Npy

Save and load NumPy npy and npz files in Ruby - no Python required

:fire: Uses Numo for blazing performance

Installation

Add this line to your application’s Gemfile:

gem "npy"

Getting Started

npy

npy files contain a single array

Save an array

x = Numo::Int32[0..9]
Npy.save("x.npy", x)

Load an npy file

x = Npy.load("x.npy")

Load an npy string

byte_str = File.binread("x.npy")
x = Npy.load_string(byte_str)

npz

npz files contain multiple arrays

Save multiple arrays

x =  Numo::Int32[0..9]
y = x * 2
Npy.save_npz("data.npz", x: x, y: y)

Load an npz file

data = Npy.load_npz("data.npz")

Get keys

data.keys

Get an array

data["x"]

Arrays are lazy loaded for performance

Resources

• npy format
• NumPy data types
• Numo::NArray docs

History

View the changelog

Contributing

Everyone is encouraged to help improve this project. Here are a few ways you can help:

• Report bugs
• Fix bugs and submit pull requests
• Write, clarify, or fix documentation
• Suggest or add new features

To get started with development:

git clone https://github.com/ankane/npy.git
cd npy
bundle install
bundle exec rake test