Npy

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

:fire: Uses Numo::NArray 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

arr = Numo::Int32[0...10]
Npy.save("x.npy", arr)

Load an npy file

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

Load an npy string

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

npz

npz files contain multiple arrays

Save multiple arrays

x =  Numo::Int32[0...10]
y = x * 2
Npy.save_npz("mnist.npz", x: x, y: y)

Load an npz file

arrs = Npy.load_npz("mnist.npz")

Get keys

arrs.keys

Get an array

arrs["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