def create_plays_by_user_filtered(plays_by_user,
most_popular_songs,
target_collection,
disable_filtering=False):
plays_batch = []
most_popular_song_ids = map(lambda s: int(s['_id']), most_popular_songs)
for user_play_map in plays_by_user.find():
entry = {'_id': user_play_map['_id'], 'value': {}}
for song_id, play_count in user_play_map['value'].iteritems():
song_index = int(song_id)
if song_index in most_popular_song_ids:
entry['value'][song_id] = play_count
if disable_filtering or len(entry['value'].keys()) > 1:
plays_batch.append(entry)
if len(plays_batch) > 0 and len(plays_batch) % BATCH_SIZE == 0:
insert_batch(plays_batch, target_collection)
plays_batch = []
if len(plays_batch) > 0:
insert_batch(plays_batch, target_collection)
def create_plays_by_most_often_played_song(db, source_collection_name, target_collection_name):
buckets = {}
i = 1
for plays_by_user in db[source_collection_name].find():
if i == 1 or i % 100 == 0:
print "Looking for bucket for %d. user" % i
user_id = plays_by_user['_id']
plays = plays_by_user['value']
most_often_played_song = plays[0]
if most_often_played_song in buckets:
bucket = buckets[most_often_played_song]
else:
bucket = []
buckets[most_often_played_song] = bucket
bucket.append({'_id': user_id, 'value': plays})
i += 1
print "Number of buckets: %d" % len(buckets)
target_collection = db[target_collection_name]
batch = [{'_id': bucket_id, 'value': value} for bucket_id, value in buckets.iteritems()]
print "Buckets batch ready"
start = 0
end = BATCH_SIZE
while start < len(batch):
insert_batch(batch[start:end], target_collection)
start += BATCH_SIZE
end += BATCH_SIZE
def import_triplets_from_file(filename, db_collection):
with open(filename) as file:
triplets_batch = []
for line in file:
triplet = get_triplet_from_fileline(line)
triplets_batch.append(triplet)
if len(triplets_batch) % BATCH_SIZE == 0:
insert_batch(triplets_batch, db_collection)
triplets_batch = []
if len(triplets_batch) > 0:
insert_batch(triplets_batch, db_collection)
def create_plays_by_user_binary(plays_by_user, most_popular_songs, target_collection):
plays_batch = []
for user_play_map in plays_by_user.find():
entry = {'_id': user_play_map['_id'], 'value': {}}
for song in most_popular_songs:
song_index = str(int(song['_id']))
entry['value'][song_index] = song_index in user_play_map['value']
plays_batch.append(entry)
if len(plays_batch) % BATCH_SIZE == 0:
insert_batch(plays_batch, target_collection)
plays_batch = []
if len(plays_batch) > 0:
insert_batch(plays_batch, target_collection)
def create_plays_by_user_binary(plays_by_user, most_popular_songs,
target_collection):
plays_batch = []
for user_play_map in plays_by_user.find():
entry = {'_id': user_play_map['_id'], 'value': {}}
for song in most_popular_songs:
song_index = str(int(song['_id']))
entry['value'][song_index] = song_index in user_play_map['value']
plays_batch.append(entry)
if len(plays_batch) % BATCH_SIZE == 0:
insert_batch(plays_batch, target_collection)
plays_batch = []
if len(plays_batch) > 0:
insert_batch(plays_batch, target_collection)
def create_plays_by_user_filtered_simple(plays_by_user, target_collection):
plays_batch = []
for plays_by_user in plays_by_user.find():
entry = {
'_id': plays_by_user['_id'],
'value': [song_id for song_id in plays_by_user['value']]
}
# sort by plays count
entry['value'].sort(key=lambda x: plays_by_user['value'][x], reverse=True)
if len(entry['value']) > 1:
plays_batch.append(entry)
if len(plays_batch) > 0 and len(plays_batch) % BATCH_SIZE == 0:
insert_batch(plays_batch, target_collection)
plays_batch = []
if len(plays_batch) > 0:
insert_batch(plays_batch, target_collection)
def create_plays_by_user_filtered_simple(plays_by_user, target_collection):
plays_batch = []
for plays_by_user in plays_by_user.find():
entry = {
'_id': plays_by_user['_id'],
'value': [song_id for song_id in plays_by_user['value']]
}
# sort by plays count
entry['value'].sort(key=lambda x: plays_by_user['value'][x],
reverse=True)
if len(entry['value']) > 1:
plays_batch.append(entry)
if len(plays_batch) > 0 and len(plays_batch) % BATCH_SIZE == 0:
insert_batch(plays_batch, target_collection)
plays_batch = []
if len(plays_batch) > 0:
insert_batch(plays_batch, target_collection)
def create_plays_by_most_often_played_song(db, source_collection_name,
target_collection_name):
buckets = {}
i = 1
for plays_by_user in db[source_collection_name].find():
if i == 1 or i % 100 == 0:
print "Looking for bucket for %d. user" % i
user_id = plays_by_user['_id']
plays = plays_by_user['value']
most_often_played_song = plays[0]
if most_often_played_song in buckets:
bucket = buckets[most_often_played_song]
else:
bucket = []
buckets[most_often_played_song] = bucket
bucket.append({'_id': user_id, 'value': plays})
i += 1
print "Number of buckets: %d" % len(buckets)
target_collection = db[target_collection_name]
batch = [{
'_id': bucket_id,
'value': value
} for bucket_id, value in buckets.iteritems()]
print "Buckets batch ready"
start = 0
end = BATCH_SIZE
while start < len(batch):
insert_batch(batch[start:end], target_collection)
start += BATCH_SIZE
end += BATCH_SIZE
