def executeWriteMany( db, dbConn, sql, rows, writeCursor=None, warnQuery=False, charset=DEF_ENCODING, use_unicode=DEF_UNICODE_SWITCH, mysql_config_file=MYSQL_CONFIG_FILE):
"""Executes a write query"""
if warnQuery:
warn("SQL (write many) QUERY: %s"% sql)
if not writeCursor:
writeCursor = dbConn.cursor()
attempts = 0;
while (1):
try:
writeCursor.executemany(sql, rows)
break
except MySQLdb.Error as e:
attempts += 1
warn(" *MYSQL Corpus DB ERROR on %s:\n%s (%d attempt)"% (sql, e, attempts))
time.sleep(MYSQL_ERROR_SLEEP)
(dbConn, dbCursor, dictCursor) = dbConnect(db, charset=charset, use_unicode=use_unicode, mysql_config_file=mysql_config_file)
writeCursor = dbConn.cursor()
if (attempts > MAX_ATTEMPTS):
sys.exit(1)
return writeCursor
def executeGetList( db, dbCursor, sql, warnQuery=True, charset=DEF_ENCODING, use_unicode=DEF_UNICODE_SWITCH, mysql_config_file=MYSQL_CONFIG_FILE):
"""Executes a given query, returns results as a list of lists"""
warnQuery = False
if warnQuery:
warn("SQL QUERY: %s"% sql[:MAX_SQL_PRINT_CHARS])
data = []
attempts = 0;
while (1):
try:
dbCursor.execute(sql)
data = dbCursor.fetchall()
break
except MySQLdb.Error as e:
attempts += 1
warn(" *MYSQL Corpus DB ERROR on %s:\n%s (%d attempt)"% (sql, e, attempts))
time.sleep(MYSQL_ERROR_SLEEP)
(dbConn, dbCursor, dictCursor) = dbConnect(db, charset=charset, use_unicode=use_unicode, mysql_config_file=mysql_config_file)
if (attempts > MAX_ATTEMPTS):
sys.exit(1)
return data
def dbConnect(db, charset=DEF_ENCODING, use_unicode=DEF_UNICODE_SWITCH, mysql_config_file=MYSQL_CONFIG_FILE):
""" Connects to specified database. Returns tuple of (dbConn, dbCursor, dictCursor) """
dbConn = None
attempts = 0;
while (1):
try:
dbConn = MySQLdb.connect (
db = db,
charset = charset,
use_unicode = use_unicode,
read_default_file = mysql_config_file
)
break
except MySQLdb.Error as e:
attempts += 1
warn(" *MYSQL Connect ERROR on db:%s\n%s\n (%d attempt)"% (db, e, attempts))
time.sleep(MYSQL_ERROR_SLEEP)
if (attempts > MAX_ATTEMPTS):
sys.exit(1)
dbCursor = dbConn.cursor()
dictCursor = dbConn.cursor(MySQLdb.cursors.DictCursor)
return dbConn, dbCursor, dictCursor
def executeGetSSCursor(db, sql, warnMsg = True, charset=DEF_ENCODING, use_unicode=DEF_UNICODE_SWITCH, mysql_config_file=MYSQL_CONFIG_FILE):
"""Executes a given query (ss cursor is good to iterate over for large returns)"""
if warnMsg:
warn("SQL (SSCursor) QUERY: %s"% sql[:MAX_SQL_PRINT_CHARS])
#print("\n\nmysql config file from mm:", mysql_config_file)#debug
ssCursor = dbConnect(db,
charset=charset,
use_unicode=use_unicode,
mysql_config_file=mysql_config_file,
)[0].cursor(MySQLdb.cursors.SSCursor)
data = []
attempts = 0;
while (1):
try:
ssCursor.execute(sql)
break
except MySQLdb.Error as e:
attempts += 1
warn(" *MYSQL Corpus DB ERROR on %s:\n%s (%d attempt)"% (sql, e, attempts))
time.sleep(MYSQL_ERROR_SLEEP*attempts**2)
ssCursor = dbConnect(db, charset=charset, use_unicode=use_unicode, mysql_config_file=mysql_config_file)[0].cursor(MySQLdb.cursors.SSCursor)
if (attempts > MAX_ATTEMPTS):
sys.exit(1)
return ssCursor
import shutil
from subprocess import check_output
from dlatk.messageTransformer import MessageTransformer
sys.path.append(os.path.dirname(os.path.realpath(__file__)).replace("/dlatk/LexicaInterface",""))
from dlatk.featureExtractor import FeatureExtractor
from dlatk import dlaConstants as dlac
try:
from gensim import corpora
from gensim.models.wrappers import LdaMallet
except:
LdaMallet = object
dlac.warn("Warning: Cannot import gensim (cannot run LDA)")
pass
from numpy import log2, isnan
try:
from pymallet import defaults
from pymallet.lda import estimate_topics
except:
dlac.warn("Warning: Cannot import pymallet (cannot run LDA)")
pass
from json import loads
class TopicExtractor(FeatureExtractor):
def addLDAFeatTable(self,
ldaMessageTable,
tableName=None,
valueFunc=lambda d: d):
"""Creates feature tuples (correl_field, feature, values) table where features are ngrams"""
"""Optional ValueFunc program scales that features by the function given"""
#CREATE TABLE:
featureName = 'lda' + '_' + ldaMessageTable.split('$')[1]
featureTableName = self.createFeatureTable(featureName,
'SMALLINT UNSIGNED',
'INTEGER', tableName,
valueFunc)
#SELECT / LOOP ON CORREL FIELD FIRST:
usql = """SELECT %s FROM %s GROUP BY %s""" % (
self.correl_field, self.corptable, self.correl_field)
msgs = 0 #keeps track of the number of messages read
cfRows = self._executeGetList(
usql) #SSCursor woudl be better, but it loses connection
dlac.warn("finding messages for %d '%s's" %
(len(cfRows), self.correl_field))
self._disableTableKeys(
featureTableName
) #for faster, when enough space for repair by sorting
for cfRow in cfRows:
cf_id = cfRow[0]
mids = set() #currently seen message ids
freqs = dict() #holds frequency of n-grams
totalInsts = 0 #total number of (non-distinct) topics
#grab topics by messages for that cf:
for messageRow in self.getMessagesForCorrelField(
cf_id, messageTable=ldaMessageTable):
message_id = messageRow[0]
topicsEncoded = messageRow[1]
if not message_id in mids and topicsEncoded:
msgs += 1
if msgs % PROGRESS_AFTER_ROWS == 0: #progress update
dlac.warn("Messages Read: %dk" % int(msgs / 1000))
#print topicsEncoded
topics = json.loads(topicsEncoded)
for topic in topics:
totalInsts += 1
topicId = topic['topic_id']
if not topicId in freqs:
freqs[topicId] = 1
else:
freqs[topicId] += 1
mids.add(message_id)
#write topic to database (no need for "REPLACE" because we are creating the table)
wsql = """INSERT INTO """ + featureTableName + """ (group_id, feat, value, group_norm) values ('""" + str(
cf_id) + """', %s, %s, %s)"""
totalInsts = float(totalInsts) #to avoid casting each time below
rows = [
(k, v, valueFunc((v / totalInsts))) for k, v in freqs.items()
] #adds group_norm and applies freq filter
self._executeWriteMany(wsql, rows)
dlac.warn("Done Reading / Inserting.")
dlac.warn(
"Adding Keys (if goes to keycache, then decrease MAX_TO_DISABLE_KEYS or run myisamchk -n)."
)
self._enableTableKeys(featureTableName) #rebuilds keys
dlac.warn("Done\n")
return featureTableName
def randomSubsetTable( db, sourceTableName, destinationTableName, keyField, percentToSubset=.10, distinct=True, charset=DEF_ENCODING, use_unicode=DEF_UNICODE_SWITCH, mysql_config_file=MYSQL_CONFIG_FILE):
warn("making TABLE %s, a %2.2f percent random subset of TABLE %s on unique key %s..."%(destinationTableName, percentToSubset, sourceTableName, keyField))
warn("connecting to DATABASE %s..."%(db))
(dbConn, dbCursor, dictCursor) = dbConnect(db, charset=charset, use_unicode=use_unicode, mysql_config_file=mysql_config_file)
warn("removing destination table if it exists...")
sql = 'DROP TABLE IF EXISTS %s'%(destinationTableName)
execute(db, dbCursor, sql, True, charset=charset, use_unicode=use_unicode)
warn("cloning structure of table...")
sql = 'CREATE TABLE %s LIKE %s'%(destinationTableName, sourceTableName)
execute(db, dbCursor, sql, True, charset=charset, use_unicode=use_unicode)
isDistinctText = ' distinct' if distinct else ''
warn('grabbing a%s subset (%2.6f percent) of the keys on which to base the new table'%(isDistinctText, 100*percentToSubset))
sql = 'SELECT DISTINCT(%s) FROM %s'%(keyField, sourceTableName) if distinct else 'SELECT %s FROM %s'%(keyField, sourceTableName)
uniqueKeyList = executeGetList1(db, dbCursor, sql, True, charset=charset, use_unicode=use_unicode)
warn(str(uniqueKeyList[1:5]))
newKeys = sample(uniqueKeyList, int(floor(len(uniqueKeyList)*percentToSubset)))
newKeys = list(map(str, newKeys))
warn("populating newly created table, TABLE %s"%(destinationTableName))
populateQuery = "INSERT INTO %s SELECT * FROM %s WHERE %s IN (%s)"%(destinationTableName, sourceTableName, keyField, ','.join(newKeys))
execute(db, dbCursor, populateQuery, False, charset=charset, use_unicode=use_unicode)
warn("finished making TABLE %s, a %2.2f percent random subset of TABLE %s on unique key %s!"%(destinationTableName, percentToSubset, sourceTableName, keyField))
