class BertForMultiLabelSequenceClassification(BertPreTrainedModel):
"""BERT model for classification.
This module is composed of the BERT model with a linear layer on top of
the pooled output.
"""
def __init__(self, config, num_labels=4):
super(BertForMultiLabelSequenceClassification, self).__init__(config)
self.num_labels = num_labels
self.bert = BertModel(config)
self.dropout = torch.nn.Dropout(config.hidden_dropout_prob)
self.classifier = torch.nn.Linear(config.hidden_size, num_labels)
self.apply(self.init_bert_weights)
def forward(self, input_ids, token_type_ids=None, attention_mask=None, labels=None):
_, pooled_output = self.bert(input_ids, token_type_ids, attention_mask,
position_ids=None, head_mask=None, output_all_encoded_layers=False)
pooled_output = self.dropout(pooled_output)
logits = self.classifier(pooled_output)
return logits
def freeze_bert_encoder(self):
for param in self.bert.parameters():
param.requires_grad = False
def unfreeze_bert_encoder(self):
for param in self.bert.parameters():
param.requires_grad = True
class BertClassifier(BertPreTrainedModel):
"""
BERT multi-label classifier
"""
def __init__(self, config):
super(BertClassifier, self).__init__(config)
self.bert = BertModel(config)
self.dropout = nn.Dropout(config.hidden_dropout_prob)
self.classifier = nn.Linear(config.hidden_size, config.num_labels)
self.init_weights()
def forward(self, input_ids, token_type_ids=None, attention_mask=None):
"""
Forward pass of the BERT classifier
:param input_ids: the input IDs (bs, seq len)
:param token_type_ids: (not used) a tensor of zeros indicating which sequence in sequence pairs (bs, seq len)
:param attention_mask: tensor of one if not pad token, zero otherwise (bs, seq len)
:return: logits corresponding to each output class (bs, )
"""
_, pooled_output = self.bert(input_ids=input_ids,
token_type_ids=token_type_ids,
attention_mask=attention_mask)
pooled_output = self.dropout(pooled_output)
return self.classifier(pooled_output)
def freeze_bert_encoder(self):
"""
Prevents further backpropagation (used when testing)
"""
for param in self.bert.parameters():
param.requires_grad = False
def unfreeze_bert_encoder(self):
"""
Re-enables backpropagation (used when training)
"""
for param in self.bert.parameters():
param.requires_grad = True
def save(self, path: str):
print('save model parameters to [%s]' % path, file=sys.stderr)
# Only save the model and not the entire pretrained Bert
model_to_save = self.module if hasattr(self, 'module') else self
torch.save(model_to_save.state_dict(), path)
@staticmethod
def load(model_path: str, bert_pretrained_path: str, num_labels: int):
""" Load a fine-tuned model from a file.
@param model_path (str): path to model
"""
state_dict = torch.load(model_path)
model = BertClassifier.from_pretrained(bert_pretrained_path,
state_dict=state_dict,
num_labels=num_labels)
return model
class Teacher(nn.Module):
def __init__(self, pretrained_model, freeze_bert=True, lstm_dim=-1):
super(Teacher, self).__init__()
self.output_dim = len(punctuation_dict)
self.config = BertConfig.from_pretrained(pretrained_model, )
self.bert_layer = BertModel(self.config)
# Freeze bert layers
# if freeze_bert:
for p in self.bert_layer.parameters():
p.requires_grad = False
bert_dim = self.config.hidden_size
if lstm_dim == -1:
hidden_size = bert_dim
else:
hidden_size = lstm_dim
self.lstm = nn.LSTM(input_size=bert_dim,
hidden_size=hidden_size,
num_layers=1,
bidirectional=True)
def forward(self, input_ids, attention_mask):
# if len(x.shape) == 1:
# x = x.view(1, x.shape[0]) # add dummy batch for single sample
# (B, N, E) -> (B, N, E)
out = self.bert_layer(input_ids, attention_mask=attention_mask)
x = out.last_hidden_state
# (B, N, E) -> (N, B, E)
x = torch.transpose(x, 0, 1)
x, (_, _) = self.lstm(x)
# (N, B, E) -> (B, N, E)
x = torch.transpose(x, 0, 1)
x = self.linear(x)
return x, hs[0], hs[6], hs[12]
class BertForLinearSequenceToSequenceProbing(ProteinBertAbstractModel):
"""Bert head for token-level prediction tasks (secondary structure, binding sites)"""
def __init__(self, config):
super().__init__(config)
self.bert = BertModel(config)
self.classify = LinearSequenceToSequenceClassificationHead(
config.hidden_size,
config.num_labels,
ignore_index=-1,
dropout=0.5)
for param in self.bert.parameters():
param.requires_grad = False
self.init_weights()
def forward(self, input_ids, input_mask=None, targets=None):
outputs = self.bert(input_ids, input_mask=input_mask)
sequence_output, pooled_output = outputs[:2]
outputs = self.classify(sequence_output, targets) + outputs[2:]
return outputs
class RCNNModel(BertPreTrainedModel):
def __init__(self, config, num_class):
super(RCNNModel, self).__init__(config)
self.bert = BertModel(config)
for param in self.bert.parameters():
param.requires_grad = True
self.lstm = nn.LSTM(768,
256,
2,
bidirectional=True,
batch_first=True,
dropout=0.1)
self.maxpool = nn.MaxPool1d(512)
self.fc = nn.Linear(512 + 768, num_class)
def forward(self, x, masks):
encoder_out, text_cls = self.bert(input_ids=x, attention_mask=masks)
out, _ = self.lstm(encoder_out)
out = torch.cat((encoder_out, out), 2)
out = F.relu(out)
out = out.permute(0, 2, 1)
# print(out.size())
out = self.maxpool(out)
out = out.squeeze()
out = self.fc(out)
return out
class BertForMultiLabelSequenceClassification(BertPreTrainedModel):
def __init__(self, config, label_emb):
super(BertForMultiLabelSequenceClassification,
self).__init__(config, label_emb=None)
self.num_labels = config.num_labels
self.hidden_size = config.hidden_size
self.label_emb = label_emb
self.bert = BertModel(config)
self.dropout = nn.Dropout(0.1)
self.self_attn = SelfAttention(self.hidden_size, self.num_labels)
self.label_attn = LabelAttention(self.hidden_size, self.num_labels,
self.label_emb)
self.linear = MLinear(self.hidden_size, self.num_labels)
self.init_weights()
def forward(
self,
input_ids=None,
attention_mask=None,
token_type_ids=None,
position_ids=None,
head_mask=None,
inputs_embeds=None,
labels=None,
):
sequence, _ = self.bert(input_ids, attention_mask)
sequence = self.dropout(sequence) # [batch, sequence, hidden_size]
masks = attention_mask != 0 # [batch, sequence]
masks = torch.unsqueeze(masks, 1) # [batch, 1, sequence]
self_attn = self.self_attn(sequence, masks)
label_attn = self.label_attn(sequence, masks)
return self.linear(self_attn, label_attn)
def freeze_bert_encoder(self):
for param in self.bert.parameters():
param.requires_grad = False
def unfreeze_bert_encoder(self):
for param in self.bert.parameters():
param.requires_grad = True
class BertForMultiLabelSequenceClassification(BertPreTrainedModel):
"""BERT model for classification.
This module is composed of the BERT model with a linear layer on top of
the pooled output.
"""
def __init__(self, config):
super(BertForMultiLabelSequenceClassification, self).__init__(config)
self.bert = BertModel(config)
self.dropout = torch.nn.Dropout(config.hidden_dropout_prob)
self.classifier = torch.nn.Linear(config.hidden_size + 128,
config.num_labels)
self.init_weights()
def forward(self,
input_ids,
node_vec,
tfidf,
token_type_ids=None,
attention_mask=None,
position_ids=None,
head_mask=None,
labels=None):
outputs = self.bert(input_ids,
token_type_ids=token_type_ids,
attention_mask=attention_mask,
position_ids=None,
head_mask=None)[0]
outputs = torch.sum(outputs * tfidf.unsqueeze(2), 1)
outputs = torch.cat((outputs, node_vec), 1)
outputs = self.dropout(outputs)
logits = self.classifier(outputs)
return logits
def freeze_bert_encoder(self):
for param in self.bert.parameters():
param.requires_grad = False
def unfreeze_bert_encoder(self):
for param in self.bert.parameters():
param.requires_grad = True
class BaseModel(BertPreTrainedModel):
def __init__(self, config, num_class):
super(BaseModel, self).__init__(config)
self.bert = BertModel(config)
for param in self.bert.parameters():
param.requires_grad = True
self.dropout = nn.Dropout(0.5)
self.fc1 = nn.Linear(768, num_class)
self.init_weights()
def forward(self, x, masks):
encoder_out, text_cls = self.bert(input_ids=x, attention_mask=masks)
x = self.dropout(text_cls)
x = self.fc1(x)
return x
class DPCNNModel(BertPreTrainedModel):
def __init__(self, config, num_class):
super(DPCNNModel, self).__init__(config)
self.bert = BertModel(config)
for param in self.bert.parameters():
param.requires_grad = True
# self.fc = nn.Linear(config.hidden_size, config.num_classes)
self.conv_region = nn.Conv2d(1, 250, (3, 768), stride=1)
self.conv = nn.Conv2d(250, 250, (3, 1), stride=1)
self.max_pool = nn.MaxPool2d(kernel_size=(3, 1), stride=2)
self.padding1 = nn.ZeroPad2d((0, 0, 1, 1)) # top bottom
self.padding2 = nn.ZeroPad2d((0, 0, 0, 1)) # bottom
self.relu = nn.ReLU()
self.fc = nn.Linear(250, num_class)
def forward(self, x, masks):
encoder_out, text_cls = self.bert(input_ids=x, attention_mask=masks)
x = encoder_out.unsqueeze(1) # [batch_size, 1, seq_len, embed]
x = self.conv_region(x) # [batch_size, 250, seq_len-3+1, 1]
x = self.padding1(x) # [batch_size, 250, seq_len, 1]
x = self.relu(x)
x = self.conv(x) # [batch_size, 250, seq_len-3+1, 1]
x = self.padding1(x) # [batch_size, 250, seq_len, 1]
x = self.relu(x)
x = self.conv(x) # [batch_size, 250, seq_len-3+1, 1]
while x.size()[2] > 2:
x = self._block(x)
x = x.squeeze() # [batch_size, num_filters(250)]
x = self.fc(x)
return x
def _block(self, x):
x = self.padding2(x)
px = self.max_pool(x)
x = self.padding1(px)
x = F.relu(x)
x = self.conv(x)
x = self.padding1(x)
x = F.relu(x)
x = self.conv(x)
x = x + px # short cut
return x
def add_enc_adapters(bert_model: BertModel,
config: AdapterConfig) -> BertModel:
# Replace specific layer with adapter-added layer
bert_encoder = bert_model.encoder
for i in range(len(bert_model.encoder.layer)):
bert_encoder.layer[i].attention.output = adapt_bert_self_output(
config)(bert_encoder.layer[i].attention.output)
bert_encoder.layer[i].output = adapt_bert_output(config)(
bert_encoder.layer[i].output)
# Freeze all parameters
for param in bert_model.parameters():
param.requires_grad = False
# Unfreeze trainable parts — layer norms and adapters
for name, sub_module in bert_model.named_modules():
if isinstance(sub_module, (Adapter_func, BertLayerNorm)):
for param_name, param in sub_module.named_parameters():
param.requires_grad = True
return bert_model
class BertABSATagger(BertPreTrainedModel):
def __init__(self, bert_config):
"""
:param bert_config: configuration for bert model
"""
super(BertABSATagger, self).__init__(bert_config)
self.num_labels = bert_config.num_labels
self.tagger_config = TaggerConfig()
self.tagger_config.absa_type = bert_config.absa_type.lower()
if bert_config.tfm_mode == 'finetune':
# initialized with pre-trained BERT and perform finetuning
print("Fine-tuning the pre-trained BERT...")
self.bert = BertModel(bert_config)
else:
raise Exception("Invalid transformer mode %s!!!" %
bert_config.tfm_mode)
self.bert_dropout = nn.Dropout(bert_config.hidden_dropout_prob)
# fix the parameters in BERT and regard it as feature extractor
if bert_config.fix_tfm:
# fix the parameters of the (pre-trained or randomly initialized) transformers during fine-tuning
for p in self.bert.parameters():
p.requires_grad = False
self.tagger = None
if self.tagger_config.absa_type == 'linear':
# hidden size at the penultimate layer
penultimate_hidden_size = bert_config.hidden_size
else:
self.tagger_dropout = nn.Dropout(
self.tagger_config.hidden_dropout_prob)
if self.tagger_config.absa_type == 'lstm':
self.tagger = LSTM(
input_size=bert_config.hidden_size,
hidden_size=self.tagger_config.hidden_size,
bidirectional=self.tagger_config.bidirectional)
elif self.tagger_config.absa_type == 'gru':
self.tagger = GRU(
input_size=bert_config.hidden_size,
hidden_size=self.tagger_config.hidden_size,
bidirectional=self.tagger_config.bidirectional)
elif self.tagger_config.absa_type == 'tfm':
# transformer encoder layer
self.tagger = nn.TransformerEncoderLayer(
d_model=bert_config.hidden_size,
nhead=12,
dim_feedforward=4 * bert_config.hidden_size,
dropout=0.1)
elif self.tagger_config.absa_type == 'san':
# vanilla self attention networks
self.tagger = SAN(d_model=bert_config.hidden_size,
nhead=12,
dropout=0.1)
elif self.tagger_config.absa_type == 'crf':
self.tagger = CRF(num_tags=self.num_labels)
else:
raise Exception('Unimplemented downstream tagger %s...' %
self.tagger_config.absa_type)
penultimate_hidden_size = self.tagger_config.hidden_size
self.classifier = nn.Linear(penultimate_hidden_size,
bert_config.num_labels)
def forward(self,
input_ids,
token_type_ids=None,
attention_mask=None,
labels=None,
position_ids=None,
head_mask=None):
outputs = self.bert(input_ids,
position_ids=position_ids,
token_type_ids=token_type_ids,
attention_mask=attention_mask,
head_mask=head_mask)
# the hidden states of the last Bert Layer, shape: (bsz, seq_len, hsz)
tagger_input = outputs[0]
tagger_input = self.bert_dropout(tagger_input)
#print("tagger_input.shape:", tagger_input.shape)
if self.tagger is None or self.tagger_config.absa_type == 'crf':
# regard classifier as the tagger
logits = self.classifier(tagger_input)
else:
if self.tagger_config.absa_type == 'lstm':
# customized LSTM
classifier_input, _ = self.tagger(tagger_input)
elif self.tagger_config.absa_type == 'gru':
# customized GRU
classifier_input, _ = self.tagger(tagger_input)
elif self.tagger_config.absa_type == 'san' or self.tagger_config.absa_type == 'tfm':
# vanilla self-attention networks or transformer
# adapt the input format for the transformer or self attention networks
tagger_input = tagger_input.transpose(0, 1)
classifier_input = self.tagger(tagger_input)
classifier_input = classifier_input.transpose(0, 1)
else:
raise Exception("Unimplemented downstream tagger %s..." %
self.tagger_config.absa_type)
classifier_input = self.tagger_dropout(classifier_input)
logits = self.classifier(classifier_input)
outputs = (logits, ) + outputs[2:]
if labels is not None:
if self.tagger_config.absa_type != 'crf':
loss_fct = CrossEntropyLoss()
if attention_mask is not None:
active_loss = attention_mask.view(-1) == 1
active_logits = logits.view(-1,
self.num_labels)[active_loss]
active_labels = labels.view(-1)[active_loss]
loss = loss_fct(active_logits, active_labels)
else:
loss = loss_fct(logits.view(-1, self.num_labels),
labels.view(-1))
outputs = (loss, ) + outputs
else:
log_likelihood = self.tagger(inputs=logits,
tags=labels,
mask=attention_mask)
loss = -log_likelihood
outputs = (loss, ) + outputs
return outputs
def main():
parser = argparse.ArgumentParser(
description='Train the individual Transformer model')
parser.add_argument('--dataset_folder', type=str, default='datasets')
parser.add_argument('--dataset_name', type=str, default='zara1')
parser.add_argument('--obs', type=int, default=8)
parser.add_argument('--preds', type=int, default=12)
parser.add_argument('--emb_size', type=int, default=1024)
parser.add_argument('--heads', type=int, default=8)
parser.add_argument('--layers', type=int, default=6)
parser.add_argument('--dropout', type=float, default=0.1)
parser.add_argument('--cpu', action='store_true')
parser.add_argument('--output_folder', type=str, default='Output')
parser.add_argument('--val_size', type=int, default=50)
parser.add_argument('--gpu_device', type=str, default="0")
parser.add_argument('--verbose', action='store_true')
parser.add_argument('--max_epoch', type=int, default=100)
parser.add_argument('--batch_size', type=int, default=256)
parser.add_argument('--validation_epoch_start', type=int, default=30)
parser.add_argument('--resume_train', action='store_true')
parser.add_argument('--delim', type=str, default='\t')
parser.add_argument('--name', type=str, default="zara1")
args = parser.parse_args()
model_name = args.name
try:
os.mkdir('models')
except:
pass
try:
os.mkdir('output')
except:
pass
try:
os.mkdir('output/BERT')
except:
pass
try:
os.mkdir(f'models/BERT')
except:
pass
try:
os.mkdir(f'output/BERT/{args.name}')
except:
pass
try:
os.mkdir(f'models/BERT/{args.name}')
except:
pass
log = SummaryWriter('logs/BERT_%s' % model_name)
log.add_scalar('eval/mad', 0, 0)
log.add_scalar('eval/fad', 0, 0)
try:
os.mkdir(args.name)
except:
pass
device = torch.device("cuda")
if args.cpu or not torch.cuda.is_available():
device = torch.device("cpu")
args.verbose = True
## creation of the dataloaders for train and validation
train_dataset, _ = baselineUtils.create_dataset(args.dataset_folder,
args.dataset_name,
0,
args.obs,
args.preds,
delim=args.delim,
train=True,
verbose=args.verbose)
val_dataset, _ = baselineUtils.create_dataset(args.dataset_folder,
args.dataset_name,
0,
args.obs,
args.preds,
delim=args.delim,
train=False,
verbose=args.verbose)
test_dataset, _ = baselineUtils.create_dataset(args.dataset_folder,
args.dataset_name,
0,
args.obs,
args.preds,
delim=args.delim,
train=False,
eval=True,
verbose=args.verbose)
from transformers import BertTokenizer, BertModel, BertForMaskedLM, BertConfig, AdamW
config = BertConfig(vocab_size=30522,
hidden_size=768,
num_hidden_layers=12,
num_attention_heads=12,
intermediate_size=3072,
hidden_act='relu',
hidden_dropout_prob=0.1,
attention_probs_dropout_prob=0.1,
max_position_embeddings=512,
type_vocab_size=2,
initializer_range=0.02,
layer_norm_eps=1e-12)
model = BertModel(config).to(device)
from individual_TF import LinearEmbedding as NewEmbed, Generator as GeneratorTS
a = NewEmbed(3, 768).to(device)
model.set_input_embeddings(a)
generator = GeneratorTS(768, 2).to(device)
#model.set_output_embeddings(GeneratorTS(1024,2))
tr_dl = torch.utils.data.DataLoader(train_dataset,
batch_size=args.batch_size,
shuffle=True,
num_workers=0)
val_dl = torch.utils.data.DataLoader(val_dataset,
batch_size=args.batch_size,
shuffle=True,
num_workers=0)
test_dl = torch.utils.data.DataLoader(test_dataset,
batch_size=args.batch_size,
shuffle=False,
num_workers=0)
#optim = SGD(list(a.parameters())+list(model.parameters())+list(generator.parameters()),lr=0.01)
#sched=torch.optim.lr_scheduler.StepLR(optim,0.0005)
optim = NoamOpt(
768, 0.1, len(tr_dl),
torch.optim.Adam(list(a.parameters()) + list(model.parameters()) +
list(generator.parameters()),
lr=0,
betas=(0.9, 0.98),
eps=1e-9))
#optim=Adagrad(list(a.parameters())+list(model.parameters())+list(generator.parameters()),lr=0.01,lr_decay=0.001)
epoch = 0
mean = train_dataset[:]['src'][:, :, 2:4].mean((0, 1)) * 0
std = train_dataset[:]['src'][:, :, 2:4].std((0, 1)) * 0 + 1
while epoch < args.max_epoch:
epoch_loss = 0
model.train()
for id_b, batch in enumerate(tr_dl):
optim.optimizer.zero_grad()
r = 0
rot_mat = np.array([[np.cos(r), np.sin(r)],
[-np.sin(r), np.cos(r)]])
inp = ((batch['src'][:, :, 2:4] - mean) / std).to(device)
inp = torch.matmul(inp,
torch.from_numpy(rot_mat).float().to(device))
trg_masked = torch.zeros((inp.shape[0], args.preds, 2)).to(device)
inp_cls = torch.ones(inp.shape[0], inp.shape[1], 1).to(device)
trg_cls = torch.zeros(trg_masked.shape[0], trg_masked.shape[1],
1).to(device)
inp_cat = torch.cat((inp, trg_masked), 1)
cls_cat = torch.cat((inp_cls, trg_cls), 1)
net_input = torch.cat((inp_cat, cls_cat), 2)
position = torch.arange(0, net_input.shape[1]).repeat(
inp.shape[0], 1).long().to(device)
token = torch.zeros(
(inp.shape[0], net_input.shape[1])).long().to(device)
attention_mask = torch.ones(
(inp.shape[0], net_input.shape[1])).long().to(device)
out = model(input_ids=net_input,
position_ids=position,
token_type_ids=token,
attention_mask=attention_mask)
pred = generator(out[0])
loss = F.pairwise_distance(
pred[:, :].contiguous().view(-1, 2),
torch.matmul(
torch.cat(
(batch['src'][:, :, 2:4], batch['trg'][:, :, 2:4]),
1).contiguous().view(-1, 2).to(device),
torch.from_numpy(rot_mat).float().to(device))).mean()
loss.backward()
optim.step()
print("epoch %03i/%03i frame %04i / %04i loss: %7.4f" %
(epoch, args.max_epoch, id_b, len(tr_dl), loss.item()))
epoch_loss += loss.item()
#sched.step()
log.add_scalar('Loss/train', epoch_loss / len(tr_dl), epoch)
with torch.no_grad():
model.eval()
gt = []
pr = []
val_loss = 0
for batch in val_dl:
inp = ((batch['src'][:, :, 2:4] - mean) / std).to(device)
trg_masked = torch.zeros(
(inp.shape[0], args.preds, 2)).to(device)
inp_cls = torch.ones(inp.shape[0], inp.shape[1], 1).to(device)
trg_cls = torch.zeros(trg_masked.shape[0], trg_masked.shape[1],
1).to(device)
inp_cat = torch.cat((inp, trg_masked), 1)
cls_cat = torch.cat((inp_cls, trg_cls), 1)
net_input = torch.cat((inp_cat, cls_cat), 2)
position = torch.arange(0, net_input.shape[1]).repeat(
inp.shape[0], 1).long().to(device)
token = torch.zeros(
(inp.shape[0], net_input.shape[1])).long().to(device)
attention_mask = torch.zeros(
(inp.shape[0], net_input.shape[1])).long().to(device)
out = model(input_ids=net_input,
position_ids=position,
token_type_ids=token,
attention_mask=attention_mask)
pred = generator(out[0])
loss = F.pairwise_distance(
pred[:, :].contiguous().view(-1, 2),
torch.cat(
(batch['src'][:, :, 2:4], batch['trg'][:, :, 2:4]),
1).contiguous().view(-1, 2).to(device)).mean()
val_loss += loss.item()
gt_b = batch['trg'][:, :, 0:2]
preds_tr_b = pred[:, args.obs:].cumsum(1).to(
'cpu').detach() + batch['src'][:, -1:, 0:2]
gt.append(gt_b)
pr.append(preds_tr_b)
gt = np.concatenate(gt, 0)
pr = np.concatenate(pr, 0)
mad, fad, errs = baselineUtils.distance_metrics(gt, pr)
log.add_scalar('validation/loss', val_loss / len(val_dl), epoch)
log.add_scalar('validation/mad', mad, epoch)
log.add_scalar('validation/fad', fad, epoch)
model.eval()
gt = []
pr = []
for batch in test_dl:
inp = ((batch['src'][:, :, 2:4] - mean) / std).to(device)
trg_masked = torch.zeros(
(inp.shape[0], args.preds, 2)).to(device)
inp_cls = torch.ones(inp.shape[0], inp.shape[1], 1).to(device)
trg_cls = torch.zeros(trg_masked.shape[0], trg_masked.shape[1],
1).to(device)
inp_cat = torch.cat((inp, trg_masked), 1)
cls_cat = torch.cat((inp_cls, trg_cls), 1)
net_input = torch.cat((inp_cat, cls_cat), 2)
position = torch.arange(0, net_input.shape[1]).repeat(
inp.shape[0], 1).long().to(device)
token = torch.zeros(
(inp.shape[0], net_input.shape[1])).long().to(device)
attention_mask = torch.zeros(
(inp.shape[0], net_input.shape[1])).long().to(device)
out = model(input_ids=net_input,
position_ids=position,
token_type_ids=token,
attention_mask=attention_mask)
pred = generator(out[0])
gt_b = batch['trg'][:, :, 0:2]
preds_tr_b = pred[:, args.obs:].cumsum(1).to(
'cpu').detach() + batch['src'][:, -1:, 0:2]
gt.append(gt_b)
pr.append(preds_tr_b)
gt = np.concatenate(gt, 0)
pr = np.concatenate(pr, 0)
mad, fad, errs = baselineUtils.distance_metrics(gt, pr)
torch.save(model.state_dict(),
"models/BERT/%s/ep_%03i.pth" % (args.name, epoch))
torch.save(generator.state_dict(),
"models/BERT/%s/gen_%03i.pth" % (args.name, epoch))
torch.save(a.state_dict(),
"models/BERT/%s/emb_%03i.pth" % (args.name, epoch))
log.add_scalar('eval/mad', mad, epoch)
log.add_scalar('eval/fad', fad, epoch)
epoch += 1
ab = 1
class BertEncoder(MetaModule):
"""BERT model as presented in Google's paper and using Hugging Face's code
References:
https://arxiv.org/abs/1810.04805
"""
class Config(BaseConfig):
model_name: Union[str, Path] = 'bert-base-multilingual-cased'
"""Pre-trained BERT model to use."""
use_mismatch_features: bool = False
"""Use Alibaba's mismatch features."""
use_predictor_features: bool = False
"""Use features originally proposed in the Predictor model."""
interleave_input: bool = False
"""Concatenate SOURCE and TARGET without internal padding
(111222000 instead of 111002220)"""
freeze: bool = False
"""Freeze BERT during training."""
use_mlp: bool = True
"""Apply a linear layer on top of BERT."""
hidden_size: int = 100
"""Size of the linear layer on top of BERT."""
scalar_mix_dropout: confloat(ge=0.0, le=1.0) = 0.1
scalar_mix_layer_norm: bool = True
@validator('model_name', pre=True)
def fix_relative_path(cls, v):
if (
v not in BERT_PRETRAINED_MODEL_ARCHIVE_LIST
and v not in DISTILBERT_PRETRAINED_MODEL_ARCHIVE_LIST
):
v = Path(v)
if not v.is_absolute():
v = Path.cwd().joinpath(v)
return v
@validator('use_mismatch_features', 'use_predictor_features', pre=True)
def no_implementation(cls, v):
if v:
raise NotImplementedError('Not yet implemented')
return False
def __init__(
self, vocabs: Dict[str, Vocabulary], config: Config, pre_load_model: bool = True
):
super().__init__(config=config)
if pre_load_model:
self.bert = BertModel.from_pretrained(
self.config.model_name, output_hidden_states=True
)
else:
bert_config = BertConfig.from_pretrained(
self.config.model_name, output_hidden_states=True
)
self.bert = BertModel(bert_config)
self.vocabs = {
const.TARGET: vocabs[const.TARGET],
const.SOURCE: vocabs[const.SOURCE],
}
self.mlp = None
if self.config.use_mlp:
self.mlp = nn.Sequential(
nn.Linear(self.bert.config.hidden_size, self.config.hidden_size),
nn.Tanh(),
)
output_size = self.config.hidden_size
else:
output_size = self.bert.config.hidden_size
self.scalar_mix = ScalarMixWithDropout(
mixture_size=self.bert.config.num_hidden_layers + 1, # +1 for embeddings
do_layer_norm=self.config.scalar_mix_layer_norm,
dropout=self.config.scalar_mix_dropout,
)
self._sizes = {
const.TARGET: output_size,
const.TARGET_LOGITS: output_size,
const.TARGET_SENTENCE: self.bert.config.hidden_size,
const.SOURCE: output_size,
}
self.output_embeddings = self.bert.embeddings.word_embeddings
if self.config.freeze:
for param in self.bert.parameters():
param.requires_grad = False
def load_state_dict(
self,
state_dict: Union[Dict[str, Tensor], Dict[str, Tensor]],
strict: bool = True,
):
try:
keys = super().load_state_dict(state_dict, strict)
except RuntimeError as e:
if "position_ids" in str(e):
# FIXME: hack to get around Transformers 3.1 breaking changes
# https://github.com/huggingface/transformers/issues/6882
self.bert.embeddings._non_persistent_buffers_set.add('position_ids')
keys = super().load_state_dict(state_dict, strict)
self.bert.embeddings._non_persistent_buffers_set.discard('position_ids')
else:
raise e
return keys
@classmethod
def input_data_encoders(cls, config: Config):
return {
const.SOURCE: TransformersTextEncoder(
tokenizer_name=config.model_name, is_source=True
),
const.TARGET: TransformersTextEncoder(tokenizer_name=config.model_name),
}
def size(self, field=None):
if field:
return self._sizes[field]
return self._sizes
def forward(
self,
batch_inputs,
*args,
include_target_logits=False,
include_source_logits=False
):
# BERT gets it's input as a concatenation of both embeddings
# or as an interleave of inputs
if self.config.interleave_input:
merge_input_fn = self.interleave_input
else:
merge_input_fn = self.concat_input
input_ids, token_type_ids, attention_mask = merge_input_fn(
batch_inputs[const.SOURCE],
batch_inputs[const.TARGET],
pad_id=self.vocabs[const.TARGET].pad_id,
)
# hidden_states also includes the embedding layer
# hidden_states[-1] is the last layer
last_hidden_state, pooler_output, hidden_states = self.bert(
input_ids=input_ids,
token_type_ids=token_type_ids,
attention_mask=attention_mask,
)
# TODO: select one of these strategies via cli
# TODO: get a BETTER strategy
features = self.scalar_mix(hidden_states, attention_mask)
# features = sum(hidden_states[-5:-1])
# features = hidden_states[-2]
if self.config.use_mlp:
features = self.mlp(features)
# Build the feature dictionary to be returned to the system
output_features = self.split_outputs(
features, batch_inputs, interleaved=self.config.interleave_input
)
# Convert pieces to tokens
target_features = pieces_to_tokens(
output_features[const.TARGET], batch_inputs[const.TARGET]
)
source_features = pieces_to_tokens(
output_features[const.SOURCE], batch_inputs[const.SOURCE]
)
# sentence_features = pooler_output
sentence_features = last_hidden_state.mean(dim=1)
# Substitute CLS on target side
# target_features[:, 0] = 0
output_features[const.TARGET] = target_features
output_features[const.SOURCE] = source_features
output_features[const.TARGET_SENTENCE] = sentence_features
# Logits for multi-task fine-tuning
if include_target_logits:
output_features[const.TARGET_LOGITS] = torch.einsum(
'vh,bsh->bsv',
self.output_embeddings.weight,
output_features[const.TARGET],
)
if include_source_logits:
output_features[const.SOURCE_LOGITS] = torch.einsum(
'vh,bsh->bsv',
self.output_embeddings.weight,
output_features[const.SOURCE],
)
# Additional features
if self.config.use_mismatch_features:
raise NotImplementedError
return output_features
@staticmethod
def concat_input(source_batch, target_batch, pad_id):
"""Concatenate the target + source embeddings into one tensor.
Return:
concatenation of embeddings, mask of target (as ones) and source
(as zeroes) and concatenation of attention_mask
"""
source_ids = source_batch.tensor
target_ids = target_batch.tensor
source_attention_mask = retrieve_tokens_mask(source_batch)
target_attention_mask = retrieve_tokens_mask(target_batch)
target_types = torch.zeros_like(target_ids)
# zero denotes first sequence
source_types = torch.ones_like(source_ids)
input_ids = torch.cat((target_ids, source_ids), dim=1)
token_type_ids = torch.cat((target_types, source_types), dim=1)
attention_mask = torch.cat(
(target_attention_mask, source_attention_mask), dim=1
)
return input_ids, token_type_ids, attention_mask
@staticmethod
def split_outputs(
features: Tensor, batch_inputs: MultiFieldBatch, interleaved: bool = False
) -> Dict[str, Tensor]:
"""Split features back into sentences A and B.
Args:
features: BERT's output: ``[CLS] target [SEP] source [SEP]``.
Shape of (bs, 1 + target_len + 1 + source_len + 1, 2)
batch_inputs: the regular batch object, containing ``source`` and ``target``
batches
interleaved: whether the concat strategy was interleaved
Return:
dict of tensors for ``source`` and ``target``.
"""
outputs = OrderedDict()
target_lengths = batch_inputs[const.TARGET].lengths
if interleaved:
raise NotImplementedError('interleaving not supported.')
# TODO: fix code below to use the lengths information and not bounds
# if interleaved, shift each source sample by its correspondent length
shift = target_lengths.unsqueeze(-1)
range_vector = torch.arange(
features.size(0), device=features.device
).unsqueeze(1)
target_bounds = batch_inputs[const.TARGET].bounds
target_features = features[range_vector, target_bounds]
# Shift bounds by target length and preserve padding
source_bounds = batch_inputs[const.SOURCE].bounds
m = (source_bounds != -1).long() # for masking out padding (which is -1)
shifted_bounds = (source_bounds + shift) * m + source_bounds * (1 - m)
source_features = features[range_vector, shifted_bounds]
else:
# otherwise, shift all by max_length
# if we'd like to maintain the word pieces we merely select all
target_features = features[:, : target_lengths.max()]
# ignore the target and get the rest
source_features = features[:, target_lengths.max() :]
outputs[const.TARGET] = target_features
# Source doesn't have an init_token (like CLS) and we keep SEP
outputs[const.SOURCE] = source_features
return outputs
# TODO this strategy is not being used, should we keep it?
@staticmethod
def interleave_input(source_batch, target_batch, pad_id):
"""Interleave the source + target embeddings into one tensor.
This means making the input as [batch, target [SEP] source].
Return:
interleave of embds, mask of target (as zeroes) and source (as ones)
and concatenation of attention_mask.
"""
source_ids = source_batch.tensor
target_ids = target_batch.tensor
batch_size = source_ids.size(0)
source_lengths = source_batch.lengths
target_lengths = target_batch.lengths
max_pair_length = source_ids.size(1) + target_ids.size(1)
input_ids = torch.full(
(batch_size, max_pair_length),
pad_id,
dtype=torch.long,
device=source_ids.device,
)
token_type_ids = torch.zeros_like(input_ids)
attention_mask = torch.zeros_like(input_ids)
for i in range(batch_size):
# [CLS] and [SEP] are included in the mask (=1)
# note: source does not have CLS
t_len = target_lengths[i].item()
s_len = source_lengths[i].item()
input_ids[i, :t_len] = target_ids[i, :t_len]
token_type_ids[i, :t_len] = 0
attention_mask[i, :t_len] = 1
input_ids[i, t_len : t_len + s_len] = source_ids[i, :s_len]
token_type_ids[i, t_len : t_len + s_len] = 1
attention_mask[i, t_len : t_len + s_len] = 1
# TODO, why is attention mask 1 for all positions?
return input_ids, token_type_ids, attention_mask
@staticmethod
def get_mismatch_features(logits, target, pred):
# calculate mismatch features and concat them
t_max = torch.gather(logits, -1, target.unsqueeze(-1))
p_max = torch.gather(logits, -1, pred.unsqueeze(-1))
diff_max = t_max - p_max
diff_arg = (target != pred).float().unsqueeze(-1)
mismatch = torch.cat((t_max, p_max, diff_max, diff_arg), dim=-1)
return mismatch
class CSER(BertPreTrainedModel):
""" Span-based model to extract entities """
def __init__(self, config: BertConfig, cls_token: int, entity_types: int,
size_embedding: int, prop_drop: float,
freeze_transformer: bool): # noqa
super(CSER, self).__init__(config)
# BERT model
self.bert = BertModel(config)
# layers
self.entity_classifier = nn.Linear(
config.hidden_size * 2 + size_embedding, entity_types)
self.size_embeddings = nn.Embedding(100, size_embedding)
self.dropout = nn.Dropout(prop_drop)
self._cls_token = cls_token
self._entity_types = entity_types
# weight initialization
self.init_weights()
if freeze_transformer:
print("Freeze transformer weights")
# freeze all transformer weights
for param in self.bert.parameters():
param.requires_grad = False
def _forward_eval(self, encodings: torch.tensor,
context_masks: torch.tensor, entity_masks: torch.tensor,
entity_sizes: torch.tensor, entity_spans: torch.tensor,
entity_sample_masks: torch.tensor): # noqa
# get contextualized token embeddings from last transformer layer
context_masks = context_masks.float()
h = self.bert(input_ids=encodings, attention_mask=context_masks)[0]
# classify entities
size_embeddings = self.size_embeddings(
entity_sizes) # embed entity candidate sizes
entity_clf, entity_spans_pool = self._classify_entities(
encodings, h, entity_masks, size_embeddings)
# apply softmax
entity_clf = torch.softmax(entity_clf, dim=2)
return entity_clf
def _classify_entities(self, encodings, h, entity_masks, size_embeddings):
# max pool entity candidate spans
m = (entity_masks.unsqueeze(-1) == 0).float() * (-1e30)
entity_spans_pool = m + h.unsqueeze(1).repeat(1, entity_masks.shape[1],
1, 1)
entity_spans_pool = entity_spans_pool.max(dim=2)[0]
# get cls token as candidate context representation
entity_ctx = get_token(h, encodings, self._cls_token)
# create candidate representations including context, max pooled span and size embedding
entity_repr = torch.cat([
entity_ctx.unsqueeze(1).repeat(1, entity_spans_pool.shape[1], 1),
entity_spans_pool, size_embeddings
],
dim=2)
entity_repr = self.dropout(entity_repr)
# classify entity candidates
entity_clf = self.entity_classifier(entity_repr)
return entity_clf, entity_spans_pool
def forward(self, *args, **kwargs):
return self._forward_eval(*args, **kwargs)
class SpEER(BertPreTrainedModel):
""" Span-based model to jointly extract entities and relations """
def __init__(self,
config: BertConfig,
cls_token: int,
relation_types: int,
entity_types: int,
size_embedding: int,
prop_drop: float,
freeze_transformer: bool,
max_pairs: int = 100,
encoding_size: int = 200,
feature_enhancer: str = "pass"):
super(SpEER, self).__init__(config)
# BERT model
self.bert = BertModel(config)
# layers
self.encoding_size = encoding_size
self.feature_enhancer = fe.get_feature_enhancer(feature_enhancer)(
config.hidden_size, config.hidden_size)
self.rel_encoder = nn.Linear(
config.hidden_size * 3 + size_embedding * 2, encoding_size)
self.entity_encoder = nn.Linear(
config.hidden_size * 2 + size_embedding, encoding_size)
self.size_embeddings = nn.Embedding(100, size_embedding)
self.dropout = nn.Dropout(prop_drop)
self._cls_token = cls_token
self._relation_types = relation_types
self._entity_types = entity_types
self._max_pairs = max_pairs
# weight initialization
self.init_weights()
if freeze_transformer or feature_enhancer not in {
"pass", "transformer"
}:
print("Freeze transformer weights")
# freeze all transformer weights
for param in self.bert.parameters():
param.requires_grad = False
def _forward_train(self, encodings: torch.tensor,
context_mask: torch.tensor, entity_masks: torch.tensor,
entity_sizes: torch.tensor, relations: torch.tensor,
rel_masks: torch.tensor):
# get contextualized token embeddings from last transformer layer
context_mask = context_mask.float()
h = self.bert(input_ids=encodings, attention_mask=context_mask)[0]
# enhance hidden features
orig_shape = h.shape
h = self.feature_enhancer.prepare_input(h, context_mask)
h = self.feature_enhancer(h)
h = self.feature_enhancer.prepare_output(h, orig_shape)
entity_masks = entity_masks.float()
batch_size = encodings.shape[0]
device = self.entity_encoder.weight.device
# encode and classify entities
size_embeddings = self.size_embeddings(
entity_sizes) # embed entity candidate sizes
entity_encoding, entity_spans_pool = self._encode_entities(
encodings, h, entity_masks, size_embeddings)
entity_clf = self._classify_entities(entity_encoding)
# prepare relation encoding
rel_masks = rel_masks.float().unsqueeze(-1)
h_large = h.unsqueeze(1).repeat(
1, max(min(relations.shape[1], self._max_pairs), 1), 1, 1)
rel_encoding = torch.zeros(
[batch_size, relations.shape[1], self.encoding_size]).to(device)
# obtain relation encodings
# chunk processing to reduce memory usage
for i in range(0, relations.shape[1], self._max_pairs):
# classify relation candidates
rel_encoding_chunk = self._encode_relations(
entity_spans_pool, size_embeddings, relations, rel_masks,
h_large, i)
rel_encoding[:, i:i + self._max_pairs, :] = rel_encoding_chunk
rel_clf = self._classify_relations(rel_encoding)
return entity_clf, rel_clf
def _forward_eval(self,
entity_knn_module,
rel_knn_module,
entity_entries: List[List[Dict]],
type_key: str,
encodings: torch.tensor,
context_mask: torch.tensor,
entity_masks: torch.tensor,
entity_sizes: torch.tensor,
entity_spans: torch.tensor = None,
entity_sample_mask: torch.tensor = None,
verbose=False):
# get contextualized token embeddings from last transformer layer
context_mask = context_mask.float()
h = self.bert(input_ids=encodings, attention_mask=context_mask)[0]
# enhance hidden features
orig_shape = h.shape
h = self.feature_enhancer.prepare_input(h, context_mask)
h = self.feature_enhancer(h)
h = self.feature_enhancer.prepare_output(h, orig_shape)
entity_masks = entity_masks.float()
batch_size = encodings.shape[0]
ctx_size = context_mask.shape[-1]
device = self.entity_encoder.weight.device
# encode and classify entities
size_embeddings = self.size_embeddings(
entity_sizes) # embed entity candidate sizes
entity_encoding, entity_spans_pool = self._encode_entities(
encodings, h, entity_masks, size_embeddings)
entity_encoding_reshaped = entity_encoding.view(
entity_encoding.shape[0] * entity_encoding.shape[1], -1).cpu()
entity_types, entity_neighbors = entity_knn_module.infer_(
entity_encoding_reshaped, int, type_key)
# for i, neighbors in enumerate(entity_neighbors):
# print(entity_types[i], neighbors)
# print neighbor entities
if verbose:
print('*' * 50)
print("entity neighbors:")
entity_entries_flat = []
for entry in entity_entries:
entity_entries_flat += entry
for i, neighbors in enumerate(entity_neighbors):
if entity_types[i] == 0:
continue
print("[ENT] {} >> {}".format(
entity_entries_flat[i]["phrase"].encode('utf-8'),
entity_types[i]))
for j in range(min(len(neighbors), 5)):
n = neighbors[j]
print("\t", n["phrase"].encode('utf-8'), n["type_string"],
n[type_key])
print()
entity_types = torch.tensor(entity_types).view(
entity_encoding.shape[0], entity_encoding.shape[1]).to(device)
entity_clf = torch.zeros([
entity_encoding.shape[0], entity_encoding.shape[1],
self._entity_types
],
dtype=torch.long).to(device)
entity_clf.scatter_(2, entity_types.unsqueeze(2), 1)
# ignore entity candidates that do not constitute an actual entity for relations (based on classifier)
relations, rel_masks, rel_sample_masks, rel_entries = self._filter_spans(
entity_clf, entity_spans, entity_sample_mask, entity_entries,
ctx_size, type_key)
rel_masks = rel_masks.float()
rel_sample_masks = rel_sample_masks.float()
h_large = h.unsqueeze(1).repeat(
1, max(min(relations.shape[1], self._max_pairs), 1), 1, 1)
rel_encoding = torch.zeros(
[batch_size, relations.shape[1], self.encoding_size]).to(device)
# obtain relation encodings
# chunk processing to reduce memory usage
for i in range(0, relations.shape[1], self._max_pairs):
# classify relation candidates
rel_encoding_chunk = self._encode_relations(
entity_spans_pool, size_embeddings, relations, rel_masks,
h_large, i)
rel_encoding[:, i:i + self._max_pairs, :] = rel_encoding_chunk
rel_encoding_reshaped = rel_encoding.view(
rel_encoding.shape[0] * rel_encoding.shape[1], -1).cpu()
# encode and classify relations
rel_types, rel_neighbors = rel_knn_module.infer_(
rel_encoding_reshaped, int, type_key)
# print neighbor relations
if verbose:
print('*' * 50)
rel_entries_flat = []
for entry in rel_entries:
rel_entries_flat += entry
for i, neighbors in enumerate(rel_neighbors):
if rel_types[i] == 0:
continue
print("[REL] {} >> {}".format(
rel_entries_flat[i]["phrase"].encode('utf-8'),
rel_types[i]))
for j in range(min(len(neighbors), 5)):
n = neighbors[j]
print("\t", n["phrase"].encode('utf-8'), n["type_string"],
n[type_key])
print()
rel_types = torch.LongTensor(rel_types).view(
rel_encoding.shape[0], rel_encoding.shape[1]).to(device)
rel_clf = torch.zeros([
rel_encoding.shape[0], rel_encoding.shape[1], self._relation_types
],
dtype=torch.float32).to(device)
rel_clf.scatter_(2, rel_types.unsqueeze(2), 1)
rel_clf = rel_clf[:, :,
1:] # exclude 'none' prediction for multi-label prediction
rel_clf = rel_clf * rel_sample_masks # mask
return entity_clf, rel_clf, relations
def _forward_encode(self, encodings: torch.tensor,
context_mask: torch.tensor, entity_masks: torch.tensor,
entity_sizes: torch.tensor, relations: torch.tensor,
rel_masks: torch.tensor):
# get contextualized token embeddings from last transformer layer
context_mask = context_mask.float()
h = self.bert(input_ids=encodings, attention_mask=context_mask)[0]
entity_masks = entity_masks.float()
batch_size = encodings.shape[0]
device = self.entity_encoder.weight.device
# encode and classify entities
size_embeddings = self.size_embeddings(
entity_sizes) # embed entity candidate sizes
entity_encoding, entity_spans_pool = self._encode_entities(
encodings, h, entity_masks, size_embeddings)
# prepare relation encoding
rel_masks = rel_masks.float().unsqueeze(-1)
h_large = h.unsqueeze(1).repeat(
1, max(min(relations.shape[1], self._max_pairs), 1), 1, 1)
rel_encoding = torch.zeros(
[batch_size, relations.shape[1], self.encoding_size]).to(device)
# obtain relation encodings
# chunk processing to reduce memory usage
for i in range(0, relations.shape[1], self._max_pairs):
# classify relation candidates
rel_encoding_chunk = self._encode_relations(
entity_spans_pool, size_embeddings, relations, rel_masks,
h_large, i)
rel_encoding[:, i:i + self._max_pairs, :] = rel_encoding_chunk
return entity_encoding, rel_encoding
def _classify_entities(self, entity_encoding, verification=False):
# cosine similarities of every possible entity encoding pair in the batch
cosine_similarities = torch.einsum('abc, ijc -> abij', entity_encoding,
entity_encoding)
# einsum verification (at least each element has similarity 1 with itself)
if verification:
with torch.no_grad():
is_close_bools = cosine_similarities.isclose(
torch.tensor([1.00],
device=self.entity_encoder.weight.device))
is_close_sum = is_close_bools.int().sum().item()
assert (is_close_sum >=
entity_encoding.shape[0] * entity_encoding.shape[1])
# normalize cosine similarity from [-1, 1] to [0, 1], and clip float precision errors
normalized_similarities = (cosine_similarities + 1) / 2
normalized_similarities = normalized_similarities.clamp(0, 1)
return normalized_similarities
def _encode_entities(self, encodings, h, entity_masks, size_embeddings):
# max pool entity candidate spans
entity_spans_pool = entity_masks.unsqueeze(-1) * h.unsqueeze(1)
entity_spans_pool = entity_spans_pool.max(dim=2)[0]
# get cls token as candidate context representation
entity_ctx = get_token(h, encodings, self._cls_token)
# create candidate representations including context, max pooled span and size embedding
entity_repr = torch.cat([
entity_ctx.unsqueeze(1).repeat(1, entity_spans_pool.shape[1], 1),
entity_spans_pool, size_embeddings
],
dim=2)
entity_repr = self.dropout(entity_repr)
# encode entity candidates
entity_encoding = self.entity_encoder(entity_repr)
# normalize encoding to unit length for cosine similarity
entity_encoding = f.normalize(entity_encoding, dim=2, p=2)
return entity_encoding, entity_spans_pool
def _classify_relations(self, rel_encoding, verification=False):
# cosine similarity of every possible relation encoding pair in the batch
cosine_similarities = torch.einsum('abc, ijc -> abij', rel_encoding,
rel_encoding)
# einsum verification (at least each element has similarity 1 with itself)
if verification:
with torch.no_grad():
is_close_bools = cosine_similarities.isclose(
torch.tensor([1.00],
device=self.rel_encoder.weight.device))
is_close_sum = is_close_bools.int().sum().item()
assert (is_close_sum >=
rel_encoding.shape[0] * rel_encoding.shape[1])
# normalize cosine similarity from [-1, 1] to [0, 1], and clip float precision errors
normalized_similarities = (cosine_similarities + 1) / 2
normalized_similarities = normalized_similarities.clamp(0, 1)
return normalized_similarities
def _encode_relations(self, entity_spans, size_embeddings, relations,
rel_masks, h, chunk_start):
batch_size = relations.shape[0]
# create chunks if necessary
if relations.shape[1] > self._max_pairs:
relations = relations[:, chunk_start:chunk_start + self._max_pairs]
rel_masks = rel_masks[:, chunk_start:chunk_start + self._max_pairs]
h = h[:, :relations.shape[1], :]
# get pairs of entity candidate representations
entity_pairs = util.batch_index(entity_spans, relations)
entity_pairs = entity_pairs.view(batch_size, entity_pairs.shape[1], -1)
# get corresponding size embeddings
size_pair_embeddings = util.batch_index(size_embeddings, relations)
size_pair_embeddings = size_pair_embeddings.view(
batch_size, size_pair_embeddings.shape[1], -1)
# relation context (context between entity candidate pair)
rel_ctx = rel_masks * h
rel_ctx = rel_ctx.max(dim=2)[0]
# create relation candidate representations including context, max pooled entity candidate pairs
# and corresponding size embeddings
rel_repr = torch.cat([rel_ctx, entity_pairs, size_pair_embeddings],
dim=2)
rel_repr = self.dropout(rel_repr)
# encode relation candidates
rel_encoding = self.rel_encoder(rel_repr)
# normalize encoding to unit length for cosine similarity
rel_encoding = f.normalize(rel_encoding, dim=2, p=2)
return rel_encoding
#TODO: Needs checking of relation entries
def _filter_spans(self, entity_clf, entity_spans, entity_sample_mask,
entity_entries, ctx_size, type_key):
batch_size = entity_clf.shape[0]
entity_logits_max = entity_clf.argmax(
dim=-1) * entity_sample_mask.long(
) # get entity type (including none)
batch_relations = []
batch_rel_masks = []
batch_rel_sample_masks = []
batch_rel_entries = []
for i in range(batch_size):
rels = []
rel_masks = []
sample_masks = []
rel_entries = []
# get spans classified as entities
non_zero_indices = (entity_logits_max[i] != 0).nonzero().view(-1)
non_zero_spans = entity_spans[i][non_zero_indices].tolist()
non_zero_entries = [entity_entries[i][j] for j in non_zero_indices]
non_zero_indices = non_zero_indices.tolist()
# create relations and masks
for n, (i1, s1) in enumerate(zip(non_zero_indices,
non_zero_spans)):
for m, (i2,
s2) in enumerate(zip(non_zero_indices,
non_zero_spans)):
if i1 != i2:
rels.append((i1, i2))
phrase = "|{}| <TBD> |{}|".format(
non_zero_entries[n]["phrase"],
non_zero_entries[m]["phrase"])
rel_entries.append({
"phrase": phrase,
"type_string": "<TBD>",
type_key: -1
})
rel_masks.append(
sampling.create_rel_mask(s1, s2, ctx_size))
sample_masks.append(1)
if not rels:
# case: no more than two spans classified as entities
batch_relations.append(torch.tensor([[0, 0]],
dtype=torch.long))
batch_rel_masks.append(
torch.tensor([[0] * ctx_size], dtype=torch.bool))
batch_rel_sample_masks.append(
torch.tensor([0], dtype=torch.bool))
phrase = ""
batch_rel_entries.append([{
"phrase": phrase,
"type_string": "<TBD>",
type_key: -1
}])
else:
# case: more than two spans classified as entities
batch_relations.append(torch.tensor(rels, dtype=torch.long))
batch_rel_masks.append(torch.stack(rel_masks))
batch_rel_sample_masks.append(
torch.tensor(sample_masks, dtype=torch.bool))
batch_rel_entries.append(rel_entries)
# stack
device = self.rel_encoder.weight.device
batch_relations = util.padded_stack(batch_relations).to(device)
batch_rel_masks = util.padded_stack(batch_rel_masks).to(
device).unsqueeze(-1)
batch_rel_sample_masks = util.padded_stack(batch_rel_sample_masks).to(
device).unsqueeze(-1)
batch_rel_entries = util.padded_entries(batch_rel_entries)
return batch_relations, batch_rel_masks, batch_rel_sample_masks, batch_rel_entries
def forward(self, *args, mode="train", **kwargs):
f_forward = {
"train": self._forward_train,
"eval": self._forward_eval,
"encode": self._forward_encode
}.get(mode)
return f_forward(*args, **kwargs)
class TableF(BertPreTrainedModel):
""" table filling model to jointly extract entities and relations """
def __init__(self, config: BertConfig, tokenizer: BertTokenizer,
relation_labels: int, entity_labels: int,
entity_label_embedding: int, att_hidden: int,
prop_drop: float, freeze_transformer: bool, device):
super(TableF, self).__init__(config)
# BERT model
self.bert = BertModel(config)
self._tokenizer = tokenizer
self._device = device
# layers
self.entity_label_embedding = nn.Embedding(entity_labels , entity_label_embedding)
self.entity_classifier = nn.Linear(config.hidden_size * 2 + entity_label_embedding, entity_labels)
self.rel_classifier = MultiHeadAttention(relation_labels, config.hidden_size + entity_label_embedding, att_hidden , device)
self.dropout = nn.Dropout(prop_drop)
self._relation_labels = relation_labels
self._entity_labels = entity_labels
# weight initialization
self.init_weights()
if freeze_transformer:
print("Freeze transformer weights")
# freeze all transformer weights
for param in self.bert.parameters():
param.requires_grad = False
def _forward_token(self, h: torch.tensor, token_mask: torch.tensor,
gold_seq: torch.tensor, entity_mask: torch.tensor):
num_steps = gold_seq.shape[-1]
word_h = h.repeat(token_mask.shape[0], 1, 1) * token_mask.unsqueeze(-1)
word_h_pooled = word_h.max(dim=1)[0]
word_h_pooled = word_h_pooled[:num_steps+2].contiguous()
word_h_pooled[0,:] = 0
# curr word repr.
curr_word_repr = word_h_pooled[1:-1].contiguous()
# prev entity repr.
prev_entity = torch.tril(entity_mask, diagonal=0)
prev_entity_h = word_h_pooled.repeat(prev_entity.shape[0], 1, 1) * prev_entity.unsqueeze(-1)
prev_entity_pooled = prev_entity_h.max(dim=1)[0]
prev_entity_pooled = prev_entity_pooled[:num_steps].contiguous()
# prev_label_embedding.
prev_seq = torch.cat([torch.tensor([0]).to(self._device), gold_seq])
prev_label = self.entity_label_embedding(prev_seq[:-1])
entity_repr = torch.cat([curr_word_repr - 1, prev_entity_pooled - 1, prev_label], dim=1).unsqueeze(0)
entity_repr = self.dropout(entity_repr)
curr_entity_logits = self.entity_classifier(entity_repr)
return curr_word_repr, curr_entity_logits
def _forward_relation(self, h: torch.tensor, entity_preds: torch.tensor,
entity_mask: torch.tensor, is_eval: bool = False):
entity_labels = entity_preds.unsqueeze(0)
# entity repr.
masks_no_cls_rep = entity_mask[1:-1, 1:-1]
entity_repr = h.repeat(masks_no_cls_rep.shape[-1], 1, 1) * masks_no_cls_rep.unsqueeze(-1)
entity_repr_pool = entity_repr.max(dim=1)[0]
#entity_label repr.
entity_label_embeddings = self.entity_label_embedding(entity_labels)
# entity_label_embeddings = torch.matmul(entity_preds, self.entity_label_embedding.weight)
entity_label_repr = entity_label_embeddings.repeat(masks_no_cls_rep.shape[-1], 1, 1) * masks_no_cls_rep.unsqueeze(-1)
entity_label_pool = entity_label_repr.max(dim=1)[0]
rel_embedding = torch.cat([entity_repr_pool.unsqueeze(0) - 1, entity_label_pool.unsqueeze(0)], dim=2)
rel_embedding = self.dropout(rel_embedding)
rel_logits = self.rel_classifier(rel_embedding, rel_embedding, rel_embedding)
return rel_logits
def _forward_train(self, encodings: torch.tensor, context_mask: torch.tensor,
token_mask: torch.tensor, gold_entity: torch.tensor, entity_masks: List[torch.tensor],
allow_rel: bool):
# get contextualized token embeddings from last transformer layer
context_mask = context_mask.float()
h = self.bert(input_ids=encodings, attention_mask=context_mask)[0] + 1
batch_size = encodings.shape[0]
all_entity_logits = []
all_rel_logits = []
for batch in range(batch_size): # every batch
entity_mask = entity_masks[batch]
word_h, curr_entity_logits = self._forward_token(h[batch], token_mask[batch], gold_entity[batch], entity_mask)
entity_preds = torch.argmax(curr_entity_logits, dim=2)
# entity_preds_soft = torch.softmax(curr_entity_logits, dim=2)
diag_entity_mask = torch.zeros_like(entity_mask, dtype=torch.bool).to(self._device).fill_diagonal_(1)
all_entity_logits.append(curr_entity_logits)
# Relation classification.
num_steps = gold_entity[batch].shape[-1]
word_h = h[batch].repeat(token_mask[batch].shape[0], 1, 1) * token_mask[batch].unsqueeze(-1)
word_h_pooled = word_h.max(dim=1)[0]
word_h_pooled = word_h_pooled[:num_steps+2].contiguous()
# curr word repr.
curr_word_repr = word_h_pooled[1:-1].contiguous()
# curr_rel_logits = self._forward_relation(curr_word_repr, entity_preds_soft , diag_entity_mask)
# curr_rel_logits = self._forward_relation(curr_word_repr, entity_preds.squeeze(0) , diag_entity_mask)
curr_rel_logits = self._forward_relation(curr_word_repr, gold_entity[batch] , entity_masks[batch])
all_rel_logits.append(curr_rel_logits)
if allow_rel:
return all_entity_logits, all_rel_logits
else:
return all_entity_logits, []
def _forward_eval(self, encodings: torch.tensor, context_mask: torch.tensor, token_mask: torch.tensor,
gold_entity: List[torch.tensor], gold_entity_mask: List[torch.tensor]):
context_mask = context_mask.float()
h = self.bert(input_ids=encodings, attention_mask=context_mask)[0] + 1
batch_size = encodings.shape[0]
all_entity_logits = []
all_entity_scores = []
all_entity_preds = []
all_rel_logits = []
for batch in range(batch_size): # every batch
num_steps = token_mask[batch].sum(axis=1).nonzero().shape[0] - 2
word_h = h[batch].repeat(token_mask[batch].shape[0], 1, 1) * token_mask[batch].unsqueeze(-1)
word_h_pooled = word_h.max(dim=1)[0]
word_h_pooled = word_h_pooled[:num_steps+2].contiguous()
word_h_pooled[0,:] = 0
# curr word repr.
curr_word_reprs = word_h_pooled[1:-1].contiguous()
entity_masks = torch.zeros((num_steps + 2, num_steps + 2), dtype = torch.bool).fill_diagonal_(1).to(self._device)
# diag_entity_mask = torch.zeros((num_steps + 2, num_steps + 2), dtype = torch.bool).fill_diagonal_(1).to(self._device)
entity_preds = torch.zeros((num_steps + 1, 1), dtype=torch.long).to(self._device)
entity_logits = []
entity_scores = torch.zeros((num_steps, 1), dtype=torch.float).to(self._device)
# Entity classification.
for i in range(num_steps): # no [CLS], no [SEP]
# curr word repr.
curr_word_repr = curr_word_reprs[i].unsqueeze(0)
# mask from previous entity token until current position.
prev_mask = entity_masks[i, :]
prev_label_repr = self.entity_label_embedding(entity_preds[i])
prev_entity = word_h_pooled.unsqueeze(0) * prev_mask.unsqueeze(-1)
prev_entity_pooled = prev_entity.max(dim=1)[0]
curr_entity_repr = torch.cat([curr_word_repr - 1, prev_entity_pooled - 1, prev_label_repr], dim=1).unsqueeze(0)
curr_entity_logits = self.entity_classifier(curr_entity_repr)
entity_logits.append(curr_entity_logits.squeeze(1))
curr_label = curr_entity_logits.argmax(dim=2).squeeze(0)
# print(i, curr_entity_logits, torch.softmax(curr_entity_logits, dim=2))
entity_scores[i] += torch.softmax(curr_entity_logits, dim=2).max(dim=2)[0].squeeze(0)
entity_preds[i+1] = curr_label
istart = (curr_label % 4 == 1) | (curr_label % 4 == 2) | (curr_label == 0)
# update entity mask for the next time step
entity_masks[i+1] += (~istart) * prev_mask
# update entity span info for all time-steps
entity_masks[prev_mask.nonzero()[0].item():i+1, i+1] += (~istart).squeeze(0)
all_entity_logits.append(torch.stack(entity_logits, dim=1))
all_entity_scores.append(torch.t(entity_scores.squeeze(-1)))
all_entity_preds.append(torch.t(entity_preds[1:].squeeze(-1)))
# print(entity_preds.shape)
# print(gold_entity[batch])
# exit(0)
# Relation classification.
# curr_rel_logits = self._forward_relation(curr_word_reprs, torch.stack(entity_logits, dim=1), entity_masks , True)
curr_rel_logits = self._forward_relation(curr_word_reprs, entity_preds[1:].squeeze(-1), entity_masks, True)
# curr_rel_logits = self._forward_relation(curr_word_reprs, gold_entity[batch], gold_entity_mask[batch], True)
all_rel_logits.append(curr_rel_logits)
return all_entity_logits, all_entity_scores, all_entity_preds, all_rel_logits
def forward(self, *args, evaluate=False, **kwargs):
if not evaluate:
return self._forward_train(*args, **kwargs)
else:
return self._forward_eval(*args, **kwargs)
class SynFueBERT(BertPreTrainedModel):
""" Span-based model to jointly extract terms and relations """
VERSION = '1.1'
def __init__(self,
config: BertConfig,
cls_token: int,
relation_types: int,
term_types: int,
size_embedding: int,
prop_drop: float,
freeze_transformer: bool,
args,
max_pairs: int = 100,
beta: float = 0.3,
alpha: float = 1.0,
sigma: float = 1.0):
super(SynFueBERT, self).__init__(config)
# BERT model
self.bert = BertModel(config)
self.SynFue = Encoder.SynFueEncoder(self.bert, opt=args)
self.cc = cross_attn.CA_module(config.hidden_size,
config.hidden_size,
1,
dropout=1.0)
# layers
self.rel_classifier = nn.Linear(
config.hidden_size * 6 + size_embedding * 2, relation_types)
self.rel_classifier3 = nn.Linear(
config.hidden_size * 6 + size_embedding * 3, relation_types)
self.term_classifier = nn.Linear(
config.hidden_size * 8 + size_embedding, term_types)
self.dep_linear = nn.Linear(config.hidden_size, relation_types)
self.size_embeddings = nn.Embedding(100, size_embedding)
self.dropout = nn.Dropout(prop_drop)
self._cls_token = cls_token
self._relation_types = relation_types
self._term_types = term_types
self._max_pairs = max_pairs
self._beta = beta
self._alpha = alpha
self._sigma = sigma
# weight initialization
self.init_weights()
if freeze_transformer:
print("Freeze transformer weights")
# freeze all transformer weights
for param in self.bert.parameters():
param.requires_grad = False
def _forward_train(self,
encodings: torch.tensor,
context_masks: torch.tensor,
term_masks: torch.tensor,
term_sizes: torch.tensor,
term_spans: torch.tensor,
term_types: torch.tensor,
relations: torch.tensor,
rel_masks: torch.tensor,
simple_graph: torch.tensor,
graph: torch.tensor,
relations3: torch.tensor,
rel_masks3: torch.tensor,
pair_mask: torch.tensor,
pos: torch.tensor = None):
# get contextualized token embeddings from last transformer layer
context_masks = context_masks.float()
h, dep_output = self.SynFue(input_ids=encodings,
input_masks=context_masks,
simple_graph=simple_graph,
graph=graph,
pos=pos)
batch_size = encodings.shape[0]
# classify terms
size_embeddings = self.size_embeddings(
term_sizes) # embed term candidate sizes
term_clf, term_spans_pool = self._classify_terms(
encodings, h, term_masks, size_embeddings)
# classify relations
h_large = h.unsqueeze(1).repeat(
1, max(min(relations.shape[1], self._max_pairs), 1), 1, 1)
rel_clf = torch.zeros(
[batch_size, relations.shape[1],
self._relation_types]).to(self.rel_classifier.weight.device)
# get span representation
# dep_output = [batch size, seq_len, seq_len, feat_dim] -> [batch size, span num, span num, feat_dim]
span_repr, mapping_list = self.get_span_repr(term_spans, term_types,
dep_output)
cross_attn_span = self.cc(
span_repr) # batch size, seq_len, seq_len, feat_dim
# obtain relation logits
# chunk processing to reduce memory usage
for i in range(0, relations.shape[1], self._max_pairs):
# classify relation candidates
chunk_rel_logits, chunk_rel_clf3, chunk_dep_score = self._classify_relations(
cross_attn_span, term_spans_pool, size_embeddings, relations,
rel_masks, h_large, i, relations3, rel_masks3, pair_mask,
mapping_list)
# apply sigmoid
chunk_rel_clf = torch.sigmoid(chunk_rel_logits)
chunk_rel_clf = self._alpha * chunk_rel_clf + self._beta * chunk_rel_clf3 + self._sigma * chunk_dep_score
rel_clf[:, i:i + self._max_pairs, :] = chunk_rel_clf
max_clf = torch.full_like(rel_clf, torch.max(rel_clf).item())
min_clf = torch.full_like(rel_clf, torch.min(rel_clf).item())
inifite = torch.full_like(rel_clf, 1e-18)
rel_clf = torch.div(rel_clf - min_clf + inifite,
max_clf - min_clf + inifite)
return term_clf, rel_clf
def _forward_eval(self,
encodings: torch.tensor,
context_masks: torch.tensor,
term_masks: torch.tensor,
term_sizes: torch.tensor,
term_spans: torch.tensor,
term_sample_masks: torch.tensor,
simple_graph: torch.tensor,
graph: torch.tensor,
pos: torch.tensor = None):
# get contextualized token embeddings from last transformer layer
context_masks = context_masks.float()
h, dep_output = self.SynFue(input_ids=encodings,
input_masks=context_masks,
simple_graph=simple_graph,
graph=graph,
pos=pos)
batch_size = encodings.shape[0]
ctx_size = context_masks.shape[-1]
# classify terms
size_embeddings = self.size_embeddings(
term_sizes) # embed term candidate sizes
term_clf, term_spans_pool = self._classify_terms(
encodings, h, term_masks, size_embeddings)
# ignore term candidates that do not constitute an actual term for relations (based on classifier)
relations, rel_masks, rel_sample_masks, relations3, rel_masks3, \
rel_sample_masks3, pair_mask, span_repr, mapping_list = self._filter_spans(term_clf, term_spans,
term_sample_masks,
ctx_size, dep_output)
rel_sample_masks = rel_sample_masks.float().unsqueeze(-1)
# h = self.rel_bert(input_ids=encodings, attention_mask=context_masks)[0]
h_large = h.unsqueeze(1).repeat(
1, max(min(relations.shape[1], self._max_pairs), 1), 1, 1)
rel_clf = torch.zeros(
[batch_size, relations.shape[1],
self._relation_types]).to(self.rel_classifier.weight.device)
# get span representation
cross_attn_span = self.cc(
span_repr) # batch size, seq_len, seq_len, feat_dim
# obtain relation logits
# chunk processing to reduce memory usage
for i in range(0, relations.shape[1], self._max_pairs):
# classify relation candidates
chunk_rel_logits, chunk_rel_clf3, chunk_dep_score = self._classify_relations(
cross_attn_span, term_spans_pool, size_embeddings, relations,
rel_masks, h_large, i, relations3, rel_masks3, pair_mask,
mapping_list)
# apply sigmoid
chunk_rel_clf = torch.sigmoid(chunk_rel_logits)
chunk_rel_clf = self._alpha * chunk_rel_clf + self._beta * chunk_rel_clf3 + self._sigma * chunk_dep_score
rel_clf[:, i:i + self._max_pairs, :] = chunk_rel_clf
max_clf = torch.full_like(rel_clf, torch.max(rel_clf).item())
min_clf = torch.full_like(rel_clf, torch.min(rel_clf).item())
inifite = torch.full_like(rel_clf, 1e-18)
rel_clf = torch.div(rel_clf - min_clf + inifite,
max_clf - min_clf + inifite)
rel_clf = rel_clf * rel_sample_masks # mask
# apply softmax
term_clf = torch.softmax(term_clf, dim=2)
return term_clf, rel_clf, relations
def _classify_terms(self, encodings, h, term_masks, size_embeddings):
# max pool term candidate spans
m = (term_masks.unsqueeze(-1) == 0).float() * (-1e30)
term_spans_pool = m + h.unsqueeze(1).repeat(1, term_masks.shape[1], 1,
1)
term_spans_pool = term_spans_pool.max(dim=2)[0]
# get cls token as candidate context representation
term_ctx = get_token(h, encodings, self._cls_token)
# get head and tail token representation
m = term_masks.to(dtype=torch.long)
k = torch.tensor(np.arange(0, term_masks.size(-1)), dtype=torch.long)
k = k.unsqueeze(0).unsqueeze(0).repeat(term_masks.size(0),
term_masks.size(1),
1).to(m.device)
mk = torch.mul(m, k) # element-wise multiply
mk_max = torch.argmax(mk, dim=-1, keepdim=True)
mk_min = torch.argmin(mk, dim=-1, keepdim=True)
mk = torch.cat([mk_min, mk_max], dim=-1)
head_tail_rep = get_head_tail_rep(
h, mk) # [batch size, term_num, bert_dim*2)
# create candidate representations including context, max pooled span and size embedding
term_repr = torch.cat([
term_ctx.unsqueeze(1).repeat(1, term_spans_pool.shape[1], 1),
term_spans_pool, size_embeddings, head_tail_rep
],
dim=2)
term_repr = self.dropout(term_repr)
# classify term candidates
term_clf = self.term_classifier(term_repr)
return term_clf, term_spans_pool
def _classify_relations(self, spans_matrix, term_spans_repr,
size_embeddings, relations, rel_masks, h,
chunk_start, relations3, rel_masks3, pair_mask,
rel_to_span):
batch_size = relations.shape[0]
feat_dim = spans_matrix.size(-1)
# create chunks if necessary
if relations.shape[1] > self._max_pairs:
relations = relations[:, chunk_start:chunk_start + self._max_pairs]
rel_masks = rel_masks[:, chunk_start:chunk_start + self._max_pairs]
h = h[:, :relations.shape[1], :]
def get_span_idx(mapping_list, idx1, idx2):
for x in mapping_list:
if idx1 == x[0][0] and idx2 == x[0][1]:
return x[1][0], x[1][1]
batch_dep_score = []
for i in range(batch_size):
rela = relations[i]
dep_score_list = []
r_2_s = rel_to_span[i]
for r in rela:
i1, i2 = r[0].item(), r[1].item()
idx1, idx2 = get_span_idx(r_2_s, i1, i2)
try:
feat = spans_matrix[i][idx1][idx2]
except:
print('Out of bundary', spans_matrix.size(), i, i1, i2)
feat = torch.zeros(feat_dim)
dep_socre = self.dep_linear(feat).item()
dep_score_list.append([dep_socre])
batch_dep_score.append(dep_score_list)
batch_dep_score = torch.sigmoid(
torch.tensor(batch_dep_score).to(device=torch.device(
'cuda' if torch.cuda.is_available() else 'cpu')))
# get pairs of term candidate representations
term_pairs = util.batch_index(term_spans_repr, relations)
term_pairs = term_pairs.view(batch_size, term_pairs.shape[1], -1)
# get corresponding size embeddings
size_pair_embeddings = util.batch_index(size_embeddings, relations)
size_pair_embeddings = size_pair_embeddings.view(
batch_size, size_pair_embeddings.shape[1], -1)
# relation context (context between term candidate pair)
# mask non term candidate tokens
m = ((rel_masks == 0).float() * (-1e30)).unsqueeze(-1)
rel_ctx = m + h
# max pooling
rel_ctx = rel_ctx.max(dim=2)[0]
# set the context vector of neighboring or adjacent term candidates to zero
rel_ctx[rel_masks.to(torch.uint8).any(-1) == 0] = 0
# create relation candidate representations including context, max pooled term candidate pairs
# and corresponding size embeddings
rel_repr = torch.cat([rel_ctx, term_pairs, size_pair_embeddings],
dim=2)
rel_repr = self.dropout(rel_repr)
# classify relation candidates
chunk_rel_logits = self.rel_classifier(rel_repr)
if relations3.shape[1] > self._max_pairs:
relations3 = relations3[:,
chunk_start:chunk_start + self._max_pairs]
# rel_masks3 = rel_masks3[:, chunk_start:chunk_start + self._max_pairs]
p_num = relations3.size(1)
p_tris = relations3.size(2)
relations3 = relations3.view(batch_size, -1, 3)
# get three pairs candidata representations
term_pairs3 = util.batch_index(term_spans_repr, relations3)
term_pairs3 = term_pairs3.view(batch_size, term_pairs3.shape[1], -1)
size_pair_embeddings3 = util.batch_index(size_embeddings, relations3)
size_pair_embeddings3 = size_pair_embeddings3.view(
batch_size, size_pair_embeddings3.shape[1], -1)
rel_repr = torch.cat([term_pairs3, size_pair_embeddings3], dim=2)
rel_repr = self.dropout(rel_repr)
# classify relation candidates
chunk_rel_logits3 = self.rel_classifier3(rel_repr)
chunk_rel_clf3 = chunk_rel_logits3.view(batch_size, p_num, p_tris, -1)
chunk_rel_clf3 = torch.sigmoid(chunk_rel_clf3)
chunk_rel_clf3 = torch.sum(chunk_rel_clf3, dim=2)
chunk_rel_clf3 = torch.sigmoid(chunk_rel_clf3)
return chunk_rel_logits, chunk_rel_clf3, batch_dep_score
def _filter_spans(self, term_clf, term_spans, term_sample_masks, ctx_size,
token_repr):
batch_size = term_clf.shape[0]
feat_dim = token_repr.size(-1)
term_logits_max = term_clf.argmax(dim=-1) * term_sample_masks.long(
) # get term type (including none)
batch_relations = []
batch_rel_masks = []
batch_rel_sample_masks = []
batch_relations3 = []
batch_rel_masks3 = []
batch_rel_sample_masks3 = []
batch_pair_mask = []
batch_span_repr = []
batch_rel_to_span = []
for i in range(batch_size):
rels = []
rel_masks = []
sample_masks = []
rels3 = []
rel_masks3 = []
sample_masks3 = []
span_repr = []
rel_to_span = []
# get spans classified as terms
non_zero_indices = (term_logits_max[i] != 0).nonzero().view(-1)
non_zero_spans = term_spans[i][non_zero_indices].tolist()
non_zero_indices = non_zero_indices.tolist()
# create relations and masks
pair_mask = []
for idx1, (i1,
s1) in enumerate(zip(non_zero_indices, non_zero_spans)):
temp = []
for idx2, (i2, s2) in enumerate(
zip(non_zero_indices, non_zero_spans)):
if i1 != i2:
rels.append((i1, i2))
rel_masks.append(
sampling.create_rel_mask(s1, s2, ctx_size))
sample_masks.append(1)
p_rels3 = []
p_masks3 = []
for i3, s3 in zip(non_zero_indices, non_zero_spans):
if i1 != i2 and i1 != i3 and i2 != i3:
p_rels3.append((i1, i2, i3))
p_masks3.append(
sampling.create_rel_mask3(
s1, s2, s3, ctx_size))
sample_masks3.append(1)
if len(p_rels3) > 0:
rels3.append(p_rels3)
rel_masks3.append(p_masks3)
pair_mask.append(1)
else:
rels3.append([(i1, i2, 0)])
rel_masks3.append([
sampling.create_rel_mask3(
s1, s2, (0, 0), ctx_size)
])
pair_mask.append(0)
rel_to_span.append([[i1, i2], [idx1, idx2]])
feat = torch.max(
token_repr[i, s1[0]:s1[-1] + 1,
s2[0]:s2[-1] + 1, :].contiguous().view(
-1, feat_dim),
dim=0)[0]
temp.append(feat)
span_repr.append(temp)
if not rels:
# case: no more than two spans classified as terms
batch_relations.append(torch.tensor([[0, 0]],
dtype=torch.long))
batch_rel_masks.append(
torch.tensor([[0] * ctx_size], dtype=torch.bool))
batch_rel_sample_masks.append(
torch.tensor([0], dtype=torch.bool))
batch_span_repr.append(
torch.tensor([[[0] * feat_dim]], dtype=torch.float))
batch_rel_to_span.append([[[0, 0], [0, 0]]])
else:
# case: more than two spans classified as terms
batch_relations.append(torch.tensor(rels, dtype=torch.long))
batch_rel_masks.append(torch.stack(rel_masks))
batch_rel_sample_masks.append(
torch.tensor(sample_masks, dtype=torch.bool))
batch_span_repr.append(
torch.stack([torch.stack(x) for x in span_repr]))
batch_rel_to_span.append(rel_to_span)
if not rels3:
batch_relations3.append(
torch.tensor([[[0, 0, 0]]], dtype=torch.long))
batch_rel_masks3.append(
torch.tensor([[0] * ctx_size], dtype=torch.bool))
batch_rel_sample_masks3.append(
torch.tensor([0], dtype=torch.bool))
batch_pair_mask.append(torch.tensor([0], dtype=torch.bool))
else:
max_tri = max([len(x) for x in rels3])
# print(max_tri)
for idx, r in enumerate(rels3):
r_len = len(r)
if r_len < max_tri:
rels3[idx].extend([rels3[idx][0]] * (max_tri - r_len))
rel_masks3[idx].extend([rel_masks3[idx][0]] *
(max_tri - r_len))
batch_relations3.append(torch.tensor(rels3, dtype=torch.long))
batch_rel_masks3.append(
torch.stack([torch.stack(x) for x in rel_masks3]))
batch_rel_sample_masks3.append(
torch.tensor(sample_masks3, dtype=torch.bool))
batch_pair_mask.append(
torch.tensor(pair_mask, dtype=torch.bool))
# stack
device = self.rel_classifier.weight.device
batch_relations = util.padded_stack(batch_relations).to(device)
batch_rel_masks = util.padded_stack(batch_rel_masks).to(device)
batch_rel_sample_masks = util.padded_stack(batch_rel_sample_masks).to(
device)
batch_span_repr = util.padded_stack(batch_span_repr).to(device)
batch_relations3 = util.padded_stack(batch_relations3).to(device)
batch_rel_masks3 = util.padded_stack(batch_rel_masks3).to(device)
batch_rel_sample_masks3 = util.padded_stack(
batch_rel_sample_masks3).to(device)
batch_pair_mask = util.padded_stack(batch_pair_mask).to(device)
return batch_relations, batch_rel_masks, batch_rel_sample_masks, \
batch_relations3, batch_rel_masks3, batch_rel_sample_masks3, batch_pair_mask, batch_span_repr, batch_rel_to_span
def get_span_repr(self, term_spans, term_types, token_repr):
"""
:param term_spans: [batch size, span_num, 2]
:param term_types: [batch size, span_num]
:param token_repr: [batch size, seq_len, seq_len, feat_dim]
:return: [batch size, span_num, span_num, feat_dim]
"""
batch_size = term_spans.size(0)
feat_dim = token_repr.size(-1)
batch_span_repr = []
batch_mapping_list = []
for i in range(batch_size):
span_repr = []
mapping_list = []
# get target spans as aspect term or opinion term
non_zero_indices = (term_types[i] != 0).nonzero().view(-1)
non_zero_spans = term_spans[i][non_zero_indices].tolist()
non_zero_indices = non_zero_indices.tolist()
for x1, (i1, s1) in enumerate(zip(non_zero_indices,
non_zero_spans)):
temp = []
for x2, (i2,
s2) in enumerate(zip(non_zero_indices,
non_zero_spans)):
feat = torch.max(
token_repr[i, s1[0]:s1[-1] + 1,
s2[0]:s2[-1] + 1, :].contiguous().view(
-1, feat_dim),
dim=0)[0]
temp.append(feat)
mapping_list.append([[i1, i2], [x1, x2]])
span_repr.append(torch.stack(temp))
batch_span_repr.append(torch.stack(span_repr))
batch_mapping_list.append(mapping_list)
device = self.rel_classifier.weight.device
batch_span_repr = util.padded_stack(batch_span_repr).to(device)
return batch_span_repr, batch_mapping_list
def forward(self, *args, evaluate=False, **kwargs):
if not evaluate:
return self._forward_train(*args, **kwargs)
else:
return self._forward_eval(*args, **kwargs)
class DocumentBert(BertPreTrainedModel):
def __init__(self, bert_model_config: BertConfig):
super(DocumentBert, self).__init__(bert_model_config)
self.bert_patent = BertModel(bert_model_config)
self.bert_tsd = BertModel(bert_model_config)
for param in self.bert_patent.parameters():
param.requires_grad = False
for param in self.bert_tsd.parameters():
param.requires_grad = False
self.bert_batch_size = self.bert_patent.config.bert_batch_size
self.dropout_patent = torch.nn.Dropout(
p=bert_model_config.hidden_dropout_prob)
self.dropout_tsd = torch.nn.Dropout(
p=bert_model_config.hidden_dropout_prob)
self.lstm_patent = torch.nn.LSTM(bert_model_config.hidden_size,
bert_model_config.hidden_size)
self.lstm_tsd = torch.nn.LSTM(bert_model_config.hidden_size,
bert_model_config.hidden_size)
self.output = torch.nn.Linear(bert_model_config.hidden_size * 2,
out_features=1)
def forward(self,
patent_batch: torch.Tensor,
tsd_batch: torch.Tensor,
device='cuda'):
#patent
bert_output_patent = torch.zeros(
size=(patent_batch.shape[0],
min(patent_batch.shape[1], self.bert_batch_size),
self.bert_patent.config.hidden_size),
dtype=torch.float,
device=device)
for doc_id in range(patent_batch.shape[0]):
bert_output_patent[
doc_id][:self.bert_batch_size] = self.dropout_patent(
self.bert_patent(
patent_batch[doc_id][:self.bert_batch_size, 0],
token_type_ids=patent_batch[doc_id]
[:self.bert_batch_size, 1],
attention_mask=patent_batch[doc_id]
[:self.bert_batch_size, 2])[1])
output_patent, (_, _) = self.lstm_patent(
bert_output_patent.permute(1, 0, 2))
last_layer_patent = output_patent[-1]
#tsd
bert_output_tsd = torch.zeros(size=(tsd_batch.shape[0],
min(tsd_batch.shape[1],
self.bert_batch_size),
self.bert_tsd.config.hidden_size),
dtype=torch.float,
device=device)
for doc_id in range(tsd_batch.shape[0]):
bert_output_tsd[doc_id][:self.bert_batch_size] = self.dropout_tsd(
self.bert_tsd(
tsd_batch[doc_id][:self.bert_batch_size, 0],
token_type_ids=tsd_batch[doc_id][:self.bert_batch_size, 1],
attention_mask=tsd_batch[doc_id][:self.bert_batch_size,
2])[1])
output_tsd, (_, _) = self.lstm_tsd(bert_output_tsd.permute(1, 0, 2))
last_layer_tsd = output_tsd[-1]
x = torch.cat([last_layer_patent, last_layer_tsd], dim=1)
prediction = torch.nn.functional.sigmoid(self.output(x))
assert prediction.shape[0] == patent_batch.shape[0]
return prediction
def freeze_bert_encoder(self):
for param in self.bert_patent.parameters():
param.requires_grad = False
for param in self.bert_tsd.parameters():
param.requires_grad = False
def unfreeze_bert_encoder(self):
for param in self.bert_patent.parameters():
param.requires_grad = True
for param in self.bert_tsd.parameters():
param.requires_grad = True
def unfreeze_bert_encoder_last_layers(self):
for name, param in self.bert_patent.named_parameters():
if "encoder.layer.11" in name or "pooler" in name:
param.requires_grad = True
for name, param in self.bert_tsd.named_parameters():
if "encoder.layer.11" in name or "pooler" in name:
param.requires_grad = True
def unfreeze_bert_encoder_pooler_layer(self):
for name, param in self.bert_patent.named_parameters():
if "pooler" in name:
param.requires_grad = True
for name, param in self.bert_tsd.named_parameters():
if "pooler" in name:
param.requires_grad = True
class Bert(nn.Module):
def __init__(self, config, num=0):
super(Bert, self).__init__()
model_config = BertConfig()
model_config.vocab_size = config.vocab_size
# 计算loss的方法
self.loss_method = config.loss_method
self.multi_drop = config.multi_drop
self.bert = BertModel(model_config)
if config.requires_grad:
for param in self.bert.parameters():
param.requires_grad = True
self.dropout = nn.Dropout(config.hidden_dropout_prob)
self.hidden_size = config.hidden_size[num]
if self.loss_method in ['binary', 'focal_loss', 'ghmc']:
self.classifier = nn.Linear(self.hidden_size, 1)
else:
self.classifier = nn.Linear(self.hidden_size, self.num_labels)
self.classifier.apply(self._init_weights)
self.bert.apply(self._init_weights)
def _init_weights(self, module):
""" Initialize the weights """
if isinstance(module, (nn.Linear, nn.Embedding)):
# Slightly different from the TF version which uses truncated_normal for initialization
# cf https://github.com/pytorch/pytorch/pull/5617
module.weight.data.normal_(mean=0.0, std=0.02)
def forward(self,
input_ids=None,
token_type_ids=None,
attention_mask=None,
labels=None):
outputs = self.bert(input_ids,
attention_mask=attention_mask,
token_type_ids=token_type_ids)
pooled_output = outputs[1]
out = None
loss = 0
for i in range(self.multi_drop):
output = self.dropout(pooled_output)
if labels is not None:
if i == 0:
out = self.classifier(output)
loss = compute_loss(out,
labels,
loss_method=self.loss_method)
else:
temp_out = self.classifier(output)
temp_loss = compute_loss(temp_out,
labels,
loss_method=self.loss_method)
out = out + temp_out
loss = loss + temp_loss
loss = loss / self.multi_drop
out = out / self.multi_drop
if self.loss_method in ['binary']:
out = torch.sigmoid(out).flatten()
return out, loss
class MyBertForSequenceClassification(BertPreTrainedModel):
num_labels = 4
num_tasks = 20
def __init__(self, config):
super(MyBertForSequenceClassification, self).__init__(config)
self.num_labels = MyBertForSequenceClassification.num_labels
self.num_tasks = MyBertForSequenceClassification.num_tasks
self.bert = BertModel(config)
self.dropout = nn.Dropout(config.hidden_dropout_prob)
# 创建20个分类任务，每个任务共享输入： BertModel 的输出最后一层的 [CLS] 的 pooler_output
# 但是源程序也说了，使用 [cls] 的 pooler_output is usually *not* a good summary
# of the semantic content of the input, you're often better with averaging or pooling
# the sequence of hidden-states for the whole input sequence.
# module_list = []
# for _ in range(self.num_tasks):
# module_list.append(nn.Linear(config.hidden_size, self.num_labels))
# self.classifier = nn.ModuleList(module_list)
self.classifier = nn.ModuleList([
nn.Linear(config.hidden_size, self.num_labels)
for _ in range(self.num_tasks)
])
self.init_weights()
def forward(self,
input_ids,
token_type_ids=None,
attention_mask=None,
labels=None):
"""forward
:param input_ids:
:param labels: 给定的形式是 [batch, num_tasks]
"""
outputs = self.bert(input_ids,
attention_mask=attention_mask,
token_type_ids=token_type_ids)
pooled_output = outputs[1]
pooled_output = self.dropout(pooled_output)
# logits = []
# for i in range(self.num_tasks):
# logits.append(self.classifier[i](pooled_output))
logits = [
self.classifier[i](pooled_output) for i in range(self.num_tasks)
]
if labels is not None:
loss_fct = nn.CrossEntropyLoss()
# 这个要放在gpu 上，很容易遗忘，从而 loss.backward()的时候出错
loss = torch.tensor([0.]).to(device)
for i in range(self.num_tasks):
loss += loss_fct(logits[i], labels[:, i])
return loss
else:
# 用于 验证集和测试集 标签的预测, 维度是[num_tasks, batch, num_labels]
logits = [logit.cpu().numpy() for logit in logits]
return torch.tensor(logits)
# 可以选择 冻结 BertModel 中的参数，也可以不冻结，在 multiLabels classification 中不冻结,不调用该函数即可。这里给出了一个冻结的示范
def freeze_bert_encoder(self):
for param in self.bert.parameters():
param.requires_grad = False
def unfreeze_bert_encoder(self):
for param in self.bert.parameters():
param.requires_grad = True
class SpET(BertPreTrainedModel):
""" Span-based model to extract entities """
def __init__(self,
config: BertConfig,
cls_token: int,
relation_types: int,
entity_types: int,
size_embedding: int,
prop_drop: float,
freeze_transformer: bool,
max_pairs: int = 100,
feature_enhancer: str = "pass"):
super(SpET, self).__init__(config)
# BERT model
self.bert = BertModel(config)
# layers
self.feature_enhancer = fe.get_feature_enhancer(feature_enhancer)(
config.hidden_size, config.hidden_size)
self.entity_classifier = nn.Linear(
config.hidden_size * 2 + size_embedding, entity_types)
self.size_embeddings = nn.Embedding(100, size_embedding)
self.dropout = nn.Dropout(prop_drop)
self._cls_token = cls_token
self._entity_types = entity_types
self._max_pairs = max_pairs
# weight initialization
self.init_weights()
if freeze_transformer or feature_enhancer not in {
"pass", "transformer"
}:
print("Freeze transformer weights")
# freeze all transformer weights
for param in self.bert.parameters():
param.requires_grad = False
def _forward_train(self, encodings: torch.tensor,
context_mask: torch.tensor, entity_masks: torch.tensor,
entity_sizes: torch.tensor):
# get contextualized token embeddings from last transformer layer
context_mask = context_mask.float()
h_bert = self.bert(input_ids=encodings, attention_mask=context_mask)[0]
# enhance hidden features
orig_shape = h_bert.shape
h = self.feature_enhancer.prepare_input(h_bert, context_mask)
h = self.feature_enhancer(h)
h = self.feature_enhancer.prepare_output(h, orig_shape)
entity_masks = entity_masks.float()
batch_size = encodings.shape[0]
# classify entities
size_embeddings = self.size_embeddings(
entity_sizes) # embed entity candidate sizes
entity_clf, entity_spans_pool = self._classify_entities(
encodings, h, entity_masks, size_embeddings)
return entity_clf
def _forward_eval(self,
encodings: torch.tensor,
context_mask: torch.tensor,
entity_masks: torch.tensor,
entity_sizes: torch.tensor,
entity_spans: torch.tensor = None,
entity_sample_mask: torch.tensor = None):
# get contextualized token embeddings from last transformer layer
context_mask = context_mask.float()
h = self.bert(input_ids=encodings, attention_mask=context_mask)[0]
# enhance hidden features
orig_shape = h.shape
h = self.feature_enhancer.prepare_input(h, context_mask)
h = self.feature_enhancer(h)
h = self.feature_enhancer.prepare_output(h, orig_shape)
entity_masks = entity_masks.float()
batch_size = encodings.shape[0]
ctx_size = context_mask.shape[-1]
# classify entities
size_embeddings = self.size_embeddings(
entity_sizes) # embed entity candidate sizes
entity_clf, entity_spans_pool = self._classify_entities(
encodings, h, entity_masks, size_embeddings)
# apply softmax
entity_clf = torch.softmax(entity_clf, dim=2)
return entity_clf
def _classify_entities(self, encodings, h, entity_masks, size_embeddings):
# max pool entity candidate spans
entity_spans_pool = entity_masks.unsqueeze(-1) * h.unsqueeze(1)
entity_spans_pool = entity_spans_pool.max(dim=2)[0]
# get cls token as candidate context representation
entity_ctx = get_token(h, encodings, self._cls_token)
# create candidate representations including context, max pooled span and size embedding
entity_repr = torch.cat([
entity_ctx.unsqueeze(1).repeat(1, entity_spans_pool.shape[1], 1),
entity_spans_pool, size_embeddings
],
dim=2)
entity_repr = self.dropout(entity_repr)
# classify entity candidates
entity_clf = self.entity_classifier(entity_repr)
return entity_clf, entity_spans_pool
def forward(self, *args, evaluate=False, **kwargs):
if not evaluate:
return self._forward_train(*args, **kwargs)
else:
return self._forward_eval(*args, **kwargs)
class ExampleIntentBertModel(torch.nn.Module):
def __init__(self,
model_name_or_path: str,
dropout: float,
num_intent_labels: int,
use_observers: bool = False):
super(ExampleIntentBertModel, self).__init__()
#self.bert_model = BertModel.from_pretrained(model_name_or_path)
self.bert_model = BertModel(
BertConfig.from_pretrained(model_name_or_path,
output_attentions=True))
self.dropout = Dropout(dropout)
self.num_intent_labels = num_intent_labels
self.use_observers = use_observers
self.all_outputs = []
def encode(self, input_ids: torch.tensor, attention_mask: torch.tensor,
token_type_ids: torch.tensor):
extended_attention_mask = attention_mask.unsqueeze(1).unsqueeze(
2).repeat(1, 1, input_ids.size(1), 1)
extended_attention_mask = extended_attention_mask.to(
dtype=next(self.bert_model.parameters()).dtype)
# Combine attention maps
padding = (input_ids.unsqueeze(1) == 0).unsqueeze(-1)
padding = padding.repeat(1, 1, 1, padding.size(-2))
extended_attention_mask = (1.0 - extended_attention_mask) * -10000.0
embedding_output = self.bert_model.embeddings(
input_ids, position_ids=None, token_type_ids=token_type_ids)
encoder_outputs = self.bert_model.encoder(
embedding_output,
extended_attention_mask,
head_mask=[None] * self.bert_model.config.num_hidden_layers)
if encoder_outputs[0].size(0) == 1:
pass
#self.all_outputs.append(torch.cat(encoder_outputs[1], dim=0).cpu())
#self.all_outputs.append(encoder_outputs[0][:, -20:].cpu())
sequence_output = encoder_outputs[0]
if self.use_observers:
pooled_output = sequence_output[:, -20:].mean(dim=1)
else:
pooled_output = self.bert_model.pooler(sequence_output)
return pooled_output
def forward(self, input_ids: torch.tensor, attention_mask: torch.tensor,
token_type_ids: torch.tensor, intent_label: torch.tensor,
example_input: torch.tensor, example_mask: torch.tensor,
example_token_types: torch.tensor,
example_intents: torch.tensor):
example_pooled_output = self.encode(input_ids=example_input,
attention_mask=example_mask,
token_type_ids=example_token_types)
pooled_output = self.encode(input_ids=input_ids,
attention_mask=attention_mask,
token_type_ids=token_type_ids)
pooled_output = self.dropout(pooled_output)
probs = torch.softmax(pooled_output.mm(example_pooled_output.t()),
dim=-1)
intent_probs = 1e-6 + torch.zeros(
probs.size(0), self.num_intent_labels).cuda().scatter_add(
-1,
example_intents.unsqueeze(0).repeat(probs.size(0), 1), probs)
# Compute losses if labels provided
if intent_label is not None:
loss_fct = NLLLoss()
intent_lp = torch.log(intent_probs)
intent_loss = loss_fct(intent_lp.view(-1, self.num_intent_labels),
intent_label.type(torch.long))
else:
intent_loss = torch.tensor(0)
return intent_probs, intent_loss
class BertClassification(BertPreTrainedModel):
def __init__(self, config, freeze_bert = False):
super(BertClassification, self).__init__(config)
self.hidden_size = config.hidden_size
#self.lstm_hidden_size = 256
self.hidden_dropout_prob = config.hidden_dropout_prob
self.num_labels = config.num_labels
self.bert = BertModel(config)
if freeze_bert:
for p in self.bert.parameters():
p.requires_grad = False
self.dropout = nn.Dropout(self.hidden_dropout_prob)
#self.bilstm = nn.LSTM(self.hidden_size, self.lstm_hidden_size, bidirectional=True, batch_first=True)
self.classifier = nn.Linear(self.hidden_size, self.num_labels)
#self.classifier = nn.Linear(self.hidden_size, self.num_labels)
def forward(
self,
input_ids=None,
attention_mask=None,
token_type_ids=None,
position_ids=None,
head_mask=None,
inputs_embeds=None,
labels=None,
output_attentions=None,
output_hidden_states=None,
):
r"""
labels (:obj:`torch.LongTensor` of shape :obj:`(batch_size,)`, `optional`):
Labels for computing the sequence classification/regression loss. Indices should be in :obj:`[0, ...,
config.num_labels - 1]`. If :obj:`config.num_labels == 1` a regression loss is computed (Mean-Square loss),
If :obj:`config.num_labels > 1` a classification loss is computed (Cross-Entropy).
"""
outputs = self.bert(
input_ids,
attention_mask=attention_mask,
token_type_ids=token_type_ids,
position_ids=position_ids,
head_mask=head_mask,
inputs_embeds=inputs_embeds,
output_attentions=output_attentions,
output_hidden_states=output_hidden_states,
)
#pooled_output = outputs[1]
hidden_states = outputs[0]
pooled_output = hidden_states.mean(-2)
pooled_output = self.dropout(pooled_output)
#hidden_states = self.dropout(hidden_states)
#lstm_hidden_states, _ = self.bilstm(hidden_states)
#lstm_hidden_states = self.dropout(lstm_hidden_states)
#pooled_output = lstm_hidden_states.mean(-2)
logits = self.classifier(pooled_output)
loss = None
if labels is not None:
if self.num_labels == 1:
# We are doing regression
loss_fct = MSELoss()
loss = loss_fct(logits.view(-1), labels.view(-1))
else:
loss_fct = CrossEntropyLoss()
loss = loss_fct(logits.view(-1, self.num_labels), labels.view(-1))
output = (logits,) + outputs[2:]
return ((loss,) + output) if loss is not None else output
class BertSum(pl.LightningModule):
def __init__(self, conf=None):
super().__init__()
# save conf, accessible in self.hparams.conf
self.save_hyperparameters()
# MODEL
self.bert = BertModel.from_pretrained('bert-base-uncased')
# change hidden layers from 12 to 10 (memory limit)
bert_config = BertConfig(self.bert.config.vocab_size, num_hidden_layers=10)
self.bert = BertModel(bert_config)
# change embeddings to enable longer input sequences
pos_embeddings = nn.Embedding(self.hparams.conf.dataset.setup.max_length_input_context, self.bert.config.hidden_size)
pos_embeddings.weight.data[:512] = self.bert.embeddings.position_embeddings.weight.data
pos_embeddings.weight.data[512:] = self.bert.embeddings.position_embeddings.weight.data[-1][None, :].repeat(self.hparams.conf.dataset.setup.max_length_input_context - 512, 1)
self.bert.embeddings.position_embeddings = pos_embeddings
# classification layers
self.linear1 = nn.Linear(self.bert.config.hidden_size, 1)
self.sigmoid = nn.Sigmoid()
# TODO: model to encode answer (and fix)
# metrics
self.evaluation_metrics = torch.nn.ModuleDict({
'train_metrics': self._init_metrics(mode='train'),
'val_metrics': self._init_metrics(mode='val'),
'test_metrics': self._init_metrics(mode='test'), })
# loss
self.loss = nn.BCEWithLogitsLoss(reduction='sum')
def forward(self, x, **kwargs):
return self.bert(x, **kwargs)
# optimizer
def configure_optimizers(self):
params = list(self.bert.parameters()) + list(self.linear1.parameters())
return torch.optim.Adam(params, lr=self.hparams.conf.training.lr)
# TRAIN
def training_step(self, batch, batch_idx):
loss, metrics = self._get_loss(batch)
self.log('train_loss', loss, on_step=True, on_epoch=True, prog_bar=True, logger=True)
metrics = self._log_metrics(metrics, mode='train')
return {'loss': loss, **metrics}
def validation_step(self, batch, batch_idx):
loss, metrics = self._get_loss(batch, mode='val')
self.log('val_loss', loss, on_step=False, on_epoch=True, prog_bar=True, logger=True)
metrics = self._log_metrics(metrics, mode='val')
return {'val_loss': loss, **metrics}
def _get_loss(self, batch, mode='train'):
src_ids, src_mask, seg_ids, seg_idx, seg_idx_mask, tgt_labels = batch['input_ids'], batch['input_attention_mask'], batch['segment_ids'], batch['segment_idx'], batch['segment_idx_mask'], batch['target_labels']
position_ids = torch.tensor(list(range(self.hparams.conf.dataset.setup.max_length_input_context))).to('cuda')
# bert
last_hidden_state, pooler_output = self.bert(src_ids, attention_mask=src_mask, token_type_ids=seg_ids, position_ids=position_ids)
# select sentence representation embeddings
seg_idx = seg_idx.unsqueeze(dim=2).repeat(1, 1, last_hidden_state.shape[-1])
sent_embeddings = last_hidden_state.gather(dim=1, index=seg_idx)
# filter mask
mask_idx = torch.nonzero(seg_idx_mask, as_tuple=True)
sent_embeddings = sent_embeddings[mask_idx[0], mask_idx[1], :]
tgt_labels = tgt_labels[mask_idx[0], mask_idx[1]]
# classifier
logits = self.linear1(sent_embeddings)
logits = logits.squeeze().float()
# loss
tgt_labels = tgt_labels.float()
loss = self.loss(logits, tgt_labels)
loss = loss / torch.sum(seg_idx_mask)
# metrics
preds = self.sigmoid(logits)
preds = torch.stack([1 - preds, preds], dim=1)
metrics = self._get_metrics(preds, tgt_labels, mode)
return loss, metrics
def validation_epoch_end(self, outputs):
metrics = self._compute_metrics(mode='val')
self._log_precision_recall_curve(metrics)
self._log_confusion_matrix(metrics)
# TEST
def test_step(self, batch, batch_idx):
loss, metrics = self._get_loss(batch, mode='test')
self.log('test_loss', loss, on_step=False, on_epoch=True, prog_bar=True, logger=True)
metrics = self._log_metrics(metrics, mode='test')
return {'test_loss': loss, **metrics}
def test_epoch_end(self, outputs):
metrics = self._compute_metrics(mode='test')
self._log_confusion_matrix(metrics)
# progress bar
def get_progress_bar_dict(self):
tqdm_dict = super().get_progress_bar_dict()
if 'v_num' in tqdm_dict:
del tqdm_dict['v_num']
return tqdm_dict
# METRICS
def _log_metrics(self, metrics, mode):
metrics = {key + (f'_{mode}' if mode != 'train' else ''): value for key, value in metrics.items() if key != 'confusion_matrix' and key != 'precision_recall_curve'}
for k, m in metrics.items():
self.log(k, m, on_step=False, on_epoch=True, prog_bar=True, logger=True)
return metrics
def _log_precision_recall_curve(self, metrics):
precision, recall, thresholds = metrics['precision_recall_curve']
plt.plot(recall.cpu().numpy(), precision.cpu().numpy(), 'ro')
plt.xlabel('recall')
plt.ylabel('precision')
self.logger.experiment.log({f'precision_recall_curve_{self.current_epoch}': wandb.Image(plt)})
plt.clf()
f1 = 2 * (precision * recall) / (precision + recall)
data = {
'precision': precision.cpu().numpy().tolist(),
'recall': recall.cpu().numpy().tolist(),
'f1': f1.cpu().numpy().tolist(),
'thresholds': thresholds.cpu().numpy().tolist(),
'argmax': torch.argmax(f1).cpu().numpy().tolist()
}
with open(f'precision_recall_{self.current_epoch}', 'wb') as file:
pickle.dump(data, file)
def _log_confusion_matrix(self, metrics):
confusion_matrix = metrics['confusion_matrix']
heatmap = sns.heatmap(confusion_matrix.cpu().numpy(), annot=True, fmt='g')
figure = heatmap.get_figure()
self.logger.experiment.log({f'confusion_matrix_{self.current_epoch}': wandb.Image(figure)})
plt.clf()
def _get_metrics(self, prediction, target, mode='train'):
metrics = {}
for name, metric in self.evaluation_metrics[mode + '_metrics'].items():
metrics[name] = metric(prediction, target)
return metrics
def _compute_metrics(self, mode='train'):
metrics = {}
for name, metric in self.evaluation_metrics[mode + '_metrics'].items():
metrics[name] = metric.compute()
return metrics
@staticmethod
def _init_metrics(mode):
metrics = torch.nn.ModuleDict({
'accuracy': pl.metrics.Accuracy(),
'f1': F1(),
'precision': Precision(),
'recall': Recall(),
})
if mode != 'train':
metrics['confusion_matrix'] = pl.metrics.ConfusionMatrix(num_classes=2)
metrics['precision_recall_curve'] = pl.metrics.PrecisionRecallCurve(pos_label=1)
return metrics
class HIBERT(BertPreTrainedModel):
def __init__(self,
config,
n_classes,
add_linear=None,
attn_bias=False,
freeze_layer_count=-1):
super(HIBERT, self).__init__(config)
self.n_classes = n_classes
self.add_linear = add_linear
self.attn_bias = attn_bias
self.freeze_layer_count = freeze_layer_count
self.attn_weights = None
# Define model objects
self.bert = BertModel(config, add_pooling_layer=False)
self.fc_in_size = self.bert.config.hidden_size
# Control layer freezing
if freeze_layer_count == -1:
# freeze all bert layers
for param in self.bert.parameters():
param.requires_grad = False
if freeze_layer_count == -2:
# unfreeze all bert layers
for param in self.bert.parameters():
param.requires_grad = True
if freeze_layer_count > 0:
# freeze embedding layer
for param in self.bert.embeddings.parameters():
param.requires_grad = False
# freeze the top `freeze_layer_count` encoder layers
for layer in self.bert.encoder.layer[:freeze_layer_count]:
for param in layer.parameters():
param.requires_grad = False
# Attention pooling layer
self.attention = Attention(dim=self.bert.config.hidden_size, attn_bias=self.attn_bias)
# fully connected layers
if self.add_linear is None:
self.fc = nn.ModuleList([nn.Linear(self.fc_in_size, self.n_classes)])
else:
self.fc_layers = [self.fc_in_size] + self.add_linear
self.fc = nn.ModuleList([
LinearBlock(self.fc_layers[i], self.fc_layers[i+1])
for i in range(len(self.fc_layers) - 1)
])
# no relu after last dense (cannot use LinearBlock)
self.fc.append(nn.Linear(self.fc_layers[-1], self.n_classes))
def forward(self, input_ids, attention_mask, n_chunks):
# Bert transformer (take sequential output)
output, _ = self.bert(
input_ids = input_ids,
attention_mask = attention_mask,
return_dict=False
)
# group chunks together
chunks = output.split_with_sizes(n_chunks.tolist())
# loop through attention layer (need a loop as there are different sized chunks)
# collect attention output and attention weights for each call of attention
after_attn_list = []
self.attn_weights = []
for chunk in chunks:
after_attn_list.append(self.attention(chunk.view(1, -1, self.bert.config.hidden_size)))
self.attn_weights.append(self.attention.attn_weights)
output = torch.cat(after_attn_list)
# fully connected layers
for fc in self.fc:
output = fc(output)
return output
class UnStructuredModel:
def __init__(self, model_name, max_length, stride):
self.model_name = model_name
self.tokenizer = None
self.model = None
self.max_length = max_length
self.stride = stride
if model_name == 'bert-base-uncased':
configuration = BertConfig()
self.tokenizer = BertTokenizer.from_pretrained(self.model_name)
self.model = BertModel(configuration).from_pretrained(self.model_name)
self.model.to(device)
self.model.eval()
for param in self.model.parameters():
param.requires_grad = False
#self.model.bert.embeddings.requires_grad = False
def padTokens(self, tokens):
if len(tokens)<self.max_length:
tokens = tokens + ["[PAD]" for i in range(self.max_length - len(tokens))]
return tokens
def getEmbedding(self, text, if_pool=True, pooling_type="mean", batchsize = 1):
tokens = self.tokenizer.tokenize(text)
tokenized_array = self.tokenizeText(tokens)
embeddingTensorsList = []
print(len(tokenized_array))
tensor = torch.zeros([1, 768], device=device)
count = 0
if len(tokenized_array)>batchsize:
for i in range(0, len(tokenized_array), batchsize):
current_tokens = tokenized_array[i:min(i+batchsize,len(tokenized_array))]
token_ids = torch.tensor(current_tokens).to(device)
seg_ids=[[0 for _ in range(len(tokenized_array[0]))] for _ in range(len(current_tokens))]
seg_ids = torch.tensor(seg_ids).to(device)
hidden_reps, cls_head = self.model(token_ids, token_type_ids = seg_ids)
cls_head.to(device)
clas_head = cls_head.detach
if if_pool and pooling_type=="mean":
tensor = tensor.add(torch.sum(cls_head, dim=0))
count +=cls_head.shape[0]
else:
embeddingTensorsList.append(cls_head)
del cls_head, hidden_reps
if if_pool and pooling_type=="mean" and count>0:
embedding = torch.div(tensor, count)
elif not if_pool:
embedding = torch.cat(embeddingTensorsList, dim=0)
else:
raise NotImplementedError()
else:
token_ids = torch.tensor(tokenized_array).to(device)
seg_ids=[[0 for _ in range(len(tokenized_array[0]))] for _ in range(len(tokenized_array))]
seg_ids = torch.tensor(seg_ids).to(device)
hidden_reps, cls_head = self.model(token_ids, token_type_ids = seg_ids)
cls_head.to(device)
cls_head.requires_grad = False
if if_pool and pooling_type=="mean":
embedding = torch.div(torch.sum(cls_head, dim=0), cls_head.shape[0])
elif not if_pool:
embedding = cls_head
else:
raise NotImplementedError()
del cls_head, hidden_reps
return embedding
def tokenizeText(self, tokens):
tokens_array = []
#window_movement_tokens = max_length - stride
for i in range(0, len(tokens), self.stride):
if i+self.max_length<len(tokens):
curr_tokens = ["[CLS]"] + tokens[i:i+self.max_length] + ["[SEP]"]
else:
padded_tokens = self.padTokens(tokens[i:i+self.max_length])
curr_tokens = ["[CLS]"] + padded_tokens + ["[SEP]"]
curr_tokens = self.tokenizer.convert_tokens_to_ids(curr_tokens)
tokens_array.append(curr_tokens)
return tokens_array
def train(config, bert_config, train_path, dev_path, rel2id, id2rel,
tokenizer):
if os.path.exists(config.output_dir) is False:
os.makedirs(config.output_dir, exist_ok=True)
if os.path.exists('./data/train_file.pkl'):
train_data = pickle.load(open("./data/train_file.pkl", mode='rb'))
else:
train_data = data.load_data(train_path, tokenizer, rel2id, num_rels)
pickle.dump(train_data, open("./data/train_file.pkl", mode='wb'))
dev_data = json.load(open(dev_path))
for sent in dev_data:
data.to_tuple(sent)
data_manager = data.SPO(train_data)
train_sampler = RandomSampler(data_manager)
train_data_loader = DataLoader(data_manager,
sampler=train_sampler,
batch_size=config.batch_size,
drop_last=True)
num_train_steps = int(
len(data_manager) / config.batch_size) * config.max_epoch
if config.bert_pretrained_model is not None:
logger.info('load bert weight')
Bert_model = BertModel.from_pretrained(config.bert_pretrained_model,
config=bert_config)
else:
logger.info('random initialize bert model')
Bert_model = BertModel(config=bert_config).init_weights()
Bert_model.to(device)
submodel = sub_model(config).to(device)
objmodel = obj_model(config).to(device)
loss_fuc = nn.BCELoss(reduction='none')
params = list(Bert_model.parameters()) + list(
submodel.parameters()) + list(objmodel.parameters())
optimizer = AdamW(params, lr=config.lr)
# Train!
logger.info("***** Running training *****")
logger.info(" Num examples = %d", len(data_manager))
logger.info(" Num Epochs = %d", config.max_epoch)
logger.info(" Total train batch size = %d", config.batch_size)
logger.info(" Total optimization steps = %d", num_train_steps)
logger.info(" Logging steps = %d", config.print_freq)
logger.info(" Save steps = %d", config.save_freq)
global_step = 0
Bert_model.train()
submodel.train()
objmodel.train()
for _ in range(config.max_epoch):
optimizer.zero_grad()
epoch_itorator = tqdm(train_data_loader, disable=None)
for step, batch in enumerate(epoch_itorator):
batch = tuple(t.to(device) for t in batch)
input_ids, segment_ids, input_masks, sub_positions, sub_heads, sub_tails, obj_heads, obj_tails = batch
bert_output = Bert_model(input_ids, input_masks, segment_ids)[0]
pred_sub_heads, pred_sub_tails = submodel(
bert_output) # [batch_size, seq_len, 1]
pred_obj_heads, pred_obj_tails = objmodel(bert_output,
sub_positions)
# 计算loss
mask = input_masks.view(-1)
# loss1
sub_heads = sub_heads.unsqueeze(-1) # [batch_szie, seq_len, 1]
sub_tails = sub_tails.unsqueeze(-1)
loss1_head = loss_fuc(pred_sub_heads, sub_heads).view(-1)
loss1_head = torch.sum(loss1_head * mask) / torch.sum(mask)
loss1_tail = loss_fuc(pred_sub_tails, sub_tails).view(-1)
loss1_tail = torch.sum(loss1_tail * mask) / torch.sum(mask)
loss1 = loss1_head + loss1_tail
# loss2
loss2_head = loss_fuc(pred_obj_heads,
obj_heads).view(-1, obj_heads.shape[-1])
loss2_head = torch.sum(
loss2_head * mask.unsqueeze(-1)) / torch.sum(mask)
loss2_tail = loss_fuc(pred_obj_tails,
obj_tails).view(-1, obj_tails.shape[-1])
loss2_tail = torch.sum(
loss2_tail * mask.unsqueeze(-1)) / torch.sum(mask)
loss2 = loss2_head + loss2_tail
# optimize
loss = loss1 + loss2
loss.backward()
optimizer.step()
optimizer.zero_grad()
global_step += 1
if (global_step + 1) % config.print_freq == 0:
logger.info(
"epoch : {} step: {} #### loss1: {} loss2: {}".format(
_, global_step + 1,
loss1.cpu().item(),
loss2.cpu().item()))
if (global_step + 1) % config.eval_freq == 0:
logger.info("***** Running evaluating *****")
with torch.no_grad():
Bert_model.eval()
submodel.eval()
objmodel.eval()
P, R, F1 = utils.metric(Bert_model, submodel, objmodel,
dev_data, id2rel, tokenizer)
logger.info(f'precision:{P}\nrecall:{R}\nF1:{F1}')
Bert_model.train()
submodel.train()
objmodel.train()
if (global_step + 1) % config.save_freq == 0:
# Save a trained model
model_name = "pytorch_model_%d" % (global_step + 1)
output_model_file = os.path.join(config.output_dir, model_name)
state = {
'bert_state_dict': Bert_model.state_dict(),
'subject_state_dict': submodel.state_dict(),
'object_state_dict': objmodel.state_dict(),
}
torch.save(state, output_model_file)
model_name = "pytorch_model_last"
output_model_file = os.path.join(config.output_dir, model_name)
state = {
'bert_state_dict': Bert_model.state_dict(),
'subject_state_dict': submodel.state_dict(),
'object_state_dict': objmodel.state_dict(),
}
torch.save(state, output_model_file)
class BertForMultiLabelSequenceClassification(BertPreTrainedModel):
"""
Bert model adapted for multi-label sequence classification.
Note that for imbalance problems will also provide an extra parameter to add inside
the loss function to integrate the classes distribution.
"""
def __init__(self, config):
super(BertForMultiLabelSequenceClassification, self).__init__(config)
self.num_labels = config.num_labels
self.bert = BertModel(config)
self.dropout = nn.Dropout(config.hidden_dropout_prob)
self.classifier = nn.Linear(config.hidden_size, config.num_labels)
self.pos_weight = torch.Tensor(config.pos_weight).to(device) if config.use_pos_weight else None
self.init_weights()
def forward(self, input_ids, attention_mask=None, token_type_ids=None, position_ids=None,
head_mask=None, labels=None):
"""
:param input_ids: sentence or sentences represented as tokens
:param attention_mask: tells the model which tokens in the input_ids are words and which are padding.
1 indicates a token and 0 indicates padding.
:param token_type_ids: used when there are two sentences that need to be part of the input. It indicate which
tokens are part of sentence1 and which are part of sentence2.
:param position_ids: indices of positions of each input sequence tokens in the position embeddings. Selected
in the range ``[0, config.max_position_embeddings - 1]
:param head_mask: mask to nullify selected heads of the self-attention modules
:param labels: target for each input
:return:
"""
outputs = self.bert(
input_ids,
attention_mask=attention_mask,
token_type_ids=token_type_ids,
position_ids=position_ids,
head_mask=head_mask,
)
pooled_output = outputs[1]
pooled_output = self.dropout(pooled_output)
logits = self.classifier(pooled_output)
outputs = (logits,) + outputs[2:]
if labels is not None:
loss_fct = BCEWithLogitsLoss(pos_weight=self.pos_weight)
labels = labels.float()
loss = loss_fct(logits.view(-1, self.num_labels), labels.view(-1, self.num_labels))
outputs = (loss,) + outputs
return outputs
def freeze_bert_encoder(self):
"""Freeze BERT layers"""
for param in self.bert.parameters():
param.requires_grad = False
def unfreeze_bert_encoder(self):
"""Unfreeze BERT layers"""
for param in self.bert.parameters():
param.requires_grad = True
class SpERT(BertPreTrainedModel):
""" Span-based model to jointly extract entities and relations """
def __init__(self,
config: BertConfig,
cls_token: int,
relation_types: int,
entity_types: int,
size_embedding: int,
prop_drop: float,
freeze_transformer: bool,
max_pairs: int = 100):
super(SpERT, self).__init__(config)
# BERT model
self.bert = BertModel(config)
# layers
self.rel_classifier = nn.Linear(
config.hidden_size * 3 + size_embedding * 2, relation_types)
self.entity_classifier = nn.Linear(
config.hidden_size * 2 + size_embedding, entity_types)
self.size_embeddings = nn.Embedding(100, size_embedding)
self.dropout = nn.Dropout(prop_drop)
self._cls_token = cls_token
self._relation_types = relation_types
self._entity_types = entity_types
self._max_pairs = max_pairs
# weight initialization
self.init_weights()
if freeze_transformer:
print("Freeze transformer weights")
# freeze all transformer weights
for param in self.bert.parameters():
param.requires_grad = False
def _forward_train(self, encodings: torch.tensor,
context_masks: torch.tensor, entity_masks: torch.tensor,
entity_sizes: torch.tensor, relations: torch.tensor,
rel_masks: torch.tensor):
# get contextualized token embeddings from last transformer layer
context_masks = context_masks.float()
h = self.bert(input_ids=encodings, attention_mask=context_masks)[0]
entity_masks = entity_masks.float()
batch_size = encodings.shape[0]
# classify entities
size_embeddings = self.size_embeddings(
entity_sizes) # embed entity candidate sizes
entity_clf, entity_spans_pool = self._classify_entities(
encodings, h, entity_masks, size_embeddings)
# classify relations
rel_masks = rel_masks.float().unsqueeze(-1)
h_large = h.unsqueeze(1).repeat(
1, max(min(relations.shape[1], self._max_pairs), 1), 1, 1)
rel_clf = torch.zeros(
[batch_size, relations.shape[1],
self._relation_types]).to(self.rel_classifier.weight.device)
# obtain relation logits
# chunk processing to reduce memory usage
for i in range(0, relations.shape[1], self._max_pairs):
# classify relation candidates
chunk_rel_logits = self._classify_relations(
entity_spans_pool, size_embeddings, relations, rel_masks,
h_large, i)
rel_clf[:, i:i + self._max_pairs, :] = chunk_rel_logits
return entity_clf, rel_clf
def _forward_eval(self, encodings: torch.tensor,
context_masks: torch.tensor, entity_masks: torch.tensor,
entity_sizes: torch.tensor, entity_spans: torch.tensor,
entity_sample_masks: torch.tensor):
# get contextualized token embeddings from last transformer layer
context_masks = context_masks.float()
h = self.bert(input_ids=encodings, attention_mask=context_masks)[0]
entity_masks = entity_masks.float()
batch_size = encodings.shape[0]
ctx_size = context_masks.shape[-1]
# classify entities
size_embeddings = self.size_embeddings(
entity_sizes) # embed entity candidate sizes
entity_clf, entity_spans_pool = self._classify_entities(
encodings, h, entity_masks, size_embeddings)
# ignore entity candidates that do not constitute an actual entity for relations (based on classifier)
relations, rel_masks, rel_sample_masks = self._filter_spans(
entity_clf, entity_spans, entity_sample_masks, ctx_size)
rel_masks = rel_masks.float()
rel_sample_masks = rel_sample_masks.float()
h_large = h.unsqueeze(1).repeat(
1, max(min(relations.shape[1], self._max_pairs), 1), 1, 1)
rel_clf = torch.zeros(
[batch_size, relations.shape[1],
self._relation_types]).to(self.rel_classifier.weight.device)
# obtain relation logits
# chunk processing to reduce memory usage
for i in range(0, relations.shape[1], self._max_pairs):
# classify relation candidates
chunk_rel_logits = self._classify_relations(
entity_spans_pool, size_embeddings, relations, rel_masks,
h_large, i)
# apply sigmoid
chunk_rel_clf = torch.sigmoid(chunk_rel_logits)
rel_clf[:, i:i + self._max_pairs, :] = chunk_rel_clf
rel_clf = rel_clf * rel_sample_masks # mask
# apply softmax
entity_clf = torch.softmax(entity_clf, dim=2)
return entity_clf, rel_clf, relations
def _classify_entities(self, encodings, h, entity_masks, size_embeddings):
# max pool entity candidate spans
entity_spans_pool = entity_masks.unsqueeze(-1) * h.unsqueeze(1).repeat(
1, entity_masks.shape[1], 1, 1)
entity_spans_pool = entity_spans_pool.max(dim=2)[0]
# get cls token as candidate context representation
entity_ctx = get_token(h, encodings, self._cls_token)
# create candidate representations including context, max pooled span and size embedding
entity_repr = torch.cat([
entity_ctx.unsqueeze(1).repeat(1, entity_spans_pool.shape[1], 1),
entity_spans_pool, size_embeddings
],
dim=2)
entity_repr = self.dropout(entity_repr)
# classify entity candidates
entity_clf = self.entity_classifier(entity_repr)
return entity_clf, entity_spans_pool
def _classify_relations(self, entity_spans, size_embeddings, relations,
rel_masks, h, chunk_start):
batch_size = relations.shape[0]
# create chunks if necessary
if relations.shape[1] > self._max_pairs:
relations = relations[:, chunk_start:chunk_start + self._max_pairs]
rel_masks = rel_masks[:, chunk_start:chunk_start + self._max_pairs]
h = h[:, :relations.shape[1], :]
# get pairs of entity candidate representations
entity_pairs = util.batch_index(entity_spans, relations)
entity_pairs = entity_pairs.view(batch_size, entity_pairs.shape[1], -1)
# get corresponding size embeddings
size_pair_embeddings = util.batch_index(size_embeddings, relations)
size_pair_embeddings = size_pair_embeddings.view(
batch_size, size_pair_embeddings.shape[1], -1)
# relation context (context between entity candidate pair)
rel_ctx = rel_masks * h
rel_ctx = rel_ctx.max(dim=2)[0]
# create relation candidate representations including context, max pooled entity candidate pairs
# and corresponding size embeddings
rel_repr = torch.cat([rel_ctx, entity_pairs, size_pair_embeddings],
dim=2)
rel_repr = self.dropout(rel_repr)
# classify relation candidates
chunk_rel_logits = self.rel_classifier(rel_repr)
return chunk_rel_logits
def _filter_spans(self, entity_clf, entity_spans, entity_sample_masks,
ctx_size):
batch_size = entity_clf.shape[0]
entity_logits_max = entity_clf.argmax(
dim=-1) * entity_sample_masks.long(
) # get entity type (including none)
batch_relations = []
batch_rel_masks = []
batch_rel_sample_masks = []
for i in range(batch_size):
rels = []
rel_masks = []
sample_masks = []
# get spans classified as entities
non_zero_indices = (entity_logits_max[i] != 0).nonzero().view(-1)
non_zero_spans = entity_spans[i][non_zero_indices].tolist()
non_zero_indices = non_zero_indices.tolist()
# create relations and masks
for i1, s1 in zip(non_zero_indices, non_zero_spans):
for i2, s2 in zip(non_zero_indices, non_zero_spans):
if i1 != i2:
rels.append((i1, i2))
rel_masks.append(
sampling.create_rel_mask(s1, s2, ctx_size))
sample_masks.append(1)
if not rels:
# case: no more than two spans classified as entities
batch_relations.append(torch.tensor([[0, 0]],
dtype=torch.long))
batch_rel_masks.append(
torch.tensor([[0] * ctx_size], dtype=torch.bool))
batch_rel_sample_masks.append(
torch.tensor([0], dtype=torch.bool))
else:
# case: more than two spans classified as entities
batch_relations.append(torch.tensor(rels, dtype=torch.long))
batch_rel_masks.append(torch.stack(rel_masks))
batch_rel_sample_masks.append(
torch.tensor(sample_masks, dtype=torch.bool))
# stack
device = self.rel_classifier.weight.device
batch_relations = util.padded_stack(batch_relations).to(device)
batch_rel_masks = util.padded_stack(batch_rel_masks).to(
device).unsqueeze(-1)
batch_rel_sample_masks = util.padded_stack(batch_rel_sample_masks).to(
device).unsqueeze(-1)
return batch_relations, batch_rel_masks, batch_rel_sample_masks
def forward(self, *args, evaluate=False, **kwargs):
if not evaluate:
return self._forward_train(*args, **kwargs)
else:
return self._forward_eval(*args, **kwargs)
class BertLstmCrf(BertPreTrainedModel):
def __init__(self, config, extra_config, ignore_ids):
"""
num_labels : int, required
Number of tags.
idx2tag : ``Dict[int, str]``, required
A mapping {label_id -> label}. Example: {0:"B-LOC", 1:"I-LOC", 2:"O"}
label_encoding : ``str``, required
Indicates which constraint to apply. Current choices are
"BIO", "IOB1", "BIOUL", "BMES" and "BIOES",.
B = Beginning
I/M = Inside / Middle
L/E = Last / End
O = Outside
U/W/S = Unit / Whole / Single
"""
super(BertLstmCrf, self).__init__(config)
self.pretraind = BertModel(config)
self.dropout = nn.Dropout(extra_config.hidden_dropout_prob)
self.classifier = nn.Linear(config.hidden_size, config.num_labels)
self.bilstm = nn.LSTM(input_size=config.hidden_size,
hidden_size=config.hidden_size // 2,
batch_first=True,
num_layers=extra_config.num_layers,
dropout=extra_config.lstm_dropout,
bidirectional=True)
self.crf = crf(config.num_labels, extra_config.label_encoding,
extra_config.idx2tag)
self.init_weights()
if extra_config.freez_prrtrained:
for param in self.pretraind.parameters():
param.requires_grad = False
self.ignore_ids = ignore_ids
def forward(self,
input_ids,
attention_mask=None,
token_type_ids=None,
position_ids=None,
head_mask=None,
labels=None):
# outputs的组成：
# last_hidden_state： Sequence of hidden-states at the output of the last layer of the model.
# (batch_size, sequence_length, hidden_size)
# pooler_output: Last layer hidden-state of the first token of the sequence (classification token)
# processed by a Linear layer and a Tanh activation function.
# hidden_states： one for the output of the embeddings + one for the output of each layer.
# each is (batch_size, sequence_length, hidden_size)
# attentions: Attentions weights after the attention softmax of each layer.
# each is (batch_size, num_heads, sequence_length, sequence_length)
outputs = self.pretraind(input_ids,
attention_mask=attention_mask,
token_type_ids=token_type_ids,
position_ids=position_ids,
head_mask=head_mask)
last_hidden_state = outputs[0]
seq_output = self.dropout(last_hidden_state)
seq_output, _ = self.bilstm(seq_output)
seq_output = nn.LayerNorm(seq_output.size()[-1])(seq_output)
logits = self.classifier(seq_output)
outputs = (logits, ) + outputs[2:]
masked_labels, masked_logits = self._get_masked_inputs(
input_ids, labels, logits, attention_mask)
if labels is not None:
loss = self.crf(masked_logits, masked_labels,
mask=None) # mask=None: 已经处理了所有的无用的位置
outputs = (loss, ) + outputs
# (loss), logits, (hidden_states), (attentions)
return outputs
def _get_masked_inputs(self, input_ids, label_ids, logits, attention_mask):
ignore_ids = self.ignore_ids
# Remove unuseful positions
masked_ids = input_ids[(1 == attention_mask)]
masked_labels = label_ids[(1 == attention_mask)]
masked_logits = logits[(1 == attention_mask)]
for id in ignore_ids:
masked_labels = masked_labels[(id != masked_ids)]
masked_logits = masked_logits[(id != masked_ids)]
masked_ids = masked_ids[(id != masked_ids)]
return masked_labels, masked_logits