def train(label2index, index2label):
print("begin of training")
# list of train videos
with open('data/split1.train', 'r') as f:
video_list = f.read().split('\n')[0:-1]
# read train set
dataset = Dataset('data', video_list, label2index)
# train the network
trainer = Trainer(dataset)
print(" Traing trainer\n")
trainer.train(batch_size=512, n_epochs=2, learning_rate=0.1)
#trainer.train(batch_size = 512, n_epochs = 6, learning_rate = 0.01)
# save training model
trainer.save_model('results/net.model')
print("Traing Done")
# estimate prior, loss-based lengths, and monte-carlo grammar
print("Preparing Prior")
prior = estimate_prior(dataset)
mean_lengths = loss_based_lengths(dataset)
grammar = monte_carlo_grammar(dataset, mean_lengths, index2label)
print("Grammar Done")
np.savetxt('results/prior', prior)
np.savetxt('results/mean_lengths', mean_lengths, fmt='%.3f')
with open('results/grammar', 'w') as f:
f.write('\n'.join(grammar) + '\n')
print 'All Done!'
def main(data_root, result_root, split, seed):
result_root += "-s-%d-%d" % (split, seed)
os.makedirs(result_root, exist_ok=True)
### read label2index mapping and index2label mapping ###########################
label2index = dict()
index2label = dict()
# with open('data/mapping.txt', 'r') as f:
with open(os.path.join(data_root, 'mapping.txt'), 'r') as f:
content = f.read().split('\n')[0:-1]
for line in content:
label2index[line.split()[1]] = int(line.split()[0])
index2label[int(line.split()[0])] = line.split()[1]
### read training data #########################################################
print('read data...')
# with open('data/split1.train', 'r') as f:
with open(os.path.join(data_root, 'split%d.train' % split), 'r') as f:
video_list = f.read().split('\n')[0:-1]
dataset = Dataset(data_root, video_list, label2index, shuffle = True)
print('done')
### generate path grammar for inference ########################################
paths = set()
for _, transcript in dataset:
paths.add( ' '.join([index2label[index] for index in transcript]) )
#with open('results/grammar.txt', 'w') as f:
with open(os.path.join(result_root, 'grammar.txt'), 'w') as f:
f.write('\n'.join(paths) + '\n')
### actual nn-viterbi training #################################################
decoder = Viterbi(None, None, frame_sampling = 30, max_hypotheses = np.inf) # (None, None): transcript-grammar and length-model are set for each training sequence separately, see trainer.train(...)
trainer = Trainer(decoder, dataset.input_dimension, dataset.n_classes, buffer_size = len(dataset), buffered_frame_ratio = 25)
learning_rate = 0.01
# train for 10000 iterations
for i in tqdm(range(NUM_ITERS)):
sequence, transcript = dataset.get()
loss = trainer.train(sequence, transcript, batch_size = 512, learning_rate = learning_rate)
# print some progress information
if (i+1) % 100 == 0:
print('Iteration %d, loss: %f' % (i+1, loss))
# save model every 1000 iterations
if (i+1) % 1000 == 0:
print('save snapshot ' + str(i+1))
# network_file = 'results/network.iter-' + str(i+1) + '.net'
network_file = os.path.join(result_root, 'network.iter-' + str(i + 1) + '.net')
# length_file = 'results/lengths.iter-' + str(i+1) + '.txt'
length_file = os.path.join(result_root, 'lengths.iter-' + str(i + 1) + '.txt')
# prior_file = 'results/prior.iter-' + str(i+1) + '.txt'
prior_file = os.path.join(result_root, 'prior.iter-' + str(i + 1) + '.txt')
trainer.save_model(network_file, length_file, prior_file)
# adjust learning rate after 2500 iterations
if (i+1) == 2500:
learning_rate = learning_rate * 0.1
def train(label2index, index2label):
# list of train videos
with open('data/split1.train', 'r') as f:
video_list = f.read().split('\n')[0:-1]
# read train set
print('read data...')
dataset = Dataset('data', video_list, label2index)
print('done')
# train the network
trainer = Trainer(dataset)
trainer.train(batch_size=512, n_epochs=2, learning_rate=0.1)
trainer.save_model('results/net.model')
# estimate prior, loss-based lengths, and monte-carlo grammar
prior = estimate_prior(dataset)
mean_lengths = loss_based_lengths(dataset)
grammar = monte_carlo_grammar(dataset, mean_lengths, index2label)
np.savetxt('results/prior', prior)
np.savetxt('results/mean_lengths', mean_lengths, fmt='%.3f')
with open('results/grammar', 'w') as f:
f.write('\n'.join(grammar) + '\n')
paths.add(' '.join(path))
'''
print(len(paths),count)
#with open(results_path+'grammar.txt', 'w') as f:
# f.write('\n'.join(paths) + '\n')
### actual nn-viterbi training #################################################
decoder = Viterbi(None, None, frame_sampling = 5, max_hypotheses = np.inf) # (None, None): transcript-grammar and length-model are set for each training sequence separately, see trainer.train(...)
trainer = Trainer(decoder, dataset.n_classes, buffer_size = len(dataset), buffered_frame_ratio = 1)
learning_rate = 0.00001
avg_loss=0
# train for 10000 iterations
for i in range(100000):
sequence, transcript = dataset.get()
#print('training',i)
loss = trainer.train(sequence, transcript, batch_size = 1, learning_rate = learning_rate)
avg_loss += loss
# print some progress information
if (i+1) % 10 == 0:
print('Iteration %d, loss: %f Average Loss %f' % (i + 1, loss, avg_loss / (i + 1)))
# save model every 1000 iterations
if (i+1) % 100 == 0:
print('save snapshot ' + str(i+1))
network_file = results_path+'network.iter.net'
length_file = results_path+'lengths.iter.txt'
prior_file = results_path+'prior.iter.txt'
trainer.save_model(network_file, length_file, prior_file)
# adjust learning rate after 2500 iterations
if (i+1) == 5000:
learning_rate = learning_rate * 0.1
) # (None, None): transcript-grammar and length-model are set for each training sequence separately, see trainer.train(...)
trainer = Trainer(decoder,
dataset.input_dimension,
dataset.n_classes,
buffer_size=len(dataset),
buffered_frame_ratio=25)
learning_rate = 0.01
window = 20
step = 5
# train for 100000 iterations
for i in range(100000):
sequence, transcript = dataset.get()
loss1, loss2 = trainer.train(sequence,
transcript,
batch_size=512,
learning_rate=learning_rate,
window=window,
step=step)
# print some progress information
if (i + 1) % 100 == 0:
print('Iteration %d, loss1: %f, loss2: %f, loss: %f' %
(i + 1, loss1, loss2, loss1 - loss2))
# save model every 1000 iterations
if (i + 1) % 1000 == 0:
network_file = 'results/network.iter-' + str(i + 1) + '.net'
length_file = 'results/lengths.iter-' + str(i + 1) + '.txt'
prior_file = 'results/prior.iter-' + str(i + 1) + '.txt'
trainer.save_model(network_file, length_file, prior_file)
# adjust learning rate after 2500 iterations
if (i + 1) == 80000:
learning_rate = learning_rate * 0.1