def main():
"""
Analyzes scraped pages using scikit-learn.LDA
"""
# The number of topics
K = 10
# no of documents
D = 300
n_features = 1000
# Our vocabulary
vocab = list(set(file('./vocab').readlines()))
W = len(vocab)
# Add terms and topics to the DB
db.init()
db.add_terms(vocab)
db.add_topics(K)
olda = onlineldavb.OnlineLDA(vocab, K, D, 1./K, 1./K, 1024., 0.7)
# grab documents
### Load your scraped pages, re-tokenize, and vectorize result.
docset, docnames = [], []
for filename in os.listdir(os.getcwd()):
if filename.endswith('.html'):
tree = html.parse(filename)
try: encoding = tree.xpath('//meta/@charset')[0]
except IndexError: encoding = 'utf-8'
with open(filename) as page:
rawtext = page.read()
try: rawtext = rawtext.decode(encoding, errors='backslashreplace')
except TypeError: continue
# encoding issues, see http://stackoverflow.com/questions/19527279/python-unicode-to-ascii-conversion
docset += [clean_html(rawtext)]
docnames += [filename[:-5]]
if not(len(docset) % 10): print("loaded " + str(len(docset)) + " documents")
# Give them to online LDA
# Also computes an estimate of held-out perplexity
(wordids, wordcts) = onlineldavb.parse_doc_list(docset, olda._vocab)
(gamma, bound) = olda.update_lambda(wordids, wordcts)
# Arrays for adding batches of data to the DB
# doc_array = []
# doc_term_array = []
# for d in range(len(docnames)):
# doc_array.append((docnames[d], docset[d]))
doc_array = zip(docnames, docset)
# Add a batch of docs to the DB; this is the one DB task that is not in
# the separate DB write thread since later tasks depend on having doc ids.
# Since writes take so long, this also balaces the two threads time-wise.
doc_ids = db.add_docs(doc_array)
doc_topic_array = []
for d in range(len(gamma)):
doc_size = len(docset[d])
for k in range(len(gamma[d])):
doc_topic_array.append((doc_ids[d], k, gamma[d][k], gamma[d][k]/doc_size))
db.add_doc_topics(doc_topic_array)
perwordbound = bound * len(docset) / (D * sum(map(sum, wordcts)))
print '%d: rho_t = %f, held-out perplexity estimate = %f' % \
(1, olda._rhot, numpy.exp(-perwordbound))
# Save lambda, the parameters to the variational distributions
# over topics, and gamma, the parameters to the variational
# distributions over topic weights for the articles analyzed in
# the last iteration.
numpy.savetxt('lambda-%d.dat' % 1, olda._lambda)
numpy.savetxt('gamma-%d.dat' % 1, gamma)
topic_terms_array = []
for topic in range(len(olda._lambda)):
lambda_sum = sum(olda._lambda[topic])
for term in range(len(olda._lambda[topic])):
topic_terms_array.append((topic, term, olda._lambda[topic][term]/lambda_sum))
db.update_topic_terms(K, topic_terms_array)
gc.collect() # probably not necesary, but precautionary for long runs
db.print_task_update()
# The DB thread ends only when it has both run out of tasks and it has been
# signaled that it will not be recieving any more tasks
db.increment_batch_count()
db.signal_end()
def main():
"""
Downloads and analyzes a bunch of random Wikipedia articles using
online VB for LDA.
"""
# The number of documents to analyze each iteration
batchsize = 64
# The total number of documents in Wikipedia
D = 3.3e6
# The number of topics
K = 100
# How many documents to look at
if (len(sys.argv) < 2):
documentstoanalyze = int(D/batchsize)
else:
documentstoanalyze = int(sys.argv[1])
# Our vocabulary
vocab = file('./dictnostops.txt').readlines()
W = len(vocab)
# Add terms and topics to the DB
db.init()
db.add_terms(vocab)
db.add_topics(K)
# Initialize the algorithm with alpha=1/K, eta=1/K, tau_0=1024, kappa=0.7
olda = onlineldavb.OnlineLDA(vocab, K, D, 1./K, 1./K, 1024., 0.7)
# Run until we've seen D documents. (Feel free to interrupt *much*
# sooner than this.)
for iteration in range(0, documentstoanalyze):
# Download some articles
(docset, articlenames) = \
wikirandom.get_random_wikipedia_articles(batchsize)
# Give them to online LDA
(gamma, bound) = olda.update_lambda(docset)
# Compute an estimate of held-out perplexity
(wordids, wordcts) = onlineldavb.parse_doc_list(docset, olda._vocab)
# Arrays for adding batches of data to the DB
doc_array = []
doc_term_array = []
for d in range(len(articlenames)):
doc_array.append((articlenames[d], docset[d]))
# Add a batch of docs to the DB; this is the one DB task that is not in
# the separate DB write thread since later tasks depend on having doc ids.
# Since writes take so long, this also balaces the two threads time-wise.
doc_ids = db.add_docs(doc_array)
doc_topic_array = []
for d in range(len(gamma)):
doc_size = len(docset[d])
for k in range(len(gamma[d])):
doc_topic_array.append((doc_ids[d], k, gamma[d][k], gamma[d][k]/doc_size))
db.add_doc_topics(doc_topic_array)
perwordbound = bound * len(docset) / (D * sum(map(sum, wordcts)))
print '%d: rho_t = %f, held-out perplexity estimate = %f' % \
(iteration, olda._rhot, numpy.exp(-perwordbound))
# Save lambda, the parameters to the variational distributions
# over topics, and gamma, the parameters to the variational
# distributions over topic weights for the articles analyzed in
# the last iteration.
if (iteration % 10 == 0):
numpy.savetxt('lambda-%d.dat' % iteration, olda._lambda)
numpy.savetxt('gamma-%d.dat' % iteration, gamma)
topic_terms_array =[]
for topic in range(len(olda._lambda)):
lambda_sum = sum(olda._lambda[topic])
for term in range(len(olda._lambda[topic])):
topic_terms_array.append((topic, term, olda._lambda[topic][term]/lambda_sum))
db.update_topic_terms(K, topic_terms_array)
gc.collect() # probably not necesary, but precautionary for long runs
db.print_task_update()
db.increment_batch_count()
# The DB thread ends only when it has both run out of tasks and it has been
# signaled that it will not be recieving any more tasks
db.signal_end()
print "loading model settings"
f = open(join(args.fit_path, 'settings.pickle'))
vocab, K, docgen = cPickle.load(f)
f.close()
# load model itself, the olda object
print "loading model"
f = open(join(args.fit_path, 'olda.pickle'))
olda = cPickle.load(f)
f.close()
# Add terms and topics to the DB
print "initializing db"
db.init()
print "adding vocab terms"
db.add_terms(vocab)
print "adding",K,"topics"
db.add_topics(K)
# write out the final topics to the db
print "writing out final topics to tmv db"
for topic in range(len(olda._lambda)):
topic_terms_array = []
lambda_sum = sum(olda._lambda[topic])
for term in range(len(olda._lambda[topic])):
topic_terms_array.append((term, \
olda._lambda[topic][term]/lambda_sum))
db.update_topic_terms(topic, topic_terms_array)