def main(image_path, decoder_path, encoder_path, vocab_path, embed_size,
hidden_size, num_layers):
# Image preprocessing
transform = transforms.Compose([
transforms.ToTensor(),
transforms.Normalize((0.485, 0.456, 0.406), (0.229, 0.224, 0.225))
])
# Load vocabulary wrapper
with open(vocab_path, 'rb') as f:
vocab = pickle.load(f)
# Build models
encoder = EncoderCNN(
embed_size).eval() # eval mode (batchnorm uses moving mean/variance)
decoder = DecoderRNN(embed_size, hidden_size, len(vocab), num_layers)
encoder = encoder.to(device)
decoder = decoder.to(device)
# Load the trained model parameters
encoder.load_state_dict(torch.load(encoder_path, map_location=device))
decoder.load_state_dict(torch.load(decoder_path, map_location=device))
# Prepare an image
image = load_image(image_path, transform)
image_tensor = image.to(device)
# Generate an caption from the image
feature = encoder(image_tensor)
sampled_ids = decoder.sample(feature)
sampled_ids = sampled_ids[0].cpu().numpy(
) # (1, max_seq_length) -> (max_seq_length)
# Convert word_ids to words
sampled_caption = []
for word_id in sampled_ids:
word = vocab.idx2word[word_id]
sampled_caption.append(word)
if word == '<end>':
break
sentence = ' '.join(sampled_caption)
# Print out the image and the generated caption
print(sentence, "!")
return sentence
def test(image_path, state_path, vocab_path, embed_size, hidden_size,
num_layers, img_size):
transform = transforms.Compose([
transforms.Resize((img_size, img_size)),
transforms.ToTensor(),
transforms.Normalize((0.485, 0.456, 0.406), (0.229, 0.224, 0.225))
])
with open(vocab_path, 'rb') as f:
vocab = pickle.load(f)
# Build models
encoder = EncoderCNN(embed_size).eval()
decoder = DecoderRNN(embed_size, hidden_size, len(vocab), num_layers)
encoder = encoder.to(device)
decoder = decoder.to(device)
# Load the trained model parameters
state = torch.load(state_path, map_location=device)
encoder.load_state_dict(state["encoder"])
decoder.load_state_dict(state["decoder"])
# Prepare an image
image = load_image(image_path, transform)
image_tensor = image.to(device)
# Generate an caption from the image
feature = encoder(image_tensor)
sampled_ids = decoder.sample(feature)
sampled_ids = sampled_ids.cpu().numpy(
) # (1, max_seq_length) -> (max_seq_length)
# Convert word_ids to words
sampled_caption = []
for word_id in sampled_ids:
word = vocab.idx2word[word_id]
sampled_caption.append(word)
if word == '<end>':
break
sentence = ' '.join(sampled_caption)
return sentence
def main(args):
# Image preprocessing, normalization for the pretrained resnet
transform = transforms.Compose([
transforms.Resize((args.crop_size, args.crop_size)),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize((0.485, 0.456, 0.406), (0.229, 0.224, 0.225))
])
# Load vocabulary wrapper
with open(args.vocab_path, 'rb') as f:
vocab = pickle.load(f)
# Build data loader
data_loader = get_loader(args.image_dir,
args.caption_path,
vocab,
args.test_img,
transform,
args.batch_size,
shuffle=True,
num_workers=args.num_workers)
# Build models
encoder = EncoderCNN(args.embed_size).eval(
) # eval mode (batchnorm uses moving mean/variance)
decoder = DecoderRNN(args.embed_size, args.hidden_size, len(vocab),
args.num_layers)
encoder = encoder.to(device)
decoder = decoder.to(device)
# Load the trained model parameters
state = torch.load(state_path, map_location=device)
encoder.load_state_dict(state["encoder"])
decoder.load_state_dict(state["decoder"])
scores = []
# Evaluate the model
total_step = len(data_loader)
for i, (images, captions, lengths) in enumerate(data_loader):
# Set mini-batch dataset
images = images.to(device)
lengths = lengths.to(device)
captions = captions.to(device)
targets = pack_padded_sequence(captions, lengths, batch_first=True)[0]
# Generate an caption from the image
feature = encoder(images)
sampled_ids = decoder.sample(feature)
sampled_ids = sampled_ids.cpu().numpy()
targets_captions = []
captions = captions.cpu().numpy()
for samp in captions:
caption = []
for word_id in samp:
word = vocab.idx2word[word_id]
caption.append(word)
if word == '<end>':
break
targets_captions.append(caption)
# Convert word_ids to words
predicted_captions = []
for samp in sampled_ids:
caption = []
for word_id in samp:
word = vocab.idx2word[word_id]
caption.append(word)
if word == '<end>':
break
predicted_captions.append(caption)
print("targets_captions: ", targets_captions[:20])
print("predicted_captions: ", predicted_captions[:20])
references = [[targets_captions[0]]]
candidates = [predicted_captions[0]]
score = corpus_bleu(references, candidates)
print("references: ", references)
print("candidates: ", candidates)
print(score)
scores.append(score)
print('bleu av: ', sum(scores) / len(scores))
(0.229, 0.224, 0.225))
])
# Build data loader.
data_loader = get_loader(transform=transform_train,
mode='train',
batch_size=batch_size,
vocab_threshold=vocab_threshold,
vocab_from_file=vocab_from_file)
# The size of the vocabulary.
vocab_size = len(data_loader.dataset.vocab)
print(f'Vocabulary size: {vocab_size}')
# Initialize the encoder and decoder.
encoder = EncoderCNN(embed_size)
decoder = DecoderRNN(embed_size, hidden_size, vocab_size)
# Move models to GPU if CUDA is available.
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
encoder.to(device)
decoder.to(device)
# Define the loss function.
criterion = nn.CrossEntropyLoss().cuda() if torch.cuda.is_available(
) else nn.CrossEntropyLoss()
# Specify the learnable parameters of the model.
# Dummy
params = list(decoder.parameters()) + list(encoder.embed.parameters())
def main(args):
# Create model directory
if not os.path.exists(args.model_path):
os.makedirs(args.model_path)
# Image preprocessing, normalization for the pretrained resnet
transform = transforms.Compose([
transforms.Resize((args.crop_size, args.crop_size)),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize((0.485, 0.456, 0.406), (0.229, 0.224, 0.225))
])
# Load vocabulary wrapper
with open(args.vocab_path, 'rb') as f:
vocab = pickle.load(f)
# Build data loader
data_loader = get_loader(args.image_dir,
args.caption_path,
vocab,
args.train_img,
transform,
args.batch_size,
shuffle=True,
num_workers=args.num_workers)
# Build the models
encoder = EncoderCNN(args.embed_size).to(device)
decoder = DecoderRNN(args.embed_size, args.hidden_size, len(vocab),
args.num_layers).to(device)
# TODO: should be done `model.train()`
# Loss and optimizer
criterion = nn.CrossEntropyLoss()
params = list(decoder.parameters()) + list(encoder.classifier.parameters())
optimizer = torch.optim.Adam(params, lr=args.learning_rate)
# Train the models
total_step = len(data_loader)
for epoch in range(args.num_epochs):
for i, (images, captions, lengths) in enumerate(tqdm(data_loader)):
lengths = lengths.to(device)
images = images.to(device)
captions = captions.to(device)
targets = pack_padded_sequence(captions, lengths,
batch_first=True)[0]
# Forward, backward and optimize
features = encoder(images)
outputs = decoder(features, captions, lengths)
loss = criterion(outputs, targets)
optimizer.zero_grad()
loss.backward()
optimizer.step()
# TODO: use `tqdm`
# Print log info
if i % args.log_step == 0:
print(
'Epoch [{}/{}], Step [{}/{}], Loss: {:.4f}, Perplexity: {:5.4f}'
.format(epoch, args.num_epochs, i, total_step, loss.item(),
np.exp(loss.item())))
print('saving weights')
torch.save(
dict(decoder=decoder.state_dict(), encoder=encoder.state_dict()),
os.path.join(args.model_path,
'state-epoch-{}-loss-{}.ckpt'.format(epoch + 1,
loss)))
decoder_path = os.path.join(path, 'trained', 'DecoderLSTM', 'v12', 'decoder-8-final.ckpt')
embedding_size = 512
momentum = 0.0001
hidden_size = 1024
num_layers = 1
max_length = 40
batch_size = 1
num_workers = 0
resize = 224
transforms = transforms.Compose([transforms.Resize(resize), transforms.RandomCrop(resize), transforms.ToTensor(), transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225])])
with open(vocabulary_path, 'rb') as f:
vocabulary = pickle.load(f)
encoder = EncoderCNN(embedding_size, momentum).eval()
decoder = DecoderLSTM(embedding_size, hidden_size, len(vocabulary), num_layers, max_length).eval()
encoder = encoder.to(device)
decoder = decoder.to(device)
encoder.load_state_dict(torch.load(encoder_path))
decoder.load_state_dict(torch.load(decoder_path))
with torch.no_grad():
while True:
source = input('Input the source (online/offline): ')
file_path = ''
if source == 'offline':
filename = input('Input the image's file name: ')
file_path = os.path.join(image_path, filename)
else:
plt.show()
# --- Load Model ---
# Specify the saved models to load.
encoder_file = 'encoder-3.pkl'
decoder_file = 'decoder-3.pkl'
# Select appropriate values for the Python variables below.
embed_size = 512
hidden_size = 256
# The size of the vocabulary.
vocab_size = len(data_loader.dataset.vocab)
# Initialize the encoder and decoder, and set each to inference mode.
encoder = EncoderCNN(embed_size)
encoder.eval()
decoder = DecoderRNN(embed_size, hidden_size, vocab_size)
decoder.eval()
# Load the trained weights.
encoder.load_state_dict(torch.load(os.path.join('./models', encoder_file)))
decoder.load_state_dict(torch.load(os.path.join('./models', decoder_file)))
# Move models to GPU if CUDA is available.
encoder.to(device)
decoder.to(device)
# --- Create Sample Output ---
# Move image Pytorch Tensor to GPU if CUDA is available.
image = image.to(device)
plt.imshow(img_show)
plt.title(caps)
plt.axis('off')
plt.show()
# visualize(train_loader)
# assert len(os.listdir('/train2017')
# ) == train_samples, 'Make sure to have full images in images/train2017'
# prepare training
VOCAB_SIZE = len(train_loader.dataset.vocab)
encoder = EncoderCNN(EMBED_SIZE) # .to(device)
decoder = DecoderRNN(EMBED_SIZE, HIDDEN_SIZE, VOCAB_SIZE) # .to(device)
print('Encoder:\n', encoder)
print('Decoder:\n', decoder)
all_params = list(encoder.linear.parameters()) + \
list(encoder.bn1.parameters()) + list(decoder.parameters())
criterion = nn.CrossEntropyLoss()
optimizer = torch.optim.Adam(params=all_params, lr=1e-05)
total_step = math.ceil(len(train_loader.dataset.cap_len) / BATCH_SIZE)
model_save_path = '/checkpoint'
if not os.path.exists(model_save_path):
os.makedirs(model_save_path, exist_ok=True)