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train.lua
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train.lua
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require 'nn'
require 'nngraph'
require 'hdf5'
require 'data.lua'
require 'models.lua'
require 'utils.lua'
cmd = torch.CmdLine()
-- data files
cmd:text("")
cmd:text("**Data options**")
cmd:text("")
cmd:option('-data_file','data/entail-train.hdf5', [[Path to the training *.hdf5 file]])
cmd:option('-val_data_file', 'data/entail-val.hdf5', [[Path to validation *.hdf5 file]])
cmd:option('-test_data_file','data/entail-test.hdf5',[[Path to test *.hdf5 file]])
cmd:option('-savefile', 'model', [[Savefile name]])
-- model specs
cmd:option('-hidden_size', 200, [[MLP hidden layer size]])
cmd:option('-word_vec_size', 300, [[Word embedding size]])
cmd:option('-share_params',1, [[Share parameters between the two sentence encoders]])
cmd:option('-dropout', 0.2, [[Dropout probability.]])
-- optimization
cmd:option('-epochs', 100, [[Number of training epochs]])
cmd:option('-param_init', 0.01, [[Parameters are initialized over uniform distribution with support
(-param_init, param_init)]])
cmd:option('-optim', 'adagrad', [[Optimization method. Possible options are:
sgd (vanilla SGD), adagrad, adadelta, adam]])
cmd:option('-learning_rate', 0.05, [[Starting learning rate. If adagrad/adadelta/adam is used,
then this is the global learning rate.]])
cmd:option('-pre_word_vecs', 'glove.hdf5', [[If a valid path is specified, then this will load
pretrained word embeddings (hdf5 file)]])
cmd:option('-fix_word_vecs', 1, [[If = 1, fix word embeddings]])
cmd:option('-max_batch_l', '', [[If blank, then it will infer the max batch size from the
data.]])
cmd:option('-gpuid', -1, [[Which gpu to use. -1 = use CPU]])
cmd:option('-print_every', 1000, [[Print stats after this many batches]])
cmd:option('-seed', 3435, [[Seed for random initialization]])
opt = cmd:parse(arg)
torch.manualSeed(opt.seed)
function zero_table(t)
for i = 1, #t do
t[i]:zero()
end
end
function train(train_data, valid_data)
local timer = torch.Timer()
local start_decay = 0
params, grad_params = {}, {}
opt.train_perf = {}
opt.val_perf = {}
for i = 1, #layers do
local p, gp = layers[i]:getParameters()
local rand_vec = torch.randn(p:size(1)):mul(opt.param_init)
if opt.gpuid >= 0 then
rand_vec = rand_vec:cuda()
end
p:copy(rand_vec)
params[i] = p
grad_params[i] = gp
end
if opt.pre_word_vecs:len() > 0 then
print("loading pre-trained word vectors")
local f = hdf5.open(opt.pre_word_vecs)
local pre_word_vecs = f:read('word_vecs'):all()
for i = 1, pre_word_vecs:size(1) do
word_vecs_enc1.weight[i]:copy(pre_word_vecs[i])
word_vecs_enc2.weight[i]:copy(pre_word_vecs[i])
end
end
--copy shared params
params[2]:copy(params[1])
if opt.share_params == 1 then
all_layers.proj2.weight:copy(all_layers.proj1.weight)
for k = 2, 5, 3 do
all_layers.f2.modules[k].weight:copy(all_layers.f1.modules[k].weight)
all_layers.f2.modules[k].bias:copy(all_layers.f1.modules[k].bias)
all_layers.g2.modules[k].weight:copy(all_layers.g1.modules[k].weight)
all_layers.g2.modules[k].bias:copy(all_layers.g1.modules[k].bias)
end
end
-- prototypes for gradients so there is no need to clone
word_vecs1_grad_proto = torch.zeros(opt.max_batch_l, opt.max_sent_l_src, opt.word_vec_size)
word_vecs2_grad_proto = torch.zeros(opt.max_batch_l, opt.max_sent_l_targ, opt.word_vec_size)
if opt.gpuid >= 0 then
cutorch.setDevice(opt.gpuid)
word_vecs1_grad_proto = word_vecs1_grad_proto:cuda()
word_vecs2_grad_proto = word_vecs2_grad_proto:cuda()
end
function train_batch(data, epoch)
local train_loss = 0
local train_sents = 0
local batch_order = torch.randperm(data.length) -- shuffle mini batch order
local start_time = timer:time().real
local num_words_target = 0
local num_words_source = 0
local train_num_correct = 0
sent_encoder:training()
for i = 1, data:size() do
zero_table(grad_params, 'zero')
local d = data[batch_order[i]]
local target, source, batch_l, target_l, source_l, label = table.unpack(d)
-- resize the various temporary tensors that are going to hold contexts/grads
local word_vecs1_grads = word_vecs1_grad_proto[{{1, batch_l}, {1, source_l}}]:zero()
local word_vecs2_grads = word_vecs2_grad_proto[{{1, batch_l}, {1, target_l}}]:zero()
local word_vecs1 = word_vecs_enc1:forward(source)
local word_vecs2 = word_vecs_enc2:forward(target)
set_size_encoder(batch_l, source_l, target_l,
opt.word_vec_size, opt.hidden_size, all_layers)
local pred_input = {word_vecs1, word_vecs2}
local pred_label = sent_encoder:forward(pred_input)
local _, pred_argmax = pred_label:max(2)
train_num_correct = train_num_correct + pred_argmax:double():view(batch_l):eq(label:double()):sum()
local loss = disc_criterion:forward(pred_label, label)
local dl_dp = disc_criterion:backward(pred_label, label)
dl_dp:div(batch_l)
local dl_dinput1, dl_dinput2 = table.unpack(sent_encoder:backward(pred_input, dl_dp))
word_vecs_enc1:backward(source, dl_dinput1)
word_vecs_enc2:backward(target, dl_dinput2)
if opt.fix_word_vecs == 1 then
word_vecs_enc1.gradWeight:zero()
word_vecs_enc2.gradWeight:zero()
end
grad_params[1]:add(grad_params[2])
grad_params[2]:zero()
if opt.share_params == 1 then
all_layers.proj1.gradWeight:add(all_layers.proj2.gradWeight)
all_layers.proj2.gradWeight:zero()
for k = 2, 5, 3 do
all_layers.f1.modules[k].gradWeight:add(all_layers.f2.modules[k].gradWeight)
all_layers.f1.modules[k].gradBias:add(all_layers.f2.modules[k].gradBias)
all_layers.g1.modules[k].gradWeight:add(all_layers.g2.modules[k].gradWeight)
all_layers.g1.modules[k].gradBias:add(all_layers.g2.modules[k].gradBias)
all_layers.f2.modules[k].gradWeight:zero()
all_layers.f2.modules[k].gradBias:zero()
all_layers.g2.modules[k].gradWeight:zero()
all_layers.g2.modules[k].gradBias:zero()
end
end
-- Update params
for j = 1, #grad_params do
if opt.optim == 'adagrad' then
adagrad_step(params[j], grad_params[j], layer_etas[j], optStates[j])
elseif opt.optim == 'adadelta' then
adadelta_step(params[j], grad_params[j], layer_etas[j], optStates[j])
elseif opt.optim == 'adam' then
adam_step(params[j], grad_params[j], layer_etas[j], optStates[j])
else
params[j]:add(grad_params[j]:mul(-opt.learning_rate))
end
end
params[2]:copy(params[1])
if opt.share_params == 1 then
all_layers.proj2.weight:copy(all_layers.proj1.weight)
for k = 2, 5, 3 do
all_layers.f2.modules[k].weight:copy(all_layers.f1.modules[k].weight)
all_layers.f2.modules[k].bias:copy(all_layers.f1.modules[k].bias)
all_layers.g2.modules[k].weight:copy(all_layers.g1.modules[k].weight)
all_layers.g2.modules[k].bias:copy(all_layers.g1.modules[k].bias)
end
end
-- Bookkeeping
num_words_target = num_words_target + batch_l*target_l
num_words_source = num_words_source + batch_l*source_l
train_loss = train_loss + loss
train_sents = train_sents + batch_l
local time_taken = timer:time().real - start_time
if i % opt.print_every == 0 then
local stats = string.format('Epoch: %d, Batch: %d/%d, Batch size: %d, LR: %.4f, ',
epoch, i, data:size(), batch_l, opt.learning_rate)
stats = stats .. string.format('NLL: %.4f, Acc: %.4f, ',
train_loss/train_sents, train_num_correct/train_sents)
stats = stats .. string.format('Training: %d total tokens/sec',
(num_words_target+num_words_source) / time_taken)
print(stats)
end
end
return train_loss, train_sents, train_num_correct
end
local best_val_perf = 0
local test_perf = 0
for epoch = 1, opt.epochs do
local total_loss, total_sents, total_correct = train_batch(train_data, epoch)
local train_score = total_correct/total_sents
print('Train', train_score)
opt.train_perf[#opt.train_perf + 1] = train_score
local score = eval(valid_data)
local savefile = string.format('%s.t7', opt.savefile)
if score > best_val_perf then
best_val_perf = score
test_perf = eval(test_data)
print('saving checkpoint to ' .. savefile)
torch.save(savefile, {layers, opt})
end
opt.val_perf[#opt.val_perf + 1] = score
print(opt.train_perf)
print(opt.val_perf)
end
print("Best Val", best_val_perf)
print("Test", test_perf)
-- save final model
local savefile = string.format('%s_final.t7', opt.savefile)
print('saving final model to ' .. savefile)
for i = 1, #layers do
layers[i]:double()
end
torch.save(savefile, {layers, opt})
end
function eval(data)
sent_encoder:evaluate()
local nll = 0
local num_sents = 0
local num_correct = 0
for i = 1, data:size() do
local d = data[i]
local target, source, batch_l, target_l, source_l, label = table.unpack(d)
local word_vecs1 = word_vecs_enc1:forward(source)
local word_vecs2 = word_vecs_enc2:forward(target)
set_size_encoder(batch_l, source_l, target_l,
opt.word_vec_size, opt.hidden_size, all_layers)
local pred_input = {word_vecs1, word_vecs2}
local pred_label = sent_encoder:forward(pred_input)
local loss = disc_criterion:forward(pred_label, label)
local _, pred_argmax = pred_label:max(2)
num_correct = num_correct + pred_argmax:double():view(batch_l):eq(label:double()):sum()
num_sents = num_sents + batch_l
nll = nll + loss
end
local acc = num_correct/num_sents
print("Acc", acc)
print("NLL", nll / num_sents)
collectgarbage()
return acc
end
function main()
-- parse input params
opt = cmd:parse(arg)
if opt.gpuid >= 0 then
print('using CUDA on GPU ' .. opt.gpuid .. '...')
require 'cutorch'
require 'cunn'
cutorch.setDevice(opt.gpuid)
cutorch.manualSeed(opt.seed)
end
-- Create the data loader class.
print('loading data...')
train_data = data.new(opt, opt.data_file)
valid_data = data.new(opt, opt.val_data_file)
test_data = data.new(opt, opt.test_data_file)
print('done!')
print(string.format('Source vocab size: %d, Target vocab size: %d',
train_data.source_size, train_data.target_size))
opt.max_sent_l_src = train_data.source:size(2)
opt.max_sent_l_targ = train_data.target:size(2)
if opt.max_batch_l == '' then
opt.max_batch_l = train_data.batch_l:max()
end
print(string.format('Source max sent len: %d, Target max sent len: %d',
train_data.source:size(2), train_data.target:size(2)))
-- Build model
word_vecs_enc1 = nn.LookupTable(train_data.source_size, opt.word_vec_size)
word_vecs_enc2 = nn.LookupTable(train_data.target_size, opt.word_vec_size)
sent_encoder = make_sent_encoder(opt.word_vec_size, opt.hidden_size,
train_data.label_size, opt.dropout)
disc_criterion = nn.ClassNLLCriterion()
disc_criterion.sizeAverage = false
layers = {word_vecs_enc1, word_vecs_enc2, sent_encoder}
layer_etas = {}
optStates = {}
for i = 1, #layers do
layer_etas[i] = opt.learning_rate -- can have layer-specific lr, if desired
optStates[i] = {}
end
if opt.gpuid >= 0 then
for i = 1, #layers do
layers[i]:cuda()
end
disc_criterion:cuda()
end
-- these layers will be manipulated during training
all_layers = {}
sent_encoder:apply(get_layer)
train(train_data, valid_data)
end
main()