GBM
🏷 Category=Computation Category=Machine Learning