def test():
config_ = BertConfig().from_json_file(MODEL_PATH + 'bert_config.json')
# device = torch.device("cuda" if torch.cuda.is_available() and not args.no_cuda else "cpu")
# model.bert.load_state_dict(torch.load(args.init_checkpoint, map_location='cpu'))
from transformers import BertTokenizer
# tokenizer = BertTokenizer(MODEL_PATH + 'vocab.txt')
# inputs = tokenizer("Hello, my dog is cute", return_tensors="pt")
# print(inputs)
model_ = BertModel(config_).from_pretrained(MODEL_PATH)
for name, param in model_.named_parameters():
print(name)
def get_pretrained_model(path, logger, args=None):
logger.info('load pretrained model in {}'.format(path))
bert_tokenizer = BertTokenizer.from_pretrained(path)
if args is None or args.hidden_layers == 12:
bert_config = BertConfig.from_pretrained(path)
bert_model = BertModel.from_pretrained(path)
else:
logger.info('load {} layers bert'.format(args.hidden_layers))
bert_config = BertConfig.from_pretrained(path, num_hidden_layers=args.hidden_layers)
bert_model = BertModel(bert_config)
model_param_list = [p[0] for p in bert_model.named_parameters()]
load_dict = torch.load(os.path.join(path, 'pytorch_model.bin'))
new_load_dict = {}
for k, v in load_dict.items():
k = k.replace('bert.', '')
if k in model_param_list:
new_load_dict[k] = v
new_load_dict['embeddings.position_ids'] = torch.tensor([i for i in range(512)]).unsqueeze(dim=0)
bert_model.load_state_dict(new_load_dict)
logger.info('load complete')
return bert_config, bert_tokenizer, bert_model
class BertLSTM(BertPreTrainedModel):
def __init__(self, config: BertConfig):
super().__init__(config)
self.bert = BertModel(config)
self.dropout = nn.Dropout(config.hidden_dropout_prob)
self.lstm = nn.LSTM(input_size=config.hidden_size,
hidden_size=config.hidden_size,
num_layers=1,
dropout=0,
batch_first=True,
bidirectional=False)
self.fc = nn.Linear(config.hidden_size * 3, config.num_labels)
self.fc_bn = nn.BatchNorm1d(config.num_labels)
self.tanh = nn.Tanh()
self.init_weights()
# Default: freeze bert
for name, param in self.bert.named_parameters():
param.requires_grad = False
# Unfreeze layers
if config.unfreeze == "embed":
for name, param in self.bert.named_parameters():
if "embeddings" in name:
param.requires_grad = True
if config.unfreeze == "embed_enc0":
for name, param in self.bert.named_parameters():
if "embeddings" in name or "encoder.layer.0" in name:
param.requires_grad = True
if config.unfreeze == "embed_enc0_pooler":
for name, param in self.bert.named_parameters():
if "embeddings" in name or "encoder.layer.0" in name or "pooler" in name:
param.requires_grad = True
if config.unfreeze == "enc0":
for name, param in self.bert.named_parameters():
if "encoder.layer.0" in name:
param.requires_grad = True
if config.unfreeze == "enc0_pooler":
for name, param in self.bert.named_parameters():
if "encoder.layer.0" in name or "pooler" in name:
param.requires_grad = True
if config.unfreeze == "embed_pooler":
for name, param in self.bert.named_parameters():
if "embed" in name or "pooler" in name:
param.requires_grad = True
if config.unfreeze == "pooler":
for name, param in self.bert.named_parameters():
if "pooler" in name:
param.requires_grad = True
if config.unfreeze == "enc-1":
n_layer = sum([
1 for name, _ in self.bert.named_parameters()
if "encoder.layer" in name
])
last_layer = "encoder.layer." + str(
int(n_layer / 16 - 1)) # each enc layer has 16 pars
for name, param in self.bert.named_parameters():
if last_layer in name:
param.requires_grad = True
if config.unfreeze == "enc-1_pooler":
n_layer = sum([
1 for name, _ in self.bert.named_parameters()
if "encoder.layer" in name
])
last_layer = "encoder.layer." + str(
int(n_layer / 16 - 1)) # each enc layer has 16 pars
for name, param in self.bert.named_parameters():
if last_layer in name or "pooler" in name:
param.requires_grad = True
def forward(self, doc):
"""
Input:
doc: [batch_size, num_chunks, 3, max_chunk_len]
Returns:
out: [batch_size, output_dim]
"""
batch_size = doc.shape[0]
pooled = self.bert(input_ids=doc[0, :, 0],
attention_mask=doc[0, :, 1],
token_type_ids=doc[0, :, 2])[1].unsqueeze(0)
for i in range(batch_size - 1):
# Output of BertModel: (last_hidden_state, pooler_output, hidden_states, attentions)
# Last layer hidden-state of the first token of the sequence (classification token)
pool_i = self.bert(input_ids=doc[i + 1, :, 0],
attention_mask=doc[i + 1, :, 1],
token_type_ids=doc[i + 1, :, 2])[1]
pooled = torch.cat((pooled, pool_i.unsqueeze(0)), dim=0)
dp = self.dropout(pooled) # [batch_size, num_chunks, hidden_size]
# output: [batch_size, num_chunks, n_directions*hidden_size], output features from last layer for each t
# h_n: [n_layers*n_directions, batch_size, hidden_size], hidden state for t=seq_len
# c_n: [n_layers*n_directions, batch_size, hidden_size], cell state fir t=seq_len
output, (h_n, c_n) = self.lstm(dp)
# Concat pooling
# h_n = output[:,-1,].squeeze(1) # [batch_size, hidden_size]
h_n = h_n.squeeze(0) # [batch_size, hidden_size]
h_max = torch.max(output, dim=1).values # [batch_size, hidden_size]
h_mean = torch.mean(output, dim=1) # [batch_size, hidden_size]
out = torch.cat((h_n, h_max, h_mean),
dim=1) # [batch_size, hidden_size*3]
out = self.fc(out) # [batch_size, num_labels]
out = self.fc_bn(out)
out = F.softmax(out, dim=1) # [batch_size, num_labels]
# out = self.tanh(out) # [batch_size, num_labels]
return out
class BertPoolLSTM(BertPreTrainedModel):
def __init__(self, config: BertConfig):
super().__init__(config)
self.config = config
self.bert = BertModel(config)
# self.seq_summary = SequenceSummary(config)
self.dropout = nn.Dropout(config.hidden_dropout_prob)
self.lstm = nn.LSTM(input_size=config.hidden_size,
hidden_size=config.hidden_size,
num_layers=1,
dropout=0,
batch_first=True,
bidirectional=False)
self.fc = nn.Linear(config.hidden_size, config.num_labels)
self.fc_bn = nn.BatchNorm1d(config.num_labels)
self.init_weights()
# Default: freeze bert
for name, param in self.bert.named_parameters():
param.requires_grad = False
# Unfreeze layers
if config.unfreeze == "pooler":
for name, param in self.bert.named_parameters():
if "pooler" in name:
param.requires_grad = True
if config.unfreeze == "enc-1":
n_layer = sum([
1 for name, _ in self.bert.named_parameters()
if "encoder.layer" in name
])
last_layer = "encoder.layer." + str(
int(n_layer / 16 - 1)) # each enc layer has 16 pars
for name, param in self.bert.named_parameters():
if last_layer in name:
param.requires_grad = True
if config.unfreeze == "enc-1_pooler":
n_layer = sum([
1 for name, _ in self.bert.named_parameters()
if "encoder.layer" in name
])
last_layer = "encoder.layer." + str(
int(n_layer / 16 - 1)) # each enc layer has 16 pars
for name, param in self.bert.named_parameters():
if last_layer in name or "pooler" in name:
param.requires_grad = True
def forward(self, doc):
"""
Input:
doc: [batch_size, n_chunks, 3, max_chunk_len]
n_chunks is the number of chunks within the batch (same for each doc after PadDoc)
Returns:
out: [batch_size, output_dim]
"""
batch_size = doc.shape[0]
hidden_pooled_layers = []
for k in range(batch_size):
# Each doc is considered as a special 'batch' and each chunk is an element of the special 'bert_batch'
# n_chunks is the temporary 'bert_batch_size', max_chunk_len corresponds to 'seq_len'
bert_output_k = self.bert(
input_ids=doc[k, :, 0], # [n_chunks, max_chunk_len]
attention_mask=doc[k, :, 1],
token_type_ids=doc[k, :, 2])
# pooled_k = bert_output_k[1].unsqueeze(0)
hidden_states_k = bert_output_k[
2] # each element in the tuple: [n_chunks, max_chunk_len, hidden_size]
# Average pooling over last [pool_layers] layers
hidden_list_k = list(hidden_states_k[self.config.pool_layers:])
hidden_stack_k = torch.stack(
hidden_list_k
) # [n_pooled_layers, n_chunks, max_chunk_len, hidden_size]
hidden_pooled_layers_k = torch.mean(
hidden_stack_k,
dim=0) # [n_chunks, max_chunk_len, hidden_size]
hidden_pooled_layers.append(hidden_pooled_layers_k)
hidden_pooled_layers = torch.stack(
hidden_pooled_layers
) # [batch_size, n_chunks, max_chunk_len, hidden_size]
# Pooling within each chunk (over 512 word tokens of individual chunk)
if self.config.pool_method == 'mean':
hidden_pooled = torch.mean(
hidden_pooled_layers,
dim=2) # [batch_size, n_chunks, hidden_size]
elif self.config.pool_method == 'max':
hidden_pooled = torch.max(
hidden_pooled_layers,
dim=2).values # [batch_size, n_chunks, hidden_size]
elif self.config.pool_method == 'mean_max':
hidden_pooled_mean = torch.mean(
hidden_pooled_layers,
dim=2) # [batch_size, n_chunks, hidden_size]
hidden_pooled_max = torch.max(
hidden_pooled_layers,
dim=2).values # [batch_size, n_chunks, hidden_size]
hidden_pooled = torch.cat(
(hidden_pooled_mean, hidden_pooled_max),
dim=1) # [batch_size, n_chunks*2, hidden_size]
elif self.config.pool_method == 'cls':
hidden_pooled = hidden_pooled_layers[:, :,
0, :] # [batch_size, n_chunks, hidden_size]
else: # pool_method is None
hidden_pooled = hidden_pooled_layers.view(
batch_size, -1, self.config.hidden_size
) # [batch_size, n_chunks*max_chunk_len, hidden_size]
dp = self.dropout(hidden_pooled) # [batch_size, ?, hidden_size]
# ? can be n_chunks, n_chunks*2 or n_chunks*max_chunk_len)
# output: [batch_size, ?, n_directions*hidden_size], output features from last layer for each t
# h_n: [n_layers*n_directions, batch_size, hidden_size], hidden state for t=seq_len
# c_n: [n_layers*n_directions, batch_size, hidden_size], cell state fir t=seq_len
output, (h_n, c_n) = self.lstm(dp)
h_n = h_n.squeeze(0) # [batch_size, hidden_size]
out = self.fc(h_n) # [batch_size, num_labels]
out = self.fc_bn(out)
out = F.softmax(out, dim=1) # [batch_size, num_labels]
return out
class BertPoolConv(BertPreTrainedModel):
def __init__(self, config: BertConfig):
super().__init__(config)
self.config = config
self.bert = BertModel(config)
# self.seq_summary = SequenceSummary(config)
self.dropout = nn.Dropout(config.hidden_dropout_prob)
self.convs = nn.ModuleList([
nn.Conv2d(in_channels=1,
out_channels=config.num_filters,
kernel_size=(fsize, config.hidden_size))
for fsize in config.filter_sizes
])
self.fc = nn.Linear(config.num_filters * len(config.filter_sizes),
config.num_labels)
self.fc_bn = nn.BatchNorm1d(config.num_labels)
self.init_weights()
# Default: freeze bert
for name, param in self.bert.named_parameters():
param.requires_grad = False
# Unfreeze layers
if config.unfreeze == "pooler":
for name, param in self.bert.named_parameters():
if "pooler" in name:
param.requires_grad = True
if config.unfreeze == "enc-1":
n_layer = sum([
1 for name, _ in self.bert.named_parameters()
if "encoder.layer" in name
])
last_layer = "encoder.layer." + str(
int(n_layer / 16 - 1)) # each enc layer has 16 pars
for name, param in self.bert.named_parameters():
if last_layer in name:
param.requires_grad = True
if config.unfreeze == "enc-1_pooler":
n_layer = sum([
1 for name, _ in self.bert.named_parameters()
if "encoder.layer" in name
])
last_layer = "encoder.layer." + str(
int(n_layer / 16 - 1)) # each enc layer has 16 pars
for name, param in self.bert.named_parameters():
if last_layer in name or "pooler" in name:
param.requires_grad = True
def forward(self, doc):
"""
Input:
doc: [batch_size, n_chunks, 3, max_chunk_len]
n_chunks is the number of chunks within the batch (same for each doc after PadDoc)
Returns:
out: [batch_size, output_dim]
"""
batch_size = doc.shape[0]
hidden_pooled_layers = []
for k in range(batch_size):
# Each doc is considered as a special 'batch' and each chunk is an element of the special 'bert_batch'
# n_chunks is the temporary 'bert_batch_size', max_chunk_len corresponds to 'seq_len'
bert_output_k = self.bert(
input_ids=doc[k, :, 0], # [n_chunks, max_chunk_len]
attention_mask=doc[k, :, 1],
token_type_ids=doc[k, :, 2])
# pooled_k = bert_output_k[1].unsqueeze(0)
hidden_states_k = bert_output_k[
2] # each element in the tuple: [n_chunks, max_chunk_len, hidden_size]
# Average pooling over last [pool_layers] layers
hidden_list_k = list(hidden_states_k[self.config.pool_layers:])
hidden_stack_k = torch.stack(
hidden_list_k
) # [n_pooled_layers, n_chunks, max_chunk_len, hidden_size]
hidden_pooled_layers_k = torch.mean(
hidden_stack_k,
dim=0) # [n_chunks, max_chunk_len, hidden_size]
hidden_pooled_layers.append(hidden_pooled_layers_k)
hidden_pooled_layers = torch.stack(
hidden_pooled_layers
) # [batch_size, n_chunks, max_chunk_len, hidden_size]
# Pooling within each chunk (over 512 word tokens of individual chunk)
if self.config.pool_method == 'mean':
hidden_pooled = torch.mean(
hidden_pooled_layers,
dim=2) # [batch_size, n_chunks, hidden_size]
elif self.config.pool_method == 'max':
hidden_pooled = torch.max(
hidden_pooled_layers,
dim=2).values # [batch_size, n_chunks, hidden_size]
elif self.config.pool_method == 'mean_max':
hidden_pooled_mean = torch.mean(
hidden_pooled_layers,
dim=2) # [batch_size, n_chunks, hidden_size]
hidden_pooled_max = torch.max(
hidden_pooled_layers,
dim=2).values # [batch_size, n_chunks, hidden_size]
hidden_pooled = torch.cat(
(hidden_pooled_mean, hidden_pooled_max),
dim=1) # [batch_size, n_chunks*2, hidden_size]
elif self.config.pool_method == 'cls':
hidden_pooled = hidden_pooled_layers[:, :,
0, :] # [batch_size, n_chunks, hidden_size]
else: # pool_method is None
hidden_pooled = hidden_pooled_layers.view(
batch_size, -1, self.config.hidden_size
) # [batch_size, n_chunks*max_chunk_len, hidden_size]
hidden_pooled = hidden_pooled.unsqueeze(
1) # [batch_size, 1, ?, hidden_size]
hidden_conved = [
F.relu(conv(hidden_pooled)) for conv in self.convs
] # hidden_conved[i]: [batch_size, n_filters, (?-fsize+1), 1]
hidden_conved = [
conv.squeeze(3) for conv in hidden_conved
] # hidden_conved[i]: [batch_size, n_filters, (?-fsize+1)]
hc_pooled = [
F.max_pool1d(conv, conv.shape[2]) for conv in hidden_conved
] # hc_pooled[i]: [batch_size, n_filters, 1]
hc_pooled = [pool.squeeze(2) for pool in hc_pooled
] # hc_pooled[i]: [batch_size, n_filters]
cat = torch.cat(hc_pooled,
dim=1) # [batch_size, n_filters * len(filter_sizes)]
dp = self.dropout(cat)
out = self.fc(dp) # # [batch_size, num_labels]
out = self.fc_bn(out)
out = F.softmax(out, dim=1) # [batch_size, num_labels]
return out
'hidden_act': 'gelu',
'hidden_dropout_prob': 0.1,
'hidden_size': 768,
'initializer_range': 0.02,
'intermediate_size': 3072,
'max_position_embeddings': 512,
'num_attention_heads': 12,
'num_hidden_layers': 12,
'type_vocab_size': 2,
'vocab_size': 8002
}
if __name__ == "__main__":
ctx = "cpu"
# kobert
kobert_model_file = "./kobert_resources/pytorch_kobert_2439f391a6.params"
kobert_vocab_file = "./kobert_resources/kobert_news_wiki_ko_cased-ae5711deb3.spiece"
bertmodel = BertModel(config=BertConfig.from_dict(bert_config))
bertmodel.load_state_dict(torch.load(kobert_model_file))
device = torch.device(ctx)
bertmodel.to(device)
# bertmodel.eval()
# for name, param in bertmodel.named_parameters():
# print(name, param.shape)
for name, param in bertmodel.named_parameters():
if param.requires_grad:
print(name, param.shape)
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 BertPoolConv(BertPreTrainedModel):
def __init__(self, config: BertConfig):
super().__init__(config)
self.config = config
self.bert = BertModel(config)
# self.seq_summary = SequenceSummary(config)
self.dropout = nn.Dropout(config.hidden_dropout_prob)
self.convs = nn.ModuleList([
nn.Conv2d(in_channels=1,
out_channels=config.num_filters,
kernel_size=(fsize, config.hidden_size))
for fsize in config.filter_sizes
])
self.fc = nn.Linear(config.num_filters * len(config.filter_sizes),
config.num_labels)
self.fc_bn = nn.BatchNorm1d(config.num_labels)
self.init_weights()
# Default: freeze bert
for name, param in self.bert.named_parameters():
param.requires_grad = False
# Unfreeze layers
if config.unfreeze == "pooler":
for name, param in self.bert.named_parameters():
if "pooler" in name:
param.requires_grad = True
if config.unfreeze == "enc-1":
n_layer = sum([
1 for name, _ in self.bert.named_parameters()
if "encoder.layer" in name
])
last_layer = "encoder.layer." + str(
int(n_layer / 16 - 1)) # each enc layer has 16 pars
for name, param in self.bert.named_parameters():
if last_layer in name:
param.requires_grad = True
if config.unfreeze == "enc-1_pooler":
n_layer = sum([
1 for name, _ in self.bert.named_parameters()
if "encoder.layer" in name
])
last_layer = "encoder.layer." + str(
int(n_layer / 16 - 1)) # each enc layer has 16 pars
for name, param in self.bert.named_parameters():
if last_layer in name or "pooler" in name:
param.requires_grad = True
def forward(self, doc):
"""
Input:
doc: [batch_size, n_chunks, 3, max_chunk_len]
n_chunks is the number of chunks within the batch (same for each doc after PadDoc)
Returns:
out: [batch_size, output_dim]
"""
batch_size = doc.shape[0]
hidden_pooled_layers = []
for k in range(batch_size):
# Each doc is considered as a special 'batch' and each chunk is an element of the special 'bert_batch'
# n_chunks is the temporary 'bert_batch_size', max_chunk_len corresponds to 'seq_len'
bert_output_k = self.bert(
input_ids=doc[k, :, 0], # [n_chunks, max_chunk_len]
attention_mask=doc[k, :, 1],
token_type_ids=doc[k, :, 2])
# pooled_k = bert_output_k[1].unsqueeze(0)
hidden_states_k = bert_output_k[
2] # each element in the tuple: [n_chunks, max_chunk_len, hidden_size]
# Average pooling over last [pool_layers] layers
hidden_list_k = list(hidden_states_k[self.config.pool_layers:])
hidden_stack_k = torch.stack(
hidden_list_k
) # [n_pooled_layers, n_chunks, max_chunk_len, hidden_size]
hidden_pooled_layers_k = torch.mean(
hidden_stack_k,
dim=0) # [n_chunks, max_chunk_len, hidden_size]
hidden_pooled_layers.append(hidden_pooled_layers_k)
hidden_pooled_layers = torch.stack(
hidden_pooled_layers
) # [batch_size, n_chunks, max_chunk_len, hidden_size]
# Pooling within each chunk (over 512 word tokens of individual chunk)
if self.config.pool_method == 'mean':
hidden_pooled = torch.mean(
hidden_pooled_layers,
dim=2) # [batch_size, n_chunks, hidden_size]
elif self.config.pool_method == 'max':
hidden_pooled = torch.max(
hidden_pooled_layers,
dim=2).values # [batch_size, n_chunks, hidden_size]
elif self.config.pool_method == 'mean_max':
hidden_pooled_mean = torch.mean(
hidden_pooled_layers,
dim=2) # [batch_size, n_chunks, hidden_size]
hidden_pooled_max = torch.max(
hidden_pooled_layers,
dim=2).values # [batch_size, n_chunks, hidden_size]
hidden_pooled = torch.cat(
(hidden_pooled_mean, hidden_pooled_max),
dim=1) # [batch_size, n_chunks*2, hidden_size]
elif self.config.pool_method == 'cls':
hidden_pooled = hidden_pooled_layers[:, :,
0, :] # [batch_size, n_chunks, hidden_size]
else: # pool_method is None
hidden_pooled = hidden_pooled_layers.view(
batch_size, -1, self.config.hidden_size
) # [batch_size, n_chunks*max_chunk_len, hidden_size]
hidden_pooled = hidden_pooled.unsqueeze(
1) # [batch_size, 1, ?, hidden_size]
hidden_conved = [
F.relu(conv(hidden_pooled)) for conv in self.convs
] # hidden_conved[i]: [batch_size, n_filters, (?-fsize+1), 1]
hidden_conved = [
conv.squeeze(3) for conv in hidden_conved
] # hidden_conved[i]: [batch_size, n_filters, (?-fsize+1)]
hc_pooled = [
F.max_pool1d(conv, conv.shape[2]) for conv in hidden_conved
] # hc_pooled[i]: [batch_size, n_filters, 1]
hc_pooled = [pool.squeeze(2) for pool in hc_pooled
] # hc_pooled[i]: [batch_size, n_filters]
cat = torch.cat(hc_pooled,
dim=1) # [batch_size, n_filters * len(filter_sizes)]
dp = self.dropout(cat)
out = self.fc(dp) # # [batch_size, num_labels]
out = self.fc_bn(out)
out = F.softmax(out, dim=1) # [batch_size, num_labels]
return out
#%%
# class AlbertLinear(AlbertPreTrainedModel):
# def __init__(self, config: AlbertConfig):
# super().__init__(config)
# self.albert = AlbertModel(config)
# self.dropout = nn.Dropout(config.hidden_dropout_prob)
# self.fc = nn.Linear(config.hidden_size, config.num_labels)
# self.fc_bn = nn.BatchNorm1d(config.num_labels)
# # self.fc = nn.Linear(config.hidden_size * config.n_chunks, config.num_labels)
# self.init_weights()
# # Default: freeze albert
# for name, param in self.albert.named_parameters():
# param.requires_grad = False
# # Unfreeze layers
# if config.unfreeze == "pooler":
# for name, param in self.albert.named_parameters():
# if "pooler" in name:
# param.requires_grad = True
# def forward(self, doc):
# """
# Input:
# doc: [batch_size, num_chunks, 3, max_chunk_len]
# Returns:
# out: [batch_size, output_dim]
# """
# batch_size = doc.shape[0]
# pooled = self.albert(input_ids = doc[0,:,0],
# attention_mask = doc[0,:,1],
# token_type_ids = doc[0,:,2])[1].unsqueeze(0)
# for i in range(batch_size-1):
# pool_i = self.albert(input_ids = doc[i+1,:,0],
# attention_mask = doc[i+1,:,1],
# token_type_ids = doc[i+1,:,2])[1]
# pooled = torch.cat((pooled, pool_i.unsqueeze(0)), dim=0)
# dp = self.dropout(pooled) # [batch_size, num_chunks, hidden_size]
# # concat = dp.view(batch_size, -1) # [batch_size, num_chunks*hidden_size]
# if self.albert.config.linear_max == True:
# dp = torch.max(dp, dim=1).values # [batch_size, hidden_size]
# else:
# dp = torch.mean(dp, dim=1) # [batch_size, hidden_size]
# # dp = dp.sum(dim=1) # [batch_size, hidden_size]
# out = self.fc(dp) # [batch_size, num_labels]
# out = self.fc_bn(out)
# out = F.softmax(out, dim=1) # [batch_size, num_labels]
# return out
#%%
# class AlbertLSTM(AlbertPreTrainedModel):
# def __init__(self, config: AlbertConfig):
# super().__init__(config)
# self.albert = AlbertModel(config)
# self.dropout = nn.Dropout(config.hidden_dropout_prob)
# self.lstm = nn.LSTM(input_size = config.hidden_size, hidden_size = config.hidden_size,
# num_layers = 1, dropout = 0,
# batch_first = True, bidirectional = False)
# self.fc = nn.Linear(config.hidden_size, config.num_labels)
# self.fc_bn = nn.BatchNorm1d(config.num_labels)
# self.tanh = nn.Tanh()
# self.init_weights()
# # Default: freeze albert
# for name, param in self.albert.named_parameters():
# param.requires_grad = False
# # Unfreeze layers
# if config.unfreeze == "embed":
# for name, param in self.albert.named_parameters():
# if "embeddings" in name:
# param.requires_grad = True
# if config.unfreeze == "embed_enc0":
# for name, param in self.albert.named_parameters():
# if "embeddings" in name or "encoder" in name:
# param.requires_grad = True
# if config.unfreeze == "embed_enc0_pooler":
# for name, param in self.albert.named_parameters():
# param.requires_grad = True
# if config.unfreeze == "enc0":
# for name, param in self.albert.named_parameters():
# if "encoder" in name:
# param.requires_grad = True
# if config.unfreeze == "enc0_pooler":
# for name, param in self.albert.named_parameters():
# if "encoder" in name or "pooler" in name:
# param.requires_grad = True
# if config.unfreeze == "embed_pooler":
# for name, param in self.albert.named_parameters():
# if "embed" in name or "pooler" in name:
# param.requires_grad = True
# if config.unfreeze == "pooler":
# for name, param in self.albert.named_parameters():
# if "pooler" in name:
# param.requires_grad = True
# def forward(self, doc):
# """
# Input:
# doc: [batch_size, num_chunks, 3, max_chunk_len]
# Returns:
# out: [batch_size, output_dim]
# """
# batch_size = doc.shape[0]
# pooled = self.albert(input_ids = doc[0,:,0],
# attention_mask = doc[0,:,1],
# token_type_ids = doc[0,:,2])[1].unsqueeze(0)
# for i in range(batch_size-1):
# # Output of BertModel: (last_hidden_state, pooler_output, hidden_states, attentions)
# # Last layer hidden-state of the first token of the sequence (classification token)
# pool_i = self.albert(input_ids = doc[i+1,:,0],
# attention_mask = doc[i+1,:,1],
# token_type_ids = doc[i+1,:,2])[1]
# pooled = torch.cat((pooled, pool_i.unsqueeze(0)), dim=0)
# dp = self.dropout(pooled) # [batch_size, num_chunks, bert_hidden_size]
# # output: [batch_size, num_chunks, n_directions*hidden_size], output features from last layer for each t
# # h_n: [n_layers*n_directions, batch_size, hidden_size], hidden state for t=seq_len
# # c_n: [n_layers*n_directions, batch_size, hidden_size], cell state fir t=seq_len
# output, (h_n, c_n) = self.lstm(dp)
# # h_n = output[:,-1,].squeeze(1) # [batch_size, hidden_size]
# h_n = h_n.squeeze(0) # [batch_size, hidden_size]
# out = self.fc(h_n) # [batch_size, num_labels]
# out = self.fc_bn(out)
# out = F.softmax(out, dim=1) # [batch_size, num_labels]
# # out = self.tanh(out) # [batch_size, num_labels]
# return out
for idx in range(len(attentions)):
output["bert_layer" + str(idx + 1)] = {
"hidden_states": hidden_states[idx + 1],
"attention": attentions[idx]
}
output["pred_layer"] = {"pooler_output": pooler_output}
return output
# loss_model
loss_model = MultiLayerBasedDistillationLoss(
distill_config=distill_config,
teacher_output_adaptor=output_adaptor,
student_output_adaptor=output_adaptor)
# optimizer
param_optimizer = list(student_model.named_parameters())
no_decay = ['bias', 'LayerNorm.bias', 'LayerNorm.weight']
optimizer_grouped_parameters = [{
'params':
[p for n, p in param_optimizer if not any(nd in n for nd in no_decay)],
'weight_decay':
0.01
}, {
'params':
[p for n, p in param_optimizer if any(nd in n for nd in no_decay)],
'weight_decay':
0.0
}]
optimizer = torch.optim.Adam(params=optimizer_grouped_parameters,
lr=learning_rate)
# evaluator
class BertBinaryClassification(BertPreTrainedModel):
def __init__(self, config):
"""
:param config: a transformers Config object
"""
self.num_labels = 1
super().__init__(config, num_labels=self.num_labels)
# The BertModel without pooling layer
self.bert = BertModel(config, add_pooling_layer=False)
self.dropout = nn.Dropout(config.hidden_dropout_prob)
# Input dimension depending on number of tokens encodings
input_dim = config.hidden_size * 3
cls_layers = []
cls_layers.append(nn.Linear(input_dim, config.hidden_size))
cls_layers.append(nn.GELU())
cls_layers.append(
nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps))
cls_layers.append(nn.Linear(config.hidden_size, self.num_labels))
# The classifier:
self.classifier = nn.Sequential(*cls_layers)
# Used in BCEWithLogitsLoss function
# to counteract unbalanced training sets
# Can be changed with self.set_class_weights
self.class_weights = torch.ones([1])
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,
output_attentions=None,
output_hidden_states=None,
return_dict=None):
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,
return_dict=return_dict)
# Use either pooled output or sequence output, depending on settings
bert_output = outputs[0]
# Get the state of the [CLS] token,
# and the first token of the mention and candidate entity
# Position of the first token of the candidate
# (right after the [SEP] token)
cand_pos = torch.argmax(token_type_ids, dim=1)
# Get the embedding of the first token of the candidate over the batch
cand_tensors = torch.cat([t[i] for t, i in zip(bert_output, cand_pos)
]).reshape((bert_output.size(0),
bert_output.size(-1)))
# Flattened input of 3 * hidden_size features
bert_output = torch.cat(
[bert_output[:, 0], bert_output[:, 1], cand_tensors], dim=1)
bert_output = self.dropout(bert_output)
logits = self.classifier(bert_output)
loss = None
if labels is not None:
# Binary cross entropy loss with class weights and sigmoid
loss_fn = nn.BCEWithLogitsLoss(pos_weight=self.class_weights)
loss = loss_fn(logits.view(-1),
labels.view(-1).to(dtype=torch.float))
if not return_dict:
output = (logits, ) + outputs[2:]
return ((loss, ) + output) if loss is not None else output
return SequenceClassifierOutput(
loss=loss,
logits=logits,
hidden_states=outputs.hidden_states,
attentions=outputs.attentions,
)
def freeze_layers(self, param_idx: List):
"""
Freeze layers at provided indices to not train them
:param param_idx: list of indices of layers to be frozen
"""
module_params = list(self.named_parameters())
for param in (module_params[p] for p in param_idx):
param[1].requires_grad = False
def freeze_n_transformers(self, n: int = 11):
"""
Freeze the provided number of encoders in the BERT architecture
to not train them
:param n: number of encoders to freeze
"""
n = min(n, 12)
n_emb_layers = 5
n_layers_in_transformer = 12
emb_layers = list(range(n_emb_layers))
encoder_layers = list(
range(n_emb_layers, n_emb_layers + n * n_layers_in_transformer))
self.freeze_layers(emb_layers + encoder_layers)
def freeze_bert(self):
"""
Freezes all layers in BERT from training
"""
for param in self.bert.named_parameters():
param[1].requires_grad = False
def set_class_weights(self, class_weights):
"""
Set the self.class_weights used to penalize wrong prediction of
minority class
:param class_weights: a pytorch tensor with weights over the two
classes. Used by the CrossEntropyLoss.
"""
self.class_weights = class_weights
model = BertModel(configuration)
# Accessing the model configuration
configuration = model.config
print(configuration)
# Loading the Hugging Face Bert Uncased Base Model
model = BertForSequenceClassification.from_pretrained("bert-base-uncased",
num_labels=2)
model.cuda()
# Optimizer Grouped Parameters
# Don't apply weight decay to any parameters whose names include these tokens.
# (Here, the BERT doesn't have `gamma` or `beta` parameters, only `bias` terms)
param_optimizer = list(model.named_parameters())
no_decay = ['bias', 'LayerNorm.weight']
# Separate the `weight` parameters from the `bias` parameters.
# - For the `weight` parameters, this specifies a 'weight_decay_rate' of 0.01.
# - For the `bias` parameters, the 'weight_decay_rate' is 0.0.
optimizer_grouped_parameters = [
# Filter for all parameters which *don't* include 'bias', 'gamma', 'beta'.
{
'params':
[p for n, p in param_optimizer if not any(nd in n for nd in no_decay)],
'weight_decay_rate':
0.1
},
# Filter for parameters which *do* include those.
{