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Markov: _retrieve_random_v_for_k1_and_k2_with_pref 

get one random v for a k1,k2 via SQL. prefer a word to show up in the
results, though there's no guarantee it will. this simplifies the
general looking forward case, and could possibly even work ok on the new
sentence stuff, though i haven't tried to update that portion of the
code yet
This commit is contained in:
Brian S. Stephan 2013-02-08 02:07:57 -06:00
parent db221a3c06
commit e7bed15ee8
1 changed files with 47 additions and 13 deletions
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60
modules/Markov.py
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@ -413,20 +413,21 @@ class Markov(Module):
hit_word = seed_word
else:
# work forwards
key_hits = self._retrieve_chains_for_key(gen_words[-2], gen_words[-1], context_id)
# use the chain that includes the target word, if it is found
if seed_word is not None and seed_word in key_hits:
hit_word = seed_word
self.log.debug("added seed word '{0:s}' to gen_words".format(hit_word))
self.log.debug("looking forwards")
prefer = seed_word if seed_word else ''
self.log.debug("preferring: '{0:s}'".format(prefer))
forw_v = self._retrieve_random_v_for_k1_and_k2_with_pref(gen_words[-2],
gen_words[-1],
prefer, context_id)
if forw_v:
gen_words.append(forw_v)
self.log.debug("added random word '{0:s}' to gen_words".format(forw_v))
self.log.debug("gen_words: {0:s}".format(" ".join(gen_words)))
else:
hit_word = self._get_suitable_word_from_choices(key_hits, gen_words, min_size)
self.log.debug("added random word '{0:s}' to gen_words".format(hit_word))
# from either method, append result
gen_words.append(hit_word)
self.log.debug("gen_words: {0:s}".format(" ".join(gen_words)))
# append stop, let below code clean it up if necessary
gen_words.append(self.stop)
self.log.debug("nothing found, adding stop")
self.log.debug("gen_words: {0:s}".format(" ".join(gen_words)))
# tack a new chain onto the list and resume if we're too short
if gen_words[-1] == self.stop and len(gen_words) < min_size + 3:
@ -536,6 +537,39 @@ class Markov(Module):
raise
finally: cur.close()
def _retrieve_random_v_for_k1_and_k2_with_pref(self, k1, k2, prefer, context_id):
"""Get one v for a given k1,k2.
Prefer that the result be prefer, if it's found.
"""
values = []
db = self.get_db()
try:
query = '''
SELECT v FROM markov_chain AS r1
JOIN (
SELECT (RAND() * (SELECT MAX(id) FROM markov_chain)) AS id
) AS r2
WHERE r1.id >= r2.id
AND r1.k1 = %s
AND r1.k2 = %s
AND r1.context_id = %s
ORDER BY r1.v = %s DESC, r1.id ASC
LIMIT 1
'''
cur = db.cursor(mdb.cursors.DictCursor)
cur.execute(query, (k1, k2, context_id, prefer))
result = cur.fetchone()
if result:
return result['v']
except mdb.Error as e:
self.log.error("database error in _retrieve_random_v_for_k1_and_k2_with_pref")
self.log.exception(e)
raise
finally: cur.close()
def _retrieve_random_k2_for_value(self, v, context_id):
"""Get one k2 for a given value."""