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--- NERV: a Lua-based toolkit for high-performance deep learning.
-- This file contains misc utility functions of NERV and finally initializes
-- NERV by including `init.lua` of other basic modules.
-- @author Ted Yin <ted.sybil@gmail.com>
-- @module nerv
require 'libnerv'
--- Dummy function.
-- Display a friendly error message when user attempts to invoke a
-- non-implemented function.
function nerv.error_method_not_implemented()
nerv.error("method not implemented");
end
--- Format a string just like `sprintf` in C.
-- @param fmt the format string
-- @param ... args, the data to be formatted
-- @return the formatted string
function nerv.sprintf(fmt, ...)
return string.format(fmt, ...)
end
--- Print a formatted string to stdout.
-- @param fmt the format string
-- @param ... args, the data to be formatted
function nerv.printf(fmt, ...)
io.write(nerv.sprintf(fmt, ...))
end
--- Raise an global error with the formatted message.
-- @param fmt the format string
-- @param ... args, the data to be formatted
function nerv.error(fmt, ...)
error(nerv.sprintf("[nerv] internal error: " .. fmt .. "\n", ...))
end
--- Print a notification message that begins with "info" and a timestamp.
-- Instead of using `nerv.printf`, normal users should use this to print any
-- notification information.
-- @param fmt the format string
-- @param ... args, the data to be formatted
function nerv.info(fmt, ...)
nerv.printf(
string.format("(%s)[nerv] info: %s\n",
os.date("%H:%M:%S %F"), fmt), ...)
end
--- Print a warning message that begins with "warning" and a timestamp.
-- Instead of using `nerv.printf`, normal users should use this to print any
-- warnings.
-- @param fmt the format string
-- @param ... args, the data to be formatted
function nerv.warning(fmt, ...)
nerv.printf(
string.format("(%s)[nerv] warning: %s\n",
os.date("%H:%M:%S %F"), fmt), ...)
end
--- Create a class (Torch-compatible).
-- Use this to create a class in NERV.
-- @param tname the class name
-- @param parenttname the parent class name (from which it inherits)
-- @return the created class
function nerv.class(tname, parenttname)
local function constructor(...)
local self = {}
nerv.setmetatable(self, tname)
if self.__init then
self:__init(...)
end
return self
end
local function factory()
local self = {}
nerv.setmetatable(self, tname)
return self
end
local mt = nerv.newmetatable(tname, parenttname, constructor, nil, factory)
local mpt
if parenttname then
mpt = nerv.getmetatable(parenttname)
end
return mt, mpt
end
function table.val_to_str(v)
if "string" == type(v) then
v = string.gsub(v, "\n", "\\n")
if string.match(string.gsub(v,"[^'\"]",""), '^"+$') then
return "'" .. v .. "'"
end
return '"' .. string.gsub(v,'"', '\\"') .. '"'
else
return "table" == type(v) and table.tostring(v) or
tostring(v)
end
end
function table.key_to_str (k)
if "string" == type(k) and string.match(k, "^[_%a][_%a%d]*$") then
return k
else
return "[" .. table.val_to_str(k) .. "]"
end
end
--- Get the string representation of a table, which can be executed as a valid
-- piece of Lua code.
-- @param tbl the table
-- @return the string representation which will result in a Lua table entity
-- when evaluated
function table.tostring(tbl)
local result, done = {}, {}
for k, v in ipairs(tbl) do
table.insert(result, table.val_to_str(v))
done[k] = true
end
for k, v in pairs(tbl) do
if not done[k] then
table.insert(result,
table.key_to_str(k) .. "=" .. table.val_to_str(v))
end
end
return "{" .. table.concat(result, ",") .. "}"
end
--- Get the class by name.
-- @param tname the name of the class
-- @return the class entity
function nerv.get_type(tname)
return assert(loadstring("return " .. tname))()
end
--- Check if the object is of the certain class.
-- @param obj the object ("class instance")
-- @param tname the class name ("type name")
function nerv.is_type(obj, tname)
local mt0 = nerv.getmetatable(tname)
local mt = getmetatable(obj)
while mt do
if mt == mt0 then
return true
end
mt = getmetatable(mt)
end
return false
end
--- Strip last component from file name.
-- @param filename the path to a file
-- @return the path to the containing directory
function nerv.dirname(filename)
if filename:match(".-/.-") then
local name = string.gsub(filename, "(.*/)(.*)", "%1")
return name
else
return ''
end
end
--- Include a script file (chunk) into the current script.
-- An analogy to `#include` in C. Note that the effect is the same as executing
-- `dofile(filename)` at the current line.
-- @param filename the path to a file
-- @return all values returned by the chunk
function nerv.include(filename)
local caller = debug.getinfo(2, "S").source:sub(2)
return dofile(nerv.dirname(caller) .. filename)
end
-- the following lines trigger the initialization of basic modules
nerv.include('matrix/init.lua')
nerv.include('io/init.lua')
nerv.include('layer/init.lua')
nerv.include('nn/init.lua')
nerv.include('tnn/init.lua')
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