-- The following methods must be implemented to let a layer work properly
local Param = nerv.class('nerv.Param')
function Param:__init(id, global_conf)
self.id = id
self.gconf = global_conf
end
function Param:get_info()
return self.info
end
function Param:set_info(info)
self.info = info
end
function Param:read(handle)
nerv.error_method_not_implemented()
end
function Param:write(handle)
nerv.error_method_not_implemented()
end
function Param:update(gradient)
nerv.error_method_not_implemented()
end
function Param:gen_zero()
return 0
end
local Layer = nerv.class('nerv.Layer')
function Layer:__init(id, global_conf, layer_conf)
self.id = id
self.gconf = global_conf
self.lconf = layer_conf
if self.gconf.use_cpu then
self.mat_type = self.gconf.mmat_type
self.loc_type = nerv.ParamRepo.LOC_TYPES.ON_HOST
else
self.mat_type = self.gconf.cumat_type
self.loc_type = nerv.ParamRepo.LOC_TYPES.ON_DEVICE
end
self.dim_in = layer_conf.dim_in
self.dim_out = layer_conf.dim_out
end
function Layer:init(batch_size)
nerv.error_method_not_implemented()
end
function Layer:update(bp_err, input, output)
nerv.error_method_not_implemented()
end
function Layer:propagate(input, output)
nerv.error_method_not_implemented()
end
function Layer:back_propagate(bp_err, next_bp_err, input, output)
nerv.error_method_not_implemented()
end
function Layer:check_dim_len(len_in, len_out)
local expected_in = #self.dim_in
local expected_out = #self.dim_out
if len_in > 0 and expected_in ~= len_in then
nerv.error("layer %s expects %d inputs, %d given",
self.id, len_in, expected_in)
end
if len_out > 0 and expected_out ~= len_out then
nerv.error("layer %s expects %d outputs, %d given",
self.id, len_out, expected_out)
end
end
function Layer:get_params()
nerv.error_method_not_implemented()
end
function Layer:bind_params()
nerv.error_method_not_implemented()
end
function Layer:get_dim()
return self.dim_in, self.dim_out
end
function Layer:set_attr(name, value)
self[name] = value
end
function Layer:get_sublayer(id)
nerv.error('primitive layer does not have sublayers')
end
function Layer:find_param(plist, lconf, gconf, p_type, p_dim, p_gen)
if type(plist) == "string" then
plist = {plist}
end
if lconf.params == nil then
lconf.params = {}
end
plist_str = table.tostring(plist)
local pid
for i, pname in ipairs(plist) do
if lconf.params[pname] ~= nil then
nerv.info("param id for [%s] of layer [%s] specified in `layer_conf.params`.", pname, self.id)
pid = lconf.params[pname]
end
if lconf.pr:has_param(pid) then
return lconf.pr:get_param(pid)
end
pid = self.id .. '_' .. pname
if lconf.pr:has_param(pid) then
nerv.info("param id for [%s] of layer [%s] is generated automatically.", plist[1], self.id)
return lconf.pr:get_param(pid)
end
end
pid = self.id .. '_' .. plist[1]
nerv.info("param id for [%s] of layer [%s] is not found in the specified param repo, " ..
"switch to auto-generate", plist_str, self.id)
local p = p_type(pid, gconf)
p.trans = self.mat_type(unpack(p_dim))
p_gen = p_gen or gconf.param_gen
or gconf.param_random -- obsolete name
if type(p_gen) ~= "function" then
nerv.error("a param generate function is needed")
end
p.trans:generate(p_gen)
return p
end
nerv.include('graph.lua')
nerv.include('affine.lua')
nerv.include('sigmoid.lua')
nerv.include('tanh.lua')
nerv.include('softmax_ce.lua')
nerv.include('bias.lua')
nerv.include('window.lua')
nerv.include('mse.lua')
nerv.include('combiner.lua')
nerv.include('softmax.lua')
nerv.include('elem_mul.lua')
nerv.include('lstm.lua')
nerv.include('lstm_gate.lua')
nerv.include('dropout.lua')
nerv.include('gru.lua')
nerv.include('rnn.lua')
nerv.include('duplicate.lua')
nerv.include('identity.lua')
-- The following lines are for backward compatibility, and will be removed in
-- the future. The use of these names are deprecated.
nerv.DropoutLayerT = nerv.DropoutLayer
nerv.GRULayerT = nerv.GRULayer
nerv.LSTMLayerT = nerv.LSTMLayer
nerv.SoftmaxCELayerT = nerv.SoftmaxCELayer