def train(dim_word=100, # word vector dimensionality
ctx_dim=512, # context vector dimensionality
dim=1000, # the number of LSTM units
attn_type='stochastic', # [see section 4 from paper]
n_layers_att=1, # number of layers used to compute the attention weights
n_layers_out=1, # number of layers used to compute logit
n_layers_lstm=1, # number of lstm layers
n_layers_init=1, # number of layers to initialize LSTM at time 0
lstm_encoder=False, # if True, run bidirectional LSTM on input units
prev2out=False, # Feed previous word into logit
ctx2out=False, # Feed attention weighted ctx into logit
alpha_entropy_c=0.002, # hard attn param
RL_sumCost=True, # hard attn param
semi_sampling_p=0.5, # hard attn param
temperature=1., # hard attn param
patience=10,
max_epochs=5000,
dispFreq=100,
decay_c=0., # weight decay coeff
alpha_c=0., # doubly stochastic coeff
lrate=0.01, # used only for SGD
selector=False, # selector (see paper)
n_words=10000, # vocab size
maxlen=100, # maximum length of the description
optimizer='rmsprop',
batch_size = 16,
valid_batch_size = 16,
saveto='model.npz', # relative path of saved model file
validFreq=1000,
saveFreq=1000, # save the parameters after every saveFreq updates
sampleFreq=100, # generate some samples after every sampleFreq updates
data_path='./data', # path to find data
dataset='flickr8k',
dictionary=None, # word dictionary
use_dropout=False, # setting this true turns on dropout at various points
use_dropout_lstm=False, # dropout on lstm gates
reload_=False,
save_per_epoch=False): # this saves down the model every epoch
# hyperparam dict
model_options = locals().copy()
model_options = validate_options(model_options)
# reload options
if reload_ and os.path.exists(saveto):
print "Reloading options"
with open('%s.pkl'%saveto, 'rb') as f:
model_options = pkl.load(f)
print "Using the following parameters:"
print model_options
print 'Loading data'
load_data, prepare_data = get_dataset(dataset)
train, valid, test, worddict = load_data(path=data_path)
if dataset == 'coco':
valid, _ = valid # the second one contains all the validation data
# index 0 and 1 always code for the end of sentence and unknown token
word_idict = dict()
for kk, vv in worddict.iteritems():
word_idict[vv] = kk
word_idict[0] = '<eos>'
word_idict[1] = 'UNK'
# Initialize (or reload) the parameters using 'model_options'
# then build the Theano graph
print 'Building model'
params = init_params(model_options)
if reload_ and os.path.exists(saveto):
print "Reloading model"
params = load_params(saveto, params)
# numpy arrays -> theano shared variables
tparams = init_tparams(params)
# In order, we get:
# 1) trng - theano random number generator
# 2) use_noise - flag that turns on dropout
# 3) inps - inputs for f_grad_shared
# 4) cost - log likelihood for each sentence
# 5) opts_out - optional outputs (e.g selector)
trng, use_noise, \
inps, alphas, alphas_sample,\
cost, \
opt_outs = \
build_model(tparams, model_options)
# To sample, we use beam search: 1) f_init is a function that initializes
# the LSTM at time 0 [see top right of page 4], 2) f_next returns the distribution over
# words and also the new "initial state/memory" see equation
print 'Building sampler'
f_init, f_next = build_sampler(tparams, model_options, use_noise, trng)
# we want the cost without any the regularizers
# define the log probability
f_log_probs = theano.function(inps, -cost, profile=False,
updates=opt_outs['attn_updates']
if model_options['attn_type']=='stochastic'
else None, allow_input_downcast=True)
# Define the cost function + Regularization
cost = cost.mean()
# add L2 regularization costs
if decay_c > 0.:
decay_c = theano.shared(numpy.float32(decay_c), name='decay_c')
weight_decay = 0.
for kk, vv in tparams.iteritems():
weight_decay += (vv ** 2).sum()
weight_decay *= decay_c
cost += weight_decay
# Doubly stochastic regularization
if alpha_c > 0.:
alpha_c = theano.shared(numpy.float32(alpha_c), name='alpha_c')
alpha_reg = alpha_c * ((1.-alphas.sum(0))**2).sum(0).mean()
cost += alpha_reg
hard_attn_updates = []
# Backprop!
if model_options['attn_type'] == 'deterministic':
grads = tensor.grad(cost, wrt=itemlist(tparams))
else:
# shared variables for hard attention
baseline_time = theano.shared(numpy.float32(0.), name='baseline_time')
opt_outs['baseline_time'] = baseline_time
alpha_entropy_c = theano.shared(numpy.float32(alpha_entropy_c), name='alpha_entropy_c')
alpha_entropy_reg = alpha_entropy_c * (alphas*tensor.log(alphas)).mean()
# [see Section 4.1: Stochastic "Hard" Attention for derivation of this learning rule]
if model_options['RL_sumCost']:
grads = tensor.grad(cost, wrt=itemlist(tparams),
disconnected_inputs='raise',
known_grads={alphas:(baseline_time-opt_outs['masked_cost'].mean(0))[None,:,None]/10.*
(-alphas_sample/alphas) + alpha_entropy_c*(tensor.log(alphas) + 1)})
else:
grads = tensor.grad(cost, wrt=itemlist(tparams),
disconnected_inputs='raise',
known_grads={alphas:opt_outs['masked_cost'][:,:,None]/10.*
(alphas_sample/alphas) + alpha_entropy_c*(tensor.log(alphas) + 1)})
# [equation on bottom left of page 5]
hard_attn_updates += [(baseline_time, baseline_time * 0.9 + 0.1 * opt_outs['masked_cost'].mean())]
# updates from scan
hard_attn_updates += opt_outs['attn_updates']
# to getthe cost after regularization or the gradients, use this
# f_cost = theano.function([x, mask, ctx], cost, profile=False)
# f_grad = theano.function([x, mask, ctx], grads, profile=False)
# f_grad_shared computes the cost and updates adaptive learning rate variables
# f_update updates the weights of the model
lr = tensor.scalar(name='lr')
f_grad_shared, f_update = eval(optimizer)(lr, tparams, grads, inps, cost, hard_attn_updates)
print 'Optimization'
# [See note in section 4.3 of paper]
train_iter = HomogeneousData(train, batch_size=batch_size, maxlen=maxlen)
if valid:
kf_valid = KFold(len(valid[0]), n_folds=len(valid[0])/valid_batch_size, shuffle=False)
if test:
kf_test = KFold(len(test[0]), n_folds=len(test[0])/valid_batch_size, shuffle=False)
# history_errs is a bare-bones training log that holds the validation and test error
history_errs = []
# reload history
if reload_ and os.path.exists(saveto):
history_errs = numpy.load(saveto)['history_errs'].tolist()
best_p = None
bad_counter = 0
if validFreq == -1:
validFreq = len(train[0])/batch_size
if saveFreq == -1:
saveFreq = len(train[0])/batch_size
if sampleFreq == -1:
sampleFreq = len(train[0])/batch_size
uidx = 0
estop = False
for eidx in xrange(max_epochs):
n_samples = 0
print 'Epoch ', eidx
for caps in train_iter:
n_samples += len(caps)
uidx += 1
# turn on dropout
use_noise.set_value(1.)
# preprocess the caption, recording the
# time spent to help detect bottlenecks
pd_start = time.time()
x, mask, ctx = prepare_data(caps,
train[1],
worddict,
maxlen=maxlen,
n_words=n_words)
pd_duration = time.time() - pd_start
if x is None:
print 'Minibatch with zero sample under length ', maxlen
continue
# get the cost for the minibatch, and update the weights
ud_start = time.time()
cost = f_grad_shared(x, mask, ctx)
f_update(lrate)
ud_duration = time.time() - ud_start # some monitoring for each mini-batch
# Numerical stability check
if numpy.isnan(cost) or numpy.isinf(cost):
print 'NaN detected'
return 1., 1., 1.
if numpy.mod(uidx, dispFreq) == 0:
print 'Epoch ', eidx, 'Update ', uidx, 'Cost ', cost, 'PD ', pd_duration, 'UD ', ud_duration
# Checkpoint
if numpy.mod(uidx, saveFreq) == 0:
print 'Saving...',
if best_p is not None:
params = copy.copy(best_p)
else:
params = unzip(tparams)
numpy.savez(saveto, history_errs=history_errs, **params)
pkl.dump(model_options, open('%s.pkl'%saveto, 'wb'))
print 'Done'
# Print a generated sample as a sanity check
if numpy.mod(uidx, sampleFreq) == 0:
# turn off dropout first
use_noise.set_value(0.)
x_s = x
mask_s = mask
ctx_s = ctx
# generate and decode the a subset of the current training batch
for jj in xrange(numpy.minimum(10, len(caps))):
sample, score = gen_sample(tparams, f_init, f_next, ctx_s[jj], model_options,
trng=trng, k=5, maxlen=30, stochastic=False)
# Decode the sample from encoding back to words
print 'Truth ',jj,': ',
for vv in x_s[:,jj]:
if vv == 0:
break
if vv in word_idict:
print word_idict[vv],
else:
print 'UNK',
print
for kk, ss in enumerate([sample[0]]):
print 'Sample (', kk,') ', jj, ': ',
for vv in ss:
if vv == 0:
break
if vv in word_idict:
print word_idict[vv],
else:
print 'UNK',
print
# Log validation loss + checkpoint the model with the best validation log likelihood
if numpy.mod(uidx, validFreq) == 0:
use_noise.set_value(0.)
train_err = 0
valid_err = 0
test_err = 0
if valid:
valid_err = -pred_probs(f_log_probs, model_options, worddict, prepare_data, valid, kf_valid).mean()
if test:
test_err = -pred_probs(f_log_probs, model_options, worddict, prepare_data, test, kf_test).mean()
history_errs.append([valid_err, test_err])
# the model with the best validation long likelihood is saved seperately with a different name
if uidx == 0 or valid_err <= numpy.array(history_errs)[:,0].min():
best_p = unzip(tparams)
print 'Saving model with best validation ll'
params = copy.copy(best_p)
params = unzip(tparams)
numpy.savez(saveto+'_bestll', history_errs=history_errs, **params)
bad_counter = 0
# abort training if perplexity has been increasing for too long
if eidx > patience and len(history_errs) > patience and valid_err >= numpy.array(history_errs)[:-patience,0].min():
bad_counter += 1
if bad_counter > patience:
print 'Early Stop!'
estop = True
break
print 'Train ', train_err, 'Valid ', valid_err, 'Test ', test_err
print 'Seen %d samples' % n_samples
if estop:
break
if save_per_epoch:
numpy.savez(saveto + '_epoch_' + str(eidx + 1), history_errs=history_errs, **unzip(tparams))
# use the best nll parameters for final checkpoint (if they exist)
if best_p is not None:
zipp(best_p, tparams)
use_noise.set_value(0.)
train_err = 0
valid_err = 0
test_err = 0
if valid:
valid_err = -pred_probs(f_log_probs, model_options, worddict, prepare_data, valid, kf_valid)
if test:
test_err = -pred_probs(f_log_probs, model_options, worddict, prepare_data, test, kf_test)
print 'Train ', train_err, 'Valid ', valid_err, 'Test ', test_err
params = copy.copy(best_p)
numpy.savez(saveto, zipped_params=best_p, train_err=train_err,
valid_err=valid_err, test_err=test_err, history_errs=history_errs,
**params)
return train_err, valid_err, test_err
def main(model,
saveto,
k=5,
normalize=False,
zero_pad=False,
n_process=5,
datasets='dev,test',
sampling=False,
pkl_name=None):
# load model model_options
if pkl_name is None:
pkl_name = model
with open('%s.pkl' % pkl_name, 'rb') as f:
options = pkl.load(f)
# fetch data, skip ones we aren't using to save time
load_data, prepare_data = get_dataset(options['dataset'])
_, valid, test, worddict = load_data(
path='./data',
load_train=False,
load_dev=True if 'dev' in datasets else False,
load_test=True if 'test' in datasets else False)
# <eos> means end of sequence (aka periods), UNK means unknown
word_idict = dict()
for kk, vv in worddict.iteritems():
word_idict[vv] = kk
word_idict[0] = '<eos>'
word_idict[1] = 'UNK'
# create processes
queue = Queue()
rqueue = Queue()
processes = [None] * n_process
for midx in xrange(n_process):
processes[midx] = Process(target=gen_model,
args=(queue, rqueue, midx, model, options, k,
normalize, word_idict, sampling))
processes[midx].start()
# index -> words
def _seqs2words(caps):
capsw = []
for cc in caps:
ww = []
for w in cc:
if w == 0:
break
ww.append(word_idict[w])
capsw.append(' '.join(ww))
return capsw
# unsparsify, reshape, and queue
def _send_jobs(contexts):
for idx, ctx in enumerate(contexts):
cc = ctx.todense().reshape([14 * 14, 512])
if zero_pad:
cc0 = numpy.zeros(
(cc.shape[0] + 1, cc.shape[1])).astype('float32')
cc0[:-1, :] = cc
else:
cc0 = cc
queue.put((idx, cc0))
# retrieve caption from process
def _retrieve_jobs(n_samples):
caps = [None] * n_samples
for idx in xrange(n_samples):
resp = rqueue.get()
caps[resp[0]] = resp[1]
if numpy.mod(idx, 10) == 0:
print 'Sample ', (idx + 1), '/', n_samples, ' Done'
return caps
ds = datasets.strip().split(',')
# send all the features for the various datasets
for dd in ds:
if dd == 'dev':
print 'Development Set...',
_send_jobs(valid[1])
caps = _seqs2words(_retrieve_jobs(valid[1].shape[0]))
import pdb
pdb.set_trace()
with open(saveto + '.dev.txt', 'w') as f:
print >> f, '\n'.join(caps)
print 'Done'
if dd == 'test':
print 'Test Set...',
_send_jobs(test[1])
caps = _seqs2words(_retrieve_jobs(test[1].shape[0]))
with open(saveto + '.test.txt', 'w') as f:
print >> f, '\n'.join(caps)
print 'Done'
# end processes
for midx in xrange(n_process):
queue.put(None)
def main(model,
saveto,
k=5,
normalize=False,
zero_pad=False,
datasets='dev,test',
sampling=False,
pkl_name=None):
# load model model_options
if pkl_name is None:
pkl_name = model
with open('%s.pkl' % pkl_name, 'rb') as f:
options = pkl.load(f)
# fetch data, skip ones we aren't using to save time
load_data, prepare_data = get_dataset(options['dataset'])
train, valid, test, worddict = load_data(
path='./data/coco/',
load_train=True if 'train' in datasets else False,
load_dev=True if 'dev' in datasets else False,
load_test=True if 'test' in datasets else False)
# import pdb; pdb.set_trace()
# <eos> means end of sequence (aka periods), UNK means unknown
word_idict = dict()
for kk, vv in worddict.iteritems():
word_idict[vv] = kk
word_idict[0] = '<eos>'
word_idict[1] = 'UNK'
# index -> words
def _seqs2words(caps):
capsw = []
for cc in caps:
ww = []
for w in cc:
if w == 0:
break
ww.append(word_idict[w])
capsw.append(' '.join(ww))
return capsw
# process all dev examples
def _process_examples(contexts):
caps = [None] * contexts.shape[0]
for idx, ctx in enumerate(contexts):
cc = ctx.todense().reshape([14 * 14, 512])
if zero_pad:
cc0 = numpy.zeros(
(cc.shape[0] + 1, cc.shape[1])).astype('float32')
cc0[:-1, :] = cc
else:
cc0 = cc
resp = gen_model(idx, cc0, model, options, k, normalize,
word_idict, sampling)
caps[resp[0]] = resp[1]
print 'Sample ', (idx + 1), '/', contexts.shape[0], ' Done'
print resp[1]
return caps
ds = datasets.strip().split(',')
# send all the features for the various datasets
for dd in ds:
if dd == 'train':
print 'Training Set...',
caps = _seqs2words(_process_examples(train[1]))
# import pdb; pdb.set_trace()
with open(saveto + '.train.txt', 'w') as f:
print >> f, '\n'.join(caps)
print 'Done'
if dd == 'dev':
print 'Development Set...',
caps = _seqs2words(_process_examples(valid[1]))
# import pdb; pdb.set_trace()
with open(saveto + '.dev.txt', 'w') as f:
print >> f, '\n'.join(caps)
print 'Done'
if dd == 'test':
print 'Test Set...',
caps = _seqs2words(_process_examples(test[1]))
with open(saveto + '.test.txt', 'w') as f:
print >> f, '\n'.join(caps)
print 'Done'
def main(pkl_names,
models,
split,
k=4,
normalize=False,
debug=False,
changes=None):
# load model model_options
f_init, f_next = [], []
for pkl_name, model in zip(pkl_names, models):
options = read_pkl(pkl_name)
if args.changes is not None:
for change in args.changes:
options[change.split('=')[0]] = change.split('=')[1]
# initialize the two functions
f1, f2 = gen_model(model, options)
f_init.append(f1)
f_next.append(f2)
# fetch data, skip ones we aren't using to save time
load_data, _ = get_dataset(options['dataset'])
kwargs = {
'path': osp.join(options['prefix'], options['dataset']),
'load_%s' % split: True,
'options': options
}
eval_data, worddict = load_data(**kwargs)
imgid = collapse([elem[-1] for elem in eval_data[0]])
word_idict = {vv: kk for kk, vv in worddict.iteritems()}
# write results to json format
caps = process_examples(f_init,
f_next,
imgid,
eval_data[1],
eval_data[2],
word_idict,
options,
k,
normalize,
debug=debug)
# create folder if not exist
if len(pkl_names) > 1:
folder = osp.join('../output',
'%s_ensemble_%s' % (options['dataset'], split))
else:
folder = osp.join('../output',
'%s_%s' % (osp.splitext(pkl_names[0])[0], split))
# If there exists more, then create mirrows
if not osp.exists(folder):
os.mkdir(folder)
elif osp.exists(folder) and split == 'test':
for i in range(2, 5):
if not osp.exists('%s.%d' % (folder, i)):
folder = '%s.%d' % (folder, i)
os.mkdir(folder)
break
# write json to the file
with open(osp.join(folder, 'captions_val2014_results.json'), 'w') as f:
json.dump(caps, f)
if split in ('val', 'test'):
# Evaluate using the official api
coco_caption_folder = osp.join('../', 'coco-caption')
assert osp.exists(coco_caption_folder)
sys.path.append(coco_caption_folder)
from cocoEvaluation import cocoEvaluation
evaluator = cocoEvaluation(options['dataset'])
evaluator.evaluate(folder)
def main(model, saveto, k=1, normalize=False, zero_pad=False, datasets='dev,test', data_path='./', sampling=False, pkl_name=None):
# load model model_options
if pkl_name is None:
pkl_name = model
with open('%s.pkl'% pkl_name, 'rb') as f:
options = pkl.load(f)
# fetch data, skip ones we aren't using to save time
load_data, prepare_data = get_dataset(options['dataset'])
_, valid, test, worddict = load_data(load_train=False, load_dev=True if 'dev' in datasets else False,
load_test=True if 'test' in datasets else False, path=data_path)
# <eos> means end of sequence (aka periods), UNK means unknown
word_idict = dict()
for kk, vv in worddict.iteritems():
word_idict[vv] = kk
word_idict[0] = '<eos>'
word_idict[1] = 'UNK'
# build sampler
trng = RandomStreams(1234)
# this is zero indicate we are not using dropout in the graph
use_noise = theano.shared(numpy.float32(0.), name='use_noise')
# get the parameters
params = init_params(options)
params = load_params(model, params)
tparams = init_tparams(params)
# build the sampling computational graph
# see capgen.py for more detailed explanations
f_init, f_next = build_sampler(tparams, options, use_noise, trng, sampling=sampling)
# index -> words
def _seqs2words(cc):
ww = []
for w in cc:
if w == 0:
break
ww.append(word_idict[w])
return ' '.join(ww)
# unsparsify, reshape, and queue
def _send_job(context):
cc = context.todense().reshape([14*14,512])
if zero_pad:
cc0 = numpy.zeros((cc.shape[0]+1, cc.shape[1])).astype('float32')
cc0[:-1,:] = cc
else:
cc0 = cc
return create_sample(tparams, f_init, f_next, cc0, options, trng, k, normalize)
ds = datasets.strip().split(',')
# send all the features for the various datasets
for dd in ds:
if dd == 'dev':
bar = Bar('Development Set...', max=len(valid[1]))
caps = []
for i in range(len(valid[1])):
sample = _send_job(valid[1][i])
cap = _seqs2words(sample)
caps.append(cap)
with open(saveto+'_status.json', 'w') as f:
json.dump({'current': i, 'total': len(valid[1])}, f)
bar.next()
bar.finish()
with open(saveto, 'w') as f:
print >>f, '\n'.join(caps)
print 'Done'
if dd == 'test':
print 'Test Set...',
caps = []
for i in range(len(test[1])):
sample = _send_job(test[1][i])
cap = _seqs2words(sample)
caps.append(cap)
with open(saveto+'_status.json', 'w') as f:
json.dump({'current': i, 'total': len(test[1])}, f)
bar.next()
bar.finish()
with open(saveto, 'w') as f:
print >>f, '\n'.join(caps)
print 'Done'
def main(model, saveto, k=5, normalize=False, zero_pad=False, n_process=5, datasets='dev,test', sampling=False, pkl_name=None):
# load model model_options
if pkl_name is None:
pkl_name = model
with open('%s.pkl'% pkl_name, 'rb') as f:
options = pkl.load(f)
# fetch data, skip ones we aren't using to save time
load_data, prepare_data = get_dataset(options['dataset'])
_, valid, test, worddict = load_data(load_train=False, load_dev=True if 'dev' in datasets else False,
load_test=True if 'test' in datasets else False)
# <eos> means end of sequence (aka periods), UNK means unknown
word_idict = dict()
for kk, vv in worddict.iteritems():
word_idict[vv] = kk
word_idict[0] = '<eos>'
word_idict[1] = 'UNK'
ipdb.set_trace()
# create processes
queue = Queue()
rqueue = Queue()
processes = [None] * n_process
for midx in xrange(n_process):
processes[midx] = Process(target=gen_model,
args=(queue,rqueue,midx,model,options,k,normalize,word_idict, sampling))
processes[midx].start()
# index -> words
def _seqs2words(caps):
capsw = []
for cc in caps:
ww = []
for w in cc:
if w == 0:
break
ww.append(word_idict[w])
capsw.append(' '.join(ww))
return capsw
# unsparsify, reshape, and queue
def _send_jobs(contexts):
for idx, ctx in enumerate(contexts):
cc = ctx.todense().reshape([14*14,512])
if zero_pad:
cc0 = numpy.zeros((cc.shape[0]+1, cc.shape[1])).astype('float32')
cc0[:-1,:] = cc
else:
cc0 = cc
queue.put((idx, cc0))
# retrieve caption from process
def _retrieve_jobs(n_samples):
caps = [None] * n_samples
for idx in xrange(n_samples):
resp = rqueue.get()
caps[resp[0]] = resp[1]
if numpy.mod(idx, 10) == 0:
print 'Sample ', (idx+1), '/', n_samples, ' Done'
return caps
ds = datasets.strip().split(',')
# send all the features for the various datasets
for dd in ds:
if dd == 'dev':
print 'Development Set...',
_send_jobs(valid[1])
vvv = valid[1].toarray()
caps = _seqs2words(_retrieve_jobs(len(vvv)))
print caps
with open(saveto+'.dev.txt', 'w') as f:
print >>f, '\n'.join(caps)
print 'Done'
if dd == 'test':
print 'Test Set...',
_send_jobs(test[1])
vvv = test[1].toarray()
caps = _seqs2words(_retrieve_jobs(len(vvv)))
print caps
with open(saveto+'.test.txt', 'w') as f:
print >>f, '\n'.join(caps)
print 'Done'
# end processes
for midx in xrange(n_process):
queue.put(None)
def train(dim_word=100, # word vector dimensionality
ctx_dim=512, # context vector dimensionality
dim=1000, # the number of LSTM units
attn_type='deterministic', # [see section 4 from paper]
n_layers_att=1, # number of layers used to compute the attention weights
n_layers_out=1, # number of layers used to compute logit
n_layers_lstm=1, # number of lstm layers
n_layers_init=1, # number of layers to initialize LSTM at time 0
lstm_encoder=False, # if True, run bidirectional LSTM on input units
prev2out=False, # Feed previous word into logit
ctx2out=False, # Feed attention weighted ctx into logit
alpha_entropy_c=0.002, # hard attn param
RL_sumCost=False, # hard attn param
semi_sampling_p=0.5, # hard attn param
temperature=1., # hard attn param
patience=10,
max_epochs=5000,
dispFreq=100,
decay_c=0., # weight decay coeff
alpha_c=0., # doubly stochastic coeff
lrate=0.01, # used only for SGD
selector=False, # selector (see paper)
n_words=10000, # vocab size
maxlen=100, # maximum length of the description
optimizer='rmsprop',
batch_size = 16,
valid_batch_size = 2,#change from 16
saveto='model.npz', # relative path of saved model file
validFreq=1000,
saveFreq=1000, # save the parameters after every saveFreq updates
sampleFreq=5, # generate some samples after every sampleFreq updates
data_path='./data', # path to find data
dataset='flickr30k',
dictionary=None, # word dictionary
use_dropout=False, # setting this true turns on dropout at various points
use_dropout_lstm=False, # dropout on lstm gates
reload_=False,
save_per_epoch=False): # this saves down the model every epoch
# hyperparam dict
model_options = locals().copy()
model_options = validate_options(model_options)
# reload options
if reload_ and os.path.exists(saveto):
print "Reloading options"
with open('%s.pkl'%saveto, 'rb') as f:
model_options = pkl.load(f)
print "Using the following parameters:"
print model_options
print 'Loading data'
load_data, prepare_data = get_dataset(dataset)
train, valid, test, worddict = load_data(path=data_path)
# index 0 and 1 always code for the end of sentence and unknown token
word_idict = dict()
for kk, vv in worddict.iteritems():
word_idict[vv] = kk
word_idict[0] = '<eos>'
word_idict[1] = 'UNK'
# Initialize (or reload) the parameters using 'model_options'
# then build the Theano graph
print 'Building model'
params = init_params(model_options)
if reload_ and os.path.exists(saveto):
print "Reloading model"
params = load_params(saveto, params)
# numpy arrays -> theano shared variables
tparams = init_tparams(params)
# In order, we get:
# 1) trng - theano random number generator
# 2) use_noise - flag that turns on dropout
# 3) inps - inputs for f_grad_shared
# 4) cost - log likelihood for each sentence
# 5) opts_out - optional outputs (e.g selector)
trng, use_noise, \
inps, alphas, alphas_sample,\
cost, \
opt_outs = \
build_model(tparams, model_options)
# To sample, we use beam search: 1) f_init is a function that initializes
# the LSTM at time 0 [see top right of page 4], 2) f_next returns the distribution over
# words and also the new "initial state/memory" see equation
print 'Building sampler'
f_init, f_next = build_sampler(tparams, model_options, use_noise, trng)
# we want the cost without any the regularizers
# define the log probability
f_log_probs = theano.function(inps, -cost, profile=False,
updates=opt_outs['attn_updates']
if model_options['attn_type']=='stochastic'
else None, allow_input_downcast=True)
# Define the cost function + Regularization
cost = cost.mean()
# add L2 regularization costs
if decay_c > 0.:
decay_c = theano.shared(numpy.float32(decay_c), name='decay_c')
weight_decay = 0.
for kk, vv in tparams.iteritems():
weight_decay += (vv ** 2).sum()
weight_decay *= decay_c
cost += weight_decay
# Doubly stochastic regularization
if alpha_c > 0.:
alpha_c = theano.shared(numpy.float32(alpha_c), name='alpha_c')
alpha_reg = alpha_c * ((1.-alphas.sum(0))**2).sum(0).mean()
cost += alpha_reg
hard_attn_updates = []
# Backprop!
if model_options['attn_type'] == 'deterministic':
grads = tensor.grad(cost, wrt=itemlist(tparams))
else:
# shared variables for hard attention
baseline_time = theano.shared(numpy.float32(0.), name='baseline_time')
opt_outs['baseline_time'] = baseline_time
alpha_entropy_c = theano.shared(numpy.float32(alpha_entropy_c), name='alpha_entropy_c')
alpha_entropy_reg = alpha_entropy_c * (alphas*tensor.log(alphas)).mean()
# [see Section 4.1: Stochastic "Hard" Attention for derivation of this learning rule]
if model_options['RL_sumCost']:
grads = tensor.grad(cost, wrt=itemlist(tparams),
disconnected_inputs='raise',
known_grads={alphas:(baseline_time-opt_outs['masked_cost'].mean(0))[None,:,None]/10.*
(-alphas_sample/alphas) + alpha_entropy_c*(tensor.log(alphas) + 1)})
else:
grads = tensor.grad(cost, wrt=itemlist(tparams),
disconnected_inputs='raise',
known_grads={alphas:opt_outs['masked_cost'][:,:,None]/10.*
(alphas_sample/alphas) + alpha_entropy_c*(tensor.log(alphas) + 1)})
# [equation on bottom left of page 5]
hard_attn_updates += [(baseline_time, baseline_time * 0.9 + 0.1 * opt_outs['masked_cost'].mean())]
# updates from scan
hard_attn_updates += opt_outs['attn_updates']
# to getthe cost after regularization or the gradients, use this
# f_cost = theano.function([x, mask, ctx], cost, profile=False)
# f_grad = theano.function([x, mask, ctx], grads, profile=False)
# f_grad_shared computes the cost and updates adaptive learning rate variables
# f_update updates the weights of the model
lr = tensor.scalar(name='lr')
f_grad_shared, f_update = eval(optimizer)(lr, tparams, grads, inps, cost, hard_attn_updates)
print 'Optimization'
# [See note in section 4.3 of paper]
train_iter = HomogeneousData(train, batch_size=batch_size, maxlen=maxlen)
if valid:
kf_valid = KFold(len(valid[0]), n_folds=len(valid[0])/valid_batch_size, shuffle=False)
if test:
kf_test = KFold(len(test[0]), n_folds=len(test[0])/valid_batch_size, shuffle=False)
# history_errs is a bare-bones training log that holds the validation and test error
history_errs = []
# reload history
if reload_ and os.path.exists(saveto):
history_errs = numpy.load(saveto)['history_errs'].tolist()
best_p = None
bad_counter = 0
if validFreq == -1:
validFreq = len(train[0])/batch_size
if saveFreq == -1:
saveFreq = len(train[0])/batch_size
if sampleFreq == -1:
sampleFreq = len(train[0])/batch_size
uidx = 0
estop = False
for eidx in xrange(max_epochs):
n_samples = 0
print 'Epoch ', eidx
for caps in train_iter:
n_samples += len(caps)
uidx += 1
# turn on dropout
use_noise.set_value(1.)
# preprocess the caption, recording the
# time spent to help detect bottlenecks
pd_start = time.time()
x, mask, ctx = prepare_data(caps,
train[1],
worddict,
maxlen=maxlen,
n_words=n_words)
pd_duration = time.time() - pd_start
if x is None:
print 'Minibatch with zero sample under length ', maxlen
continue
# get the cost for the minibatch, and update the weights
ud_start = time.time()
cost = f_grad_shared(x, mask, ctx)
f_update(lrate)
ud_duration = time.time() - ud_start # some monitoring for each mini-batch
# Numerical stability check
if numpy.isnan(cost) or numpy.isinf(cost):
print 'NaN detected'
return 1., 1., 1.
if numpy.mod(uidx, dispFreq) == 0:
print 'Epoch ', eidx, 'Update ', uidx, 'Cost ', cost, 'PD ', pd_duration, 'UD ', ud_duration
# Checkpoint
if numpy.mod(uidx, saveFreq) == 0:
print 'Saving...',
if best_p is not None:
params = copy.copy(best_p)
else:
params = unzip(tparams)
numpy.savez(saveto, history_errs=history_errs, **params)
pkl.dump(model_options, open('%s.pkl'%saveto, 'wb'))
print 'Done'
# Print a generated sample as a sanity check
if numpy.mod(uidx, sampleFreq) == 0:
# turn off dropout first
use_noise.set_value(0.)
x_s = x
mask_s = mask
ctx_s = ctx
# generate and decode the a subset of the current training batch
for jj in xrange(numpy.minimum(10, len(caps))):
sample, score = gen_sample(tparams, f_init, f_next, ctx_s[jj], model_options,
trng=trng, k=5, maxlen=30, stochastic=False)
# Decode the sample from encoding back to words
print 'Truth ',jj,': ',
for vv in x_s[:,jj]:
if vv == 0:
break
if vv in word_idict:
print word_idict[vv],
else:
print 'UNK',
print
for kk, ss in enumerate([sample[0]]):
print 'Sample (', kk,') ', jj, ': ',
for vv in ss:
if vv == 0:
break
if vv in word_idict:
print word_idict[vv],
else:
print 'UNK',
print
# Log validation loss + checkpoint the model with the best validation log likelihood
if numpy.mod(uidx, validFreq) == 0:
use_noise.set_value(0.)
train_err = 0
valid_err = 0
test_err = 0
if valid:
valid_err = -pred_probs(f_log_probs, model_options, worddict, prepare_data, valid, kf_valid).mean()
if test:
test_err = -pred_probs(f_log_probs, model_options, worddict, prepare_data, test, kf_test).mean()
history_errs.append([valid_err, test_err])
# the model with the best validation long likelihood is saved seperately with a different name
if uidx == 0 or valid_err <= numpy.array(history_errs)[:,0].min():
best_p = unzip(tparams)
print 'Saving model with best validation ll'
params = copy.copy(best_p)
params = unzip(tparams)
numpy.savez(saveto+'_bestll', history_errs=history_errs, **params)
bad_counter = 0
# abort training if perplexity has been increasing for too long
if eidx > patience and len(history_errs) > patience and valid_err >= numpy.array(history_errs)[:-patience,0].min():
bad_counter += 1
if bad_counter > patience:
print 'Early Stop!'
estop = True
break
print 'Train ', train_err, 'Valid ', valid_err, 'Test ', test_err
print 'Seen %d samples' % n_samples
if estop:
break
if save_per_epoch:
numpy.savez(saveto + '_epoch_' + str(eidx + 1), history_errs=history_errs, **unzip(tparams))
# use the best nll parameters for final checkpoint (if they exist)
if best_p is not None:
zipp(best_p, tparams)
use_noise.set_value(0.)
train_err = 0
valid_err = 0
test_err = 0
if valid:
valid_err = -pred_probs(f_log_probs, model_options, worddict, prepare_data, valid, kf_valid)
if test:
test_err = -pred_probs(f_log_probs, model_options, worddict, prepare_data, test, kf_test)
print 'Train ', train_err, 'Valid ', valid_err, 'Test ', test_err
params = copy.copy(best_p)
numpy.savez(saveto, zipped_params=best_p, train_err=train_err,
valid_err=valid_err, test_err=test_err, history_errs=history_errs,
**params)
return train_err, valid_err, test_err
def main(model, saveto, k=5, normalize=False, zero_pad=False, datasets='dev,test', sampling=False, pkl_name=None):
# load model model_options
if pkl_name is None:
pkl_name = model
with open('%s.pkl'% pkl_name, 'rb') as f:
options = pkl.load(f)
# fetch data, skip ones we aren't using to save time
load_data, prepare_data = get_dataset(options['dataset'])
train, valid, test, worddict = load_data(path='./data/flickr8k/', load_train=True if 'train' in datasets else False,
load_dev=True if 'dev' in datasets else False,
load_test=True if 'test' in datasets else False)
import pdb; pdb.set_trace()
# <eos> means end of sequence (aka periods), UNK means unknown
word_idict = dict()
for kk, vv in worddict.iteritems():
word_idict[vv] = kk
word_idict[0] = '<eos>'
word_idict[1] = 'UNK'
# index -> words
def _seqs2words(caps):
capsw = []
for cc in caps:
ww = []
for w in cc:
if w == 0:
break
ww.append(word_idict[w])
capsw.append(' '.join(ww))
return capsw
# process all dev examples
def _process_examples(contexts):
caps = [None] * contexts.shape[0]
for idx, ctx in enumerate(contexts):
cc = ctx.todense().reshape([14*14,512])
if zero_pad:
cc0 = numpy.zeros((cc.shape[0]+1, cc.shape[1])).astype('float32')
cc0[:-1,:] = cc
else:
cc0 = cc
resp = gen_model(idx, cc0, model, options, k, normalize, word_idict, sampling)
caps[resp[0]] = resp[1]
print 'Sample ', (idx+1), '/', contexts.shape[0], ' Done'
print resp[1]
return caps
ds = datasets.strip().split(',')
# send all the features for the various datasets
for dd in ds:
if dd == 'train':
print 'Training Set...',
caps = _seqs2words(_process_examples(train[1]))
import pdb; pdb.set_trace()
with open(saveto+'.train.txt', 'w') as f:
print >>f, '\n'.join(caps)
print 'Done'
if dd == 'dev':
print 'Development Set...',
caps = _seqs2words(_process_examples(valid[1]))
import pdb; pdb.set_trace()
with open(saveto+'.dev.txt', 'w') as f:
print >>f, '\n'.join(caps)
print 'Done'
if dd == 'test':
print 'Test Set...',
caps = _seqs2words(_process_examples(test[1]))
with open(saveto+'.test.txt', 'w') as f:
print >>f, '\n'.join(caps)
print 'Done'
def main(model, saveto, k=5, normalize=False, zero_pad=False, datasets="dev,test", sampling=False, pkl_name=None):
# load model model_options
if pkl_name is None:
pkl_name = model
with open("%s.pkl" % pkl_name, "rb") as f:
options = pkl.load(f)
# fetch data, skip ones we aren't using to save time
load_data, prepare_data = get_dataset(options["dataset"])
train, valid, test, worddict = load_data(
path="./data/coco/",
load_train=True if "train" in datasets else False,
load_dev=True if "dev" in datasets else False,
load_test=True if "test" in datasets else False,
)
# import pdb; pdb.set_trace()
# <eos> means end of sequence (aka periods), UNK means unknown
word_idict = dict()
for kk, vv in worddict.iteritems():
word_idict[vv] = kk
word_idict[0] = "<eos>"
word_idict[1] = "UNK"
# index -> words
def _seqs2words(caps):
capsw = []
for cc in caps:
ww = []
for w in cc:
if w == 0:
break
ww.append(word_idict[w])
capsw.append(" ".join(ww))
return capsw
# process all dev examples
def _process_examples(contexts):
caps = [None] * contexts.shape[0]
for idx, ctx in enumerate(contexts):
cc = ctx.todense().reshape([14 * 14, 512])
if zero_pad:
cc0 = numpy.zeros((cc.shape[0] + 1, cc.shape[1])).astype("float32")
cc0[:-1, :] = cc
else:
cc0 = cc
resp = gen_model(idx, cc0, model, options, k, normalize, word_idict, sampling)
caps[resp[0]] = resp[1]
print "Sample ", (idx + 1), "/", contexts.shape[0], " Done"
print resp[1]
return caps
ds = datasets.strip().split(",")
# send all the features for the various datasets
for dd in ds:
if dd == "train":
print "Training Set...",
caps = _seqs2words(_process_examples(train[1]))
# import pdb; pdb.set_trace()
with open(saveto + ".train.txt", "w") as f:
print >> f, "\n".join(caps)
print "Done"
if dd == "dev":
print "Development Set...",
caps = _seqs2words(_process_examples(valid[1]))
# import pdb; pdb.set_trace()
with open(saveto + ".dev.txt", "w") as f:
print >> f, "\n".join(caps)
print "Done"
if dd == "test":
print "Test Set...",
caps = _seqs2words(_process_examples(test[1]))
with open(saveto + ".test.txt", "w") as f:
print >> f, "\n".join(caps)
print "Done"
def main(model, saveto, k=5, normalize=False, zero_pad=False, n_process=5, datasets='train,dev,test', sampling=False, pkl_name=None, cate_name = None, out_name = None):
lines = open(cate_name,'r').read().splitlines()
ref_images = []
weights = []
for line in lines:
s = line.split(',')
ref_images.append(s[0])
weights.append(int(s[1]))
# load model model_options
if pkl_name is None:
pkl_name = model[0]
with open('%s.pkl'% pkl_name, 'rb') as f:
options = pkl.load(f)
# fetch data, skip ones we aren't using to save time
load_data, prepare_data = get_dataset(options['dataset'])
train, valid, test, worddict = load_data(load_train=True if 'train' in datasets else False, load_dev=True if 'dev' in datasets else False,
load_test=True if 'test' in datasets else False)
# <eos> means end of sequence (aka periods), UNK means unknown
word_idict = dict()
for kk, vv in worddict.iteritems():
word_idict[vv] = kk
word_idict[0] = '<eos>'
word_idict[1] = 'UNK'
# create processes
queue = Queue()
rqueue = Queue()
processes = [None] * n_process
for midx in xrange(n_process):
processes[midx] = Process(target=gen_model,
args=(queue,rqueue,midx,model,options,k,normalize,word_idict, sampling))
processes[midx].start()
# index -> words
def _seqs2words(caps):
capsw = []
for cc in caps:
ww = []
for w in cc:
if w == 0:
break
ww.append(word_idict[w])
capsw.append(' '.join(ww))
return capsw
# unsparsify, reshape, and queue
def _send_jobs(contexts):
for idx, ctx in enumerate(contexts):
cc = ctx.todense().reshape([14*14,512])
if zero_pad:
cc0 = numpy.zeros((cc.shape[0]+1, cc.shape[1])).astype('float32')
cc0[:-1,:] = cc
else:
cc0 = cc
queue.put((idx, cc0))
return
# retrieve caption from process
def _retrieve_jobs(n_samples):
caps = [None] * n_samples
scores = [None] * n_samples
for idx in xrange(n_samples):
resp = rqueue.get()
caps[resp[0]] = resp[1]
scores[resp[0]] = resp[2]
if numpy.mod(idx, 10) == 0:
print 'Sample ', (idx+1), '/', n_samples, ' Done'
return caps, scores
ds = datasets.strip().split(',')
# send all the features for the various datasets
for dd in ds:
if dd == 'dev':
print 'Development Set...',
_send_jobs(valid[1])
print 'Finished sending DEV'
caps,scores = _retrieve_jobs(valid[1].shape[0])
caps = _seqs2words(caps)
print 'Finished Generationg DEV'
with open(saveto+'.dev.txt', 'w') as f:
print >>f, '\n'.join(caps)
with open(saveto+'.dev.scores.txt', 'w') as f:
for score in scores:
print >>f, str(score)+'\n'
with open(saveto+'.dev.info.txt', 'w') as f:
for idx in range(len(scores)):
print >>f, caps[idx] +'\n'+ ref_images[idx] +'\n'+ str(scores[idx]) +'\n'
# sents = []
# for sen in valid[0]:
# while len(sents) < sen[1]+1:
# sents.append([])
# sents[sen[1]].append(sen[0].strip())
# sents2 = zip(*sents)
# for idd in range(5):
# with open(saveto+'gold'+str(idd)+'.dev.txt', 'w') as f:
# print >>f, '\n'.join(sents2[idd])
print 'Done'
if dd == 'test':
print 'Test Set...',
_send_jobs(test[1])
print 'Finished sending TEST'
caps,scores = _retrieve_jobs(test[1].shape[0])
caps = _seqs2words(caps)
print 'Finished Generationg TEST'
with open(saveto+'.test.txt', 'w') as f:
print >>f, '\n'.join(caps)
with open(saveto+'.test.scores.txt', 'w') as f:
for score in scores:
print >>f, str(score)+'\n'
with open(saveto+'.test.info.txt', 'w') as f:
for idx in range(len(scores)):
print >>f, caps[idx] +'\n'+ ref_images[idx] +'\n'+ str(scores[idx]) +'\n'
# sents = []
# for sen in test[0]:
# while len(sents) < sen[1]+1:
# sents.append([])
# sents[sen[1]].append(sen[0].strip())
# sents2 = zip(*sents)
# for idd in range(5):
# with open(saveto+'gold'+str(idd)+'.test.txt', 'w') as f:
# print >>f, '\n'.join(sents2[idd])
print 'Done'
if dd == 'train':
print 'Train Set...',
_send_jobs(train[1])
print 'Finished sending TRAIN'
caps, scores = _retrieve_jobs(train[1].shape[0])
caps = _seqs2words(caps)
# all_caps,all_scores = _retrieve_jobs(train[1].shape[0])
# all_caps = _seqs2words(all_caps)
# caps = []
# scores = []
# index = 0
# for i in xrange(len(weights)):
# if weights[i] == 0:
# scores.append(0)
# else:
# caps.append(all_caps[index])
# scores.append(all_scores[index])
# index += weights[i]
print 'Finished Generationg TRAIN'
with open(saveto+'.train.txt', 'w') as f:
print >>f, '\n'.join(caps)
# with open(saveto+'.train.scores.txt', 'w') as f:
# for score in scores:
# print >>f, str(score)+'\n'
threshold = 1.0
avgScore = sum(scores) / float(len(scores))
totalWeight = float(sum(weights))
loss = 0;
with open(out_name, 'w') as f:
for i in range(len(scores)):
if scores[i] > threshold:
loss += float(weights[i]) / totalWeight
#modelWeight += float(weights[i])/totalWeight / scores[i]
if scores[i] > 1.2*avgScore and weights[i] <= 10:
weights[i] = weights[i]+1
if scores[i] < 0.5*avgScore and weights[i] > 0:
weights[i] = weights[i]-1
print >>f, ref_images[i]+','+str(weights[i])
modelWeight = 0.5 * numpy.log(1/loss - 1)
with open(cate_name[:-4]+'.info.txt', 'w') as f:
print >>f, 'ModelWeight:'+str(modelWeight)
for idx in range(len(scores)):
print >>f, caps[idx] +'\n'+ ref_images[idx] +'\n'+ str(scores[idx]) +'\n'
# sents = []
# for sen in test[0]:
# while len(sents) < sen[1]+1:
# sents.append([])
# sents[sen[1]].append(sen[0].strip())
# sents2 = zip(*sents)
# for idd in range(5):
# with open(saveto+'gold'+str(idd)+'.test.txt', 'w') as f:
# print >>f, '\n'.join(sents2[idd])
print 'Done'
# end processes
for midx in xrange(n_process):
queue.put(None)
return
def main(model,
saveto,
k=5,
normalize=False,
zero_pad=False,
n_process=5,
datasets='train,dev,test',
sampling=False,
pkl_name=None,
cate_name=None,
out_name=None):
lines = open(cate_name, 'r').read().splitlines()
ref_images = []
weights = []
for line in lines:
s = line.split(',')
ref_images.append(s[0])
weights.append(int(s[1]))
# load model model_options
if pkl_name is None:
pkl_name = model[0]
with open('%s.pkl' % pkl_name, 'rb') as f:
options = pkl.load(f)
# fetch data, skip ones we aren't using to save time
load_data, prepare_data = get_dataset(options['dataset'])
train, valid, test, worddict = load_data(
load_train=True if 'train' in datasets else False,
load_dev=True if 'dev' in datasets else False,
load_test=True if 'test' in datasets else False)
# <eos> means end of sequence (aka periods), UNK means unknown
word_idict = dict()
for kk, vv in worddict.iteritems():
word_idict[vv] = kk
word_idict[0] = '<eos>'
word_idict[1] = 'UNK'
# create processes
queue = Queue()
rqueue = Queue()
processes = [None] * n_process
for midx in xrange(n_process):
processes[midx] = Process(target=gen_model,
args=(queue, rqueue, midx, model, options, k,
normalize, word_idict, sampling))
processes[midx].start()
# index -> words
def _seqs2words(caps):
capsw = []
for cc in caps:
ww = []
for w in cc:
if w == 0:
break
ww.append(word_idict[w])
capsw.append(' '.join(ww))
return capsw
# unsparsify, reshape, and queue
def _send_jobs(contexts):
for idx, ctx in enumerate(contexts):
cc = ctx.todense().reshape([14 * 14, 512])
if zero_pad:
cc0 = numpy.zeros(
(cc.shape[0] + 1, cc.shape[1])).astype('float32')
cc0[:-1, :] = cc
else:
cc0 = cc
queue.put((idx, cc0))
return
# retrieve caption from process
def _retrieve_jobs(n_samples):
caps = [None] * n_samples
scores = [None] * n_samples
for idx in xrange(n_samples):
resp = rqueue.get()
caps[resp[0]] = resp[1]
scores[resp[0]] = resp[2]
if numpy.mod(idx, 10) == 0:
print 'Sample ', (idx + 1), '/', n_samples, ' Done'
return caps, scores
ds = datasets.strip().split(',')
# send all the features for the various datasets
for dd in ds:
if dd == 'dev':
print 'Development Set...',
_send_jobs(valid[1])
print 'Finished sending DEV'
caps, scores = _retrieve_jobs(valid[1].shape[0])
caps = _seqs2words(caps)
print 'Finished Generationg DEV'
with open(saveto + '.dev.txt', 'w') as f:
print >> f, '\n'.join(caps)
with open(saveto + '.dev.scores.txt', 'w') as f:
for score in scores:
print >> f, str(score) + '\n'
with open(saveto + '.dev.info.txt', 'w') as f:
for idx in range(len(scores)):
print >> f, caps[idx] + '\n' + ref_images[
idx] + '\n' + str(scores[idx]) + '\n'
# sents = []
# for sen in valid[0]:
# while len(sents) < sen[1]+1:
# sents.append([])
# sents[sen[1]].append(sen[0].strip())
# sents2 = zip(*sents)
# for idd in range(5):
# with open(saveto+'gold'+str(idd)+'.dev.txt', 'w') as f:
# print >>f, '\n'.join(sents2[idd])
print 'Done'
if dd == 'test':
print 'Test Set...',
_send_jobs(test[1])
print 'Finished sending TEST'
caps, scores = _retrieve_jobs(test[1].shape[0])
caps = _seqs2words(caps)
print 'Finished Generationg TEST'
with open(saveto + '.test.txt', 'w') as f:
print >> f, '\n'.join(caps)
with open(saveto + '.test.scores.txt', 'w') as f:
for score in scores:
print >> f, str(score) + '\n'
with open(saveto + '.test.info.txt', 'w') as f:
for idx in range(len(scores)):
print >> f, caps[idx] + '\n' + ref_images[
idx] + '\n' + str(scores[idx]) + '\n'
# sents = []
# for sen in test[0]:
# while len(sents) < sen[1]+1:
# sents.append([])
# sents[sen[1]].append(sen[0].strip())
# sents2 = zip(*sents)
# for idd in range(5):
# with open(saveto+'gold'+str(idd)+'.test.txt', 'w') as f:
# print >>f, '\n'.join(sents2[idd])
print 'Done'
if dd == 'train':
print 'Train Set...',
_send_jobs(train[1])
print 'Finished sending TRAIN'
caps, scores = _retrieve_jobs(train[1].shape[0])
caps = _seqs2words(caps)
# all_caps,all_scores = _retrieve_jobs(train[1].shape[0])
# all_caps = _seqs2words(all_caps)
# caps = []
# scores = []
# index = 0
# for i in xrange(len(weights)):
# if weights[i] == 0:
# scores.append(0)
# else:
# caps.append(all_caps[index])
# scores.append(all_scores[index])
# index += weights[i]
print 'Finished Generationg TRAIN'
with open(saveto + '.train.txt', 'w') as f:
print >> f, '\n'.join(caps)
# with open(saveto+'.train.scores.txt', 'w') as f:
# for score in scores:
# print >>f, str(score)+'\n'
threshold = 1.0
avgScore = sum(scores) / float(len(scores))
totalWeight = float(sum(weights))
loss = 0
with open(out_name, 'w') as f:
for i in range(len(scores)):
if scores[i] > threshold:
loss += float(weights[i]) / totalWeight
#modelWeight += float(weights[i])/totalWeight / scores[i]
if scores[i] > 1.2 * avgScore and weights[i] <= 10:
weights[i] = weights[i] + 1
if scores[i] < 0.5 * avgScore and weights[i] > 0:
weights[i] = weights[i] - 1
print >> f, ref_images[i] + ',' + str(weights[i])
modelWeight = 0.5 * numpy.log(1 / loss - 1)
with open(cate_name[:-4] + '.info.txt', 'w') as f:
print >> f, 'ModelWeight:' + str(modelWeight)
for idx in range(len(scores)):
print >> f, caps[idx] + '\n' + ref_images[
idx] + '\n' + str(scores[idx]) + '\n'
# sents = []
# for sen in test[0]:
# while len(sents) < sen[1]+1:
# sents.append([])
# sents[sen[1]].append(sen[0].strip())
# sents2 = zip(*sents)
# for idd in range(5):
# with open(saveto+'gold'+str(idd)+'.test.txt', 'w') as f:
# print >>f, '\n'.join(sents2[idd])
print 'Done'
# end processes
for midx in xrange(n_process):
queue.put(None)
return
def train(
dim_word=300, # word vector dimensionality
ctx_dim=300, # context vector dimensionality
semantic_dim=300,
dim=1000, # the number of LSTM units
cnn_dim=4096, # CNN feature dimension
n_layers_att=1, # number of layers used to compute the attention weights
n_layers_out=1, # number of layers used to compute logit
n_layers_lstm=1, # number of lstm layers
n_layers_init=1, # number of layers to initialize LSTM at time 0
lstm_encoder=True, # if True, run bidirectional LSTM on input units
prev2out=False, # Feed previous word into logit
ctx2out=False, # Feed attention weighted ctx into logit
cutoff=10,
patience=5,
max_epochs=30,
dispFreq=500,
decay_c=0., # weight decay coeff
alpha_c=0., # doubly stochastic coeff
lrate=1e-4, # used only for SGD
selector=False, # selector (see paper)
maxlen=30, # maximum length of the description
optimizer='rmsprop',
pretrained='',
batch_size=256,
saveto='model', # relative path of saved model file
saveFreq=1000, # save the parameters after every saveFreq updates
sampleFreq=100, # generate some samples after every sampleFreq updates
embedding='../Data/GloVe/vocab_glove.pkl',
cnn_type='vgg',
prefix='../Data', # path to find data
dataset='coco',
criterion='Bleu_4',
switch_test_val=False,
use_cnninit=True,
use_dropout=True, # setting this true turns on dropout at various points
use_dropout_lstm=False, # dropout on lstm gates
save_per_epoch=False): # this saves down the model every epoch
# hyperparam dict
model_options = locals().copy()
model_options = validate_options(model_options)
# reload options
if os.path.exists('%s.pkl' % saveto):
print "Reloading options"
with open('%s.pkl' % saveto, 'rb') as f:
model_options = pkl.load(f)
print "Using the following parameters:"
print model_options
print 'Loading data'
load_data, prepare_data = get_dataset(model_options['dataset'])
# Load data from data path
if 'switch_test_val' in model_options and model_options['switch_test_val']:
train, valid, worddict = load_data(path=osp.join(
model_options['prefix'], model_options['dataset']),
options=model_options,
load_train=True,
load_test=True)
else:
train, valid, worddict = load_data(path=osp.join(
model_options['prefix'], model_options['dataset']),
options=model_options,
load_train=True,
load_val=True)
# Automatically calculate the update frequency
validFreq = len(train[0]) / model_options['batch_size']
print "Validation frequency is %d" % validFreq
word_idict = {vv: kk for kk, vv in worddict.iteritems()}
model_options['n_words'] = len(worddict)
# Initialize (or reload) the parameters using 'model_options'
# then build the Theano graph
print 'Building model'
params = init_params(model_options)
# Initialize it with glove
if 'VCemb' in params:
params['VCemb'] = read_pkl(
model_options['embedding']).astype('float32')
# If there is a same experiment, don't use pretrained weights
if os.path.exists('%s.npz' % saveto):
print "Reloading model"
params = load_params('%s.npz' % saveto, params)
elif pretrained != '':
params = load_params(pretrained, params,
False) # Only pretrain the Language model
# numpy arrays -> theano shared variables
tparams = init_tparams(params)
# In order, we get:
# 1) trng - theano random number generator
# 2) use_noise - flag that turns on dropout
# 3) inps - inputs for f_grad_shared
# 4) cost - log likelihood for each sentence
# 5) opts_out - optional outputs (e.g selector)
trng, use_noise, \
inps, alphas,\
cost, \
opt_outs = \
build_model(tparams, model_options)
# Load evaluator to calculate bleu score
evaluator = cocoEvaluation(model_options['dataset'])
# To sample, we use beam search: 1) f_init is a function that initializes
# the LSTM at time 0 [see top right of page 4], 2) f_next returns the distribution over
# words and also the new "initial state/memory" see equation
print 'Building sampler'
f_init, f_next = build_sampler(tparams, model_options, use_noise, trng)
# we want the cost without any the regularizers
# define the log probability
f_log_probs = theano.function(inps,
-cost,
profile=False,
updates=None,
allow_input_downcast=True)
# Define the cost function + Regularization
cost = cost.mean()
# add L2 regularization costs
if decay_c > 0.:
decay_c = theano.shared(numpy.float32(decay_c), name='decay_c')
weight_decay = 0.
for kk, vv in tparams.iteritems():
weight_decay += (vv**2).sum()
weight_decay *= decay_c
cost += weight_decay
# Doubly stochastic regularization
if alpha_c > 0.:
alpha_c = theano.shared(numpy.float32(alpha_c), name='alpha_c')
alpha_reg = sum([
alpha_c * ((1. - alpha.sum(0))**2).sum(0).mean()
for alpha in alphas
])
cost += alpha_reg
# Backprop!
grads = tensor.grad(cost, wrt=itemlist(tparams))
# to getthe cost after regularization or the gradients, use this
# f_grad_shared computes the cost and updates adaptive learning rate variables
# f_update updates the weights of the model
lr = tensor.scalar(name='lr')
f_grad_shared, f_update = eval(model_options['optimizer'])(lr, tparams,
grads, inps,
cost)
print 'Optimization'
train_iter = HomogeneousData(train,
batch_size=batch_size,
maxlen=model_options['maxlen'])
# history_bleu is a bare-bones training log, reload history
history_bleu = []
if os.path.exists('%s.npz' % saveto):
history_bleu = numpy.load('%s.npz' % saveto)['history_bleu'].tolist()
start_epochs = len(history_bleu)
best_p = None
bad_counter = 0
if validFreq == -1:
validFreq = len(train[0]) / batch_size
if saveFreq == -1:
saveFreq = len(train[0]) / batch_size
if sampleFreq == -1:
sampleFreq = len(train[0]) / batch_size
uidx = 0
estop = False
for eidx in xrange(start_epochs, model_options['max_epochs']):
n_samples = 0
print 'Epoch ', eidx
for caps in train_iter:
n_samples += len(caps)
uidx += 1
# turn on dropout
use_noise.set_value(1.)
# preprocess the caption, recording the
# time spent to help detect bottlenecks
pd_start = time.time()
x, mask, ctx, cnn_feats = prepare_data(caps, train[1], train[2],
worddict, model_options)
pd_duration = time.time() - pd_start
if x is None:
print 'Minibatch with zero sample under length ', model_options[
'maxlen']
continue
# get the cost for the minibatch, and update the weights
ud_start = time.time()
cost = f_grad_shared(x, mask, ctx, cnn_feats)
print "Epoch %d, Updates: %d, Cost is: %f" % (eidx, uidx, cost)
f_update(model_options['lrate'])
ud_duration = time.time(
) - ud_start # some monitoring for each mini-batch
# Numerical stability check
if numpy.isnan(cost) or numpy.isinf(cost):
print 'NaN detected'
return 1., 1., 1.
if numpy.mod(uidx, dispFreq) == 0:
print 'Epoch ', eidx, 'Update ', uidx, 'Cost ', cost, 'PD ', pd_duration, 'UD ', ud_duration
# Print a generated sample as a sanity check
if numpy.mod(uidx, model_options['sampleFreq']) == 0:
# turn off dropout first
use_noise.set_value(0.)
x_s = x
mask_s = mask
ctx_s = ctx
# generate and decode the a subset of the current training batch
for jj in xrange(numpy.minimum(10, len(caps))):
sample, score, alphas = gen_sample(
f_init,
f_next,
ctx_s[jj],
cnn_feats[jj],
model_options,
trng=trng,
maxlen=model_options['maxlen'])
# Decode the sample from encoding back to words
print 'Truth ', jj, ': ',
print seqs2words(x_s[:, jj], word_idict)
for kk, ss in enumerate([sample[0]]):
print 'Sample (', kk, ') ', jj, ': ',
print seqs2words(ss, word_idict)
# Log validation loss + checkpoint the model with the best validation log likelihood
if numpy.mod(uidx, validFreq) == 0:
use_noise.set_value(0.)
# Do evaluation on validation set
imgid = collapse([elem[-1] for elem in valid[0]])
caps = process_examples([f_init], [f_next], imgid, valid[1],
valid[2], word_idict, model_options)
folder = osp.join('../output', '%s_%s' % (saveto, 'val'))
if not osp.exists(folder):
os.mkdir(folder)
with open(osp.join(folder, 'captions_val2014_results.json'),
'w') as f:
json.dump(caps, f)
eva_result = evaluator.evaluate(folder, False)
if model_options['criterion'] == 'combine':
history_bleu.append(eva_result['Bleu_4'] +
eva_result['CIDEr'])
else:
history_bleu.append(eva_result[model_options['criterion']])
# the model with the best validation long likelihood is saved seperately with a different name
if uidx == 0 or history_bleu[-1] == max(history_bleu):
best_p = unzip(tparams)
print 'Saving model with best validation ll'
params = copy.copy(best_p)
params = unzip(tparams)
numpy.savez(saveto + '_bestll',
history_bleu=history_bleu,
**params)
bad_counter = 0
# abort training if perplexity has been increasing for too long
if len(history_bleu) > model_options[
'patience'] and history_bleu[-1] <= max(
history_bleu[:-model_options['patience']]):
bad_counter += 1
if bad_counter > model_options['patience']:
print 'Early Stop!'
estop = True
break
print ' BLEU-4 score ', history_bleu[-1]
# Checkpoint
if numpy.mod(uidx, model_options['saveFreq']) == 0:
print 'Saving...',
if best_p is not None:
params = copy.copy(best_p)
else:
params = unzip(tparams)
numpy.savez(saveto, history_bleu=history_bleu, **params)
pkl.dump(model_options, open('%s.pkl' % saveto, 'wb'))
print 'Done'
print 'Seen %d samples' % n_samples
if estop:
break
if model_options['save_per_epoch']:
numpy.savez(saveto + '_epoch_' + str(eidx + 1),
history_bleu=history_bleu,
**unzip(tparams))
# use the best nll parameters for final checkpoint (if they exist)
if best_p is not None:
zipp(best_p, tparams)
params = copy.copy(best_p)
numpy.savez(saveto,
zipped_params=best_p,
history_bleu=history_bleu,
**params)