def update(self, answer):
"""Updates skills of users and difficulties of places according
to given answer.
:param answer: Answer to a question.
:type answer: :class:`pandas.Series` or :class:`Answer`
"""
user = self.users[answer.user_id]
place = self.places[answer.place_id]
prediction = self.predict(answer)
level = tools.automaticity_level(answer.response_time)
prob = (prediction * self.zeta + level) / (self.zeta + 1)
shift = answer.is_correct - prob
user.inc_skill(self.uncertainty(user.answers_count) * shift)
place.inc_difficulty(-(self.uncertainty(place.answers_count) * shift))
self.predictions[answer.id] = prediction
def update(self, answer):
"""Performes update of current knowledge of a user based on the
given answer.
:param answer: Answer to a question.
:type answer: :class:`pandas.Series` or :class:`Answer`
"""
item = self.items[answer.user_id, answer.place_id]
if not item.practices:
self.prior.update(answer)
prediction = self.predict(answer)
self.predictions[answer.id] = prediction
item.add_practice(answer)
level = tools.automaticity_level(answer.response_time) / self.zeta
if answer.is_correct:
item.inc_knowledge(self.gamma * (1 - prediction) + level)
else:
item.inc_knowledge(self.delta * prediction + level)