class DNN::Layers::UnPool2D

Attributes

unpool_size[R]

Public Class Methods

new(unpool_size) click to toggle source

@param [Array | Integer] unpool_size Unpooling size. unpooling size is of the form [height, width].

Calls superclass method DNN::Layers::Layer::new
# File lib/dnn/core/layers/cnn_layers.rb, line 442
def initialize(unpool_size)
  super()
  @unpool_size = unpool_size.is_a?(Integer) ? [unpool_size, unpool_size] : unpool_size
end

Public Instance Methods

backward_node(dy) click to toggle source
# File lib/dnn/core/layers/cnn_layers.rb, line 472
def backward_node(dy)
  in_size = @input_shape[0..1]
  col = im2col(dy, *in_size, *@unpool_size, @unpool_size)
  col = col.reshape(dy.shape[0] * in_size.reduce(:*), @unpool_size.reduce(:*), dy.shape[3])
  col.sum(1).reshape(dy.shape[0], *in_size, dy.shape[3])
end
build(input_shape) click to toggle source
Calls superclass method DNN::Layers::Layer#build
# File lib/dnn/core/layers/cnn_layers.rb, line 447
def build(input_shape)
  unless input_shape.length == 3
    raise DNNShapeError, "Input shape is #{input_shape}. But input shape must be 3 dimensional."
  end
  prev_h, prev_w = input_shape[0..1]
  unpool_h, unpool_w = @unpool_size
  out_h = prev_h * unpool_h
  out_w = prev_w * unpool_w
  @out_size = [out_h, out_w]
  @num_channel = input_shape[2]
  super
end
compute_output_shape() click to toggle source
# File lib/dnn/core/layers/cnn_layers.rb, line 479
def compute_output_shape
  [*@out_size, @num_channel]
end
forward_node(x) click to toggle source
# File lib/dnn/core/layers/cnn_layers.rb, line 460
def forward_node(x)
  @x_shape = x.shape
  unpool_h, unpool_w = @unpool_size
  x2 = Xumo::SFloat.zeros(x.shape[0], x.shape[1], unpool_h, x.shape[2], unpool_w, @num_channel)
  unpool_h.times do |i|
    unpool_w.times do |j|
      x2[true, true, i, true, j, true] = x
    end
  end
  x2.reshape(x.shape[0], *@out_size, x.shape[3])
end
load_hash(hash) click to toggle source
# File lib/dnn/core/layers/cnn_layers.rb, line 487
def load_hash(hash)
  initialize(hash[:unpool_size])
end
to_hash() click to toggle source
Calls superclass method DNN::Layers::Layer#to_hash
# File lib/dnn/core/layers/cnn_layers.rb, line 483
def to_hash
  super(unpool_size: @unpool_size)
end