def __init__(self):
# layers: 'name': ('parameter initializer', 'feedforward')
self.layers = {
'ff': ('self.param_init_fflayer', 'self.fflayer'),
'lstm': ('self.param_init_lstm', 'self.lstm_layer'),
'lstm_cond': ('self.param_init_lstm_cond', 'self.lstm_cond_layer'),
}
self.rng_numpy, self.rng_theano = get_two_rngs()
def __init__(self, state, data_engine, channel):
print 'Init ', self.__class__
self.random_seed = state.random_seed
self.rng_numpy, self.rng_theano = utils.get_two_rngs(
seed=self.random_seed)
self.state = state
self.data_engine = data_engine
self.save_model_path = state.save_model_path
self.channel = channel
config_model = state.DeepOrderlessNADE
self.n_visible = config_model.n_in
self.n_hidden = config_model.n_hidden
# number of hidden layers besides the first and last
self.n_layers = config_model.n_layers
self.hidden_act = config_model.hidden_act
self.tied_weights = config_model.tied_weights
self.use_mask = config_model.use_mask
self.init_mean_field = config_model.init_mean_field
self.cost_from_last = config_model.cost_from_last
self.init_weights = config_model.init_weights
self.center_v = config_model.center_v
config_train = state.DeepOrderlessNADE.train
self.valid_freq = config_train.valid_freq
self.n_orderings = config_train.n_orderings
self.sgd_type = config_train.sgd_type
self.n_epochs = config_train.n_epochs
self.minibatch_size = config_train.minibatch_size
self.momentum = config_train.momentum
self.lr = config_train.lr
self.l2 = config_train.l2
# number of variationa inference to do
self.k = self.state.DeepOrderlessNADE.train.k
self.verbose = config_train.verbose
self.fine_tune_n_epochs = config_train.fine_tune.n_epochs
self.fine_tune_activate = config_train.fine_tune.activate
assert self.n_layers >= 1
# used in training, save also to txt file.
self.LL_valid_test = []
# for dataset
self.trainset, _, self.validset, _, self.testset, _ = utils.load_mnist(
)
self.marginal = numpy.mean(numpy.concatenate(
[self.trainset, self.validset], axis=0),
axis=0)
# for tracking the costs for both pretrain and finetune
self.costs = []
self.costs_steps = []
# decrease learning rate
self.lr_decrease = self.lr / self.n_epochs
def train(
random_seed=1234,
dim_word=256, # word vector dimensionality
ctx_dim=-1, # context vector dimensionality, auto set
dim=1000, # the number of LSTM units
n_layers_out=1,
n_layers_init=1,
encoder='none',
encoder_dim=100,
prev2out=False,
ctx2out=False,
patience=10,
max_epochs=5000,
dispFreq=100,
decay_c=0.,
alpha_c=0.,
alpha_entropy_r=0.,
lrate=0.01,
selector=False,
n_words=100000,
maxlen=100, # maximum length of the description
optimizer='adadelta',
clip_c=2.,
batch_size=64,
valid_batch_size=64,
save_model_dir='/data/lisatmp3/yaoli/exp/capgen_vid/attention/test/',
validFreq=10,
saveFreq=10, # save the parameters after every saveFreq updates
sampleFreq=10, # generate some samples after every sampleFreq updates
metric='blue',
dataset='youtube2text',
video_feature='googlenet',
use_dropout=False,
reload_=False,
from_dir=None,
K=10,
OutOf=240,
verbose=True,
debug=True):
rng_numpy, rng_theano = utils.get_two_rngs()
model_options = locals().copy()
if 'self' in model_options:
del model_options['self']
with open('%smodel_options.pkl' % save_model_dir, 'wb') as f:
pkl.dump(model_options, f)
# instance model
layers = Layers()
model = Model()
print 'Loading data'
engine = data_engine.Movie2Caption('attention', dataset, video_feature,
batch_size, valid_batch_size, maxlen,
n_words, K, OutOf)
model_options['ctx_dim'] = engine.ctx_dim
model_options['n_words'] = engine.n_words
print 'n_words:', model_options['n_words']
# set test values, for debugging
idx = engine.kf_train[0]
[x_tv, mask_tv, ctx_tv, ctx_mask_tv
] = data_engine.prepare_data(engine,
[engine.train[index] for index in idx])
print 'init params'
t0 = time.time()
params = model.init_params(model_options)
# reloading
if reload_:
model_saved = from_dir + '/model_best_so_far.npz'
assert os.path.isfile(model_saved)
print "Reloading model params..."
params = utils.load_params(model_saved, params)
tparams = utils.init_tparams(params)
trng, use_noise, \
x, mask, ctx, mask_ctx, \
cost, extra = \
model.build_model(tparams, model_options)
alphas = extra[1]
betas = extra[2]
print 'buliding sampler'
f_init, f_next = model.build_sampler(tparams, model_options, use_noise,
trng)
# before any regularizer
print 'building f_log_probs'
f_log_probs = theano.function([x, mask, ctx, mask_ctx],
-cost,
profile=False,
on_unused_input='ignore')
cost = cost.mean()
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
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(-1).mean()
cost += alpha_reg
if alpha_entropy_r > 0:
alpha_entropy_r = theano.shared(numpy.float32(alpha_entropy_r),
name='alpha_entropy_r')
alpha_reg_2 = alpha_entropy_r * (-tensor.sum(
alphas * tensor.log(alphas + 1e-8), axis=-1)).sum(-1).mean()
cost += alpha_reg_2
else:
alpha_reg_2 = tensor.zeros_like(cost)
print 'building f_alpha'
f_alpha = theano.function([x, mask, ctx, mask_ctx], [alphas, betas],
name='f_alpha',
on_unused_input='ignore')
print 'compute grad'
grads = tensor.grad(cost, wrt=utils.itemlist(tparams))
if clip_c > 0.:
g2 = 0.
for g in grads:
g2 += (g**2).sum()
new_grads = []
for g in grads:
new_grads.append(
tensor.switch(g2 > (clip_c**2), g / tensor.sqrt(g2) * clip_c,
g))
grads = new_grads
lr = tensor.scalar(name='lr')
print 'build train fns'
f_grad_shared, f_update = eval(optimizer)(lr, tparams, grads,
[x, mask, ctx, mask_ctx], cost,
extra + grads)
print 'compilation took %.4f sec' % (time.time() - t0)
print 'Optimization'
history_errs = []
# reload history
if reload_:
print 'loading history error...'
history_errs = numpy.load(
from_dir + 'model_best_so_far.npz')['history_errs'].tolist()
bad_counter = 0
processes = None
queue = None
rqueue = None
shared_params = None
uidx = 0
uidx_best_blue = 0
uidx_best_valid_err = 0
estop = False
best_p = utils.unzip(tparams)
best_blue_valid = 0
best_valid_err = 999
alphas_ratio = []
for eidx in xrange(max_epochs):
n_samples = 0
train_costs = []
grads_record = []
print 'Epoch ', eidx
for idx in engine.kf_train:
tags = [engine.train[index] for index in idx]
n_samples += len(tags)
uidx += 1
use_noise.set_value(1.)
pd_start = time.time()
x, mask, ctx, ctx_mask = data_engine.prepare_data(engine, tags)
pd_duration = time.time() - pd_start
if x is None:
print 'Minibatch with zero sample under length ', maxlen
continue
ud_start = time.time()
rvals = f_grad_shared(x, mask, ctx, ctx_mask)
cost = rvals[0]
probs = rvals[1]
alphas = rvals[2]
betas = rvals[3]
grads = rvals[4:]
grads, NaN_keys = utils.grad_nan_report(grads, tparams)
if len(grads_record) >= 5:
del grads_record[0]
grads_record.append(grads)
if NaN_keys != []:
print 'grads contain NaN'
import pdb
pdb.set_trace()
if numpy.isnan(cost) or numpy.isinf(cost):
print 'NaN detected in cost'
import pdb
pdb.set_trace()
# update params
f_update(lrate)
ud_duration = time.time() - ud_start
if eidx == 0:
train_error = cost
else:
train_error = train_error * 0.95 + cost * 0.05
train_costs.append(cost)
if numpy.mod(uidx, dispFreq) == 0:
print 'Epoch ', eidx, 'Update ', uidx, 'Train cost mean so far', \
train_error, 'fetching data time spent (sec)', pd_duration, \
'update time spent (sec)', ud_duration, 'save_dir', save_model_dir
alphas, betas = f_alpha(x, mask, ctx, ctx_mask)
counts = mask.sum(0)
betas_mean = (betas * mask).sum(0) / counts
betas_mean = betas_mean.mean()
print 'alpha ratio %.3f, betas mean %.3f' % (
alphas.min(-1).mean() /
(alphas.max(-1)).mean(), betas_mean)
l = 0
for vv in x[:, 0]:
if vv == 0:
break
if vv in engine.word_idict:
print '(', numpy.round(betas[l, 0],
3), ')', engine.word_idict[vv],
else:
print '(', numpy.round(betas[l, 0], 3), ')', 'UNK',
l += 1
print '(', numpy.round(betas[l, 0], 3), ')'
if numpy.mod(uidx, saveFreq) == 0:
pass
if numpy.mod(uidx, sampleFreq) == 0:
use_noise.set_value(0.)
print '------------- sampling from train ----------'
x_s = x
mask_s = mask
ctx_s = ctx
ctx_mask_s = ctx_mask
model.sample_execute(engine, model_options, tparams, f_init,
f_next, x_s, ctx_s, ctx_mask_s, trng)
print '------------- sampling from valid ----------'
idx = engine.kf_valid[numpy.random.randint(
1,
len(engine.kf_valid) - 1)]
tags = [engine.valid[index] for index in idx]
x_s, mask_s, ctx_s, mask_ctx_s = data_engine.prepare_data(
engine, tags)
model.sample_execute(engine, model_options, tparams, f_init,
f_next, x_s, ctx_s, mask_ctx_s, trng)
if validFreq != -1 and numpy.mod(uidx, validFreq) == 0:
t0_valid = time.time()
alphas, _ = f_alpha(x, mask, ctx, ctx_mask)
ratio = alphas.min(-1).mean() / (alphas.max(-1)).mean()
alphas_ratio.append(ratio)
numpy.savetxt(save_model_dir + 'alpha_ratio.txt', alphas_ratio)
current_params = utils.unzip(tparams)
numpy.savez(save_model_dir + 'model_current.npz',
history_errs=history_errs,
**current_params)
use_noise.set_value(0.)
train_err = -1
train_perp = -1
valid_err = -1
valid_perp = -1
test_err = -1
test_perp = -1
if not debug:
# first compute train cost
if 0:
print 'computing cost on trainset'
train_err, train_perp = model.pred_probs(
engine,
'train',
f_log_probs,
verbose=model_options['verbose'])
else:
train_err = 0.
train_perp = 0.
if 1:
print 'validating...'
valid_err, valid_perp = model.pred_probs(
engine,
'valid',
f_log_probs,
verbose=model_options['verbose'],
)
else:
valid_err = 0.
valid_perp = 0.
if 1:
print 'testing...'
test_err, test_perp = model.pred_probs(
engine,
'test',
f_log_probs,
verbose=model_options['verbose'])
else:
test_err = 0.
test_perp = 0.
mean_ranking = 0
blue_t0 = time.time()
scores, processes, queue, rqueue, shared_params = \
metrics.compute_score(
model_type='attention',
model_archive=current_params,
options=model_options,
engine=engine,
save_dir=save_model_dir,
beam=5, n_process=5,
whichset='both',
on_cpu=False,
processes=processes, queue=queue, rqueue=rqueue,
shared_params=shared_params, metric=metric,
one_time=False,
f_init=f_init, f_next=f_next, model=model
)
'''
{'blue': {'test': [-1], 'valid': [77.7, 60.5, 48.7, 38.5, 38.3]},
'alternative_valid': {'Bleu_3': 0.40702270203174923,
'Bleu_4': 0.29276570520368456,
'CIDEr': 0.25247168210607884,
'Bleu_2': 0.529069629270047,
'Bleu_1': 0.6804308797115253,
'ROUGE_L': 0.51083584331688392},
'meteor': {'test': [-1], 'valid': [0.282787550236724]}}
'''
valid_B1 = scores['valid']['Bleu_1']
valid_B2 = scores['valid']['Bleu_2']
valid_B3 = scores['valid']['Bleu_3']
valid_B4 = scores['valid']['Bleu_4']
valid_Rouge = scores['valid']['ROUGE_L']
valid_Cider = scores['valid']['CIDEr']
valid_meteor = scores['valid']['METEOR']
test_B1 = scores['test']['Bleu_1']
test_B2 = scores['test']['Bleu_2']
test_B3 = scores['test']['Bleu_3']
test_B4 = scores['test']['Bleu_4']
test_Rouge = scores['test']['ROUGE_L']
test_Cider = scores['test']['CIDEr']
test_meteor = scores['test']['METEOR']
print 'computing meteor/blue score used %.4f sec, '\
'blue score: %.1f, meteor score: %.1f'%(
time.time()-blue_t0, valid_B4, valid_meteor)
history_errs.append([
eidx, uidx, train_err, train_perp, valid_perp, test_perp,
valid_err, test_err, valid_B1, valid_B2, valid_B3,
valid_B4, valid_meteor, valid_Rouge, valid_Cider, test_B1,
test_B2, test_B3, test_B4, test_meteor, test_Rouge,
test_Cider
])
numpy.savetxt(save_model_dir + 'train_valid_test.txt',
history_errs,
fmt='%.3f')
print 'save validation results to %s' % save_model_dir
# save best model according to the best blue or meteor
if len(history_errs) > 1 and \
valid_B4 > numpy.array(history_errs)[:-1,11].max():
print 'Saving to %s...' % save_model_dir,
numpy.savez(save_model_dir +
'model_best_blue_or_meteor.npz',
history_errs=history_errs,
**best_p)
if len(history_errs) > 1 and \
valid_err < numpy.array(history_errs)[:-1,6].min():
best_p = utils.unzip(tparams)
bad_counter = 0
best_valid_err = valid_err
uidx_best_valid_err = uidx
print 'Saving to %s...' % save_model_dir,
numpy.savez(save_model_dir + 'model_best_so_far.npz',
history_errs=history_errs,
**best_p)
with open('%smodel_options.pkl' % save_model_dir,
'wb') as f:
pkl.dump(model_options, f)
print 'Done'
elif len(history_errs) > 1 and \
valid_err >= numpy.array(history_errs)[:-1,6].min():
bad_counter += 1
print 'history best ', numpy.array(history_errs)[:,
6].min()
print 'bad_counter ', bad_counter
print 'patience ', patience
if bad_counter > patience:
print 'Early Stop!'
estop = True
break
if test_B4 > 0.52 and test_meteor > 0.32:
print 'Saving to %s...' % save_model_dir,
numpy.savez(save_model_dir + 'model_' + str(uidx) + '.npz',
history_errs=history_errs,
**current_params)
print 'Train ', train_err, 'Valid ', valid_err, 'Test ', test_err, \
'best valid err so far',best_valid_err
print 'valid took %.2f sec' % (time.time() - t0_valid)
# end of validatioin
if debug:
break
if estop:
break
if debug:
break
# end for loop over minibatches
print 'This epoch has seen %d samples, train cost %.2f' % (
n_samples, numpy.mean(train_costs))
# end for loop over epochs
print 'Optimization ended.'
if best_p is not None:
utils.zipp(best_p, tparams)
use_noise.set_value(0.)
valid_err = 0
test_err = 0
if not debug:
#if valid:
valid_err, valid_perp = model.pred_probs(
engine, 'valid', f_log_probs, verbose=model_options['verbose'])
#if test:
#test_err, test_perp = self.pred_probs(
# 'test', f_log_probs,
# verbose=model_options['verbose'])
print 'stopped at epoch %d, minibatch %d, '\
'curent Train %.2f, current Valid %.2f, current Test %.2f '%(
eidx,uidx,numpy.mean(train_err),numpy.mean(valid_err),numpy.mean(test_err))
params = copy.copy(best_p)
numpy.savez(save_model_dir + 'model_best.npz',
train_err=train_err,
valid_err=valid_err,
test_err=test_err,
history_errs=history_errs,
**params)
if history_errs != []:
history = numpy.asarray(history_errs)
best_valid_idx = history[:, 6].argmin()
numpy.savetxt(save_model_dir + 'train_valid_test.txt',
history,
fmt='%.4f')
print 'final best exp ', history[best_valid_idx]
return train_err, valid_err, test_err
def train(random_seed=1234,
dim_word=256, # word vector dimensionality
ctx_dim=-1, # context vector dimensionality, auto set
dim=1000, # the number of LSTM units
n_layers_out=1,
n_layers_init=1,
encoder='none',
encoder_dim=100,
prev2out=False,
ctx2out=False,
patience=10,
max_epochs=5000,
dispFreq=100,
decay_c=0.,
alpha_c=0.,
alpha_entropy_r=0.,
lrate=0.01,
selector=False,
n_words=100000,
maxlen=100, # maximum length of the description
optimizer='adadelta',
clip_c=2.,
batch_size = 64,
valid_batch_size = 64,
save_model_dir='/data/lisatmp3/yaoli/exp/capgen_vid/attention/test/',
validFreq=10,
saveFreq=10, # save the parameters after every saveFreq updates
sampleFreq=10, # generate some samples after every sampleFreq updates
metric='blue',
dataset='youtube2text',
video_feature='googlenet',
use_dropout=False,
reload_=False,
from_dir=None,
K1=10,
K2=10,
OutOf=240,
verbose=True,
debug=True
):
rng_numpy, rng_theano = utils.get_two_rngs()
model_options = locals().copy()
model_options_c = locals().copy()
if 'self' in model_options:
del model_options['self']
with open('model_files/model_options.pkl', 'wb') as f:
pkl.dump(model_options, f)
with open('model_files/model_options_c3d.pkl', 'wb') as f:
pkl.dump(model_options_c, f)
# instance model
layers = Layers()
model = Model()
model_c = Model()
print 'Loading data'
engine = data_engine.Movie2Caption('attention', dataset,
video_feature,
batch_size, valid_batch_size,
maxlen, n_words,
K1, K2, OutOf)
model_options['ctx_dim'] = engine.ctx_dim
model_options_c['ctx_dim'] = engine.ctx_dim_c
model_options['n_words'] = engine.n_words
model_options_c['n_words'] = engine.n_words
print 'n_words:', model_options['n_words']
print model_options_c['dim'],model_options_c['ctx_dim']
# set test values, for debugging
idx = engine.kf_train[0]
[x_tv, mask_tv,
ctx_tv, ctx_mask_tv,
ctx_tv_c, ctx_mask_tv_c] = data_engine.prepare_data(
engine, [engine.train[index] for index in idx])
print 'init params'
t0 = time.time()
params = model.init_params(model_options)
params_c = model_c.init_params(model_options_c)
# reloading
model_saved = 'model_files/model_resnet.npz'
model_saved_c = 'model_files/model_c3d.npz'
assert os.path.isfile(model_saved)
print "Reloading model params..."
params = utils.load_params(model_saved, params)
params_c = utils.load_params(model_saved_c, params_c)
tparams = utils.init_tparams(params)
tparams_c = utils.init_tparams(params_c)
trng, use_noise, \
x, mask, ctx, mask_ctx, \
cost, extra = \
model.build_model(tparams, model_options)
alphas = extra[1]
betas = extra[2]
trng_c, use_noise_c, \
x_c, mask_c, ctx_c, mask_ctx_c, \
cost_c, extra_c = \
model_c.build_model(tparams_c, model_options_c)
alphas_c = extra_c[1]
betas_c = extra_c[2]
print 'buliding sampler'
f_init, f_next = model.build_sampler(tparams, model_options, use_noise, trng)
f_init_c, f_next_c = model_c.build_sampler(tparams_c, model_options_c, use_noise_c, trng_c)
# before any regularizer
print 'building f_log_probs'
f_log_probs = theano.function([x, mask, ctx, mask_ctx], -cost,
profile=False, on_unused_input='ignore')
f_log_probs_c = theano.function([x_c, mask_c, ctx_c, mask_ctx_c], -cost_c,
profile=False, on_unused_input='ignore')
bad_counter = 0
processes = None
queue = None
rqueue = None
shared_params = None
uidx = 0
uidx_best_blue = 0
uidx_best_valid_err = 0
estop = False
best_p = utils.unzip(tparams)
best_blue_valid = 0
best_valid_err = 999
alphas_ratio = []
for eidx in xrange(max_epochs):
n_samples = 0
train_costs = []
grads_record = []
print 'Epoch ', eidx
for idx in engine.kf_train:
tags = [engine.train[index] for index in idx]
n_samples += len(tags)
use_noise.set_value(1.)
pd_start = time.time()
x, mask, ctx, ctx_mask, ctx_c, ctx_mask_c = data_engine.prepare_data(
engine, tags)
#print 'x:',x.shape,'ctx:',ctx.shape,'ctx_c:',ctx_c.shape
pd_duration = time.time() - pd_start
if x is None:
print 'Minibatch with zero sample under length ', maxlen
continue
if numpy.mod(uidx, saveFreq) == 0:
pass
if numpy.mod(uidx, sampleFreq) == 0:
use_noise.set_value(0.)
print '------------- sampling from train ----------'
x_s = x
mask_s = mask
ctx_s = ctx
ctx_s_c = ctx_c
ctx_mask_s = ctx_mask
ctx_mask_s_c = ctx_mask_c
model.sample_execute_ensemble(engine, model_options,model_options_c, tparams,tparams_c,
f_init,f_init_c, f_next,f_next_c, x_s, ctx_s,
ctx_mask_s, ctx_s_c, ctx_mask_s_c, trng)
print '------------- sampling from valid ----------'
idx = engine.kf_valid[numpy.random.randint(1, len(engine.kf_valid) - 1)]
tags = [engine.valid[index] for index in idx]
x_s, mask_s, ctx_s, mask_ctx_s, ctx_s_c,mask_ctx_s_c = data_engine.prepare_data(engine, tags)
model.sample_execute_ensemble(engine, model_options,model_options_c, tparams,tparams_c,
f_init, f_init_c, f_next, f_next_c, x_s, ctx_s,
mask_ctx_s, ctx_s_c, mask_ctx_s_c, trng)
if validFreq != -1 and numpy.mod(uidx, validFreq) == 0:
current_params = utils.unzip(tparams)
use_noise.set_value(0.)
train_err = -1
train_perp = -1
valid_err = -1
valid_perp = -1
test_err = -1
test_perp = -1
mean_ranking = 0
blue_t0 = time.time()
scores, processes, queue, rqueue, shared_params = \
metrics.compute_score_ensemble(
model_type='attention',
model_archive=current_params,
options=model_options,
options_c=model_options_c,
engine=engine,
save_dir=save_model_dir,
beam=5, n_process=5,
whichset='both',
on_cpu=False,
processes=processes, queue=queue, rqueue=rqueue,
shared_params=shared_params, metric=metric,
one_time=False,
f_init=f_init, f_init_c=f_init_c, f_next=f_next, f_next_c= f_next_c, model=model
)
'''
{'blue': {'test': [-1], 'valid': [77.7, 60.5, 48.7, 38.5, 38.3]},
'alternative_valid': {'Bleu_3': 0.40702270203174923,
'Bleu_4': 0.29276570520368456,
'CIDEr': 0.25247168210607884,
'Bleu_2': 0.529069629270047,
'Bleu_1': 0.6804308797115253,
'ROUGE_L': 0.51083584331688392},
'meteor': {'test': [-1], 'valid': [0.282787550236724]}}
'''
valid_B1 = scores['valid']['Bleu_1']
valid_B2 = scores['valid']['Bleu_2']
valid_B3 = scores['valid']['Bleu_3']
valid_B4 = scores['valid']['Bleu_4']
valid_Rouge = scores['valid']['ROUGE_L']
valid_Cider = scores['valid']['CIDEr']
valid_meteor = scores['valid']['METEOR']
test_B1 = scores['test']['Bleu_1']
test_B2 = scores['test']['Bleu_2']
test_B3 = scores['test']['Bleu_3']
test_B4 = scores['test']['Bleu_4']
test_Rouge = scores['test']['ROUGE_L']
test_Cider = scores['test']['CIDEr']
test_meteor = scores['test']['METEOR']
print 'computing meteor/blue score used %.4f sec, '\
'blue score: %.1f, meteor score: %.1f'%(
time.time()-blue_t0, valid_B4, valid_meteor)
if test_B4>0.52 and test_meteor>0.32:
print 'Saving to %s...'%save_model_dir,
numpy.savez(
save_model_dir+'model_'+str(uidx)+'.npz',
**current_params)
print 'Train ', train_err, 'Valid ', valid_err, 'Test ', test_err, \
'best valid err so far',best_valid_err
print 'valid took %.2f sec'%(time.time() - t0_valid)
# end of validatioin
sys.exit()
if debug:
break
if estop:
break
if debug:
break
# end for loop over minibatches
print 'This epoch has seen %d samples, train cost %.2f'%(
n_samples, numpy.mean(train_costs))
# end for loop over epochs
print 'Optimization ended.'
if best_p is not None:
utils.zipp(best_p, tparams)
use_noise.set_value(0.)
valid_err = 0
test_err = 0
if not debug:
#if valid:
valid_err, valid_perp = model.pred_probs(
engine, 'valid', f_log_probs,
verbose=model_options['verbose'])
#if test:
#test_err, test_perp = self.pred_probs(
# 'test', f_log_probs,
# verbose=model_options['verbose'])
print 'stopped at epoch %d, minibatch %d, '\
'curent Train %.2f, current Valid %.2f, current Test %.2f '%(
eidx,uidx,numpy.mean(train_err),numpy.mean(valid_err),numpy.mean(test_err))
params = copy.copy(best_p)
numpy.savez(save_model_dir+'model_best.npz',
train_err=train_err,
valid_err=valid_err, test_err=test_err, history_errs=history_errs,
**params)
if history_errs != []:
history = numpy.asarray(history_errs)
best_valid_idx = history[:,6].argmin()
numpy.savetxt(save_model_dir+'train_valid_test.txt', history, fmt='%.4f')
print 'final best exp ', history[best_valid_idx]
return train_err, valid_err, test_err
def train(
self,
random_seed=1234,
dim_word=256, # word vector dimensionality
use_w2v=False,
w2v_embs=None,
ctx_dim=-1, # context vector dimensionality, auto set
obj_ctx_dim=-1,
cond_dim=1024, # the number of LSTM units
fc_dim=1000,
obj_fc_dim=512,
n_words_out=1,
n_layers_init=1,
n_loops=1,
encoder='none',
encoder_dim=1000,
patience=30,
max_epochs=5000,
dispFreq=100,
decay_c=0.,
alpha_c=0.,
alpha_entropy_r=0.,
lrate=0.01,
selector=False,
n_words=6500,
maxlen=50, # maximum length of the description
optimizer=adadelta,
clip_c=2.,
batch_size=64,
valid_batch_size=64,
save_model_dir='./snapshots/',
save_file_prefix='lstm',
validFreq=10,
saveFreq=1500, # save the parameters after every saveFreq updates
sampleFreq=1000, # generate some samples after every sampleFreq updates
video_feature='vggnet',
saveto='model_best_so_far.npz',
use_dropout=False,
reload_=False,
from_dir=None,
verbose=True,
debug=True):
self.rng_numpy, self.rng_theano = utils.get_two_rngs()
model_options = locals().copy()
if 'self' in model_options:
del model_options['self']
print('Loading data')
# answer word dict
ans_word_dict = pickle.load(open('./data/ansdict.pkl'))
self.ans_words = dict((i, w) for w, i in ans_word_dict.items())
# gif id -> list of frames
gif_dict = pickle.load(open('./data/tgif_key_dict.pkl'))
self.gif_dict = gif_dict
# gif id -> list of frames -> list of objects(regions)
self.load_obj_dict('./data')
saveto = os.path.join(save_model_dir, save_file_prefix + '_' + saveto)
train, valid, test = load_data()
ydim = numpy.max(train[2]) + 1
model_options['ydim'] = ydim
model_options['ctx_dim'] += model_options['obj_fc_dim']
model_options = validate_options(model_options)
model_options_file = save_file_prefix + '_model_options.pkl'
with open('%s/%s' % (save_model_dir, model_options_file), 'wb') as f:
pickle.dump(model_options, f)
kf_valid = get_minibatches_idx(len(valid[0]), valid_batch_size)
kf_test = get_minibatches_idx(len(test[0]), valid_batch_size)
print('init params')
t0 = time.time()
params = self.init_params(model_options)
# reloading
if reload_:
model_saved = from_dir + 'model_best_so_far.npz'
# model_saved = from_dir + saveto
assert os.path.isfile(model_saved)
print("Reloading model params...")
params = load_params(model_saved, params)
tparams = init_tparams(params)
(trng, use_noise, x, mask, ctx, mask_ctx, obj_ctx, mask_obj_ctx, y,
alphas, cost, extra, f_pred_prob, f_pred,
f_debug) = self.build_model(tparams, model_options)
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
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
if alpha_entropy_r > 0:
alpha_entropy_r = theano.shared(numpy.float32(alpha_entropy_r),
name='alpha_entropy_r')
alpha_reg_2 = alpha_entropy_r * (-tensor.sum(
alphas * tensor.log(alphas + 1e-8), axis=-1)).sum(0).mean()
cost += alpha_reg_2
else:
alpha_reg_2 = tensor.zeros_like(cost)
print('building f_alpha')
f_alpha = theano.function(
[x, mask, ctx, mask_ctx, obj_ctx, mask_obj_ctx, y],
[alphas, alpha_reg_2],
name='f_alpha',
on_unused_input='ignore')
f_cost = theano.function(
[x, mask, ctx, mask_ctx, obj_ctx, mask_obj_ctx, y],
cost,
name='f_cost')
print('compute grad')
grads = tensor.grad(cost, wrt=itemlist(tparams))
if clip_c > 0.:
g2 = 0.
for g in grads:
g2 += (g**2).sum()
new_grads = []
for g in grads:
new_grads.append(
tensor.switch(g2 > (clip_c**2),
g / tensor.sqrt(g2) * clip_c, g))
grads = new_grads
f_grad = theano.function(
[x, mask, ctx, mask_ctx, obj_ctx, mask_obj_ctx, y],
grads,
name='f_grad')
lr = tensor.scalar(name='lr')
f_grad_shared, f_update = optimizer(
lr, tparams, grads,
[x, mask, ctx, mask_ctx, obj_ctx, mask_obj_ctx, y], cost)
print('Optimization')
print("%d train examples" % len(train[0]))
print("%d valid examples" % len(valid[0]))
print("%d test examples" % len(test[0]))
history_errs = []
alphas_ratio = []
best_alpha_ratio = None
best_p = None
bad_count = 0
pred_error = self.pred_error
if validFreq == -1:
validFreq = len(train[0]) // batch_size
if saveFreq == -1:
saveFreq = len(train[0]) // batch_size
uidx = 0 # the number of update done
estop = False # early stop
start_time = time.time()
try:
for eidx in range(max_epochs):
n_samples = 0
# Get new shuffled index for the training set.
kf = get_minibatches_idx(len(train[0]),
batch_size,
shuffle=True)
for _, train_index in kf:
uidx += 1
n_samples += len(train_index)
use_noise.set_value(1.)
# Select the random examples for this minibatch
(x_args, y, _) = \
self.prepare_all(prepare_data, train, train_index, split='train')
all_args = x_args + [y]
# print (f_debug[0](x_args[0], x_args[4], x_args[5]))
cost = f_grad_shared(*all_args)
f_update(lrate)
if numpy.isnan(cost) or numpy.isinf(cost):
print('bad cost detected: ', cost)
return 1., 1., 1.
if numpy.mod(uidx, dispFreq) == 0:
alphas, reg = f_alpha(*all_args)
print(
'Epoch ', eidx, 'Update ', uidx, 'Cost ', cost,
'Alpha ratio %.3f, reg %.3f' %
(alphas.min(-1).mean() /
(alphas.max(-1).mean()), reg))
if saveto and numpy.mod(uidx, saveFreq) == 0:
print('Saving...')
alpha_saveto = os.path.join(
save_model_dir,
save_file_prefix + '_alpha_ratio.txt')
numpy.savetxt(alpha_saveto, best_alpha_ratio)
if best_p is not None:
params = best_p
else:
params = unzip(tparams)
numpy.savez(saveto,
history_errs=history_errs,
**params)
pickle.dump(model_options,
open('%s.pkl' % saveto, 'wb'), -1)
print('Done')
if numpy.mod(uidx, validFreq) == 0:
use_noise.set_value(0.)
alphas, _ = f_alpha(*all_args)
ratio = alphas.min(-1).mean() / (alphas.max(-1)).mean()
alphas_ratio.append(ratio)
train_err = pred_error(f_pred, prepare_data, train, kf,
'train', f_debug)
valid_err = pred_error(f_pred, prepare_data, valid,
kf_valid, 'val', f_debug)
test_err = pred_error(f_pred, prepare_data, test,
kf_test, 'test', f_debug)
history_errs.append([valid_err, test_err])
if (best_p is None or valid_err <=
numpy.array(history_errs)[:, 0].min()):
best_p = unzip(tparams)
best_alpha_ratio = alphas_ratio
bad_counter = 0
print(('Train ', train_err, 'Valid ', valid_err,
'Test ', test_err))
logging.info(
'Epoch: %d, Update: %d, Train %s, Valid %s, Test %s'
% (eidx, uidx, train_err, valid_err, test_err))
if (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('Seen %d samples' % n_samples)
if estop:
break
except KeyboardInterrupt:
print("Training interupted")
end_time = time.time()
if best_p is not None:
zipp(best_p, tparams)
else:
best_p = unzip(tparams)
use_noise.set_value(0.)
kf_train_sorted = get_minibatches_idx(len(train[0]), batch_size)
train_err = pred_error(f_pred, prepare_data, train, kf_train_sorted,
'train', f_debug)
valid_err = pred_error(f_pred, prepare_data, valid, kf_valid, 'val',
f_debug)
test_err = pred_error(f_pred, prepare_data, test, kf_test, 'test',
f_debug)
print('Train ', train_err, 'Valid ', valid_err, 'Test ', test_err)
if saveto:
numpy.savez(saveto,
train_err=train_err,
valid_err=valid_err,
test_err=test_err,
history_errs=history_errs,
**best_p)
print('The code run for %d epochs, with %f sec/epochs' %
((eidx + 1), (end_time - start_time) / (1. * (eidx + 1))))
print(('Training took %.1fs' % (end_time - start_time)),
file=sys.stderr)
return train_err, valid_err, test_err
