def get_pc_vec(self):
pc_vec = []
conds = truthtable(len(self.parents) + len(self.children))
for cond in conds:
cond_p_prob = self.p_vec[bool_list_to_int(
cond[:len(self.parents)])] if any(self.p_vec) else 1.
cond_c_prob = self.c_vec[bool_list_to_int(
cond[len(self.parents):])] if any(self.c_vec) else 1.
print(self.p_vec, self.c_vec)
print(cond, cond_p_prob, cond_c_prob)
pc_vec.append(cond_p_prob * cond_c_prob)
return pc_vec
def declare_c_probability(self, probability, cond):
"""
Function of link value declaration
Inputs :
- probability : float that enphasizes the probability that the student knows self Skill knowing cond
- cond : dict with the form {'skill_id of a parent': True or False, ...}
"""
assert cond.keys() == [
kc.id for kc in self.linked_knowledge_components
], "Error: some parents are lacking"
index = bool_list_to_int(
[cond[kc.id] for kc in self.linked_knowledge_components])
self.probability_vector[index] = probability
def set_children_conditioned_probability_vector(self,
vec=None,
step_by_step=False):
"""
Set the conditional probability vector of KnowledgeComponent given the mastering of its children.
:param vec: the conditional probability vector knowing the states of children given by converting the index of
the probability vector in binary (e.g. for B, C children of A, vec is 4 length : 1st index corresponds to
B is False, C is False ; 3rd index is B True, C False)
:param step_by_step: if the form of linked_knowledge_component is unknown, it is possible to set conditional
probabilities value by value.
:return: None, only changes the value of self.probability_vector
"""
if not step_by_step:
assert len(vec) == 2**len(self.linked_knowledge_components), "Length of the probability vector " \
"should be 2^n."
self.probability_vector = vec
else:
combinations = truthtable(len(self.linked_knowledge_components))
for comb in combinations:
self.probability_vector[bool_list_to_int(comb)] = input(
f"Probability {self.knowledge_component.name} knowing "
f"{[child.name for child in self.linked_knowledge_components]} value {comb} is :"
)