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attack_classification.py
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attack_classification.py
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import argparse
import os
import numpy as np
import dataloader
from train_classifier import Model
import criteria
import random
import tensorflow as tf
import tensorflow_hub as hub
import torch
import torch.nn as nn
from torch.utils.data import Dataset, DataLoader, SequentialSampler, TensorDataset
from BERT.tokenization import BertTokenizer
from BERT.modeling import BertForSequenceClassification, BertConfig
class USE(object):
def __init__(self, cache_path):
super(USE, self).__init__()
os.environ['TFHUB_CACHE_DIR'] = cache_path
module_url = "https://tfhub.dev/google/universal-sentence-encoder-large/3"
self.embed = hub.Module(module_url)
config = tf.ConfigProto()
config.gpu_options.allow_growth = True
self.sess = tf.Session(config=config)
self.build_graph()
self.sess.run([tf.global_variables_initializer(), tf.tables_initializer()])
def build_graph(self):
self.sts_input1 = tf.placeholder(tf.string, shape=(None))
self.sts_input2 = tf.placeholder(tf.string, shape=(None))
sts_encode1 = tf.nn.l2_normalize(self.embed(self.sts_input1), axis=1)
sts_encode2 = tf.nn.l2_normalize(self.embed(self.sts_input2), axis=1)
self.cosine_similarities = tf.reduce_sum(tf.multiply(sts_encode1, sts_encode2), axis=1)
clip_cosine_similarities = tf.clip_by_value(self.cosine_similarities, -1.0, 1.0)
self.sim_scores = 1.0 - tf.acos(clip_cosine_similarities)
def semantic_sim(self, sents1, sents2):
scores = self.sess.run(
[self.sim_scores],
feed_dict={
self.sts_input1: sents1,
self.sts_input2: sents2,
})
return scores
def pick_most_similar_words_batch(src_words, sim_mat, idx2word, ret_count=10, threshold=0.):
"""
embeddings is a matrix with (d, vocab_size)
"""
sim_order = np.argsort(-sim_mat[src_words, :])[:, 1:1 + ret_count]
sim_words, sim_values = [], []
for idx, src_word in enumerate(src_words):
sim_value = sim_mat[src_word][sim_order[idx]]
mask = sim_value >= threshold
sim_word, sim_value = sim_order[idx][mask], sim_value[mask]
sim_word = [idx2word[id] for id in sim_word]
sim_words.append(sim_word)
sim_values.append(sim_value)
return sim_words, sim_values
class NLI_infer_BERT(nn.Module):
def __init__(self,
pretrained_dir,
nclasses,
max_seq_length=128,
batch_size=32):
super(NLI_infer_BERT, self).__init__()
self.model = BertForSequenceClassification.from_pretrained(pretrained_dir, num_labels=nclasses).cuda()
# construct dataset loader
self.dataset = NLIDataset_BERT(pretrained_dir, max_seq_length=max_seq_length, batch_size=batch_size)
def text_pred(self, text_data, batch_size=32):
# Switch the model to eval mode.
self.model.eval()
# transform text data into indices and create batches
dataloader = self.dataset.transform_text(text_data, batch_size=batch_size)
probs_all = []
# for input_ids, input_mask, segment_ids in tqdm(dataloader, desc="Evaluating"):
for input_ids, input_mask, segment_ids in dataloader:
input_ids = input_ids.cuda()
input_mask = input_mask.cuda()
segment_ids = segment_ids.cuda()
with torch.no_grad():
logits = self.model(input_ids, segment_ids, input_mask)
probs = nn.functional.softmax(logits, dim=-1)
probs_all.append(probs)
return torch.cat(probs_all, dim=0)
class InputFeatures(object):
"""A single set of features of data."""
def __init__(self, input_ids, input_mask, segment_ids):
self.input_ids = input_ids
self.input_mask = input_mask
self.segment_ids = segment_ids
class NLIDataset_BERT(Dataset):
"""
Dataset class for Natural Language Inference datasets.
The class can be used to read preprocessed datasets where the premises,
hypotheses and labels have been transformed to unique integer indices
(this can be done with the 'preprocess_data' script in the 'scripts'
folder of this repository).
"""
def __init__(self,
pretrained_dir,
max_seq_length=128,
batch_size=32):
"""
Args:
data: A dictionary containing the preprocessed premises,
hypotheses and labels of some dataset.
padding_idx: An integer indicating the index being used for the
padding token in the preprocessed data. Defaults to 0.
max_premise_length: An integer indicating the maximum length
accepted for the sequences in the premises. If set to None,
the length of the longest premise in 'data' is used.
Defaults to None.
max_hypothesis_length: An integer indicating the maximum length
accepted for the sequences in the hypotheses. If set to None,
the length of the longest hypothesis in 'data' is used.
Defaults to None.
"""
self.tokenizer = BertTokenizer.from_pretrained(pretrained_dir, do_lower_case=True)
self.max_seq_length = max_seq_length
self.batch_size = batch_size
def convert_examples_to_features(self, examples, max_seq_length, tokenizer):
"""Loads a data file into a list of `InputBatch`s."""
features = []
for (ex_index, text_a) in enumerate(examples):
tokens_a = tokenizer.tokenize(' '.join(text_a))
# Account for [CLS] and [SEP] with "- 2"
if len(tokens_a) > max_seq_length - 2:
tokens_a = tokens_a[:(max_seq_length - 2)]
tokens = ["[CLS]"] + tokens_a + ["[SEP]"]
segment_ids = [0] * len(tokens)
input_ids = tokenizer.convert_tokens_to_ids(tokens)
# The mask has 1 for real tokens and 0 for padding tokens. Only real
# tokens are attended to.
input_mask = [1] * len(input_ids)
# Zero-pad up to the sequence length.
padding = [0] * (max_seq_length - len(input_ids))
input_ids += padding
input_mask += padding
segment_ids += padding
assert len(input_ids) == max_seq_length
assert len(input_mask) == max_seq_length
assert len(segment_ids) == max_seq_length
features.append(
InputFeatures(input_ids=input_ids,
input_mask=input_mask,
segment_ids=segment_ids))
return features
def transform_text(self, data, batch_size=32):
# transform data into seq of embeddings
eval_features = self.convert_examples_to_features(data,
self.max_seq_length, self.tokenizer)
all_input_ids = torch.tensor([f.input_ids for f in eval_features], dtype=torch.long)
all_input_mask = torch.tensor([f.input_mask for f in eval_features], dtype=torch.long)
all_segment_ids = torch.tensor([f.segment_ids for f in eval_features], dtype=torch.long)
eval_data = TensorDataset(all_input_ids, all_input_mask, all_segment_ids)
# Run prediction for full data
eval_sampler = SequentialSampler(eval_data)
eval_dataloader = DataLoader(eval_data, sampler=eval_sampler, batch_size=batch_size)
return eval_dataloader
def attack(text_ls, true_label, predictor, stop_words_set, word2idx, idx2word, cos_sim, sim_predictor=None,
import_score_threshold=-1., sim_score_threshold=0.5, sim_score_window=15, synonym_num=50,
batch_size=32):
# first check the prediction of the original text
orig_probs = predictor([text_ls]).squeeze()
orig_label = torch.argmax(orig_probs)
orig_prob = orig_probs.max()
if true_label != orig_label:
return '', 0, orig_label, orig_label, 0
else:
len_text = len(text_ls)
if len_text < sim_score_window:
sim_score_threshold = 0.1 # shut down the similarity thresholding function
half_sim_score_window = (sim_score_window - 1) // 2
num_queries = 1
# get the pos and verb tense info
pos_ls = criteria.get_pos(text_ls)
# get importance score
leave_1_texts = [text_ls[:ii] + ['<oov>'] + text_ls[min(ii + 1, len_text):] for ii in range(len_text)]
leave_1_probs = predictor(leave_1_texts, batch_size=batch_size)
num_queries += len(leave_1_texts)
leave_1_probs_argmax = torch.argmax(leave_1_probs, dim=-1)
import_scores = (orig_prob - leave_1_probs[:, orig_label] + (leave_1_probs_argmax != orig_label).float() * (
leave_1_probs.max(dim=-1)[0] - torch.index_select(orig_probs, 0,
leave_1_probs_argmax))).data.cpu().numpy()
# get words to perturb ranked by importance scorefor word in words_perturb
words_perturb = []
for idx, score in sorted(enumerate(import_scores), key=lambda x: x[1], reverse=True):
try:
if score > import_score_threshold and text_ls[idx] not in stop_words_set:
words_perturb.append((idx, text_ls[idx]))
except:
print(idx, len(text_ls), import_scores.shape, text_ls, len(leave_1_texts))
# find synonyms
words_perturb_idx = [word2idx[word] for idx, word in words_perturb if word in word2idx]
synonym_words, _ = pick_most_similar_words_batch(words_perturb_idx, cos_sim, idx2word, synonym_num, 0.5)
synonyms_all = []
for idx, word in words_perturb:
if word in word2idx:
synonyms = synonym_words.pop(0)
if synonyms:
synonyms_all.append((idx, synonyms))
# start replacing and attacking
text_prime = text_ls[:]
text_cache = text_prime[:]
num_changed = 0
for idx, synonyms in synonyms_all:
new_texts = [text_prime[:idx] + [synonym] + text_prime[min(idx + 1, len_text):] for synonym in synonyms]
new_probs = predictor(new_texts, batch_size=batch_size)
# compute semantic similarity
if idx >= half_sim_score_window and len_text - idx - 1 >= half_sim_score_window:
text_range_min = idx - half_sim_score_window
text_range_max = idx + half_sim_score_window + 1
elif idx < half_sim_score_window and len_text - idx - 1 >= half_sim_score_window:
text_range_min = 0
text_range_max = sim_score_window
elif idx >= half_sim_score_window and len_text - idx - 1 < half_sim_score_window:
text_range_min = len_text - sim_score_window
text_range_max = len_text
else:
text_range_min = 0
text_range_max = len_text
semantic_sims = \
sim_predictor.semantic_sim([' '.join(text_cache[text_range_min:text_range_max])] * len(new_texts),
list(map(lambda x: ' '.join(x[text_range_min:text_range_max]), new_texts)))[0]
num_queries += len(new_texts)
if len(new_probs.shape) < 2:
new_probs = new_probs.unsqueeze(0)
new_probs_mask = (orig_label != torch.argmax(new_probs, dim=-1)).data.cpu().numpy()
# prevent bad synonyms
new_probs_mask *= (semantic_sims >= sim_score_threshold)
# prevent incompatible pos
synonyms_pos_ls = [criteria.get_pos(new_text[max(idx - 4, 0):idx + 5])[min(4, idx)]
if len(new_text) > 10 else criteria.get_pos(new_text)[idx] for new_text in new_texts]
pos_mask = np.array(criteria.pos_filter(pos_ls[idx], synonyms_pos_ls))
new_probs_mask *= pos_mask
if np.sum(new_probs_mask) > 0:
text_prime[idx] = synonyms[(new_probs_mask * semantic_sims).argmax()]
num_changed += 1
break
else:
new_label_probs = new_probs[:, orig_label] + torch.from_numpy(
(semantic_sims < sim_score_threshold) + (1 - pos_mask).astype(float)).float().cuda()
new_label_prob_min, new_label_prob_argmin = torch.min(new_label_probs, dim=-1)
if new_label_prob_min < orig_prob:
text_prime[idx] = synonyms[new_label_prob_argmin]
num_changed += 1
text_cache = text_prime[:]
return ' '.join(text_prime), num_changed, orig_label, torch.argmax(predictor([text_prime])), num_queries
def random_attack(text_ls, true_label, predictor, perturb_ratio, stop_words_set, word2idx, idx2word, cos_sim,
sim_predictor=None, import_score_threshold=-1., sim_score_threshold=0.5, sim_score_window=15,
synonym_num=50, batch_size=32):
# first check the prediction of the original text
orig_probs = predictor([text_ls]).squeeze()
orig_label = torch.argmax(orig_probs)
orig_prob = orig_probs.max()
if true_label != orig_label:
return '', 0, orig_label, orig_label, 0
else:
len_text = len(text_ls)
if len_text < sim_score_window:
sim_score_threshold = 0.1 # shut down the similarity thresholding function
half_sim_score_window = (sim_score_window - 1) // 2
num_queries = 1
# get the pos and verb tense info
pos_ls = criteria.get_pos(text_ls)
# randomly get perturbed words
perturb_idxes = random.sample(range(len_text), int(len_text * perturb_ratio))
words_perturb = [(idx, text_ls[idx]) for idx in perturb_idxes]
# find synonyms
words_perturb_idx = [word2idx[word] for idx, word in words_perturb if word in word2idx]
synonym_words, _ = pick_most_similar_words_batch(words_perturb_idx, cos_sim, idx2word, synonym_num, 0.5)
synonyms_all = []
for idx, word in words_perturb:
if word in word2idx:
synonyms = synonym_words.pop(0)
if synonyms:
synonyms_all.append((idx, synonyms))
# start replacing and attacking
text_prime = text_ls[:]
text_cache = text_prime[:]
num_changed = 0
for idx, synonyms in synonyms_all:
new_texts = [text_prime[:idx] + [synonym] + text_prime[min(idx + 1, len_text):] for synonym in synonyms]
new_probs = predictor(new_texts, batch_size=batch_size)
# compute semantic similarity
if idx >= half_sim_score_window and len_text - idx - 1 >= half_sim_score_window:
text_range_min = idx - half_sim_score_window
text_range_max = idx + half_sim_score_window + 1
elif idx < half_sim_score_window and len_text - idx - 1 >= half_sim_score_window:
text_range_min = 0
text_range_max = sim_score_window
elif idx >= half_sim_score_window and len_text - idx - 1 < half_sim_score_window:
text_range_min = len_text - sim_score_window
text_range_max = len_text
else:
text_range_min = 0
text_range_max = len_text
semantic_sims = \
sim_predictor.semantic_sim([' '.join(text_cache[text_range_min:text_range_max])] * len(new_texts),
list(map(lambda x: ' '.join(x[text_range_min:text_range_max]), new_texts)))[0]
num_queries += len(new_texts)
if len(new_probs.shape) < 2:
new_probs = new_probs.unsqueeze(0)
new_probs_mask = (orig_label != torch.argmax(new_probs, dim=-1)).data.cpu().numpy()
# prevent bad synonyms
new_probs_mask *= (semantic_sims >= sim_score_threshold)
# prevent incompatible pos
synonyms_pos_ls = [criteria.get_pos(new_text[max(idx - 4, 0):idx + 5])[min(4, idx)]
if len(new_text) > 10 else criteria.get_pos(new_text)[idx] for new_text in new_texts]
pos_mask = np.array(criteria.pos_filter(pos_ls[idx], synonyms_pos_ls))
new_probs_mask *= pos_mask
if np.sum(new_probs_mask) > 0:
text_prime[idx] = synonyms[(new_probs_mask * semantic_sims).argmax()]
num_changed += 1
break
else:
new_label_probs = new_probs[:, orig_label] + torch.from_numpy(
(semantic_sims < sim_score_threshold) + (1 - pos_mask).astype(float)).float().cuda()
new_label_prob_min, new_label_prob_argmin = torch.min(new_label_probs, dim=-1)
if new_label_prob_min < orig_prob:
text_prime[idx] = synonyms[new_label_prob_argmin]
num_changed += 1
text_cache = text_prime[:]
return ' '.join(text_prime), num_changed, orig_label, torch.argmax(predictor([text_prime])), num_queries
def main():
parser = argparse.ArgumentParser()
## Required parameters
parser.add_argument("--dataset_path",
type=str,
required=True,
help="Which dataset to attack.")
parser.add_argument("--nclasses",
type=int,
default=2,
help="How many classes for classification.")
parser.add_argument("--target_model",
type=str,
required=True,
choices=['wordLSTM', 'bert', 'wordCNN'],
help="Target models for text classification: fasttext, charcnn, word level lstm "
"For NLI: InferSent, ESIM, bert-base-uncased")
parser.add_argument("--target_model_path",
type=str,
required=True,
help="pre-trained target model path")
parser.add_argument("--word_embeddings_path",
type=str,
default='',
help="path to the word embeddings for the target model")
parser.add_argument("--counter_fitting_embeddings_path",
type=str,
required=True,
help="path to the counter-fitting embeddings we used to find synonyms")
parser.add_argument("--counter_fitting_cos_sim_path",
type=str,
default='',
help="pre-compute the cosine similarity scores based on the counter-fitting embeddings")
parser.add_argument("--USE_cache_path",
type=str,
required=True,
help="Path to the USE encoder cache.")
parser.add_argument("--output_dir",
type=str,
default='adv_results',
help="The output directory where the attack results will be written.")
## Model hyperparameters
parser.add_argument("--sim_score_window",
default=15,
type=int,
help="Text length or token number to compute the semantic similarity score")
parser.add_argument("--import_score_threshold",
default=-1.,
type=float,
help="Required mininum importance score.")
parser.add_argument("--sim_score_threshold",
default=0.7,
type=float,
help="Required minimum semantic similarity score.")
parser.add_argument("--synonym_num",
default=50,
type=int,
help="Number of synonyms to extract")
parser.add_argument("--batch_size",
default=32,
type=int,
help="Batch size to get prediction")
parser.add_argument("--data_size",
default=1000,
type=int,
help="Data size to create adversaries")
parser.add_argument("--perturb_ratio",
default=0.,
type=float,
help="Whether use random perturbation for ablation study")
parser.add_argument("--max_seq_length",
default=128,
type=int,
help="max sequence length for BERT target model")
args = parser.parse_args()
if os.path.exists(args.output_dir) and os.listdir(args.output_dir):
print("Output directory ({}) already exists and is not empty.".format(args.output_dir))
else:
os.makedirs(args.output_dir, exist_ok=True)
# get data to attack
texts, labels = dataloader.read_corpus(args.dataset_path)
data = list(zip(texts, labels))
data = data[:args.data_size] # choose how many samples for adversary
print("Data import finished!")
# construct the model
print("Building Model...")
if args.target_model == 'wordLSTM':
model = Model(args.word_embeddings_path, nclasses=args.nclasses).cuda()
checkpoint = torch.load(args.target_model_path, map_location='cuda:0')
model.load_state_dict(checkpoint)
elif args.target_model == 'wordCNN':
model = Model(args.word_embeddings_path, nclasses=args.nclasses, hidden_size=100, cnn=True).cuda()
checkpoint = torch.load(args.target_model_path, map_location='cuda:0')
model.load_state_dict(checkpoint)
elif args.target_model == 'bert':
model = NLI_infer_BERT(args.target_model_path, nclasses=args.nclasses, max_seq_length=args.max_seq_length)
predictor = model.text_pred
print("Model built!")
# prepare synonym extractor
# build dictionary via the embedding file
idx2word = {}
word2idx = {}
print("Building vocab...")
with open(args.counter_fitting_embeddings_path, 'r') as ifile:
for line in ifile:
word = line.split()[0]
if word not in idx2word:
idx2word[len(idx2word)] = word
word2idx[word] = len(idx2word) - 1
print("Building cos sim matrix...")
if args.counter_fitting_cos_sim_path:
# load pre-computed cosine similarity matrix if provided
print('Load pre-computed cosine similarity matrix from {}'.format(args.counter_fitting_cos_sim_path))
cos_sim = np.load(args.counter_fitting_cos_sim_path)
else:
# calculate the cosine similarity matrix
print('Start computing the cosine similarity matrix!')
embeddings = []
with open(args.counter_fitting_embeddings_path, 'r') as ifile:
for line in ifile:
embedding = [float(num) for num in line.strip().split()[1:]]
embeddings.append(embedding)
embeddings = np.array(embeddings)
product = np.dot(embeddings, embeddings.T)
norm = np.linalg.norm(embeddings, axis=1, keepdims=True)
cos_sim = product / np.dot(norm, norm.T)
print("Cos sim import finished!")
# build the semantic similarity module
use = USE(args.USE_cache_path)
# start attacking
orig_failures = 0.
adv_failures = 0.
changed_rates = []
nums_queries = []
orig_texts = []
adv_texts = []
true_labels = []
new_labels = []
log_file = open(os.path.join(args.output_dir, 'results_log'), 'a')
stop_words_set = criteria.get_stopwords()
print('Start attacking!')
for idx, (text, true_label) in enumerate(data):
if idx % 20 == 0:
print('{} samples out of {} have been finished!'.format(idx, args.data_size))
if args.perturb_ratio > 0.:
new_text, num_changed, orig_label, \
new_label, num_queries = random_attack(text, true_label, predictor, args.perturb_ratio, stop_words_set,
word2idx, idx2word, cos_sim, sim_predictor=use,
sim_score_threshold=args.sim_score_threshold,
import_score_threshold=args.import_score_threshold,
sim_score_window=args.sim_score_window,
synonym_num=args.synonym_num,
batch_size=args.batch_size)
else:
new_text, num_changed, orig_label, \
new_label, num_queries = attack(text, true_label, predictor, stop_words_set,
word2idx, idx2word, cos_sim, sim_predictor=use,
sim_score_threshold=args.sim_score_threshold,
import_score_threshold=args.import_score_threshold,
sim_score_window=args.sim_score_window,
synonym_num=args.synonym_num,
batch_size=args.batch_size)
if true_label != orig_label:
orig_failures += 1
else:
nums_queries.append(num_queries)
if true_label != new_label:
adv_failures += 1
changed_rate = 1.0 * num_changed / len(text)
if true_label == orig_label and true_label != new_label:
changed_rates.append(changed_rate)
orig_texts.append(' '.join(text))
adv_texts.append(new_text)
true_labels.append(true_label)
new_labels.append(new_label)
message = 'For target model {}: original accuracy: {:.3f}%, adv accuracy: {:.3f}%, ' \
'avg changed rate: {:.3f}%, num of queries: {:.1f}\n'.format(args.target_model,
(1-orig_failures/1000)*100,
(1-adv_failures/1000)*100,
np.mean(changed_rates)*100,
np.mean(nums_queries))
print(message)
log_file.write(message)
with open(os.path.join(args.output_dir, 'adversaries.txt'), 'w') as ofile:
for orig_text, adv_text, true_label, new_label in zip(orig_texts, adv_texts, true_labels, new_labels):
ofile.write('orig sent ({}):\t{}\nadv sent ({}):\t{}\n\n'.format(true_label, orig_text, new_label, adv_text))
if __name__ == "__main__":
main()