X-Git-Url: https://fleuret.org/cgi-bin/gitweb/gitweb.cgi?a=blobdiff_plain;f=test-dagnn.lua;h=5b266da3ea9e03a6b837f63022ee65b9eecc4198;hb=e6516772e13dd5424f0a1b7e2063a7417614844c;hp=a45d6365d61a6183b7b1b49758cddb89272d7708;hpb=682b76200f755f5f16477e086056a86cafdea1cd;p=dagnn.git

diff --git a/test-dagnn.lua b/test-dagnn.lua
index a45d636..5b266da 100755
--- a/test-dagnn.lua
+++ b/test-dagnn.lua
@@ -1,56 +1,142 @@
 #!/usr/bin/env luajit
 
+--[[
+
+   Copyright (c) 2016 Idiap Research Institute, http://www.idiap.ch/
+   Written by Francois Fleuret <francois.fleuret@idiap.ch>
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License version 3 as
+   published by the Free Software Foundation.
+
+   It is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this file.  If not, see <http://www.gnu.org/licenses/>.
+
+]]--
+
 require 'torch'
 require 'nn'
 
 require 'dagnn'
 
+function checkGrad(model, criterion, input, target)
+   local params, gradParams = model:getParameters()
+
+   local epsilon = 1e-5
+
+   local output = model:forward(input)
+   local loss = criterion:forward(output, target)
+   local gradOutput = criterion:backward(output, target)
+   gradParams:zero()
+   model:backward(input, gradOutput)
+   local analyticalGradParam = gradParams:clone()
+
+   for i = 1, params:size(1) do
+      local x = params[i]
+
+      params[i] = x - epsilon
+      local output0 = model:forward(input)
+      local loss0 = criterion:forward(output0, target)
+
+      params[i] = x + epsilon
+      local output1 = model:forward(input)
+      local loss1 = criterion:forward(output1, target)
+
+      params[i] = x
+
+      local ana = analyticalGradParam[i]
+      local num = (loss1 - loss0) / (2 * epsilon)
+      local err
+
+      if num == ana then
+         err = 0
+      else
+         err = torch.abs(num - ana) / torch.abs(num)
+      end
+
+      print(
+         'CHECK '
+            .. err
+            .. ' checkGrad ' .. i
+            .. ' analytical ' .. ana
+            .. ' numerical ' .. num
+      )
+   end
+
+end
+
+function printTensorTable(t)
+   if torch.type(t) == 'table' then
+      for i, t in pairs(t) do
+         print('-- ELEMENT [' .. i .. '] --')
+         printTensorTable(t)
+      end
+   else
+      print(tostring(t))
+   end
+end
+
 -- torch.setnumthreads(params.nbThreads)
 torch.setdefaulttensortype('torch.DoubleTensor')
 torch.manualSeed(2)
 
+--                     +--> c ----> e --+
+--                    /            /     \
+--                   /            /       \
+--  input --> a --> b ---> d ----+         g --> output
+--                          \             /
+--                           \           /
+--                            +--> f ---+
+
 a = nn.Linear(10, 10)
 b = nn.ReLU()
 c = nn.Linear(10, 3)
 d = nn.Linear(10, 3)
 e = nn.CMulTable()
-f = nn.Linear(3, 2)
+f = nn.Linear(3, 3)
+g = nn.CAddTable()
 
---[[
+model = nn.DAG()
 
-   a -----> b ---> c ----> e ---
-             \           /
-              \--> d ---/
-                    \
-                     \---> f ---
-]]--
+model:addEdge(a, b)
+model:addEdge(b, c)
+model:addEdge(b, d)
+model:addEdge(c, e)
+model:addEdge(d, e)
+model:addEdge(d, f)
+model:addEdge(e, g)
+model:addEdge(f, g)
 
-g = nn.DAG:new()
+model:setInput(a)
+model:setOutput(g)
 
-g:setInput(a)
-g:setOutput({ e })
+input = torch.Tensor(3, 10):uniform()
 
-g:addEdge(c, e)
-g:addEdge(a, b)
-g:addEdge(d, e)
-g:addEdge(b, c)
-g:addEdge(b, d)
--- g:addEdge(d, f)
+print('******************************************************************')
+print('** updateOutput **************************************************')
+print('******************************************************************')
 
--- g = torch.load('dag.t7')
+output = model:updateOutput(input):clone()
 
-g:print()
+printTensorTable(output)
 
-input = torch.Tensor(3, 10):uniform()
+print('******************************************************************')
+print('** updateGradInput ***********************************************')
+print('******************************************************************')
 
-output = g:updateOutput(input)
+gradInput = model:updateGradInput(input, output)
 
-if torch.type(output) == 'table' then
-   for i, t in pairs(output) do
-      print(tostring(i) .. ' -> ' .. tostring(t))
-   end
-else
-   print(tostring(output))
-end
+printTensorTable(gradInput)
+
+print('******************************************************************')
+print('** checkGrad *****************************************************')
+print('******************************************************************')
+
+output:uniform()
 
-torch.save('dag.t7', g)
+checkGrad(model, nn.MSECriterion(), input, output)