def main(params):
word_count_threshold = params['word_count_threshold']
max_epochs = params['max_epochs']
host = socket.gethostname() # get computer hostname
# fetch the data provider
dp = getDataProvider(params)
# Initialize the optimizer
solver = Solver(params['solver'])
params['image_feat_size'] = dp.img_feat_size
misc = {} # stores various misc items that need to be passed around the framework
# go over all training sentences and find the vocabulary we want to use, i.e. the words that occur
# at least word_count_threshold number of times
misc['wordtoix'], misc['ixtoword'], bias_init_vector = preProBuildWordVocab(dp.iterSentences('train'), word_count_threshold)
params['use_dropout'] = 1
if params['fine_tune'] == 1:
params['mode'] = 'multimodal_lstm' if params['multimodal_lstm'] == 0 else 'multimodal_lstm'
if params['checkpoint_file_name'] != None:
params['batch_size'] = dp.dataset['batchsize']
misc['wordtoix'] = checkpoint_init['wordtoix']
misc['ixtoword'] = checkpoint_init['ixtoword']
batch_size = 1
num_sentences_total = dp.getSplitSize('train', ofwhat = 'images')
else:
params['mode'] = 'batchtrain'
batch_size = params['batch_size']
num_sentences_total = dp.getSplitSize('train', ofwhat = 'sentences')
params['vocabulary_size'] = len(misc['wordtoix'])
pos_samp = np.arange(batch_size,dtype=np.int32)
# This initializes the model parameters and does matrix initializations
evalModel = decodeEvaluator(params)
model, misc['update'], misc['regularize'] = (evalModel.model_th, evalModel.updateP, evalModel.regularize)
# Define the computational graph for relating the input image features and word indices to the
# log probability cost funtion.
(use_dropout, inp_list,
miscOuts, cost, predTh, model) = evalModel.build_model(model, params)
# Add the regularization cost. Since this is specific to trainig and doesn't get included when we
# evaluate the cost on test or validation data, we leave it here outside the model definition
if params['regc'] > 0.:
reg_cost = theano.shared(numpy_floatX(0.), name='reg_c')
reg_c = tensor.as_tensor_variable(numpy_floatX(params['regc']), name='reg_c')
reg_cost = 0.
for p in misc['regularize']:
reg_cost += (model[p] ** 2).sum()
reg_cost *= 0.5 * reg_c
cost[0] += (reg_cost /params['batch_size'])
# Compile an evaluation function.. Doesn't include gradients
# To be used for validation set evaluation
f_eval= theano.function(inp_list, cost, name='f_eval')
# Now let's build a gradient computation graph and rmsprop update mechanism
grads = tensor.grad(cost, wrt=model.values())
lr = tensor.scalar(name='lr',dtype=config.floatX)
if params['sim_minibatch'] > 0:
f_grad_accum, f_clr, ag = solver.accumGrads(model,grads,inp_list,cost, params['sim_minibatch'])
f_grad_shared, f_update, zg, rg, ud = solver.build_solver_model(lr, model, ag,
inp_list, cost, params)
else:
f_grad_shared, f_update, zg, rg, ud = solver.build_solver_model(lr, model, grads,
inp_list, cost, params)
print 'model init done.'
print 'model has keys: ' + ', '.join(model.keys())
# calculate how many iterations we need, One epoch is considered once going through all the sentences and not images
# Hence in case of coco/flickr this will 5* no of images
num_iters_one_epoch = num_sentences_total / batch_size
max_iters = max_epochs * num_iters_one_epoch
inner_loop = params['sim_minibatch'] if params['sim_minibatch'] > 0 else 1
max_iters = max_iters / inner_loop
eval_period_in_epochs = params['eval_period']
eval_period_in_iters = max(1, int(num_iters_one_epoch * eval_period_in_epochs/ inner_loop))
top_val_ppl2 = -1
smooth_train_cost = len(misc['ixtoword']) # initially size of dictionary of confusion
val_ppl2 = len(misc['ixtoword'])
last_status_write_time = 0 # for writing worker job status reports
json_worker_status = {}
json_worker_status['params'] = params
json_worker_status['history'] = []
len_hist = defaultdict(int)
## Initialize the model parameters from the checkpoint file if we are resuming training
if params['checkpoint_file_name'] != None:
zipp(model_init_from,model)
zipp(rg_init,rg)
print("\nContinuing training from previous model\n. Already run for %0.2f epochs with validation perplx at %0.3f\n" % (checkpoint_init['epoch'], \
checkpoint_init['perplexity']))
elif params['init_from_imagernn'] != None:
# Initialize word vecs and image emb from generative model file
rnnCv = pickle.load(open(params['init_from_imagernn'], 'rb'))
model['Wemb'].set_value(rnnCv['model']['Wemb'])
model['WIemb'].set_value(rnnCv['model']['WIemb_aux'])
misc['wordtoix'] = rnnCv['wordtoix']
misc['ixtoword'] = rnnCv['ixtoword']
print("\n Initialized Word embedding and Image embeddings from gen mode %s" % (params['init_from_imagernn']))
use_dropout.set_value(1.)
#################### Main Loop ############################################
for it in xrange(max_iters):
t0 = time.time()
# fetch a batch of data
cost_inner = np.zeros((inner_loop,),dtype=np.float32)
if params['sim_minibatch'] > 0:
for i_l in xrange(inner_loop):
batch,pos_samp_sent = dp.sampPosNegSentSamps(params['batch_size'],params['mode'],thresh=0.3)
real_inp_list, lenS = prepare_data(batch,misc['wordtoix'],maxlen=params['maxlen'],pos_samp=pos_samp,prep_for=params['eval_model'])
if params['fine_tune'] == 1:
real_inp_list.append(pos_samp_sent)
cost_inner[i_l] = f_grad_accum(*real_inp_list)
else:
batch,pos_samp_sent = dp.sampPosNegSentSamps(params['batch_size'],params['mode'],thresh=0.3)
real_inp_list, lenS = prepare_data(batch,misc['wordtoix'],maxlen=params['maxlen'],pos_samp=pos_samp,prep_for=params['eval_model'])
if params['fine_tune'] == 1:
real_inp_list.append(pos_samp_sent)
# Enable using dropout in training
cost = f_grad_shared(*real_inp_list)
f_update(params['learning_rate'])
dt = time.time() - t0
# Reset accumulated gradients to 0
if params['sim_minibatch'] > 0:
f_clr()
#print 'model: ' + ' '.join([str(np.isnan(model[m].get_value()).any()) for m in model])
#print 'rg: ' +' '.join([str(np.isnan(rg[i].get_value()).any()) for i in xrange(len(rg))])
#print 'zg: ' + ' '.join([str(np.isnan(zg[i].get_value()).any()) for i in xrange(len(zg))])
#print 'ud: ' + ' '.join([str(np.isnan(ud[i].get_value()).any()) for i in xrange(len(ud))])
#import pdb; pdb.set_trace()
#print 'udAft: ' + ' '.join([str(np.isnan(ud[i].get_value()).any()) for i in xrange(len(ud))])
# print training statistics
epoch = it*inner_loop * 1.0 / num_iters_one_epoch
total_cost = (np.e**-cost + (np.e**(-cost_inner)).sum()*(params['sim_minibatch'] > 0))/ (1 + params['sim_minibatch'])
#print '%d/%d batch done in %.3fs. at epoch %.2f. loss cost = %f, reg cost = %f, ppl2 = %.2f (smooth %.2f)' \
# % (it, max_iters, dt, epoch, cost['loss_cost'], cost['reg_cost'], \
# train_ppl2, smooth_train_cost)
if it == 0: smooth_train_cost = total_cost
else: smooth_train_cost = 0.99 * smooth_train_cost + 0.01 * total_cost
tnow = time.time()
if tnow > last_status_write_time + 60*1: # every now and then lets write a report
print '%d/%d batch done in %.3fs. at epoch %.2f. Prob now is %.3f' % (it, max_iters, dt, \
epoch, smooth_train_cost)
last_status_write_time = tnow
jstatus = {}
jstatus['time'] = datetime.datetime.now().isoformat()
jstatus['iter'] = (it, max_iters)
jstatus['epoch'] = (epoch, max_epochs)
jstatus['time_per_batch'] = dt
jstatus['val_ppl2'] = val_ppl2 # just write the last available one
json_worker_status['history'].append(jstatus)
status_file = os.path.join(params['worker_status_output_directory'], host + '_status.json')
#import pdb; pdb.set_trace()
try:
json.dump(json_worker_status, open(status_file, 'w'))
except Exception, e: # todo be more clever here
print 'tried to write worker status into %s but got error:' % (status_file, )
print e
## perform perplexity evaluation on the validation set and save a model checkpoint if it's good
is_last_iter = (it+1) == max_iters
if (((it+1) % eval_period_in_iters) == 0 and it < max_iters - 5) or is_last_iter:
# Disable using dropout in validation
use_dropout.set_value(0.)
val_ppl2 = eval_split_theano('val', dp, model, params, misc,f_eval) # perform the evaluation on VAL set
if epoch - params['lr_decay_st_epoch'] >= 0:
params['learning_rate'] = params['learning_rate'] * params['lr_decay']
params['lr_decay_st_epoch'] += 1
print 'validation perplexity = %f, lr = %f' % (val_ppl2, params['learning_rate'])
if params['sample_by_len'] == 1:
print len_hist
write_checkpoint_ppl_threshold = params['write_checkpoint_ppl_threshold']
if val_ppl2 < top_val_ppl2 or top_val_ppl2 < 0:
if val_ppl2 < write_checkpoint_ppl_threshold or write_checkpoint_ppl_threshold < 0:
# if we beat a previous record or if this is the first time
# AND we also beat the user-defined threshold or it doesnt exist
#top_val_ppl2 = val_ppl2
filename = '%s_checkpoint_%s_%s_%s_%.2f_%.2f.p' % (params['eval_model'], params['dataset'], host, params['fappend'],val_ppl2,smooth_train_cost)
filepath = os.path.join(params['checkpoint_output_directory'], filename)
model_npy = unzip(model)
rgrads_npy = unzip(rg)
checkpoint = {}
checkpoint['it'] = it
checkpoint['epoch'] = epoch
checkpoint['model'] = model_npy
checkpoint['rgrads'] = rgrads_npy
checkpoint['params'] = params
checkpoint['perplexity'] = val_ppl2
checkpoint['wordtoix'] = misc['wordtoix']
checkpoint['ixtoword'] = misc['ixtoword']
try:
pickle.dump(checkpoint, open(filepath, "wb"))
print 'saved checkpoint in %s' % (filepath, )
except Exception, e: # todo be more clever here
print 'tried to write checkpoint into %s but got error: ' % (filepath, )
print e
use_dropout.set_value(1.)
def main(params):
batch_size = params['batch_size']
word_count_threshold = params['word_count_threshold']
max_epochs = params['max_epochs']
# fetch the data provider
dp = getDataProvider(params)
# Initialize the optimizer
solver = Solver(params['solver'])
params['aux_inp_size'] = dp.aux_inp_size
params['image_feat_size'] = dp.img_feat_size
print 'Image feature size is %d, and aux input size is %d' % (
params['image_feat_size'], params['aux_inp_size'])
misc = {
} # stores various misc items that need to be passed around the framework
if params['checkpoint_file_name'] == 'None':
# go over all training sentences and find the vocabulary we want to use, i.e. the words that occur
# at least word_count_threshold number of times
misc['wordtoix'], misc[
'ixtoword'], bias_init_vector = preProBuildWordVocab(
dp.iterSentences('train'), word_count_threshold)
else:
# Load Vocabulary from the checkpoint
misc = checkpoint_init['misc']
params['vocabulary_size'] = len(misc['wordtoix'])
params['output_size'] = len(misc['ixtoword']) # these should match though
# This initializes the generator model parameters and does matrix initializations
if params['t_eval_only'] == 0:
generator = decodeGenerator(params)
# Build the computational graph
if params['use_encoder_for'] & 2:
aux_enc_inp = generator.model_th['Wemb'] if params[
'encode_gt_sentences'] else dp.aux_inputs.T
hid_size = params['featenc_hidden_size']
auxFeatEncoder = RecurrentFeatEncoder(
hid_size,
params['image_encoding_size'],
params,
mdl_prefix='aux_enc_',
features=aux_enc_inp)
mdlLen = len(generator.model_th.keys())
generator.model_th.update(auxFeatEncoder.model_th)
assert (len(generator.model_th.keys()) == (
mdlLen + len(auxFeatEncoder.model_th.keys())))
(auxenc_use_dropout, auxFeatEnc_inp, xAux,
updatesLSTMAuxFeat) = auxFeatEncoder.build_model(
generator.model_th, params)
if params['encode_gt_sentences']:
# Reshape it size(batch_size, n_gt, hidden_size)
xAux = xAux.reshape((-1, params['n_encgt_sent'],
params['featenc_hidden_size']))
# Convert it to size (batch_size, n_gt*hidden_size
xAux = xAux.flatten(2)
xI = tensor.zeros((batch_size, params['image_encoding_size']))
imgFeatEnc_inp = []
else:
auxFeatEnc_inp = []
imgFeatEnc_inp = []
xAux = None
xI = None
(gen_inp_list, predLogProb, predIdx, predCand, gen_out, updatesLstm,
seq_lengths) = generator.build_prediction_model(generator.model_th,
params,
xI=xI,
xAux=xAux)
gen_inp_list = imgFeatEnc_inp + auxFeatEnc_inp + gen_inp_list
gen_out = gen_out.reshape([
gen_out.shape[0], -1, params['n_gen_samples'],
params['vocabulary_size']
])
#convert updates lstm to a tuple, this is to help merge it with grad updates
updatesLstm = [(k, v) for k, v in updatesLstm.iteritems()]
f_gen_only = theano.function(
gen_inp_list, [predLogProb, predIdx, gen_out, seq_lengths],
name='f_pred',
updates=updatesLstm)
modelGen = generator.model_th
upListGen = generator.update_list
if params['use_mle_train']:
(use_dropout_genTF, inp_list_genTF, _, cost_genTF, _,
updatesLSTM_genTF) = generator.build_model(
generator.model_th, params)
f_eval_genTF = theano.function(inp_list_genTF,
cost_genTF,
name='f_eval')
grads_genTF = tensor.grad(cost_genTF[0],
wrt=modelGen.values(),
add_names=True)
lr_genTF = tensor.scalar(name='lr', dtype=config.floatX)
f_grad_genTF, f_update_genTF, zg_genTF, rg_genTF, ud_genTF = solver.build_solver_model(
lr_genTF, modelGen, grads_genTF, inp_list_genTF, cost_genTF,
params)
else:
modelGen = []
updatesLstm = []
if params['met_to_track'] != []:
trackMetargs = {'eval_metric': params['met_to_track']}
refToks, scr_info = eval_prep_refs('val', dp, params['met_to_track'])
trackMetargs['refToks'] = refToks
trackMetargs['scr_info'] = scr_info
# Initialize the evalator model
if params['share_Wemb']:
evaluator = decodeEvaluator(params, modelGen['Wemb'])
else:
evaluator = decodeEvaluator(params)
modelEval = evaluator.model_th
if params['t_eval_only'] == 0:
# Build the evaluator graph to evaluate reference and generated captions
if params.get('upd_eval_ref', 0):
(refeval_inp_list, ref_f_pred_fns, ref_costs, ref_predTh,
ref_modelEval) = evaluator.build_advers_eval(modelEval, params)
(eval_inp_list, f_pred_fns, costs, predTh,
modelEval) = evaluator.build_advers_eval(modelEval, params,
gen_inp_list, gen_out,
updatesLstm, seq_lengths)
else:
# Build the evaluator graph to evaluate only reference captions
(eval_inp_list, f_pred_fns, costs, predTh,
modelEval) = evaluator.build_advers_eval(modelEval, params)
# force overwrite here. The bias to the softmax is initialized to reflect word frequencies
if params['t_eval_only'] == 0: # and 0:
if params['checkpoint_file_name'] == 'None':
modelGen['bd'].set_value(bias_init_vector.astype(config.floatX))
if params.get('class_out_factoring', 0) == 1:
modelGen['bdCls'].set_value(
bias_init_inter_class.astype(config.floatX))
comb_inp_list = eval_inp_list
if params['t_eval_only'] == 0:
for inp in gen_inp_list:
if inp not in comb_inp_list:
comb_inp_list.append(inp)
# Compile an evaluation function.. Doesn't include gradients
# To be used for validation set evaluation or debug purposes
if params['t_eval_only'] == 0:
f_eval = theano.function(comb_inp_list,
costs[:1],
name='f_eval',
updates=updatesLstm)
else:
f_eval = theano.function(comb_inp_list, costs[:1], name='f_eval')
if params['share_Wemb']:
modelEval.pop('Wemb')
if params['fix_Wemb']:
upListGen.remove('Wemb')
#-------------------------------------------------------------------------------------------------------------------------
# Now let's build a gradient computation graph and update mechanism
#-------------------------------------------------------------------------------------------------------------------------
# First compute gradient on the evaluator params w.r.t cost
if params.get('upd_eval_ref', 0):
gradsEval_ref = tensor.grad(ref_costs[0],
wrt=modelEval.values(),
add_names=True)
gradsEval = tensor.grad(costs[0], wrt=modelEval.values(), add_names=True)
# Update functions for the evaluator
lrEval = tensor.scalar(name='lrEval', dtype=config.floatX)
if params.get('upd_eval_ref', 0):
f_grad_comp_eval_ref, f_param_update_eval_ref, _, _, _ = solver.build_solver_model(
lrEval,
modelEval,
gradsEval_ref,
refeval_inp_list,
ref_costs[0],
params,
w_clip=params['eval_w_clip'])
f_grad_comp_eval, f_param_update_eval, zg_eval, rg_eval, ud_eval = solver.build_solver_model(
lrEval,
modelEval,
gradsEval,
comb_inp_list,
costs[:1],
params,
updatesLstm,
w_clip=params['eval_w_clip'])
# Now compute gradient on the generator params w.r.t the cost
if params['t_eval_only'] == 0:
gradsGen = tensor.grad(costs[1], wrt=modelGen.values(), add_names=True)
lrGen = tensor.scalar(name='lrGen', dtype=config.floatX)
# Update functions for the generator
f_grad_comp_gen, f_param_update_gen, zg_gen, rg_gen, ud_gen = solver.build_solver_model(
lrGen, modelGen, gradsGen,
comb_inp_list[:(len(comb_inp_list) - 1 +
params['gen_feature_matching'])], costs[1], params,
updatesLstm)
#-------------------------------------------------------------------------------------------------------------------------
# If we want to track some metrics during the training, initialize stuff for that now
#-------------------------------------------------------------------------------------------------------------------------
print 'model init done.'
if params['t_eval_only'] == 0:
print 'Gen model has keys: ' + ', '.join(modelGen.keys())
print 'Eval model has keys: ' + ', '.join(modelEval.keys())
# calculate how many iterations we need, One epoch is considered once going through all the sentences and not images
# Hence in case of coco/flickr this will 5* no of images
num_sentences_total = dp.getSplitSize('train', ofwhat='images')
num_iters_one_epoch = num_sentences_total / batch_size
max_iters = max_epochs * num_iters_one_epoch
skip_first = 20
iters_eval = 5
iters_gen = 1
cost_eval_iter = []
cost_gen_iter = []
trackSc_array = []
eval_period_in_epochs = params['eval_period']
eval_period_in_iters = max(
1, int(num_iters_one_epoch * eval_period_in_epochs))
top_val_ppl2 = -1
smooth_train_ppl2 = 0.5 # initially size of dictionary of confusion
smooth_train_cost = 0.0 # initially size of dictionary of confusion
smooth_train_cost_gen = 1.0 # initially size of dictionary of confusion
val_ppl2 = len(misc['ixtoword'])
last_status_write_time = 0 # for writing worker job status reports
json_worker_status = {}
json_worker_status['params'] = params
json_worker_status['history'] = []
write_checkpoint_ppl_threshold = params['write_checkpoint_ppl_threshold']
iter_out_file = os.path.join(
'logs', 'advmodel_checkpoint_%s_%s_%s_log.npz' %
(params['dataset'], host, params['fappend']))
len_hist = defaultdict(int)
t_print_sec = 30
## Initialize the model parameters from the checkpoint file if we are resuming training
if params['checkpoint_file_name'] != 'None':
if params['t_eval_only'] != 1:
print '\n Now initing gen Model:'
zipp(model_init_gen_from, modelGen)
if 'trackers' in checkpoint_init:
trackSc_array = checkpoint_init['trackers'].get('trackScores', [])
print '\n Now initing Eval Model:'
zipp(model_init_eval_from, modelEval)
#zipp(rg_init,rgGen)
print("\nContinuing training from previous model\n. Already run for %0.2f epochs with validation perplx at %0.3f\n" % (checkpoint_init['epoch'], \
checkpoint_init['perplexity']))
##############################################################
# Define signal handler to catch ctl-c or kills so that we can save the model trained till that point
def signal_handler(signal, frame):
print('You pressed Ctrl+C! Saving Checkpoint Now before exiting!')
filename = 'advmodel_checkpoint_%s_%s_%s_%.2f_INT.p' % (
params['dataset'], host, params['fappend'], val_ppl2)
dumpCheckpoint(filename, params, modelGen, modelEval, misc, it,
val_ppl2)
sys.exit(0)
#signal.signal(signal.SIGINT, signal_handler)
##############################################################
#In testing disable sampling and use the greedy approach!?
generator.usegumbel.set_value(1)
if params['met_to_track'] != []:
tsc_max, tsc_mean, tsc_min = eval_gen_samps(f_gen_only, dp, params,
misc, params['rev_eval'],
**trackMetargs)
trackSc_array.append((0, {
evm + '_max': tsc_max[i]
for i, evm in enumerate(params['met_to_track'])
}))
trackSc_array[-1][1].update({
evm + '_mean': tsc_mean[i]
for i, evm in enumerate(params['met_to_track'])
})
trackSc_array[-1][1].update({
evm + '_min': tsc_min[i]
for i, evm in enumerate(params['met_to_track'])
})
disp_some_gen_samps(f_gen_only, dp, params, misc, n_samp=5)
evaluator.use_noise.set_value(1.)
eval_acc, gen_acc = eval_discrm_gen('val', dp, params, f_pred_fns[0], misc)
# Re-enable sampling
generator.usegumbel.set_value(1)
np.savez(iter_out_file,
eval_cost=np.array(cost_eval_iter),
gen_cost=np.array(cost_gen_iter),
tracksc=np.array(trackSc_array))
smooth_train_cost = 0.0
print '###################### NOW BEGINNING TRAINING #################################'
for it in xrange(max_iters):
t0 = time.time()
# Enable using dropout in training
evaluator.use_noise.set_value(1.)
dt = 0.
it2 = 0
while eval_acc <= 60. or gen_acc >= 45. or it2 < iters_eval * skip_first:
# fetch a batch of data
t1 = time.time()
s_probs = [
0.6, 0.4, 0.0
] if params['eval_loss'] == 'contrastive' else [1.0, 0.0, 0.0]
batch = dp.sampAdversBatch(batch_size,
n_sent=params['n_gen_samples'],
probs=s_probs)
cnn_inps = prepare_adv_data(batch,
misc['wordtoix'],
maxlen=params['maxlen'],
prep_for=params['eval_model'])
enc_inp_list = prepare_seq_features(
batch,
use_enc_for=params['use_encoder_for'],
maxlen=params['maxlen'],
use_shared_mem=params['use_shared_mem_enc'],
enc_gt_sent=params['encode_gt_sentences'],
n_enc_sent=params['n_encgt_sent'],
wordtoix=misc['wordtoix'])
eval_cost = f_grad_comp_eval(*(cnn_inps + enc_inp_list))
if np.isnan(eval_cost[0]):
import pdb
pdb.set_trace()
f_param_update_eval(params['learning_rate_eval'])
# Track training statistics
smooth_train_cost = 0.99 * smooth_train_cost + 0.01 * eval_cost[
0] if it > 0 else eval_cost[0]
dt2 = time.time() - t1
if it2 % 500 == 499:
gb = 0. #modelGen['gumb_temp'].get_value() if params['use_gumbel_mse'] == 1 else 0
print 'Iter %d/%d Eval Only Iter %d/%d, done. in %.3fs. Eval Cost is %.6f' % (
it, max_iters, it2, iters_eval * skip_first, dt2,
smooth_train_cost)
if it2 % 100 == 99:
eval_acc, gen_acc = eval_discrm_gen('val',
dp,
params,
f_pred_fns[0],
misc,
n_eval=500)
it2 += 1
evaluator.use_noise.set_value(1.)
if it >= 0:
skip_first = 1
if it >= 100:
skip_first = 1
if it % 1000 == 999:
skip_first = 1
s_probs = [
1.0, 0.0, 0.0
] if params['eval_loss'] == 'contrastive' else [1.0, 0.0, 0.0]
batch = dp.sampAdversBatch(batch_size,
n_sent=params['n_gen_samples'],
probs=s_probs)
cnn_inps = prepare_adv_data(batch,
misc['wordtoix'],
maxlen=params['maxlen'],
prep_for=params['eval_model'])
enc_inp_list = prepare_seq_features(
batch,
use_enc_for=params['use_encoder_for'],
maxlen=params['maxlen'],
use_shared_mem=params['use_shared_mem_enc'],
enc_gt_sent=params['encode_gt_sentences'],
n_enc_sent=params['n_encgt_sent'],
wordtoix=misc['wordtoix'])
gen_cost = f_grad_comp_gen(
*(cnn_inps[:(len(cnn_inps) - 1 + params['gen_feature_matching'])] +
enc_inp_list))
f_param_update_gen(params['learning_rate_gen'])
if params['use_mle_train']:
generator.usegumbel.set_value(0)
batch, l = dp.getRandBatchByLen(batch_size)
gen_inp_list, lenS = prepare_data(batch, misc['wordtoix'],
params['maxlen'])
cost_genMLE = f_grad_genTF(*gen_inp_list)
f_update_genTF(np.float32(params['learning_rate_gen'] / 50.0))
generator.usegumbel.set_value(1)
dt = time.time() - t0
# print training statistics
smooth_train_cost_gen = gen_cost if it == 0 else 0.99 * smooth_train_cost_gen + 0.01 * gen_cost
tnow = time.time()
if tnow > last_status_write_time + t_print_sec * 1: # every now and then lets write a report
gb = 0. #modelGen['gumb_temp'].get_value() if params['use_gumbel_mse'] == 1 else 0
print 'Iter %d/%d done. in %.3fs. Eval Cost is %.6f, Gen Cost is %.6f, temp: %.4f' % (it, max_iters, dt, \
smooth_train_cost, smooth_train_cost_gen, gb)
last_status_write_time = tnow
cost_eval_iter.append(smooth_train_cost)
cost_gen_iter.append(smooth_train_cost_gen)
if it % 500 == 499:
# Run the generator on the validation set and compute some metrics
generator.usegumbel.set_value(1)
if params['met_to_track'] != []:
#In testing set the temperature to very low, so that it is equivalent to Greed samples
tsc_max, tsc_mean, tsc_min = eval_gen_samps(
f_gen_only, dp, params, misc, params['rev_eval'],
**trackMetargs)
trackSc_array.append((it, {
evm + '_max': tsc_max[i]
for i, evm in enumerate(params['met_to_track'])
}))
trackSc_array[-1][1].update({
evm + '_mean': tsc_mean[i]
for i, evm in enumerate(params['met_to_track'])
})
trackSc_array[-1][1].update({
evm + '_min': tsc_min[i]
for i, evm in enumerate(params['met_to_track'])
})
disp_some_gen_samps(f_gen_only, dp, params, misc, n_samp=5)
generator.usegumbel.set_value(1)
# if we beat a previous record or if this is the first time
# AND we also beat the user-defined threshold or it doesnt exist
top_val_ppl2 = gen_acc
if it % 500 == 499:
eval_acc, gen_acc = eval_discrm_gen('val',
dp,
params,
f_pred_fns[0],
misc,
n_eval=500)
if it % 1000 == 999:
filename = 'advmodel_checkpoint_%s_%s_%s_%d_%.2f_genacc.p' % (
params['dataset'], host, params['fappend'], it, gen_acc)
dumpCheckpoint(filename, params, modelGen, modelEval, misc, it,
gen_acc)
if it % 500 == 499:
np.savez(iter_out_file,
eval_cost=np.array(cost_eval_iter),
gen_cost=np.array(cost_gen_iter),
tracksc=np.array(trackSc_array))
# AND we also beat the user-defined threshold or it doesnt exist
filename = 'advmodel_checkpoint_%s_%s_%s_%d_%.2f_GenDone.p' % (
params['dataset'], host, params['fappend'], it, g_acc)
dumpCheckpoint(filename, params, modelGen, modelEval, misc, it, g_acc)
def main(params):
word_count_threshold = params['word_count_threshold']
max_epochs = params['max_epochs']
host = socket.gethostname() # get computer hostname
# fetch the data provider
dp = getDataProvider(params)
# Initialize the optimizer
solver = Solver(params['solver'])
params['image_feat_size'] = dp.img_feat_size
params['aux_inp_size'] = dp.aux_inp_size
misc = {
} # stores various misc items that need to be passed around the framework
# go over all training sentences and find the vocabulary we want to use, i.e. the words that occur
# at least word_count_threshold number of times
misc['wordtoix'], misc[
'ixtoword'], bias_init_vector = preProBuildWordVocab(
dp.iterSentences('train'), word_count_threshold)
if params['fine_tune'] == 1:
params['mode'] = 'multi_choice_mode' if params[
'mc_mode'] == 1 else 'multimodal_lstm'
if params['checkpoint_file_name'] != None:
#params['batch_size'] = dp.dataset['batchsize']
misc['wordtoix'] = checkpoint_init['wordtoix']
misc['ixtoword'] = checkpoint_init['ixtoword']
batch_size = 1
num_sentences_total = dp.getSplitSize('train', ofwhat='images')
else:
params['mode'] = 'batchtrain'
batch_size = params['batch_size']
num_sentences_total = dp.getSplitSize('train', ofwhat='sentences')
params['vocabulary_size'] = len(misc['wordtoix'])
pos_samp = np.arange(batch_size, dtype=np.int32)
# This initializes the model parameters and does matrix initializations
evalModel = decodeEvaluator(params)
model, misc['update'], misc['regularize'] = (evalModel.model_th,
evalModel.updateP,
evalModel.regularize)
#----------------- If we are using feature encoders -----------------------
if params['use_encoder_for'] & 1:
imgFeatEncoder = RecurrentFeatEncoder(params['image_feat_size'],
params['sent_encoding_size'],
params,
mdl_prefix='img_enc_',
features=dp.features.T)
mdlLen = len(model.keys())
model.update(imgFeatEncoder.model_th)
assert (len(model.keys()) == (mdlLen +
len(imgFeatEncoder.model_th.keys())))
#misc['update'].extend(imgFeatEncoder.update_list)
misc['regularize'].extend(imgFeatEncoder.regularize)
(imgenc_use_dropout, imgFeatEnc_inp, xI,
updatesLSTMImgFeat) = imgFeatEncoder.build_model(model, params)
else:
xI = None
imgFeatEnc_inp = []
# Define the computational graph for relating the input image features and word indices to the
# log probability cost funtion.
(use_dropout, inp_list_eval, miscOuts, cost, predTh,
model) = evalModel.build_model(model,
params,
xI=xI,
prior_inp_list=imgFeatEnc_inp)
inp_list = imgFeatEnc_inp + inp_list_eval
# Compile an evaluation function.. Doesn't include gradients
# To be used for validation set evaluation
f_eval = theano.function(inp_list, cost, name='f_eval')
# Add the regularization cost. Since this is specific to trainig and doesn't get included when we
# evaluate the cost on test or validation data, we leave it here outside the model definition
if params['regc'] > 0.:
reg_cost = theano.shared(numpy_floatX(0.), name='reg_c')
reg_c = tensor.as_tensor_variable(numpy_floatX(params['regc']),
name='reg_c')
for p in misc['regularize']:
reg_cost += (model[p]**2).sum()
reg_cost *= 0.5 * reg_c
cost[0] += (reg_cost / params['batch_size'])
# Now let's build a gradient computation graph and rmsprop update mechanism
grads = tensor.grad(cost[0], wrt=model.values())
lr = tensor.scalar(name='lr', dtype=config.floatX)
if params['sim_minibatch'] > 0:
f_grad_accum, f_clr, ag = solver.accumGrads(model, grads, inp_list,
cost,
params['sim_minibatch'])
f_grad_shared, f_update, zg, rg, ud = solver.build_solver_model(
lr, model, ag, inp_list, cost, params)
else:
f_grad_shared, f_update, zg, rg, ud = solver.build_solver_model(
lr, model, grads, inp_list, cost, params)
print 'model init done.'
print 'model has keys: ' + ', '.join(model.keys())
# calculate how many iterations we need, One epoch is considered once going through all the sentences and not images
# Hence in case of coco/flickr this will 5* no of images
num_iters_one_epoch = num_sentences_total / batch_size
max_iters = max_epochs * num_iters_one_epoch
inner_loop = params['sim_minibatch'] if params['sim_minibatch'] > 0 else 1
max_iters = max_iters / inner_loop
eval_period_in_epochs = params['eval_period']
eval_period_in_iters = max(
1, int(num_iters_one_epoch * eval_period_in_epochs / inner_loop))
top_val_ppl2 = -1
smooth_train_cost = len(
misc['ixtoword']) # initially size of dictionary of confusion
smooth_error_rate = 100.
error_rate = 0.
prev_it = -1
val_ppl2 = len(misc['ixtoword'])
last_status_write_time = 0 # for writing worker job status reports
json_worker_status = {}
json_worker_status['params'] = params
json_worker_status['history'] = []
len_hist = defaultdict(int)
## Initialize the model parameters from the checkpoint file if we are resuming training
if params['checkpoint_file_name'] != None:
zipp(model_init_from, model)
zipp(rg_init, rg)
print("\nContinuing training from previous model\n. Already run for %0.2f epochs with validation perplx at %0.3f\n" % (checkpoint_init['epoch'], \
checkpoint_init['perplexity']))
elif params['init_from_imagernn'] != None:
# Initialize word vecs and image emb from generative model file
rnnCv = pickle.load(open(params['init_from_imagernn'], 'rb'))
model['Wemb'].set_value(rnnCv['model']['Wemb'])
model['WIemb'].set_value(rnnCv['model']['WIemb_aux'])
misc['wordtoix'] = rnnCv['wordtoix']
misc['ixtoword'] = rnnCv['ixtoword']
print(
"\n Initialized Word embedding and Image embeddings from gen mode %s"
% (params['init_from_imagernn']))
write_checkpoint_ppl_threshold = params['write_checkpoint_ppl_threshold']
use_dropout.set_value(1.)
#################### Main Loop ############################################
for it in xrange(max_iters):
t0 = time.time()
if params['use_encoder_for'] & 1:
imgenc_use_dropout.set_value(float(params['use_dropout']))
# fetch a batch of data
cost_inner = np.zeros((inner_loop, ), dtype=np.float32)
if params['sim_minibatch'] > 0:
for i_l in xrange(inner_loop):
batch, pos_samp_sent = dp.sampPosNegSentSamps(
params['batch_size'], params['mode'], thresh=0.3)
eval_inp_list, lenS = prepare_data(
batch,
misc['wordtoix'],
maxlen=params['maxlen'],
pos_samp=pos_samp,
prep_for=params['eval_model'],
use_enc_for=params['use_encoder_for'])
if params['fine_tune'] == 1:
eval_inp_list.append(pos_samp_sent)
cost_inner[i_l] = f_grad_accum(*eval_inp_list)
else:
batch, pos_samp_sent = dp.sampPosNegSentSamps(params['batch_size'],
params['mode'],
thresh=0.3)
enc_inp_list = prepare_seq_features(
batch,
use_enc_for=params['use_encoder_for'],
use_shared_mem=params['use_shared_mem_enc'])
eval_inp_list, lenS = prepare_data(
batch,
misc['wordtoix'],
maxlen=params['maxlen'],
pos_samp=pos_samp,
prep_for=params['eval_model'],
use_enc_for=params['use_encoder_for'])
if params['fine_tune'] == 1:
eval_inp_list.append(pos_samp_sent)
real_inp_list = enc_inp_list + eval_inp_list
# Enable using dropout in training
cost = f_grad_shared(*real_inp_list)
f_update(params['learning_rate'])
dt = time.time() - t0
# Reset accumulated gradients to 0
if params['sim_minibatch'] > 0:
f_clr()
#print 'model: ' + ' '.join([str(np.isnan(model[m].get_value()).any()) for m in model])
#print 'rg: ' +' '.join([str(np.isnan(rg[i].get_value()).any()) for i in xrange(len(rg))])
#print 'zg: ' + ' '.join([str(np.isnan(zg[i].get_value()).any()) for i in xrange(len(zg))])
#print 'ud: ' + ' '.join([str(np.isnan(ud[i].get_value()).any()) for i in xrange(len(ud))])
#import pdb; pdb.set_trace()
#print 'udAft: ' + ' '.join([str(np.isnan(ud[i].get_value()).any()) for i in xrange(len(ud))])
# print training statistics
epoch = it * inner_loop * 1.0 / num_iters_one_epoch
total_cost = (np.e**(-cost[0]) + (np.e**(-cost_inner)).sum() *
(params['sim_minibatch'] > 0)) / (
1 + params['sim_minibatch'])
#print '%d/%d batch done in %.3fs. at epoch %.2f. loss cost = %f, reg cost = %f, ppl2 = %.2f (smooth %.2f)' \
# % (it, max_iters, dt, epoch, cost['loss_cost'], cost['reg_cost'], \
# train_ppl2, smooth_train_cost)
if it == 0: smooth_train_cost = total_cost
else: smooth_train_cost = 0.99 * smooth_train_cost + 0.01 * total_cost
error_rate += 100.0 * float((cost[2] < 0.).sum()) / batch_size
margin_strength = cost[2].sum()
smooth_error_rate = 0.99 * smooth_error_rate + 0.01 * 100.0 * (
float(cost[1]) / batch_size) if it > 0 else 100.0 * (
float(cost[1]) / batch_size)
tnow = time.time()
if tnow > last_status_write_time + 60 * 1: # every now and then lets write a report
print '%d/%d batch done in %.3fs. at epoch %.2f. Prob now is %.4f, Error '\
'rate is %.3f%%, Margin %.2f, negMarg=%.2f' % (it, max_iters, dt, \
epoch, smooth_train_cost, smooth_error_rate,
margin_strength, error_rate/(it-prev_it))
error_rate = 0.
prev_it = it
last_status_write_time = tnow
jstatus = {}
jstatus['time'] = datetime.datetime.now().isoformat()
jstatus['iter'] = (it, max_iters)
jstatus['epoch'] = (epoch, max_epochs)
jstatus['time_per_batch'] = dt
jstatus['val_ppl2'] = val_ppl2 # just write the last available one
json_worker_status['history'].append(jstatus)
status_file = os.path.join(
params['worker_status_output_directory'],
host + '_status.json')
#import pdb; pdb.set_trace()
try:
json.dump(json_worker_status, open(status_file, 'w'))
except Exception, e: # todo be more clever here
print 'tried to write worker status into %s but got error:' % (
status_file, )
print e
## perform perplexity evaluation on the validation set and save a model checkpoint if it's good
is_last_iter = (it + 1) == max_iters
if (((it + 1) % eval_period_in_iters) == 0
and it < max_iters - 5) or is_last_iter:
# Disable using dropout in validation
use_dropout.set_value(0.)
if params['use_encoder_for'] & 1:
imgenc_use_dropout.set_value(0.)
val_ppl2 = eval_split_theano(
'val', dp, model, params, misc,
f_eval) # perform the evaluation on VAL set
if epoch - params['lr_decay_st_epoch'] >= 0:
params['learning_rate'] = params['learning_rate'] * params[
'lr_decay']
params['lr_decay_st_epoch'] += 1
print 'validation perplexity = %f, lr = %f' % (
val_ppl2, params['learning_rate'])
#if params['sample_by_len'] == 1:
# print len_hist
if val_ppl2 < top_val_ppl2 or top_val_ppl2 < 0:
if val_ppl2 < write_checkpoint_ppl_threshold or write_checkpoint_ppl_threshold < 0:
# if we beat a previous record or if this is the first time
# AND we also beat the user-defined threshold or it doesnt exist
top_val_ppl2 = val_ppl2
filename = '%s_checkpoint_%s_%s_%s_%.2f_%.2f.p' % (
params['eval_model'], params['dataset'], host,
params['fappend'], smooth_error_rate, val_ppl2)
filepath = os.path.join(
params['checkpoint_output_directory'], filename)
model_npy = unzip(model)
rgrads_npy = unzip(rg)
checkpoint = {}
checkpoint['it'] = it
checkpoint['epoch'] = epoch
checkpoint['model'] = model_npy
checkpoint['rgrads'] = rgrads_npy
checkpoint['params'] = params
checkpoint['perplexity'] = val_ppl2
checkpoint['wordtoix'] = misc['wordtoix']
checkpoint['ixtoword'] = misc['ixtoword']
try:
pickle.dump(checkpoint, open(filepath, "wb"))
print 'saved checkpoint in %s' % (filepath, )
except Exception, e: # todo be more clever here
print 'tried to write checkpoint into %s but got error: ' % (
filepath, )
print e
use_dropout.set_value(1.)
def main(params):
batch_size = params["batch_size"]
word_count_threshold = params["word_count_threshold"]
max_epochs = params["max_epochs"]
host = socket.gethostname() # get computer hostname
# fetch the data provider
dp = getDataProvider(params)
# Initialize the optimizer
solver = Solver(params["solver"])
params["aux_inp_size"] = dp.aux_inp_size
params["image_feat_size"] = dp.img_feat_size
print "Image feature size is %d, and aux input size is %d" % (params["image_feat_size"], params["aux_inp_size"])
misc = {} # stores various misc items that need to be passed around the framework
# go over all training sentences and find the vocabulary we want to use, i.e. the words that occur
# at least word_count_threshold number of times
if params["class_out_factoring"] == 0:
misc["wordtoix"], misc["ixtoword"], bias_init_vector = preProBuildWordVocab(
dp.iterSentences("train"), word_count_threshold
)
else:
[misc["wordtoix"], misc["classes"]], [misc["ixtoword"], misc["clstotree"], misc["ixtoclsinfo"]], [
bias_init_vector,
bias_init_inter_class,
] = preProBuildWordVocab(dp.iterSentences("train"), word_count_threshold, params)
params["nClasses"] = bias_init_inter_class.shape[0]
params["vocabulary_size"] = len(misc["wordtoix"])
params["output_size"] = len(misc["ixtoword"]) # these should match though
print len(misc["wordtoix"]), len(misc["ixtoword"])
# This initializes the model parameters and does matrix initializations
lstmGenerator = LSTMGenerator(params)
model, misc["update"], misc["regularize"] = (
lstmGenerator.model_th,
lstmGenerator.update_list,
lstmGenerator.regularize,
)
# force overwrite here. The bias to the softmax is initialized to reflect word frequencies
# This is a bit of a hack, not happy about it
model["bd"].set_value(bias_init_vector.astype(config.floatX))
if params["class_out_factoring"] == 1:
model["bdCls"].set_value(bias_init_inter_class.astype(config.floatX))
# Define the computational graph for relating the input image features and word indices to the
# log probability cost funtion.
(use_dropout, inp_list, f_pred_prob, cost, predTh, updatesLSTM) = lstmGenerator.build_model(model, params)
costGrad = cost[0]
# Add class uncertainity to final cost
# if params['class_out_factoring'] == 1:
# costGrad += cost[2]
# Add the regularization cost. Since this is specific to trainig and doesn't get included when we
# evaluate the cost on test or validation data, we leave it here outside the model definition
if params["regc"] > 0.0:
reg_cost = theano.shared(numpy_floatX(0.0), name="reg_c")
reg_c = tensor.as_tensor_variable(numpy_floatX(params["regc"]), name="reg_c")
reg_cost = 0.0
for p in misc["regularize"]:
reg_cost += (model[p] ** 2).sum()
reg_cost *= 0.5 * reg_c
costGrad += reg_cost / params["batch_size"]
# Compile an evaluation function.. Doesn't include gradients
# To be used for validation set evaluation
f_eval = theano.function(inp_list, cost, name="f_eval")
# Now let's build a gradient computation graph and rmsprop update mechanism
grads = tensor.grad(costGrad, wrt=model.values())
lr = tensor.scalar(name="lr", dtype=config.floatX)
f_grad_shared, f_update, zg, rg, ud = solver.build_solver_model(lr, model, grads, inp_list, cost, params)
print "model init done."
print "model has keys: " + ", ".join(model.keys())
# print 'updating: ' + ', '.join( '%s [%dx%d]' % (k, model[k].shape[0], model[k].shape[1]) for k in misc['update'])
# print 'updating: ' + ', '.join( '%s [%dx%d]' % (k, model[k].shape[0], model[k].shape[1]) for k in misc['regularize'])
# print 'number of learnable parameters total: %d' % (sum(model[k].shape[0] * model[k].shape[1] for k in misc['update']), )
# calculate how many iterations we need, One epoch is considered once going through all the sentences and not images
# Hence in case of coco/flickr this will 5* no of images
num_sentences_total = dp.getSplitSize("train", ofwhat="sentences")
num_iters_one_epoch = num_sentences_total / batch_size
max_iters = max_epochs * num_iters_one_epoch
eval_period_in_epochs = params["eval_period"]
eval_period_in_iters = max(1, int(num_iters_one_epoch * eval_period_in_epochs))
top_val_ppl2 = -1
smooth_train_ppl2 = len(misc["ixtoword"]) # initially size of dictionary of confusion
val_ppl2 = len(misc["ixtoword"])
last_status_write_time = 0 # for writing worker job status reports
json_worker_status = {}
json_worker_status["params"] = params
json_worker_status["history"] = []
len_hist = defaultdict(int)
## Initialize the model parameters from the checkpoint file if we are resuming training
if params["checkpoint_file_name"] != "None":
zipp(model_init_from, model)
zipp(rg_init, rg)
print (
"\nContinuing training from previous model\n. Already run for %0.2f epochs with validation perplx at %0.3f\n"
% (checkpoint_init["epoch"], checkpoint_init["perplexity"])
)
for it in xrange(max_iters):
t0 = time.time()
# fetch a batch of data
if params["sample_by_len"] == 0:
batch = [dp.sampleImageSentencePair() for i in xrange(batch_size)]
else:
batch, l = dp.getRandBatchByLen(batch_size)
len_hist[l] += 1
if params["use_pos_tag"] != "None":
real_inp_list, lenS = prepare_data(
batch,
misc["wordtoix"],
params["maxlen"],
sentTagMap,
misc["ixtoword"],
rev_sents=params["reverse_sentence"],
)
else:
real_inp_list, lenS = prepare_data(
batch, misc["wordtoix"], params["maxlen"], rev_sents=params["reverse_sentence"]
)
# Enable using dropout in training
use_dropout.set_value(float(params["use_dropout"]))
epoch = it * 1.0 / num_iters_one_epoch
if params["sched_sampling_mode"] != None:
real_inp_list.append(epoch)
# evaluate cost, gradient and perform parameter update
cost = f_grad_shared(*real_inp_list)
f_update(params["learning_rate"])
dt = time.time() - t0
# print training statistics
train_ppl2 = 2 ** (cost[1] / lenS) # step_struct['stats']['ppl2']
smooth_train_ppl2 = 0.99 * smooth_train_ppl2 + 0.01 * train_ppl2 # smooth exponentially decaying moving average
if it == 0:
smooth_train_ppl2 = train_ppl2 # start out where we start out
total_cost = cost[0]
# print '%d/%d batch done in %.3fs. at epoch %.2f. loss cost = %f, reg cost = %f, ppl2 = %.2f (smooth %.2f)' \
# % (it, max_iters, dt, epoch, cost['loss_cost'], cost['reg_cost'], \
# train_ppl2, smooth_train_ppl2)
tnow = time.time()
if tnow > last_status_write_time + 60 * 1: # every now and then lets write a report
print "%d/%d batch done in %.3fs. at epoch %.2f. Cost now is %.3f and pplx is %.3f" % (
it,
max_iters,
dt,
epoch,
total_cost,
train_ppl2,
)
last_status_write_time = tnow
jstatus = {}
jstatus["time"] = datetime.datetime.now().isoformat()
jstatus["iter"] = (it, max_iters)
jstatus["epoch"] = (epoch, max_epochs)
jstatus["time_per_batch"] = dt
jstatus["smooth_train_ppl2"] = smooth_train_ppl2
jstatus["val_ppl2"] = val_ppl2 # just write the last available one
jstatus["train_ppl2"] = train_ppl2
# if params['class_out_factoring'] == 1:
# jstatus['class_cost'] = float(cost[2])
json_worker_status["history"].append(jstatus)
status_file = os.path.join(params["worker_status_output_directory"], host + "_status.json")
# import pdb; pdb.set_trace()
try:
json.dump(json_worker_status, open(status_file, "w"))
except Exception, e: # todo be more clever here
print "tried to write worker status into %s but got error:" % (status_file,)
print e
## perform perplexity evaluation on the validation set and save a model checkpoint if it's good
is_last_iter = (it + 1) == max_iters
if (((it + 1) % eval_period_in_iters) == 0 and it < max_iters - 5) or is_last_iter:
# Disable using dropout in validation
use_dropout.set_value(0.0)
val_ppl2 = eval_split_theano("val", dp, model, params, misc, f_eval) # perform the evaluation on VAL set
if epoch - params["lr_decay_st_epoch"] >= 0:
params["learning_rate"] = params["learning_rate"] * params["lr_decay"]
params["lr_decay_st_epoch"] += 1
print "validation perplexity = %f, lr = %f" % (val_ppl2, params["learning_rate"])
if params["sample_by_len"] == 1:
print len_hist
write_checkpoint_ppl_threshold = params["write_checkpoint_ppl_threshold"]
if val_ppl2 < top_val_ppl2 or top_val_ppl2 < 0:
if val_ppl2 < write_checkpoint_ppl_threshold or write_checkpoint_ppl_threshold < 0:
# if we beat a previous record or if this is the first time
# AND we also beat the user-defined threshold or it doesnt exist
top_val_ppl2 = val_ppl2
filename = "model_checkpoint_%s_%s_%s_%.2f.p" % (
params["dataset"],
host,
params["fappend"],
val_ppl2,
)
filepath = os.path.join(params["checkpoint_output_directory"], filename)
model_npy = unzip(model)
rgrads_npy = unzip(rg)
checkpoint = {}
checkpoint["it"] = it
checkpoint["epoch"] = epoch
checkpoint["model"] = model_npy
checkpoint["rgrads"] = rgrads_npy
checkpoint["params"] = params
checkpoint["perplexity"] = val_ppl2
checkpoint["misc"] = misc
try:
pickle.dump(checkpoint, open(filepath, "wb"))
print "saved checkpoint in %s" % (filepath,)
except Exception, e: # todo be more clever here
print "tried to write checkpoint into %s but got error: " % (filepath,)
print e
def main(params):
batch_size = params['batch_size']
word_count_threshold = params['word_count_threshold']
max_epochs = params['max_epochs']
host = socket.gethostname() # get computer hostname
# fetch the data provider
dp = getDataProvider(params)
# Initialize the optimizer
solver = Solver(params['solver'])
params['aux_inp_size'] = dp.aux_inp_size
params['image_feat_size'] = dp.img_feat_size
print 'Image feature size is %d, and aux input size is %d'%(params['image_feat_size'],params['aux_inp_size'])
misc = {} # stores various misc items that need to be passed around the framework
# go over all training sentences and find the vocabulary we want to use, i.e. the words that occur
# at least word_count_threshold number of times
misc['wordtoix'], misc['ixtoword'], bias_init_vector = preProBuildWordVocab(dp.iterSentences('train'), word_count_threshold)
params['vocabulary_size'] = len(misc['wordtoix'])
params['output_size'] = len(misc['ixtoword']) # these should match though
params['use_dropout'] = 1
# This initializes the model parameters and does matrix initializations
generator = decodeGenerator(params)
(gen_inp_list, predLogProb, predIdx, predCand, wOut_emb, updatesLstm) = generator.build_prediction_model(
generator.model_th, params, params['beam_size'])
wOut_emb = wOut_emb.reshape([wOut_emb.shape[0],wOut_emb.shape[2]])
f_gen_only = theano.function(gen_inp_list, [predLogProb, predIdx, wOut_emb], name='f_pred', updates=updatesLstm)
modelGen = generator.model_th
upListGen = generator.update_list
if params['share_Wemb']:
evaluator = decodeEvaluator(params, modelGen['Wemb'])
else:
evaluator = decodeEvaluator(params)
modelEval = evaluator.model_th
# Define the computational graph for relating the input image features and word indices to the
# log probability cost funtion.
(use_dropout_eval, eval_inp_list,
f_pred_fns, costs, predTh, modelEval) = evaluator.build_advers_eval(modelEval, params, gen_inp_list, wOut_emb)
# force overwrite here. The bias to the softmax is initialized to reflect word frequencies
# This is a bit of a hack, not happy about it
comb_inp_list = eval_inp_list
for inp in gen_inp_list:
if inp not in comb_inp_list:
comb_inp_list.append(inp)
# Compile an evaluation function.. Doesn't include gradients
# To be used for validation set evaluation
f_eval= theano.function(comb_inp_list, costs, name='f_eval', updates=updatesLstm)
# Now let's build a gradient computation graph and rmsprop update mechanism
if params['share_Wemb']:
modelEval.pop('Wemb')
if params['fix_Wemb']:
upListGen.remove('Wemb')
modelGenUpD = OrderedDict()
for k in upListGen:
modelGenUpD[k] = modelGen[k]
gradsEval = tensor.grad(costs[0], wrt=modelEval.values(),add_names=True)
gradsGen = tensor.grad(costs[1], wrt=modelGenUpD.values(), add_names=True)
lrEval = tensor.scalar(name='lrEval',dtype=config.floatX)
f_grad_comp_eval, f_param_update_eval, zg_eval, rg_eval, ud_eval= solver.build_solver_model(lrEval, modelEval, gradsEval,
comb_inp_list, costs[0], params)
lrGen = tensor.scalar(name='lrGen',dtype=config.floatX)
f_grad_comp_gen, f_param_update_gen, zg_gen, rg_gen, ud_gen = solver.build_solver_model(lrGen, modelGenUpD, gradsGen,
comb_inp_list, costs[1], params)
print 'model init done.'
print 'model has keys: ' + ', '.join(modelGen.keys())
# calculate how many iterations we need, One epoch is considered once going through all the sentences and not images
# Hence in case of coco/flickr this will 5* no of images
num_sentences_total = dp.getSplitSize('train', ofwhat = 'images')
num_iters_one_epoch = num_sentences_total / batch_size
max_iters = max_epochs * num_iters_one_epoch
iters_eval= num_iters_one_epoch//2
iters_gen = num_iters_one_epoch//4
eval_period_in_epochs = params['eval_period']
eval_period_in_iters = max(1, int(num_iters_one_epoch * eval_period_in_epochs))
top_val_ppl2 = -1
smooth_train_ppl2 = 0.5 # initially size of dictionary of confusion
val_ppl2 = len(misc['ixtoword'])
last_status_write_time = 0 # for writing worker job status reports
json_worker_status = {}
json_worker_status['params'] = params
json_worker_status['history'] = []
len_hist = defaultdict(int)
t_print_sec = 60
## Initialize the model parameters from the checkpoint file if we are resuming training
if params['checkpoint_file_name'] != 'None':
zipp(model_init_from,modelGen)
#zipp(rg_init,rgGen)
print("\nContinuing training from previous model\n. Already run for %0.2f epochs with validation perplx at %0.3f\n" % (checkpoint_init['epoch'], \
checkpoint_init['perplexity']))
pos_samp = np.arange(batch_size,dtype=np.int32)
print batch_size
##############################################################
# Define signal handler to catch ctl-c or kills so that we can save the model trained till that point
def signal_handler(signal, frame):
print('You pressed Ctrl+C! Saving Checkpoint Now before exiting!')
filename = 'advmodel_checkpoint_%s_%s_%s_%.2f_INT.p' % (params['dataset'], host, params['fappend'], val_ppl2)
dumpCheckpoint(filename, params, modelGen, modelEval, misc, it, val_ppl2)
sys.exit(0)
signal.signal(signal.SIGINT, signal_handler)
##############################################################
for it in xrange(max_epochs):
epoch = it * 1.0 / num_iters_one_epoch
# Enable using dropout in training
use_dropout_eval.set_value(1.)
for it2 in xrange(iters_eval):
t0 = time.time()
# fetch a batch of data
batch,_ = dp.sampPosNegSentSamps(params['eval_batch_size'] - params['rand_negs'])
real_inp_list, lenS = prepare_data(batch, misc['wordtoix'], maxlen=params['maxlen'], pos_samp=pos_samp, prep_for=params['eval_model'], rand_negs = params['rand_negs'])
# evaluate cost, gradient and perform parameter update
cost = f_grad_comp_eval(*real_inp_list)
f_param_update_eval(params['learning_rate_eval'])
dt = time.time() - t0
# Track training statistics
train_ppl2 = (np.e**(-cost)) #step_struct['stats']['ppl2']
smooth_train_ppl2 = 0.99 * smooth_train_ppl2 + 0.01 * train_ppl2 # smooth exponentially decaying moving average
if it2 == 0: smooth_train_ppl2 = train_ppl2
if it2 == 0: smooth_train_cost = cost
else: smooth_train_cost = 0.99 * smooth_train_cost + 0.01 * cost
tnow = time.time()
if tnow > last_status_write_time + t_print_sec*1: # every now and then lets write a report
print 'Eval Cnn in epoch %d: %d/%d sample done in %.3fs. Cost now is %.3f Pplx is %.3f' % (it, it2, iters_eval, dt, \
smooth_train_cost,smooth_train_ppl2)
last_status_write_time = tnow
print 'Done training the descriminative model for now. Switching to Genereative model'
print 'Eval N/W in epoch %d: Cost now is %.3f Pplx is %.3f' % (it, smooth_train_cost,smooth_train_ppl2)
filename = 'advmodel_checkpoint_%s_%s_%s_%d_%.2f_EVOnly.p' % (params['dataset'], host, params['fappend'],it, smooth_train_ppl2)
dumpCheckpoint(filename, params, modelGen, modelEval, misc, it, val_ppl2)
# Disable Cnn dropout while training gen network
use_dropout_eval.set_value(0.)
for it2 in xrange(iters_gen):
t0 = time.time()
# fetch a batch of data
batch,_ = dp.sampPosNegSentSamps(params['eval_batch_size'] - params['rand_negs'])
real_inp_list, lenS = prepare_data(batch, misc['wordtoix'], maxlen=params['maxlen'], pos_samp=pos_samp, prep_for=params['eval_model'], rand_negs = params['rand_negs'])
#import pdb; pdb.set_trace()
# evaluate cost, gradient and perform parameter update
#if any([np.isnan(modelGen[m].get_value()).any() for m in modelGen]):
# print 'Somebodys NAN!!!'
# break;
#asd = f_gen_only(real_inp_list[2],real_inp_list[3])
#print it2,asd[-1].shape, real_inp_list[0].shape
#if asd[-1].shape[0] > real_inp_list[0].shape[0]:
# import pdb; pdb.set_trace()
cost = f_grad_comp_gen(*real_inp_list)
#print it2,cost
#if any([np.isnan(zg_gen[i].get_value()).any() for i in xrange(len(zg_gen))]):
# print 'Somebody zg is NAN!!!'
# break;
#if any([np.isnan(rg_gen[i].get_value()).any() for i in xrange(len(rg_gen))]) or any([(rg_gen[i].get_value()<0).any() for i in xrange(len(rg_gen))]):
# print 'Somebody rg is NAN!!!'
# break;
f_param_update_gen(params['learning_rate_gen'])
dt = time.time() - t0
# print training statistics
train_ppl2 = (np.e**(-cost)) #step_struct['stats']['ppl2']
smooth_train_ppl2 = 0.99 * smooth_train_ppl2 + 0.01 * train_ppl2 # smooth exponentially decaying moving average
if it2 == 0: smooth_train_ppl2 = train_ppl2
if it2 == 0: smooth_train_cost = cost
else: smooth_train_cost = 0.99 * smooth_train_cost + 0.01 * cost
tnow = time.time()
if tnow > last_status_write_time + t_print_sec*1: # every now and then lets write a report
print 'Gen Lstm in epoch %d: %d/%d sample done in %.3fs. Cost now is %.3f Pplx is %.3f' % (it, it2, iters_gen, dt, \
smooth_train_cost,smooth_train_ppl2)
last_status_write_time = tnow
print 'Done training the generative model for now. Switching to Genereative model. Final Stats are:'
print 'Gen Lstm in epoch %d: Cost now is %.3f Pplx is %.3f' % (it, smooth_train_cost,smooth_train_ppl2)
## perform perplexity evaluation on the validation set and save a model checkpoint if it's good
is_last_iter = (it+1) == max_iters
is_last_iter = 1
if (((it+1) % eval_period_in_iters) == 0 and it < max_iters - 5) or is_last_iter:
# Disable using dropout in validation
# use_dropout.set_value(0.)
# val_ppl2 = eval_split_theano('val', dp, model, params, misc,f_eval) # perform the evaluation on VAL set
#
# if it - params['lr_decay_st_epoch'] >= 0:
# params['learning_rate'] = params['learning_rate'] * params['lr_decay']
# params['lr_decay_st_epoch'] += 1
#
# print 'validation perplexity = %f, lr = %f' % (val_ppl2, params['learning_rate'])
# if params['sample_by_len'] == 1:
# print len_hist
val_ppl2 = smooth_train_ppl2
write_checkpoint_ppl_threshold = params['write_checkpoint_ppl_threshold']
if val_ppl2 < top_val_ppl2 or top_val_ppl2 < 0:
if val_ppl2 < write_checkpoint_ppl_threshold or write_checkpoint_ppl_threshold < 0:
# if we beat a previous record or if this is the first time
# AND we also beat the user-defined threshold or it doesnt exist
#top_val_ppl2 = val_ppl2
filename = 'advmodel_checkpoint_%s_%s_%s_%d_%.2f_GenDone.p' % (params['dataset'], host, params['fappend'],it, smooth_train_ppl2)
dumpCheckpoint(filename, params, modelGen, modelEval, misc, it, val_ppl2)
def main(params):
batch_size = params['batch_size']
word_count_threshold = params['word_count_threshold']
max_epochs = params['max_epochs']
host = socket.gethostname() # get computer hostname
#--------------------------------- Init data provider and load data+features #---------------------------------#
# fetch the data provider
dp = getDataProvider(params)
params['aux_inp_size'] = params['featenc_hidden_size'] * params[
'n_encgt_sent'] if params['encode_gt_sentences'] else dp.aux_inp_size
params['featenc_hidden_size'] = params['featenc_hidden_size'] if params[
'encode_gt_sentences'] else params['aux_inp_size']
params['image_feat_size'] = dp.img_feat_size
print 'Image feature size is %d, and aux input size is %d' % (
params['image_feat_size'], params['aux_inp_size'])
#--------------------------------- Preprocess sentences and build Vocabulary #---------------------------------#
misc = {
} # stores various misc items that need to be passed around the framework
# go over all training sentences and find the vocabulary we want to use, i.e. the words that occur
# at least word_count_threshold number of times
if params['checkpoint_file_name'] == 'None':
if params['class_out_factoring'] == 0:
misc['wordtoix'], misc[
'ixtoword'], bias_init_vector = preProBuildWordVocab(
dp.iterSentences('train'), word_count_threshold)
else:
[misc['wordtoix'], misc['classes']
], [misc['ixtoword'], misc['clstotree'], misc['ixtoclsinfo']
], [bias_init_vector, bias_init_inter_class
] = preProBuildWordVocab(dp.iterSentences('train'),
word_count_threshold, params)
params['nClasses'] = bias_init_inter_class.shape[0]
params['ixtoclsinfo'] = misc['ixtoclsinfo']
else:
misc = checkpoint_init['misc']
params['nClasses'] = checkpoint_init['params']['nClasses']
if 'ixtoclsinfo' in misc:
params['ixtoclsinfo'] = misc['ixtoclsinfo']
params['vocabulary_size'] = len(misc['wordtoix'])
params['output_size'] = len(misc['ixtoword']) # these should match though
print len(misc['wordtoix']), len(misc['ixtoword'])
#------------------------------ Initialize the solver/generator and build forward path #-----------------------#
# Initialize the optimizer
solver = Solver(params['solver'])
# This initializes the model parameters and does matrix initializations
lstmGenerator = decodeGenerator(params)
model, misc['update'], misc['regularize'] = (lstmGenerator.model_th,
lstmGenerator.update_list,
lstmGenerator.regularize)
# force overwrite here. The bias to the softmax is initialized to reflect word frequencies
# This is a bit of a hack
if params['checkpoint_file_name'] == 'None':
model['bd'].set_value(bias_init_vector.astype(config.floatX))
if params['class_out_factoring'] == 1:
model['bdCls'].set_value(
bias_init_inter_class.astype(config.floatX))
#----------------- If we are using feature encoders -----------------------
# This mode can now also be used for encoding GT sentences.
if params['use_encoder_for'] & 1:
if params['encode_gt_sentences']:
xI = tensor.zeros((batch_size, params['image_encoding_size']))
imgFeatEnc_inp = []
else:
imgFeatEncoder = RecurrentFeatEncoder(params['image_feat_size'],
params['word_encoding_size'],
params,
mdl_prefix='img_enc_',
features=dp.features.T)
mdlLen = len(model.keys())
model.update(imgFeatEncoder.model_th)
assert (len(model.keys()) == (mdlLen +
len(imgFeatEncoder.model_th.keys())))
misc['update'].extend(imgFeatEncoder.update_list)
misc['regularize'].extend(imgFeatEncoder.regularize)
(imgenc_use_dropout, imgFeatEnc_inp, xI,
updatesLSTMImgFeat) = imgFeatEncoder.build_model(model, params)
else:
xI = None
imgFeatEnc_inp = []
if params['use_encoder_for'] & 2:
aux_enc_inp = model['Wemb'] if params[
'encode_gt_sentences'] else dp.aux_inputs.T
hid_size = params['featenc_hidden_size']
auxFeatEncoder = RecurrentFeatEncoder(hid_size,
params['image_encoding_size'],
params,
mdl_prefix='aux_enc_',
features=aux_enc_inp)
mdlLen = len(model.keys())
model.update(auxFeatEncoder.model_th)
assert (len(model.keys()) == (mdlLen +
len(auxFeatEncoder.model_th.keys())))
misc['update'].extend(auxFeatEncoder.update_list)
misc['regularize'].extend(auxFeatEncoder.regularize)
(auxenc_use_dropout, auxFeatEnc_inp, xAux,
updatesLSTMAuxFeat) = auxFeatEncoder.build_model(model, params)
if params['encode_gt_sentences']:
# Reshape it size(batch_size, n_gt, hidden_size)
xAux = xAux.reshape(
(-1, params['n_encgt_sent'], params['featenc_hidden_size']))
# Convert it to size (batch_size, n_gt*hidden_size
xAux = xAux.flatten(2)
else:
auxFeatEnc_inp = []
xAux = None
#--------------------------------- Initialize the Attention Network #-------------------------------#
if params['use_attn'] != None:
attnModel = AttentionNetwork(params['image_feat_size'],
params['hidden_size'],
params,
mdl_prefix='attn_mlp_')
mdlLen = len(model.keys())
model.update(attnModel.model_th)
assert (len(model.keys()) == (mdlLen + len(attnModel.model_th.keys())))
misc['update'].extend(attnModel.update_list)
misc['regularize'].extend(attnModel.regularize)
attn_nw_func = attnModel.build_model
else:
attn_nw_func = None
#--------------------------------- Build the language model graph #---------------------------------#
# Define the computational graph for relating the input image features and word indices to the
# log probability cost funtion.
(use_dropout, inp_list_gen, f_pred_prob, cost, predTh,
updatesLSTM) = lstmGenerator.build_model(model,
params,
xI,
xAux,
attn_nw=attn_nw_func)
inp_list = imgFeatEnc_inp + auxFeatEnc_inp + inp_list_gen
#--------------------------------- Cost function and gradient computations setup #---------------------------------#
costGrad = cost[0]
# Add class uncertainity to final cost
#if params['class_out_factoring'] == 1:
# costGrad += cost[2]
# Add the regularization cost. Since this is specific to trainig and doesn't get included when we
# evaluate the cost on test or validation data, we leave it here outside the model definition
if params['regc'] > 0.:
reg_cost = theano.shared(numpy_floatX(0.), name='reg_c')
reg_c = tensor.as_tensor_variable(numpy_floatX(params['regc']),
name='reg_c')
reg_cost = 0.
for p in misc['regularize']:
reg_cost += (model[p]**2).sum()
reg_cost *= 0.5 * reg_c
costGrad += (reg_cost / params['batch_size'])
# Compile an evaluation function.. Doesn't include gradients
# To be used for validation set evaluation
f_eval = theano.function(inp_list, cost, name='f_eval')
# Now let's build a gradient computation graph and rmsprop update mechanism
grads = tensor.grad(costGrad, wrt=model.values())
lr = tensor.scalar(name='lr', dtype=config.floatX)
f_grad_shared, f_update, zg, rg, ud = solver.build_solver_model(
lr, model, grads, inp_list, cost, params)
print 'model init done.'
print 'model has keys: ' + ', '.join(model.keys())
#print 'updating: ' + ', '.join( '%s [%dx%d]' % (k, model[k].shape[0], model[k].shape[1]) for k in misc['update'])
#print 'updating: ' + ', '.join( '%s [%dx%d]' % (k, model[k].shape[0], model[k].shape[1]) for k in misc['regularize'])
#print 'number of learnable parameters total: %d' % (sum(model[k].shape[0] * model[k].shape[1] for k in misc['update']), )
#-------------------------------- Intialize the prediction path if needed by evaluator ----------------------------#
evalKwargs = {
'eval_metric': params['eval_metric'],
'f_gen': lstmGenerator.predict,
'beamsize': params['eval_beamsize']
}
if params['eval_metric'] != 'perplex':
lstmGenerator.prepPredictor(None, params, params['eval_beamsize'])
refToks, scr_info = eval_prep_refs('val', dp, params['eval_metric'])
evalKwargs['refToks'] = refToks
evalKwargs['scr_info'] = scr_info
valMetOp = operator.gt
else:
valMetOp = operator.lt
if params['met_to_track'] != []:
trackMetargs = {
'eval_metric': params['met_to_track'],
'f_gen': lstmGenerator.predict,
'beamsize': params['eval_beamsize']
}
lstmGenerator.prepPredictor(None, params, params['eval_beamsize'])
refToks, scr_info = eval_prep_refs('val', dp, params['met_to_track'])
trackMetargs['refToks'] = refToks
trackMetargs['scr_info'] = scr_info
#--------------------------------- Iterations and Logging intializations ------------------------------------------#
# calculate how many iterations we need, One epoch is considered once going through all the sentences and not images
# Hence in case of coco/flickr this will 5* no of images
num_sentences_total = dp.getSplitSize('train', ofwhat='sentences')
num_iters_one_epoch = num_sentences_total / batch_size
max_iters = max_epochs * num_iters_one_epoch
eval_period_in_epochs = params['eval_period']
eval_period_in_iters = max(
1, int(num_iters_one_epoch * eval_period_in_epochs))
top_val_sc = -1
smooth_train_ppl2 = len(
misc['ixtoword']) # initially size of dictionary of confusion
val_sc = len(misc['ixtoword'])
last_status_write_time = 0 # for writing worker job status reports
json_worker_status = {}
#json_worker_status['params'] = params
json_worker_status['history'] = []
len_hist = defaultdict(int)
#Initialize Tracking the perplexity of train and val, with iters.
train_perplex = []
val_perplex = []
trackSc_array = []
#-------------------------------------- Load previously saved model ------------------------------------------------#
#- Initialize the model parameters from the checkpoint file if we are resuming training
if params['checkpoint_file_name'] != 'None':
zipp(model_init_from, model)
if params['restore_grads'] == 1:
zipp(rg_init, rg)
#Copy trackers from previous checkpoint
if 'trackers' in checkpoint_init:
train_perplex = checkpoint_init['trackers']['train_perplex']
val_perplex = checkpoint_init['trackers']['val_perplex']
trackSc_array = checkpoint_init['trackers'].get('trackScores', [])
print(
"""\nContinuing training from previous model\n. Already run for %0.2f epochs with
validation perplx at %0.3f\n""" %
(checkpoint_init['epoch'], checkpoint_init['perplexity']))
#-------------------------------------- MAIN LOOP ----------------------------------------------------------------#
for it in xrange(max_iters):
t0 = time.time()
# Enable using dropout in training
use_dropout.set_value(float(params['use_dropout']))
if params['use_encoder_for'] & 1:
imgenc_use_dropout.set_value(float(params['use_dropout']))
if params['use_encoder_for'] & 2:
auxenc_use_dropout.set_value(float(params['use_dropout']))
epoch = it * 1.0 / num_iters_one_epoch
#-------------------------------------- Prepare batch-------------------------------------------#
# fetch a batch of data
if params['sample_by_len'] == 0:
batch = [dp.sampleImageSentencePair() for i in xrange(batch_size)]
else:
batch, l = dp.getRandBatchByLen(batch_size)
len_hist[l] += 1
enc_inp_list = prepare_seq_features(
batch,
use_enc_for=params['use_encoder_for'],
maxlen=params['maxlen'],
use_shared_mem=params['use_shared_mem_enc'],
enc_gt_sent=params['encode_gt_sentences'],
n_enc_sent=params['n_encgt_sent'],
wordtoix=misc['wordtoix'])
if params['use_pos_tag'] != 'None':
gen_inp_list, lenS = prepare_data(
batch,
misc['wordtoix'],
params['maxlen'],
sentTagMap,
misc['ixtoword'],
rev_sents=params['reverse_sentence'],
use_enc_for=params['use_encoder_for'],
use_unk_token=params['use_unk_token'])
else:
gen_inp_list, lenS = prepare_data(
batch,
misc['wordtoix'],
params['maxlen'],
rev_sents=params['reverse_sentence'],
use_enc_for=params['use_encoder_for'],
use_unk_token=params['use_unk_token'])
if params['sched_sampling_mode'] != None:
gen_inp_list.append(epoch)
real_inp_list = enc_inp_list + gen_inp_list
#import ipdb; ipdb.set_trace()
#---------------------------------- Compute cost and apply gradients ---------------------------#
# evaluate cost, gradient and perform parameter update
cost = f_grad_shared(*real_inp_list)
f_update(params['learning_rate'])
dt = time.time() - t0
# print training statistics
train_ppl2 = (2**(cost[1] / lenS)) #step_struct['stats']['ppl2']
# smooth exponentially decaying moving average
smooth_train_ppl2 = 0.99 * smooth_train_ppl2 + 0.01 * train_ppl2
if it == 0:
smooth_train_ppl2 = train_ppl2 # start out where we start out
total_cost = cost[0]
if it == 0: smooth_cost = total_cost # start out where we start out
smooth_cost = 0.99 * smooth_cost + 0.01 * total_cost
#print '%d/%d batch done in %.3fs. at epoch %.2f. loss cost = %f, reg cost = %f, ppl2 = %.2f (smooth %.2f)' \
# % (it, max_iters, dt, epoch, cost['loss_cost'], cost['reg_cost'], \
# train_ppl2, smooth_train_ppl2)
#---------------------------------- Write a report into a json file ---------------------------#
tnow = time.time()
if tnow > last_status_write_time + 60 * 1: # every now and then lets write a report
print '%d/%d batch done in %.3fs. at epoch %.2f. Cost now is %.3f and pplx is %.3f' \
% (it, max_iters, dt, epoch, smooth_cost, smooth_train_ppl2)
last_status_write_time = tnow
jstatus = {}
jstatus['time'] = datetime.datetime.now().isoformat()
jstatus['iter'] = (it, max_iters)
jstatus['epoch'] = (epoch, max_epochs)
jstatus['time_per_batch'] = dt
jstatus['smooth_train_ppl2'] = smooth_train_ppl2
jstatus['val_sc'] = val_sc # just write the last available one
jstatus['val_metric'] = params[
'eval_metric'] # just write the last available one
jstatus['train_ppl2'] = train_ppl2
#if params['class_out_factoring'] == 1:
# jstatus['class_cost'] = float(cost[2])
json_worker_status['history'].append(jstatus)
status_file = os.path.join(
params['worker_status_output_directory'],
host + '_status.json')
#import pdb; pdb.set_trace()
try:
json.dump(json_worker_status, open(status_file, 'w'))
except Exception, e: # todo be more clever here
print 'tried to write worker status into %s but got error:' % (
status_file, )
print e
#--------------------------------- VALIDATION ---------------------------#
#- perform perplexity evaluation on the validation set and save a model checkpoint if it's good
is_last_iter = (it + 1) == max_iters
if (((it + 1) % eval_period_in_iters) == 0
and it < max_iters - 5) or is_last_iter:
# Disable using dropout in validation
use_dropout.set_value(0.)
if params['use_encoder_for'] & 1:
imgenc_use_dropout.set_value(0.)
if params['use_encoder_for'] & 2:
auxenc_use_dropout.set_value(0.)
# perform the evaluation on VAL set
val_sc = eval_split_theano('val', dp, model, params, misc, f_eval,
**evalKwargs)
val_sc = val_sc[0]
val_perplex.append((it, val_sc))
train_perplex.append((it, smooth_train_ppl2))
if params['met_to_track'] != []:
track_sc = eval_split_theano('val', dp, model, params, misc,
f_eval, **trackMetargs)
trackSc_array.append((it, {
evm: track_sc[i]
for i, evm in enumerate(params['met_to_track'])
}))
if epoch - params['lr_decay_st_epoch'] >= 0:
params['learning_rate'] = params['learning_rate'] * params[
'lr_decay']
params['lr_decay_st_epoch'] += 1
print 'validation %s = %f, lr = %f' % (
params['eval_metric'], val_sc, params['learning_rate'])
#if params['sample_by_len'] == 1:
# print len_hist
#----------------------------- SAVE THE MODEL -------------------#
write_checkpoint_ppl_threshold = params[
'write_checkpoint_ppl_threshold']
if valMetOp(val_sc, top_val_sc) or top_val_sc < 0:
if valMetOp(val_sc, write_checkpoint_ppl_threshold
) or write_checkpoint_ppl_threshold < 0:
# if we beat a previous record or if this is the first time
# AND we also beat the user-defined threshold or it doesnt exist
top_val_sc = val_sc
filename = 'model_checkpoint_%s_%s_%s_%s%.2f.p' % (
params['dataset'], host, params['fappend'],
params['eval_metric'][:3], val_sc)
filepath = os.path.join(
params['checkpoint_output_directory'], filename)
model_npy = unzip(model)
rgrads_npy = unzip(rg)
checkpoint = {}
checkpoint['it'] = it
checkpoint['epoch'] = epoch
checkpoint['model'] = model_npy
checkpoint['rgrads'] = rgrads_npy
checkpoint['params'] = params
checkpoint['perplexity'] = val_sc
checkpoint['misc'] = misc
checkpoint['trackers'] = {
'train_perplex': train_perplex,
'val_perplex': val_perplex,
'trackScores': trackSc_array
}
try:
pickle.dump(checkpoint, open(filepath, "wb"))
print 'saved checkpoint in %s' % (filepath, )
except Exception, e: # todo be more clever here
print 'tried to write checkpoint into %s but got error: ' % (
filepath, )
print e