355 KiB
355 KiB
Transformer
# Necessary imports
import pandas as pd
import numpy as np
import torch
import datasets
from datasets import ClassLabel, Features, Sequence, Value
from transformers import pipeline, AutoModelForTokenClassification, AutoTokenizer, TrainingArguments, Trainer, DataCollatorForTokenClassification
import warnings
warnings.filterwarnings('ignore')
Prepare data
# Divide train data into sentences and labels
train_data = pd.read_csv('train/train.tsv', sep='\t', header=None)
with open('train/train_labels.tsv', 'w') as f:
for i in range(len(train_data)):
if i == len(train_data) - 1:
f.write(train_data.iloc[i][0])
else:
f.write(train_data.iloc[i][0] + '\n')
with open('train/train_sentences.tsv', 'w') as f:
for i in range(len(train_data)):
if i == len(train_data) - 1:
f.write(train_data.iloc[i][1])
else:
f.write(train_data.iloc[i][1] + '\n')
# Data paths
train_sentences_file = 'train/train_sentences.tsv'
train_labels_file = 'train/train_labels.tsv'
val_sentences_file = 'dev-0/in.tsv'
val_labels_file = 'dev-0/expected.tsv'
test_sentences_file = 'test-A/in.tsv'
# Method to read tokens and labels from files
def read_sentences_and_labels(sentences_path, labels_path=None):
tokens = []
ner_tags = []
with open(sentences_path, 'r') as f:
for line in f:
tokens.append(line.strip().split())
if labels_path:
with open(labels_path, 'r') as f:
for line in f:
ner_tags.append(line.strip().split())
if labels_path:
return {'tokens': tokens, 'ner_tags': ner_tags}
else:
return {'tokens': tokens}
# Load data
train_data = read_sentences_and_labels(train_sentences_file, train_labels_file)
val_data = read_sentences_and_labels(val_sentences_file, val_labels_file)
test_data = read_sentences_and_labels(test_sentences_file)
# Split long sentences into multiple sentences
def split_long_sentences(data, max_length=128):
if 'ner_tags' in data:
new_data = {'tokens': [], 'ner_tags': []}
else:
new_data = {'tokens': []}
original_sentence_indices = []
fragment_lengths = []
for i in range(len(data['tokens'])):
tokens = data['tokens'][i]
if 'ner_tags' in data:
ner_tags = data['ner_tags'][i]
if len(tokens) > max_length:
for j in range(0, len(tokens), max_length):
new_data['tokens'].append(tokens[j:j+max_length])
if 'ner_tags' in data:
new_data['ner_tags'].append(ner_tags[j:j+max_length])
original_sentence_indices.append(i)
fragment_lengths.append(len(tokens[j:j+max_length]))
else:
new_data['tokens'].append(tokens)
if 'ner_tags' in data:
new_data['ner_tags'].append(ner_tags)
original_sentence_indices.append(i)
fragment_lengths.append(len(tokens))
return new_data, original_sentence_indices, fragment_lengths
# Split long sentences
train_data, train_original_sentence_indices, train_fragment_lengths = split_long_sentences(train_data)
val_data, val_original_sentence_indices, val_fragment_lengths = split_long_sentences(val_data)
test_data, test_original_sentence_indices, test_fragment_lengths = split_long_sentences(test_data)
# Convert to datasets
train_dataset = datasets.Dataset.from_dict(train_data)
val_dataset = datasets.Dataset.from_dict(val_data)
test_dataset = datasets.Dataset.from_dict(test_data)
# List of unique ner labels
unique_labels = ['O', 'B-PER', 'I-PER', 'B-ORG', 'I-ORG', 'B-LOC', 'I-LOC', 'B-MISC', 'I-MISC']
# Create class label
ner_tags_feature = ClassLabel(names=unique_labels)
# Method to convert ner tags to class labels
def convert_to_classlabel(example):
example['ner_tags'] = [ner_tags_feature.str2int(tag) for tag in example['ner_tags']]
return example
# Convert ner tags to class labels
train_dataset = train_dataset.map(convert_to_classlabel)
val_dataset = val_dataset.map(convert_to_classlabel)
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# Define features
features = Features({
'ner_tags': Sequence(ner_tags_feature),
'tokens': Sequence(Value('string'))
})
# Cast dataset
train_dataset = train_dataset.cast(features)
val_dataset = val_dataset.cast(features)
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Tokenization
# Load tokenizer
tokenizer = AutoTokenizer.from_pretrained("google-bert/bert-base-cased", return_token_type_ids="token_type_ids")
# Method to tokenize and align labels
def tokenize_and_align_labels(examples, label_all_tokens=False):
tokenized_inputs = tokenizer(examples["tokens"], truncation=True, is_split_into_words=True)
if 'ner_tags' in examples:
labels = []
for i, label in enumerate(examples[f"ner_tags"]):
word_ids = tokenized_inputs.word_ids(batch_index=i)
previous_word_idx = None
label_ids = []
for word_idx in word_ids:
# Special tokens have a word id that is None. We set the label to -100 so they are automatically
# ignored in the loss function.
if word_idx is None:
label_ids.append(-100)
# We set the label for the first token of each word.
elif word_idx != previous_word_idx:
label_ids.append(label[word_idx])
# For the other tokens in a word, we set the label to either the current label or -100, depending on
# the label_all_tokens flag.
else:
label_ids.append(label[word_idx] if label_all_tokens else -100)
previous_word_idx = word_idx
labels.append(label_ids)
tokenized_inputs["labels"] = labels
return tokenized_inputs
# Tokenize and align labels
tokenized_train = train_dataset.map(tokenize_and_align_labels, batched=True)
tokenized_val = val_dataset.map(tokenize_and_align_labels, batched=True)
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# Tokenize test data
tokenized_test = test_dataset.map(tokenize_and_align_labels, batched=True)
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Load pre-trained model
# Load model
# model = AutoModelForTokenClassification.from_pretrained("distilbert-base-uncased", num_labels=len(unique_labels))
model = AutoModelForTokenClassification.from_pretrained("ner-model", num_labels=len(unique_labels))
Retrain model with prepared data
# Define training arguments
training_args = TrainingArguments(
"test-ner",
evaluation_strategy="epoch",
learning_rate=2e-5,
per_device_train_batch_size=1,
per_device_eval_batch_size=1,
num_train_epochs=5,
weight_decay=0.01,
)
# Define data collator
data_collator = DataCollatorForTokenClassification(tokenizer)
# Define metric to compute
metric = datasets.load_metric("seqeval")
# Helper method to compute metrics
def compute_metrics(p):
predictions, labels = p
predictions = np.argmax(predictions, axis=2)
# Remove ignored index (special tokens)
true_predictions = [
[unique_labels[p] for (p, l) in zip(prediction, label) if l != -100]
for prediction, label in zip(predictions, labels)
]
true_labels = [
[unique_labels[l] for (p, l) in zip(prediction, label) if l != -100]
for prediction, label in zip(predictions, labels)
]
results = metric.compute(predictions=true_predictions, references=true_labels)
return {
"precision": results["overall_precision"],
"recall": results["overall_recall"],
"f1": results["overall_f1"],
"accuracy": results["overall_accuracy"],
}
# Define trainer
trainer = Trainer(
model,
training_args,
train_dataset=tokenized_train,
eval_dataset=tokenized_val,
data_collator=data_collator,
tokenizer=tokenizer,
compute_metrics=compute_metrics
)
Train model
# Train model
torch.cuda.empty_cache()
trainer.train()
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Epoch | Training Loss | Validation Loss |
---|
TrainOutput(global_step=10745, training_loss=0.16770398169686596, metrics={'train_runtime': 715.5143, 'train_samples_per_second': 15.017, 'train_steps_per_second': 15.017, 'total_flos': 424900907413920.0, 'train_loss': 0.16770398169686596, 'epoch': 5.0})
# Save model
trainer.save_model('ner-model')
Evaluate model
# Evaluate
trainer.evaluate()
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{'eval_loss': 0.17733338475227356, 'eval_precision': 0.7404310067545835, 'eval_recall': 0.7740416946872899, 'eval_f1': 0.7568633897747822, 'eval_accuracy': 0.9586372907517319, 'eval_runtime': 5.8684, 'eval_samples_per_second': 90.144, 'eval_steps_per_second': 90.144}
Predict on validation data
# Preprocess data
def preprocess_data(tokens):
sentences = [" ".join(token_list) for token_list in tokens]
return sentences
train_sentences = preprocess_data(train_data['tokens'])
val_sentences = preprocess_data(val_data['tokens'])
test_sentences = preprocess_data(test_data['tokens'])
# Align predictions
def align_predictions(predictions, label_ids, sentence_indices, fragment_lengths):
preds = np.argmax(predictions, axis=2)
aligned_preds = []
aligned_labels = []
for pred, label, idx, length in zip(preds, label_ids, sentence_indices, fragment_lengths):
aligned_pred = []
aligned_label = []
for p, l in zip(pred, label):
if l != -100:
aligned_pred.append(p)
aligned_label.append(l)
aligned_preds.append(aligned_pred)
aligned_labels.append(aligned_label)
return aligned_preds, aligned_labels
# Predict on validation data
predictions_val, label_ids_val, metrics_val = trainer.predict(tokenized_val)
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# Align predictions
aligned_preds_val, aligned_labels_val = align_predictions(predictions_val, label_ids_val, val_original_sentence_indices, val_fragment_lengths)
# Concat results based on val_original_sentence_indices
predicted_labels = []
true_labels = []
for i in range(len(aligned_preds_val)):
if i == 0:
predicted_labels.append(aligned_preds_val[i])
true_labels.append(aligned_labels_val[i])
elif val_original_sentence_indices[i] == val_original_sentence_indices[i-1]:
predicted_labels[-1] += aligned_preds_val[i]
true_labels[-1] += aligned_labels_val[i]
else:
predicted_labels.append(aligned_preds_val[i])
true_labels.append(aligned_labels_val[i])
Postprocessing
import regex as re
# Postprocessing
# Regex for finding I-tags that start a sequence (should be B-tags)
def incorrect_I_as_begin_tag(text):
return re.finditer(r'(?<![BI]-\w+ )I-\w+', text)
# Helper method for replacing I-tags that start a sequence with B-tags
def replace_incorrect_I_as_begin_tag(df):
# Iterate until no more changes
i = 0
while True:
outer_counter_old = 0
outer_counter = 0
print(f"Iteration: {i+1}")
for idx, row in df.iterrows():
x = incorrect_I_as_begin_tag(row['ner_tags'])
inner_counter = 0
for match in x:
inner_counter += 1
hp = list(row['ner_tags'])
hp[match.start()] = 'B'
row['ner_tags'] = "".join(hp)
outer_counter += inner_counter
print(f"Changes: {outer_counter - outer_counter_old}")
i += 1
if outer_counter_old == outer_counter:
break
else:
outer_counter_old = outer_counter
return df
# Regex for finding inconsistent I-tags after B-tags (I-tags that are not continuation of B-tags)
def inconsistent_I_after_B(text):
return re.finditer(r'(?<=B-(\w+) )(?:I-(?!\1)\w+)', text)
# Helper method for removing inconsistent I-tags after B-tags
def replace_inconsistent_I_after_B(df):
# Iterate until no more changes
i = 0
while True:
outer_counter_old = 0
outer_counter = 0
print(f"Iteration: {i+1}")
for idx, row in df.iterrows():
matches = inconsistent_I_after_B(row['ner_tags'])
inner_counter = 0
for match in matches:
inner_counter += 1
hp = list(row['ner_tags'])
hp[match.start()] = 'B'
row['ner_tags'] = "".join(hp)
outer_counter += inner_counter
print(f"Changes: {outer_counter - outer_counter_old}")
i += 1
if outer_counter_old == outer_counter:
break
else:
outer_counter_old = outer_counter
return df
# Regex for finding inconsistent I-tags after other I-tags (I-tags that are not continuation of the same tag)
def inconsistent_I_after_I(text):
return re.finditer(r'(?<=I-(\w+) )(?:I-(?!\1)\w+)', text)
# Helper method for removing inconsistent I-tags after other I-tags
def replace_inconsistent_I_after_I(df):
# Iterate until no more changes
i = 0
while True:
outer_counter_old = 0
outer_counter = 0
print(f"Iteration: {i+1}")
for idx, row in df.iterrows():
matches = inconsistent_I_after_I(row['ner_tags'])
inner_counter = 0
for match in matches:
inner_counter += 1
hp = list(row['ner_tags'])
hp[match.start()] = 'B'
row['ner_tags'] = "".join(hp)
outer_counter += inner_counter
print(f"Changes: {outer_counter - outer_counter_old}")
i += 1
if outer_counter_old == outer_counter:
break
else:
outer_counter_old = outer_counter
return df
predicted_labels
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# Save predictions to .tsv file (line by line)
with open('train/out-transformer.tsv', 'w') as f:
for i in range(len(predicted_labels)):
f.write(' '.join([unique_labels[p] for p in predicted_labels[i]]) + '\n')
# Load predictions
predictions = pd.read_csv('train/out-transformer.tsv', header=None, delimiter='\t')
predictions.columns = ['ner_tags']
# Postprocessing
predictions = replace_incorrect_I_as_begin_tag(predictions)
predictions = replace_inconsistent_I_after_B(predictions)
predictions = replace_inconsistent_I_after_I(predictions)
Iteration: 1 Changes: 143 Iteration: 2 Changes: 0 Iteration: 1 Changes: 168 Iteration: 2 Changes: 14 Iteration: 3 Changes: 0 Iteration: 1 Changes: 17 Iteration: 2 Changes: 0
# Save predictions to .tsv file (line by line)
predictions.to_csv('dev-0/out.tsv', header=False, index=False, sep='\t')
from seqeval.metrics import classification_report
# Convert index to label
df_val = pd.DataFrame({'ner_tags': true_labels})
df_val['tokens'] = df_val['ner_tags'].apply(lambda x: [unique_labels[int(i)] for i in x])
predictions['tokens'] = predictions['ner_tags'].apply(lambda x: x.split())
# Classification report
print(classification_report(df_val['tokens'].tolist(), predictions['tokens'].tolist()))
precision recall f1-score support LOC 0.80 0.86 0.83 1835 MISC 0.72 0.70 0.71 921 ORG 0.66 0.69 0.67 1333 PER 0.74 0.78 0.76 1840 micro avg 0.74 0.77 0.76 5929 macro avg 0.73 0.76 0.74 5929 weighted avg 0.74 0.77 0.75 5929
GEVAL F1-BIO (dev): 0.75517