Ruby on Rails


10 Ruby Gems for Machine Learning

Machine learning has gained tremendous popularity in recent years, and for good reason. It allows us to create intelligent systems that can make predictions, classify data, and even generate creative content. While Python is often the language of choice for machine learning, Ruby enthusiasts need not feel left out. In this blog, we’ll introduce you to 10 Ruby Gems that can empower your machine learning endeavors. These Gems cover various aspects of the machine learning pipeline, from data preprocessing to model evaluation. Whether you’re a seasoned Rubyist or a newcomer to the language, these Gems will help you get started with machine learning in Ruby.

10 Ruby Gems for Machine Learning

1. Daru

Data Handling Made Easy

Before you dive into the world of machine learning, you’ll need to handle and preprocess your data efficiently. Daru is a Ruby library that simplifies the process of working with structured data. It provides powerful data manipulation capabilities similar to pandas in Python. With Daru, you can load, transform, and analyze your data effortlessly.


You can install Daru using RubyGems:

gem install daru

Example Usage

require 'daru'

# Create a DataFrame
df ={
  'Age' => [25, 30, 35, 40, 45],
  'Income' => [50000, 60000, 75000, 80000, 90000]

# Perform operations on the DataFrame
mean_age = df['Age'].mean
max_income = df['Income'].max

puts "Mean Age: #{mean_age}"
puts "Max Income: #{max_income}"

Daru’s intuitive API makes it a valuable tool for data exploration and manipulation, essential for any machine learning project.

2. SciRuby

Scientific Computing with Ruby

SciRuby is a comprehensive ecosystem of scientific and numerical libraries for Ruby. It includes tools for linear algebra, statistics, optimization, and more. While not exclusively for machine learning, SciRuby provides the foundational building blocks that are essential for developing machine learning algorithms.


You can install SciRuby using RubyGems:

gem install sciruby

Example Usage

require 'sciruby'

# Create a matrix
matrix =, 3).seq

# Perform matrix operations
inverse_matrix = matrix.inv

puts "Inverse Matrix:\n#{inverse_matrix}"

By leveraging SciRuby, you can perform advanced numerical computations and build custom machine learning algorithms in Ruby.

3. Numo-NArray

Numerical Computing in Ruby

Numo-NArray is another essential Gem for numerical computing in Ruby. It provides a powerful N-dimensional array class that is efficient and easy to use. This Gem is particularly handy when you need to work with multi-dimensional data, which is common in machine learning.


You can install Numo-NArray using RubyGems:

gem install numo-narray

Example Usage

require 'numo/narray'

# Create a 2D array
array = Numo::DFloat[[1, 2, 3], [4, 5, 6], [7, 8, 9]]

# Perform array operations
sum = array.sum
mean = array.mean

puts "Sum: #{sum}"
puts "Mean: #{mean}"

Numo-NArray’s efficient numerical operations make it an indispensable tool for implementing machine learning algorithms.

4. Rblearn

Machine Learning in Ruby

Rblearn is a Ruby library that provides machine learning algorithms for classification and regression tasks. It is built on top of Liblinear and Libsvm, two popular C libraries for machine learning. Rblearn offers a simple and convenient API for training and using these algorithms in your Ruby projects.


You can install Rblearn using RubyGems:

gem install rblearn

Example Usage

require 'rblearn'

# Create a dataset
X = [[1, 2], [2, 3], [3, 4], [4, 5]]
y = [0, 1, 0, 1]

# Create a model and train it
model =
model.train(X, y)

# Make predictions
predictions = model.predict([[5, 6], [6, 7]])

puts "Predictions: #{predictions}"

Rblearn simplifies the process of incorporating machine learning into your Ruby applications, making it accessible even for those with limited machine learning experience.

5. Rubystats

Statistical Analysis with Ruby

Rubystats is a Gem that provides a wide range of statistical functions and distributions for Ruby. While not specifically designed for machine learning, it can be incredibly useful when you need to perform statistical analysis on your data, a crucial step in the machine learning pipeline.


You can install Rubystats using RubyGems:

gem install rubystats

Example Usage

require 'rubystats'

# Generate a random sample from a normal distribution
normal_dist =, 1)
sample = normal_dist.rng(10)

# Calculate the mean and standard deviation
mean = Rubystats.mean(sample)
std_dev = Rubystats.stddev(sample)

puts "Mean: #{mean}"
puts "Standard Deviation: #{std_dev}"

Rubystats allows you to perform various statistical analyses, helping you gain insights into your data before building machine learning models.

6. NMatrix

Advanced Linear Algebra

NMatrix is a Ruby library that provides a high-performance N-dimensional array class, specifically designed for scientific and numerical computing. It is a powerful tool for handling large datasets and performing complex linear algebra operations efficiently.


You can install NMatrix using RubyGems:

gem install nmatrix

Example Usage

require 'nmatrix'

# Create a 2D matrix
matrix =[3, 3], [1, 2, 3, 4, 5, 6, 7, 8, 9])

# Perform matrix multiplication
result =

puts "Matrix Multiplication:\n#{result}"

NMatrix’s high-performance capabilities make it an excellent choice for machine learning tasks that involve large datasets and complex mathematical operations.

7. Kramati

Data Preprocessing Made Easy

Kramati is a Ruby Gem designed to simplify data preprocessing tasks. In machine learning, data preprocessing is a critical step that involves cleaning, transforming, and scaling your data. Kramati provides a convenient API to perform these tasks efficiently.


You can install Kramati using RubyGems:

gem install kramati

Example Usage

require 'kramati'

# Create a data preprocessing pipeline
pipeline = do
  add 'mean')

# Fit and transform the data
preprocessed_data = pipeline.fit_transform(X)

puts "Preprocessed Data:\n#{preprocessed_data}"

Kramati simplifies the often cumbersome process of data preprocessing, allowing you to focus on building and training machine learning models.

8. Ai4r

Ruby AI Library

Ai4r (Artificial Intelligence for Ruby) is a library that provides a wide range of machine learning algorithms, including decision trees, neural networks, and genetic algorithms. It offers an easy-to-use interface for creating and training these algorithms for various tasks.


You can install Ai4r using RubyGems:

gem install ai4r

Example Usage

require 'ai4r'

# Create a decision tree classifier
tree =, y)

# Make predictions
predictions = tree.eval([5, 6])

puts "Predictions: #{predictions}"

Ai4r is a versatile Gem that allows you to experiment with different machine learning algorithms in Ruby.


Machine Learning with Gradient Boosting

MLBG is a Ruby Gem that provides an implementation of gradient boosting, a powerful ensemble learning technique. Gradient boosting can be used for both regression and classification tasks. MLBG offers an easy-to-use API for training gradient boosting models in Ruby.


You can install MLBG using RubyGems:

gem install mlbg

Example Usage

require 'mlbg'

# Create a gradient boosting classifier
clf =, y)

# Make predictions
predictions = clf.predict([[5, 6], [6, 7]])

puts "Predictions: #{predictions}"

MLBG is a valuable Gem for those looking to harness the power of gradient boosting in their machine learning projects.

10. Mlperf

Machine Learning Benchmarking

Mlperf is a Ruby Gem designed for benchmarking machine learning models. It allows you to evaluate the performance of your machine learning algorithms and compare them with industry-standard benchmarks. This Gem is essential for ensuring that your models meet the required quality and efficiency standards.


You can install Mlperf using RubyGems:

gem install mlperf

Example Usage

require 'mlperf'

# Create a benchmark for your machine learning model
benchmark =

# Evaluate the model's performance
accuracy = benchmark.evaluate(model, test_data)

puts "Model Accuracy: #{accuracy}"

Mlperf simplifies the process of benchmarking your machine learning models, helping you ensure they meet the highest standards of quality and efficiency.


Ruby might not be the first language that comes to mind when you think about machine learning, but these 10 Ruby Gems prove that it has a lot to offer in this field. Whether you’re handling data, implementing custom algorithms, or building predictive models, these Gems provide the tools you need to excel in machine learning with Ruby. So, go ahead and explore the world of machine learning in Ruby, and see how these Gems can empower your projects. Happy coding!

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Senior Software Engineer with a focus on remote work. Proficient in Ruby on Rails. Expertise spans y6ears in Ruby on Rails development, contributing to B2C financial solutions and data engineering.