def prepare_word_sets(self, corpus_dir, train_b, valid_b, test_b):
if self.print_level > 0:
print '-> Preparing word sets'
word_sets_file = '%s/word_sets.pkl' % corpus_dir
print (word_sets_file)
# if not exist, will create from traning set and store
# word_sets contains all one gram and two grams after removing stopwords
self.word_sets = load_from_pkl(word_sets_file)
if self.word_sets is None:
# Prepare list of words (and pairs) that appear in training set
# note that if tuples = [1], then parser,parse('one two three') -> ['one', 'two', 'three]
# if tuples = [2], then parser.parse('one two three') -> ['one two', 'two three']
# if tuples = [1,2], then parser,parse('one two three) -> ['one', 'two', 'three', 'one two', 'two three']
parser = SimpleWordParser(tuples=[1,2])
words = set()
for exam in [train_b, valid_b, test_b]:
if exam is not None:
words.update(np.concatenate([self._words_to_names(parser.parse(qst)) for qst in exam['question']]))
words.update(np.concatenate([self._words_to_names(parser.parse(ans)) for ans in exam['answer']]))
words.difference_update(['']) # ignore empty word
words = sorted(words)
if self.print_level > 1:
print '%d word sets: ...%s...' % (len(words), words[::5000])
self.word_sets = words
save_to_pkl(word_sets_file, self.word_sets)
def add_qa_features(train):
'''
Add simple features computed for each question
These features are:
1. Does the question contains 'which'
2. Does the question contains '___'
3. Does the question contains 'not', 'except', 'least'
4. Number of words in question
5. Average Number of words for answers of this question
'''
parser = SimpleWordParser()
train['q_which'] = np.array([('which' in qst.lower().split(' ')) for qst in train['question']])
train['q____'] = np.array([('___' in qst) for qst in train['question']])
not_words_weights = {'NOT':1, 'EXCEPT':1, 'LEAST':1} # note the 'not' words can have unequal weights
train['q_not'] = np.array([np.max([not_words_weights.get(w,0) for w in qst.split(' ')]) for qst in train['question']])
train['q_num_words'] = np.array([len(parser.parse(qst)) for qst in train['question']])
train['a_num_words'] = np.array([np.mean([len(parser.parse(ans)) for ans in anss]) for anss in np.array(train[['answerA','answerB','answerC','answerD']])])
def read(self, htmldir, outfile, stop_words=set(), pos_words=set(), page_name_word_sets=None, corpus_words=None,
page_title_ignore_suffixes=['-1', '-2', '- Advanced'],
ignore_sections=set(),
min_pos_words_in_page_name=0, min_pos_words_in_section=0,
use_all_pages_match_pos_word=False, use_all_pages_match_sets=False, always_use_first_section=False,
action='write'):
# reset the class variables every time since these class variables are static variables that belongs to the Class, not a particular class object
self._reset(outfile=outfile, stop_words=stop_words, pos_words=pos_words, page_name_word_sets=page_name_word_sets, corpus_words=corpus_words,
min_pos_words_in_page_name=min_pos_words_in_page_name, min_pos_words_in_section=min_pos_words_in_section,
use_all_pages_match_pos_word=use_all_pages_match_pos_word, use_all_pages_match_sets=use_all_pages_match_sets,
always_use_first_section=always_use_first_section,
action=action)
parser = SimpleWordParser(tolower=True, ascii_conversion=True, ignore_special_words=False)
# the action variable is 'write', so _start_action will open the output file and write to it
self._start_action()
page_name, section_name, section_in_page = None, None, 0
page_name_words, section_words = [], []
start_time = time.time()
# we only include x.html while x is a scalar, meaning we ignore the table html
filenames = ['%s/%s'%(htmldir,fname) for fname in os.listdir(htmldir) if re.match(r'(\d+).html', fname) != None]
assert len(filenames)>0
for ifname,fname in enumerate(filenames):
print 'Reading %s' % fname
with open(fname, 'rb') as myfile:
# this is a very long string
text = myfile.read()
soup = BeautifulSoup(text, 'lxml')
if soup.h1 is None:
print 'Could not find page title in file %s - skipping' % fname
continue
# note that the html file could have many h1 tags, while only the first one is the title
page_name = soup.h1.text.strip()
# e.g some of the page name has Momentum-1, where the suffix '-1' should be eliminated
for ptis in page_title_ignore_suffixes:
if page_name.endswith(ptis):
page_name = page_name[:-len(ptis)]
break
page_name_words = parser.parse(page_name)
# page name = surface processes and landforms __0
# this is write fo file with the page name
page_name = CorpusReader.part_name_from_words(page_name_words, ifname)
print 'page name = %s' % page_name
self._add_page(page_name, page_name_words)
# using the section_re to split the text(without title)
parts = re.split('(<h[1-4])', text)
# start from 3 because the first 3 parts belong to the title <h1> tag, which should be skipped
for ipart in range(3,len(parts),2):
# odd number of parts are splitter tags
# even number of parts are the contents of the tag
soup = BeautifulSoup(parts[ipart] + parts[ipart+1], 'lxml')
section_name = soup.find(parts[ipart][1:]).text.strip().lower()
# some section that has name that matches set(['review', 'practice', 'references', 'explore more.*'])
# we know this is a review section that does not contains information about science knowledge
if np.any([(re.match(isr, section_name) is not None) for isr in ignore_sections]):
continue
section_name_words = parser.parse(section_name)
section_in_page = (ipart - 1) / 2
# only select text from all the <p> tags within each section
text = ''
for p in soup.find_all('p'):
text += p.next.strip()
# this will replace some of the symbols to Eng, e.g 'Δ' -> 'Delta'
text = HtmlReader.parse_text(text)
# word tokenizing
words = parser.parse(text)
section_words = words
# for each filename, add those sections, which is write to files
# note that section_name is not written to file.
self._add_section(page_name, page_name_words, section_name, section_name_words, section_in_page, section_words)
end_time = time.time()
print 'read_html total time = %.1f secs.' % (end_time-start_time)
print 'Read %d pages, %d sections; applied action on %d sections' % (self.num_pages, self.num_sections, self.num_section_action)
self._end_action()
return self._locdic
def prp_binary_dataf(train):
"""
:param train: pandas df
:return:
this function expand each question into 4 rows, one for each answer
e.g How many hours in a day? A.22 B.23 C.24 D.25 other_features
Now becomes
How many hours in a day? A.22 other_fearures False
How many hours in a day? B.23 other_fearures False
How many hours in a day? C.24 other_fearures True
How many hours in a day? D.25 other_fearures False
The reason of doing this is we want to fit a binary classifier than gives scores to each ans for given question
"""
stemmer = PorterStemmer()
parser = SimpleWordParser(word_func=stemmer.stem, min_word_length=1, tolower=True, ascii_conversion=True, ignore_special_words=False)
indices, questions, answers, correct, ans_names, more_cols_vals = [], [], [], [], [], []
is_all, is_both, is_none, keywords = [], [], [], []
if 'correctAnswer' in train.columns:
correct_answer = np.array(train['correctAnswer'])
else:
correct_answer = np.zeros(len(train))
more_cols = [col for col in train.columns if col not in ['question', 'answerA', 'answerB', 'answerC', 'answerD', 'correctAnswer']]
for idx,(qst,ansA,ansB,ansC,ansD),cor,mcols in zip(train.index, np.array(train[['question', 'answerA', 'answerB', 'answerC', 'answerD']]),
correct_answer, np.array(train[more_cols])):
for ia,(ic,ans) in enumerate(zip(['A','B','C','D'],[ansA, ansB, ansC, ansD])):
indices.append(idx)
questions.append(qst)
a_ans, a_all, a_both, a_none, a_keywords = ans, 0, 0, 0, 0
if ans.endswith(MARK_ANSWER_ALL):
a_ans = ans[:-len(MARK_ANSWER_ALL)]
a_all = 1
elif ans.endswith(MARK_ANSWER_BOTH):
a_ans = ans[:-len(MARK_ANSWER_BOTH)]
a_both = 1
elif ans.endswith(MARK_ANSWER_NONE):
a_ans = ans[:-len(MARK_ANSWER_NONE)]
a_none = 1
else:
words = parser.parse(ans)
if 'both' in words:
a_both = 0.5
# note that this is not used
if stemmer.stem('investigation') in words:
a_keywords = 1
answers.append(a_ans)
is_all.append(a_all)
is_both.append(a_both)
is_none.append(a_none)
keywords.append(a_keywords)
# this is for test set
if cor==0:
correct.append(0) # no 'correctAnswer' column -> set correct=0 for all answers
else:
correct.append(1 if ia==(ord(cor)-ord('A')) else 0)
ans_names.append(ic)
more_cols_vals.append(mcols)
pdict = {'ID': indices, 'question': questions, 'answer': answers, 'correct': correct, 'ans_name': ans_names,
'is_all': is_all, 'is_both': is_both, 'is_none': is_none} #, 'ans_keywords': keywords}
for icol,mcol in enumerate(more_cols):
pdict[mcol] = np.array([vals[icol] for vals in more_cols_vals])
return pd.DataFrame(pdict)
def create_corpus(
self,
train_b,
valid_b,
min_pos_words_in_page_name,
min_pos_words_in_section,
only_first_section_per_page=False,
max_sections_per_page=99999999,
use_all_pages_match_pos_word=True,
use_all_pages_match_answer=True,
pages_to_use=None,
always_use_first_section=False,
max_read_lines=99900000000,
reread=False,
):
print "=> Creating corpus"
self.min_pos_words_in_page_name = min_pos_words_in_page_name
self.min_pos_words_in_section = min_pos_words_in_section
self.only_first_section_per_page = only_first_section_per_page
self.max_sections_per_page = max_sections_per_page
self.use_all_pages_match_pos_word = use_all_pages_match_pos_word
self.use_all_pages_match_answer = use_all_pages_match_answer
self.always_use_first_section = always_use_first_section
exams_words_file = "%s/%s_%s" % (self.wiki_dir, self.wiki_name, WikiCorpusBuilder.EXAMS_WORDS_FILE)
pos_words_file = "%s/%s_%.4f_%s%s" % (
self.wiki_dir,
self.wiki_name,
self.wiki_common_words_min_frac,
"wsw_" if self.use_wiki_stop_words else "",
WikiCorpusBuilder.POSITIVE_WORDS_FILE,
)
answers_file = "%s/%s_%s" % (self.wiki_dir, self.wiki_name, WikiCorpusBuilder.ANSWERS_FILE)
corpus_file = "%s/%s_%.4f_%s%.4f_%d_%d_%s_%s_%s" % (
self.wiki_dir,
self.wiki_name,
self.wiki_common_words_min_frac,
"wsw_" if self.use_wiki_stop_words else "",
self.wiki_uncommon_words_max_frac,
self.min_pos_words_in_page_name,
self.min_pos_words_in_section,
self.use_all_pages_match_pos_word,
self.use_all_pages_match_answer,
self.always_use_first_section,
)
if pages_to_use is not None:
corpus_file = "%s_pn%d" % (corpus_file, len(pages_to_use))
corpus_file = "%s_%s" % (corpus_file, WikiCorpusBuilder.CORPUS_FILE)
print "Corpus file: %s" % corpus_file
gc.collect()
# Get the corpus of the train+validation sets
if reread or (not os.path.exists(pos_words_file)) or (not os.path.exists(answers_file)):
# Get all the words that appear in the exams
if valid_b is None:
all_exams = train_b[["ID", "question", "answer"]]
else:
all_exams = pd.concat([train_b[["ID", "question", "answer"]], valid_b[["ID", "question", "answer"]]])
parser = SimpleWordParser()
exams_locdic = build_training_location_dictionary(
all_exams,
parser=parser,
use_answers=True,
min_word_docs_frac=0,
max_word_docs_frac=1.0,
min_word_count_frac=0,
max_word_count_frac=1.0,
ascii_conversion=True,
)
self.exams_words = exams_locdic.word_ids.keys()
# Set the "positive_words" as all the words from the train(+validation) files that are uncommon in Wiki
self.pos_words = set(self.exams_words).intersection(self.wiki_uncommon_words)
# Get all the answers (each answer = a set of words)
self.all_answers = set()
for answer in all_exams["answer"]:
self.all_answers.add(tuple(sorted(parser.parse(answer))))
save_to_pkl(exams_words_file, self.exams_words)
save_to_pkl(pos_words_file, self.pos_words)
save_to_pkl(answers_file, self.all_answers)
else:
self.exams_words = load_from_pkl(exams_words_file)
self.pos_words = load_from_pkl(pos_words_file)
self.all_answers = load_from_pkl(answers_file)
print "There are %d positive words (%d wiki uncommon words, %d words from exams)" % (
len(self.pos_words),
len(self.wiki_uncommon_words),
len(self.exams_words),
)
print "There are a total of %d unique answers" % len(self.all_answers)
print "Using %d stop words" % (len(self.stop_words))
if pages_to_use is None:
use_pages = self.pages_in_categories
else:
use_pages = pages_to_use
print "Considering %d pages" % len(use_pages)
if reread or (not os.path.exists(corpus_file)):
print "Writing %s corpus to %s" % (self.wiki_name, corpus_file)
ld = self.wikir.read(
wikifile="%s/%s" % (self.wiki_dir, self.wiki_file),
outfile=corpus_file,
only_first_section_per_page=self.only_first_section_per_page,
max_sections_per_page=self.max_sections_per_page,
use_pages=use_pages,
max_read_lines=max_read_lines,
stop_words=self.stop_words,
pos_words=self.pos_words,
page_name_word_sets=self.all_answers,
corpus_words=None, ##set(exams_locdic.word_ids.keys()),
min_pos_words_in_page_name=self.min_pos_words_in_page_name,
min_pos_words_in_section=self.min_pos_words_in_section,
use_all_pages_match_pos_word=self.use_all_pages_match_pos_word,
use_all_pages_match_sets=self.use_all_pages_match_answer,
always_use_first_section=self.always_use_first_section,
action="write",
)
print "Done writing corpus"
gc.collect()
return corpus_file
def read(self, dir, outfile, stop_words=set(), pos_words=set(),
first_line_regexp='^CHAPTER',
ignore_sections=set(), section_end_regexp='^\s*$',
action='write'):
self._reset(outfile=outfile, stop_words=stop_words, pos_words=pos_words, page_name_word_sets=set(), corpus_words=None,
min_pos_words_in_page_name=0, min_pos_words_in_section=0,
use_all_pages_match_pos_word=True, use_all_pages_match_sets=True, always_use_first_section=False,
action=action)
parser = SimpleWordParser(tolower=True, ascii_conversion=True, ignore_special_words=False)
first_line_re = re.compile(first_line_regexp)
section_end_re = re.compile(section_end_regexp)
self._start_action()
page_name, section_name, section_in_page = None, None, 0
page_name_words, section_words = [], []
start_time = time.time()
# this includes all the .text files which are converted from pdf books
filenames = ['%s/%s'%(dir,fname) for fname in os.listdir(dir) if fname.endswith('.text')]
assert len(filenames)>0
for ifname,fname in enumerate(filenames):
print 'Reading %s' % fname
page_name = fname[:-5]
page_name_words = []
# 1 file is 1 page
print 'page name = %s' % page_name
self._add_page(page_name, page_name_words)
section_in_page = 0
section_name, section_name_words = '', []
with open (fname, 'rb') as myfile:
found_first_line = False
text = ''
# will search for the first_line_re in the file, e.g 'C HAPTER' for CK12-textbooks
# given that we find first line, if we find a line that contains section_end_re, that is multiple spaces,
# we write lines we have seen so far to new section
# it turns out that if we set each paragraph a section, there are more than 5000 sections for 1 page(file)
# to actually add a section, we also use _add_section method in CorpusReader.py to check if it is a valid section.
# For instance, we ignore it if section has too few words or if it merely contains figures and formulas
for line in myfile:
line = line.strip()
# note that the online pdf to text converter that I used will produce some of the title caption as
# 'V IRAL S EXUALLY T RANSMITTED I NFECTIONS', where the space between chars should be substituted
line = re.sub('(?<=[A-Z]{1})(\s)(?=[A-Z]{2,})', '', line)
if found_first_line:
if re.match(section_end_re, line) is not None:
# Add previous section
section_words = parser.parse(text)
self._add_section(page_name, page_name_words, section_name, section_name_words, section_in_page, section_words)
section_in_page += 1
section_name, section_name_words = '', []
text = ''
else:
text += ' ' + line
else:
if re.match(first_line_re, line) is not None:
found_first_line = True
assert found_first_line, 'Could not find first line in file %s' % fname
# Add last section
section_words = parser.parse(text)
self._add_section(page_name, page_name_words, section_name, section_name_words, section_in_page, section_words)
end_time = time.time()
print 'read_text total time = %.1f secs.' % (end_time-start_time)
print 'Read %d pages, %d sections; applied action on %d sections' % (self.num_pages, self.num_sections, self.num_section_action)
self._end_action()
return self._locdic
