Machine Learning From Scratch

About

Python implementations of some of the fundamental Machine Learning models and algorithms from scratch.

The purpose of this project is not to produce as optimized and computationally efficient algorithms as possible but rather to present the inner workings of them in a transparent way.

Table of Contents

• Machine Learning From Scratch
  • About
  • Table of Contents
  • Installation
  • Example Usage
    • Regression
    • Classification
    • Clustering
    • Generating Handwritten Digits
    • Deep Reinforcement Learning
    • Genetic Algorithm
    • Association Analysis
  • Implementations
    • Supervised Learning
    • Unsupervised Learning
    • Reinforcement Learning
  • Contact

Installation

$ git clone https://github.com/eriklindernoren/ML-From-Scratch
$ cd ML-From-Scratch
$ python setup.py install

Example Usage

Regression

$ python mlfromscratch/supervised_learning/regression.py

Figure: Polynomial ridge regression of temperature data measured in
Linköping, Sweden 2016.

Classification

$ python mlfromscratch/supervised_learning/neural_network.py

+---------+
| ConvNet |
+---------+
Input Shape: (1, 8, 8)
+----------------------+------------+--------------+
| Layer Type           | Parameters | Output Shape |
+----------------------+------------+--------------+
| Conv2D               | 160        | (16, 8, 8)   |
| Activation (ReLU)    | 0          | (16, 8, 8)   |
| Dropout              | 0          | (16, 8, 8)   |
| BatchNormalization   | 2048       | (16, 8, 8)   |
| Conv2D               | 4640       | (32, 8, 8)   |
| Activation (ReLU)    | 0          | (32, 8, 8)   |
| Dropout              | 0          | (32, 8, 8)   |
| BatchNormalization   | 4096       | (32, 8, 8)   |
| Flatten              | 0          | (2048,)      |
| Dense                | 524544     | (256,)       |
| Activation (ReLU)    | 0          | (256,)       |
| Dropout              | 0          | (256,)       |
| BatchNormalization   | 512        | (256,)       |
| Dense                | 2570       | (10,)        |
| Activation (Softmax) | 0          | (10,)        |
+----------------------+------------+--------------+
Total Parameters: 538570

Training: 100% [------------------------------------------------------------------------] Time: 0:01:55
Accuracy: 0.987465181058

Figure: Classification of the digit dataset using CNN.

Clustering

$ python mlfromscratch/unsupervised_learning/dbscan.py

Figure: Clustering of the moons dataset using DBSCAN.

Generating Handwritten Digits

$ python mlfromscratch/unsupervised_learning/generative_adversarial_network.py

+-----------+
| Generator |
+-----------+
Input Shape: (100,)
+------------------------+------------+--------------+
| Layer Type             | Parameters | Output Shape |
+------------------------+------------+--------------+
| Dense                  | 25856      | (256,)       |
| Activation (LeakyReLU) | 0          | (256,)       |
| BatchNormalization     | 512        | (256,)       |
| Dense                  | 131584     | (512,)       |
| Activation (LeakyReLU) | 0          | (512,)       |
| BatchNormalization     | 1024       | (512,)       |
| Dense                  | 525312     | (1024,)      |
| Activation (LeakyReLU) | 0          | (1024,)      |
| BatchNormalization     | 2048       | (1024,)      |
| Dense                  | 803600     | (784,)       |
| Activation (TanH)      | 0          | (784,)       |
+------------------------+------------+--------------+
Total Parameters: 1489936

+---------------+
| Discriminator |
+---------------+
Input Shape: (784,)
+------------------------+------------+--------------+
| Layer Type             | Parameters | Output Shape |
+------------------------+------------+--------------+
| Dense                  | 401920     | (512,)       |
| Activation (LeakyReLU) | 0          | (512,)       |
| Dropout                | 0          | (512,)       |
| Dense                  | 131328     | (256,)       |
| Activation (LeakyReLU) | 0          | (256,)       |
| Dropout                | 0          | (256,)       |
| Dense                  | 514        | (2,)         |
| Activation (Softmax)   | 0          | (2,)         |
+------------------------+------------+--------------+
Total Parameters: 533762

Figure: Training progress of a MNIST Generative Adversarial Network.

Deep Reinforcement Learning

$ python mlfromscratch/reinforcement_learning/deep_q_network.py

+----------------+
| Deep Q-Network |
+----------------+
Input Shape: (4,)
+-------------------+------------+--------------+
| Layer Type        | Parameters | Output Shape |
+-------------------+------------+--------------+
| Dense             | 320        | (64,)        |
| Activation (ReLU) | 0          | (64,)        |
| Dense             | 130        | (2,)         |
+-------------------+------------+--------------+
Total Parameters: 450

Figure: Deep Q-Network solution to the CartPole-v1 environment in OpenAI gym.

Genetic Algorithm

$ python mlfromscratch/unsupervised_learning/genetic_algorithm.py

+--------+
|   GA   |
+--------+
Description: Implementation of a Genetic Algorithm which aims to produce
the user specified target string. This implementation calculates each
candidate's fitness based on the alphabetical distance between the candidate
and the target. A candidate is selected as a parent with probabilities proportional
to the candidate's fitness. Reproduction is implemented as a single-point
crossover between pairs of parents. Mutation is done by randomly assigning
new characters with uniform probability.

Parameters
----------
Target String: 'Genetic Algorithm'
Population Size: 100
Mutation Rate: 0.05

[0 Closest Candidate: 'CJqlJguPlqzvpoJmb', Fitness: 0.00]
[1 Closest Candidate: 'MCxZxdr nlfiwwGEk', Fitness: 0.01]
[2 Closest Candidate: 'MCxZxdm nlfiwwGcx', Fitness: 0.01]
[3 Closest Candidate: 'SmdsAklMHn kBIwKn', Fitness: 0.01]
[4 Closest Candidate: '  lotneaJOasWfu Z', Fitness: 0.01]
...
[292 Closest Candidate: 'GeneticaAlgorithm', Fitness: 1.00]
[293 Closest Candidate: 'GeneticaAlgorithm', Fitness: 1.00]
[294 Answer: 'Genetic Algorithm']

Association Analysis

$ python mlfromscratch/unsupervised_learning/apriori.py 
+-------------+
|   Apriori   |
+-------------+
Minimum Support: 0.25
Minimum Confidence: 0.8
Transactions:
    [1, 2, 3, 4]
    [1, 2, 4]
    [1, 2]
    [2, 3, 4]
    [2, 3]
    [3, 4]
    [2, 4]
Frequent Itemsets:
    [1, 2, 3, 4, [1, 2], [1, 4], [2, 3], [2, 4], [3, 4], [1, 2, 4], [2, 3, 4]]
Rules:
    1 -> 2 (support: 0.43, confidence: 1.0)
    4 -> 2 (support: 0.57, confidence: 0.8)
    [1, 4] -> 2 (support: 0.29, confidence: 1.0)

Implementations

Supervised Learning

• Adaboost
• Bayesian Regression
• Decision Tree
• Deep Learning
  • Layers
    • Activation Layer
    • Average Pooling Layer
    • Batch Normalization Layer
    • Constant Padding Layer
    • Convolutional Layer
    • Dropout Layer
    • Flatten Layer
    • Fully-Connected (Dense) Layer
    • Max Pooling Layer
    • Reshape Layer
    • Up Sampling Layer
    • Zero Padding Layer
  • Model Types
    • Convolutional Neural Network
    • Multilayer Perceptron
• Gradient Boosting
• K Nearest Neighbors
• Linear Discriminant Analysis
• Linear Regression
• Logistic Regression
• Multi-class Linear Discriminant Analysis
• Naive Bayes
• Perceptron
• Polynomial Regression
• Random Forest
• Ridge Regression
• Support Vector Machine
• XGBoost

Unsupervised Learning

• Apriori
• DBSCAN
• FP-Growth
• Gaussian Mixture Model
• Generative Adversarial Network
• Genetic Algorithm
• K-Means
• Partitioning Around Medoids
• Principal Component Analysis

Reinforcement Learning

• Deep Q-Network

Contact

If there's some implementation you would like to see here or if you're just feeling social, feel free to email me or connect with me on LinkedIn.

eriklindernoren@gmail.com
LinkedIn