def _with_age(score, time):
freshness = 1
if score > -1:
age = timedelta2seconds(datetime.utcnow() - time)
freshness = max(1, math.log10(max(1, max_age - age)))
str_time = "%020d" % datetime2seconds(time)
str_score_freshness = "%029.10f" % (freshness * score)
return str_score_freshness + str_time
def activity(query_filter, from_time=None, to_time=None):
if not to_time:
to_time = datetime.utcnow()
if not from_time:
from_time = to_time - timedelta(days=30)
base_age = timedelta2seconds(to_time - from_time)
query = model.meta.Session.query(model.Event.time)
query = query.filter(model.Event.time >= from_time)
query = query.filter(model.Event.time <= to_time)
query = query.order_by(model.Event.time.asc())
query = query_filter(query)
def evt_value(event_time):
age = base_age - timedelta2seconds(to_time - event_time)
return math.log(max(1, age))
act = sum([evt_value(row[0]) for row in query])
return act
def activity(query_filter, from_time=None, to_time=None):
if not to_time:
to_time = datetime.utcnow()
if not from_time:
from_time = to_time - timedelta(days=30)
base_age = timedelta2seconds(to_time - from_time)
query = model.meta.Session.query(model.Event.time)
query = query.filter(model.Event.time >= from_time)
query = query.filter(model.Event.time <= to_time)
query = query.order_by(model.Event.time.asc())
query = query_filter(query)
def evt_value(event_time):
age = base_age - timedelta2seconds(to_time - event_time)
return math.log(max(1, age))
act = sum([evt_value(row[0]) for row in query])
return act
def _with_age(score, time, impact=0):
if score > -1:
age = timedelta2seconds(datetime.utcnow() - time)
# freshness = 1 .. 5.2 if max_age == 2 days
freshness = math.log10(max(10, max_age - age))
else:
freshness = 1
# atan normalizes to -pi/2 .. +pi/2
base = math.atan(freshness * score)
# add impact
assert -10 <= impact <= 10
result = base + impact * math.pi
str_time = "%020d" % datetime2seconds(time)
str_score_freshness = "%029.10f" % (result)
return str_score_freshness + str_time
def evt_value(event_time):
age = base_age - timedelta2seconds(to_time - event_time)
return math.log(max(1, age))
def evt_value(event_time):
age = base_age - timedelta2seconds(to_time - event_time)
return math.log(max(1, age))
