class DNN::Layers::MaxPool2D
Public Instance Methods
backward_node(dy)
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# File lib/dnn/core/layers/cnn_layers.rb, line 389 def backward_node(dy) dmax = Xumo::SFloat.zeros(dy.size * @pool_size.reduce(:*)) dmax[@max_index.flatten] = dy.flatten dcol = dmax.reshape(dy.shape[0..2].reduce(:*), @pool_size.reduce(:*) * dy.shape[3]) dx = col2im(dcol, @x_shape, *@out_size, *@pool_size, @strides) @padding ? zero_padding_bwd(dx, @pad_size) : dx end
forward_node(x)
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# File lib/dnn/core/layers/cnn_layers.rb, line 380 def forward_node(x) x = zero_padding(x, @pad_size) if @padding @x_shape = x.shape col = im2col(x, *@out_size, *@pool_size, @strides) col = col.reshape(x.shape[0] * @out_size.reduce(:*), @pool_size.reduce(:*), x.shape[3]) @max_index = col.max_index(1) col.max(1).reshape(x.shape[0], *@out_size, x.shape[3]) end