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-- This is code common to container modules, which are collections of
-- smaller constituent modules like Parallel, Sequential, etc.
local Container, parent = torch.class('nn.Container', 'nn.Module')
function Container:__init(...)
parent.__init(self, ...)
self.modules = {}
end
function Container:add(module)
table.insert(self.modules, module)
return self
end
function Container:get(index)
return self.modules[index]
end
function Container:size()
return #self.modules
end
-- Check if passing arguments through xpcall is supported in this Lua interpreter.
local _, XPCALL_ARGS = xpcall(function(x) return x ~= nil end, function() end, 1)
local TRACEBACK_WARNING = "WARNING: If you see a stack trace below, it doesn't point to the place where this error occurred. Please use only the one above."
-- module argument can be retrieved with moduleIndex, but code is cleaner when
-- it has to be specified anyway.
function Container:rethrowErrors(module, moduleIndex, funcName, ...)
assert(module == self.modules[moduleIndex],
"mismatch between moduleIndex and self.modules in rethrowErrors")
local function handleError(err)
-- This will be executed only in the first container that handles the error.
if not err:find(TRACEBACK_WARNING) then
local traceback = debug.traceback()
-- Remove this handler from the stack
local _, first_line_end = traceback:find('^.-\n')
local _, second_line_end = traceback:find('^.-\n.-\n')
traceback = traceback:sub(1, first_line_end) .. traceback:sub(second_line_end+1)
err = err .. '\n' .. traceback .. '\n\n' .. TRACEBACK_WARNING
else
-- Remove file path
err = err:sub(err:find('\n')+1)
end
local msg = string.format('In %d module of %s:',
moduleIndex, torch.type(self))
-- Preceding newline has to be here, because Lua will prepend a file path.
err = '\n' .. msg .. '\n' .. err
return err
end
-- Lua 5.1 doesn't support passing arguments through xpcall, so they have to
-- be passed via a closure. This incurs some overhead, so it's better not to
-- make it the default.
local ok, ret, noret
if not XPCALL_ARGS then
local args = {...}
local unpack = unpack or table.unpack
ok, ret, noret = xpcall(function()
return module[funcName](module, unpack(args))
end,
handleError)
else
ok, ret, noret = xpcall(module[funcName], handleError, module, ...)
end
assert(noret == nil, "rethrowErrors supports only one return argument")
if not ok then error(ret) end
return ret
end
function Container:applyToModules(func)
for _, module in ipairs(self.modules) do
func(module)
end
end
function Container:zeroGradParameters()
self:applyToModules(function(module) module:zeroGradParameters() end)
end
function Container:updateParameters(learningRate)
self:applyToModules(function(module) module:updateParameters(learningRate) end)
end
function Container:training()
self:applyToModules(function(module) module:training() end)
parent.training(self)
end
function Container:evaluate()
self:applyToModules(function(module) module:evaluate() end)
parent.evaluate(self)
end
function Container:share(mlp, ...)
for i=1,#self.modules do
self.modules[i]:share(mlp.modules[i], ...);
end
return self
end
function Container:reset(stdv)
self:applyToModules(function(module) module:reset(stdv) end)
end
function Container:parameters()
local function tinsert(to, from)
if type(from) == 'table' then
for i=1,#from do
tinsert(to,from[i])
end
else
table.insert(to,from)
end
end
local w = {}
local gw = {}
for i=1,#self.modules do
local mw,mgw = self.modules[i]:parameters()
if mw then
tinsert(w,mw)
tinsert(gw,mgw)
end
end
return w,gw
end
function Container:clearState()
-- don't call set because it might reset referenced tensors
local function clear(f)
if self[f] then
if torch.isTensor(self[f]) then
self[f] = self[f].new()
elseif type(self[f]) == 'table' then
self[f] = {}
else
self[f] = nil
end
end
end
clear('output')
clear('gradInput')
if self.modules then
for i,module in pairs(self.modules) do
module:clearState()
end
end
return self
end
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