jshbrmn/irt-service
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extract to the helper so we can easily toggle the knobs

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This commit is contained in:
Adrian Manteza 2022-03-03 22:01:32 +00:00
parent ef63ef4e02
commit bacc478b3e
3 changed files with 17 additions and 12 deletions
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6
app/helpers/solver_helper.py
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@ -82,3 +82,9 @@ def get_random_bundles(total_form_items: int,
return selected_bundles return selected_bundles
else: else:
return get_random_bundles(total_form_items, total_bundles - 1, bundles) return get_random_bundles(total_form_items, total_bundles - 1, bundles)
def elasticize_constraint(lp_constraint, parameters = {}):
penalty = parameters.get('penalty', 1) # could be a 100% penalty
proportionFreeBound = parameters.get('proportionFreeBound', 0.25)
return lp_constraint.makeElasticSubProblem(penalty=penalty, proportionFreeBound=proportionFreeBound)

2
app/lib/irt/test_response_function.py
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@ -8,7 +8,7 @@ class TestResponseFunction():
self.irt_model = irt_model self.irt_model = irt_model
self.irf = ItemResponseFunction(irt_model) self.irf = ItemResponseFunction(irt_model)
# determins the probably of an inidividual # determine the probability of an individual
# at a certain theta (ability level) would get a sum of questions correct # at a certain theta (ability level) would get a sum of questions correct
# detailed further on page 166, equation 3 here: # detailed further on page 166, equation 3 here:
# https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978482/pdf/10.1177_0146621615613308.pdf # https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978482/pdf/10.1177_0146621615613308.pdf

21
app/services/loft_service.py
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@ -85,8 +85,7 @@ class LoftService(Base):
problem_objective_functions = [] problem_objective_functions = []
# dummy objective function, because it just makes things easier™ # dummy objective function, because it just makes things easier™
problem += lpSum( problem += lpSum([items[item.id] for item in self.solver_run.items])
[items[item.id] for item in self.solver_run.items])
# constraints # constraints
# problem += lpSum([items[item.id] # problem += lpSum([items[item.id]
@ -128,10 +127,10 @@ class LoftService(Base):
sense=0, sense=0,
name=f'tif theta ({target.theta}) @{target.value}', name=f'tif theta ({target.theta}) @{target.value}',
rhs=target.value) rhs=target.value)
elastized_constraint = constraint.makeElasticSubProblem(
penalty=1, proportionFreeBound=0.25) elasticized_constraint = solver_helper.elasticize_constraint(constraint)
if int(target.value) == 20: print(elastized_constraint) problem.extend(elasticized_constraint)
problem.extend(elastized_constraint) # if int(target.value) == 20: print(elasticized_constraint)
for target in self.solver_run.objective_function.tcc_targets: for target in self.solver_run.objective_function.tcc_targets:
tcc = lpSum([ tcc = lpSum([
bundle.trf(self.solver_run.irt_model, target.theta) * bundle.trf(self.solver_run.irt_model, target.theta) *
@ -141,6 +140,7 @@ class LoftService(Base):
for item in self.solver_run.items for item in self.solver_run.items
]) ])
problem_objective_functions.append(tcc) problem_objective_functions.append(tcc)
e = LpAffineExpression( e = LpAffineExpression(
[(bundles[bundle.id], [(bundles[bundle.id],
bundle.trf(self.solver_run.irt_model, target.theta)) bundle.trf(self.solver_run.irt_model, target.theta))
@ -152,9 +152,9 @@ class LoftService(Base):
sense=0, sense=0,
name=f'tcc theta ({target.theta}) @{target.value}', name=f'tcc theta ({target.theta}) @{target.value}',
rhs=target.value) rhs=target.value)
elastized_constraint = constraint.makeElasticSubProblem(
penalty=1, proportionFreeBound=0.25) elasticized_constraint = solver_helper.elasticize_constraint(constraint)
problem.extend(elastized_constraint) problem.extend(elasticized_constraint)
# solve problem # solve problem
logging.info('Solving...') logging.info('Solving...')
@ -164,8 +164,7 @@ class LoftService(Base):
logging.info('Solved...generating form and adding to solution') logging.info('Solved...generating form and adding to solution')
# add return items and create as a form # add return items and create as a form
form_items = service_helper.solution_items(problem.variables(), form_items = service_helper.solution_items(problem.variables(), self.solver_run)
self.solver_run)
# add form to solution # add form to solution
solution.forms.append( solution.forms.append(