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Added the ability to turn off style weight normalization in order to … #265

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Added the ability to turn off style weight normalization in order to … #265

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19 changes: 11 additions & 8 deletions neural_style.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,6 @@ require 'torch'
require 'nn'
require 'image'
require 'optim'

require 'loadcaffe'


Expand All @@ -12,6 +11,7 @@ local cmd = torch.CmdLine()
cmd:option('-style_image', 'examples/inputs/seated-nude.jpg',
'Style target image')
cmd:option('-style_blend_weights', 'nil')
cmd:option('-use_raw_blend_weights', false, 'turns off normalization of multiple blend weights; set to false if using negative weights to avoid style blowout')
cmd:option('-content_image', 'examples/inputs/tubingen.jpg',
'Content target image')
cmd:option('-image_size', 512, 'Maximum height / width of generated image')
Expand Down Expand Up @@ -106,14 +106,17 @@ local function main(params)
assert(#style_blend_weights == #style_image_list,
'-style_blend_weights and -style_images must have the same number of elements')
end

-- Normalize the style blending weights so they sum to 1
local style_blend_sum = 0
for i = 1, #style_blend_weights do
style_blend_weights[i] = tonumber(style_blend_weights[i])
style_blend_sum = style_blend_sum + style_blend_weights[i]
end
for i = 1, #style_blend_weights do
style_blend_weights[i] = style_blend_weights[i] / style_blend_sum
if not params.use_raw_blend_weights then
local style_blend_sum = 0
for i = 1, #style_blend_weights do
style_blend_weights[i] = tonumber(style_blend_weights[i])
style_blend_sum = style_blend_sum + style_blend_weights[i]
end
for i = 1, #style_blend_weights do
style_blend_weights[i] = style_blend_weights[i] / style_blend_sum
end
end


Expand Down