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304 lines (280 loc) · 9.42 KB
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Copy pathFile.lua
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304 lines (280 loc) · 9.42 KB
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local File = torch.getmetatable('torch.File')
function File:writeBool(value)
if value then
self:writeInt(1)
else
self:writeInt(0)
end
end
function File:readBool()
return (self:readInt() == 1)
end
local TYPE_NIL = 0
local TYPE_NUMBER = 1
local TYPE_STRING = 2
local TYPE_TABLE = 3
local TYPE_TORCH = 4
local TYPE_BOOLEAN = 5
local TYPE_FUNCTION = 6
local TYPE_RECUR_FUNCTION = 7
function File:isWritableObject(object)
local typename = type(object)
local typeidx
if type(object) ~= 'boolean' and not object then
typeidx = TYPE_NIL
elseif torch.typename(object) and torch.factory(torch.typename(object)) then
typeidx = TYPE_TORCH
elseif typename == 'table' then
typeidx = TYPE_TABLE
elseif typename == 'number' then
typeidx = TYPE_NUMBER
elseif typename == 'string' then
typeidx = TYPE_STRING
elseif typename == 'boolean' then
typeidx = TYPE_BOOLEAN
elseif typename == 'function' and pcall(string.dump, object) then
typeidx = TYPE_RECUR_FUNCTION
end
return typeidx
end
function File:referenced(ref)
-- we use an environment to keep a record of written objects
if not torch.getenv(self).writeObjects then
torch.setenv(self, {writeObjects={}, writeObjectsRef={}, readObjects={}})
end
local env = torch.getenv(self)
env.force = not ref
torch.setenv(self,env)
return self
end
function File:isReferenced()
-- if no environment, then no forcing setup yet
if not torch.getenv(self).writeObjects then
return true
end
local env = torch.getenv(self)
return not env.force
end
function File:writeObject(object)
-- we use an environment to keep a record of written objects
if not torch.getenv(self).writeObjects then
torch.setenv(self, {writeObjects={}, writeObjectsRef={}, readObjects={}})
end
local force = torch.getenv(self).force
-- if nil object, only write the type and return
if type(object) ~= 'boolean' and not object then
self:writeInt(TYPE_NIL)
return
end
-- check the type we are dealing with
local typeidx = self:isWritableObject(object)
if not typeidx then
error(string.format('Unwritable object <%s>', type(object)))
end
self:writeInt(typeidx)
if typeidx == TYPE_NUMBER then
self:writeDouble(object)
elseif typeidx == TYPE_BOOLEAN then
self:writeBool(object)
elseif typeidx == TYPE_STRING then
local stringStorage = torch.CharStorage():string(object)
self:writeInt(#stringStorage)
self:writeChar(stringStorage)
elseif typeidx == TYPE_TORCH or typeidx == TYPE_TABLE or typeidx == TYPE_RECUR_FUNCTION then
-- check it exists already (we look at the pointer!)
local objects = torch.getenv(self).writeObjects
local objectsRef = torch.getenv(self).writeObjectsRef
local index = objects[torch.pointer(object)]
if index and (not force) then
-- if already exists, write only its index
self:writeInt(index)
else
-- else write the object itself
index = objects.nWriteObject or 0
index = index + 1
objects[torch.pointer(object)] = index
if not force then
objectsRef[object] = index -- we make sure the object is not going to disappear
end
self:writeInt(index)
objects.nWriteObject = index
if typeidx == TYPE_RECUR_FUNCTION then
local upvalues = {}
local counter = 0
while true do
counter = counter + 1
local name,value = debug.getupvalue(object, counter)
if not name then break end
table.insert(upvalues, value)
end
local dumped = string.dump(object)
local stringStorage = torch.CharStorage():string(dumped)
self:writeInt(#stringStorage)
self:writeChar(stringStorage)
self:writeObject(upvalues)
elseif typeidx == TYPE_TORCH then
local version = torch.CharStorage():string('V ' .. torch.version(object))
local className = torch.CharStorage():string(torch.typename(object))
self:writeInt(#version)
self:writeChar(version)
self:writeInt(#className)
self:writeChar(className)
if object.write then
object:write(self)
elseif type(object) == 'table' then
local var = {}
for k,v in pairs(object) do
if self:isWritableObject(v) then
var[k] = v
else
print(string.format('$ Warning: cannot write object field <%s>', k))
end
end
self:writeObject(var)
else
error(string.format('<%s> is a non-serializable Torch object', torch.typename(object)))
end
else -- it is a table
local size = 0; for k,v in pairs(object) do size = size + 1 end
self:writeInt(size)
for k,v in pairs(object) do
self:writeObject(k)
self:writeObject(v)
end
end
end
else
error('Unwritable object')
end
end
function File:readObject()
-- we use an environment to keep a record of read objects
if not torch.getenv(self).writeObjects then
torch.setenv(self, {writeObjects={}, writeObjectsRef={}, readObjects={}})
end
local force = torch.getenv(self).force
-- read the typeidx
local typeidx = self:readInt()
-- is it nil?
if typeidx == TYPE_NIL then
return nil
end
if typeidx == TYPE_NUMBER then
return self:readDouble()
elseif typeidx == TYPE_BOOLEAN then
return self:readBool()
elseif typeidx == TYPE_STRING then
local size = self:readInt()
return self:readChar(size):string()
elseif typeidx == TYPE_FUNCTION then
local size = self:readInt()
local dumped = self:readChar(size):string()
local func = loadstring(dumped)
local upvalues = self:readObject()
for index,upvalue in ipairs(upvalues) do
debug.setupvalue(func, index, upvalue)
end
return func
elseif typeidx == TYPE_TABLE or typeidx == TYPE_TORCH or typeidx == TYPE_RECUR_FUNCTION then
-- read the index
local index = self:readInt()
-- check it is loaded already
local objects = torch.getenv(self).readObjects
if objects[index] and not force then
return objects[index]
end
-- otherwise read it
if typeidx == TYPE_RECUR_FUNCTION then
local size = self:readInt()
local dumped = self:readChar(size):string()
local func = loadstring(dumped)
objects[index] = func
local upvalues = self:readObject()
for index,upvalue in ipairs(upvalues) do
debug.setupvalue(func, index, upvalue)
end
return func
elseif typeidx == TYPE_TORCH then
local version, className, versionNumber
version = self:readChar(self:readInt()):string()
versionNumber = tonumber(string.match(version, '^V (.*)$'))
if not versionNumber then
className = version
versionNumber = 0 -- file created before existence of versioning system
else
className = self:readChar(self:readInt()):string()
end
if not torch.factory(className) then
error(string.format('unknown Torch class <%s>', tostring(className)))
end
local object = torch.factory(className)()
objects[index] = object
if object.read then
object:read(self, versionNumber)
elseif type(object) == 'table' then
local var = self:readObject()
for k,v in pairs(var) do
object[k] = v
end
else
error(string.format('Cannot load object class <%s>', tostring(className)))
end
return object
else -- it is a table
local size = self:readInt()
local object = {}
objects[index] = object
for i = 1,size do
local k = self:readObject()
local v = self:readObject()
object[k] = v
end
return object
end
else
error('unknown object')
end
end
-- simple helpers to save/load arbitrary objects/tables
function torch.save(filename, object, mode)
mode = mode or 'binary'
local file = torch.DiskFile(filename, 'w')
file[mode](file)
file:writeObject(object)
file:close()
end
function torch.load(filename, mode)
mode = mode or 'binary'
local file = torch.DiskFile(filename, 'r')
file[mode](file)
local object = file:readObject()
file:close()
return object
end
-- simple helpers to serialize/deserialize arbitrary objects/tables
function torch.serialize(object, mode)
mode = mode or 'binary'
local f = torch.MemoryFile()
f = f[mode](f)
f:writeObject(object)
local s = f:storage():string()
f:close()
return s
end
function torch.deserialize(str, mode)
mode = mode or 'binary'
local x = torch.CharStorage():string(str)
local tx = torch.CharTensor(x)
local xp = torch.CharStorage(x:size(1)+1)
local txp = torch.CharTensor(xp)
txp:narrow(1,1,tx:size(1)):copy(tx)
txp[tx:size(1)+1] = 0
local f = torch.MemoryFile(xp)
f = f[mode](f)
local object = f:readObject()
f:close()
return object
end
-- public API (saveobj/loadobj are safe for global import)
torch.saveobj = torch.save
torch.loadobj = torch.load