hoge.rb

require 'datasets-gdk-pixbuf'
require 'gtk3'

n = ARGV[0].to_i

w = Gtk::Window.new
w.set_size_request(600,600)
flowbox = Gtk::FlowBox.new 
flowbox.valign = :start
flowbox.selection_mode = :none

cifar = Datasets::CIFAR.new
cifar.each.with_index do |record, i|
  if i < n
    pixbuf = record.to_gdk_pixbuf
    img = Gtk::Image.new(pixbuf: pixbuf)
    button = Gtk::Button.new
    button.image = img
    flowbox.add button
  end
end

w.add flowbox
w.show_all
Gtk.main