working TCC (Test response funciton)

app/helpers/service_helper.py

@@ -40,7 +40,7 @@ def solution_to_file(buffer, total_form_items, forms):
   # add each form as row to processed csv
   for form in forms:
     # provide generated items and cut score
-    row = form.items + [form.cut_score]
+    row = [item.id for item in form.items] + [form.cut_score]
     wr.writerow(row)
 
   buff2 = io.BytesIO(buffer.getvalue().encode())

app/lib/irt/item_response_function.py

@@ -1,4 +1,4 @@
-from models.three_parameter_logitistc import ThreeParameterLogistic
+from lib.irt.models.three_parameter_logistic import ThreeParameterLogistic
 
 class ItemResponseFunction():
   def __init__(self, irt_model):
@@ -6,7 +6,7 @@ class ItemResponseFunction():
 
   def calculate(self, **kwargs):
     if self.model_data.model == '3PL':
-      return ThreeParameterLogistic.new(self.model_data, kwargs).result
+      return ThreeParameterLogistic(self.model_data, kwargs).result()
     else:
       # potentially error out
       return None

app/lib/irt/models/three_parameter_logistic.py

@@ -7,7 +7,6 @@ class ThreeParameterLogistic:
     self.theta = kwargs['theta']
 
   def result(self):
-    a = self.model_params.a
+    a = self.model_params.a_param
-    c = self.model_params.c
+    c = self.model_params.c_param
-
+    return c + (1 - c) * (1 / (1 + self.e**(-a * (self.theta - self.b_param))))
-    return c + (1 - c) * (1 / (1 + e**(-a * (self.theta - self.b_param))))

app/lib/irt/test_response_function.py

@@ -1,12 +1,17 @@
+from lib.irt.item_response_function import ItemResponseFunction
+
 # otherwise known as the Test Characteristic Curve (TCC)
 class TestResponseFunction():
-  def __init__(self, irf):
+  def __init__(self, irt_model):
-    self.irf = irf
+    self.irt_model = irt_model
+    self.irf = ItemResponseFunction(irt_model)
 
   def calculate(self, items, **kwargs):
-    result = 0
+    sum = 0
 
     for item in items:
-      result += irf.calculate(b_param=item.b_param, theta=kwargs['theta'])
+      result = self.irf.calculate(b_param=item.b_param, theta=kwargs['theta'])
+      item.irf = result
+      sum += item.irf
 
-    return result
+    return sum

app/models/form.py

@@ -4,5 +4,5 @@ from typing import List
 from models.item import Item
 
 class Form(BaseModel):
-  items: List[int]
+  items: List[Item]
   cut_score: float

app/models/item.py

@@ -7,3 +7,4 @@ class Item(BaseModel):
   id: int
   attributes: List[Attribute]
   b_param: int
+  irf: float = 0.00

app/services/loft_service.py

@@ -45,12 +45,7 @@ class LoftService(Base):
     # real solver will return N forms and process a cut score, this is for mock purposes
     return Solution(
       response_id=random.randint(100,5000),
-      forms=[
+      forms=[self.generate_forms(random.sample(self.solver_run.items, self.solver_run.total_form_items)) for x in range(form_count)]
-        Form(
-          items=[item.id for item in random.sample(self.solver_run.items, self.solver_run.total_form_items)],
-          cut_score=120
-        ) for x in range(form_count)
-      ]
     )
 
   def stream_to_s3_bucket(self):
@@ -60,3 +55,9 @@ class LoftService(Base):
 
     # upload generated file to s3 and return result
     return aws_helper.file_stream_upload(solution_file, f'{service_helper.key_to_uuid(self.key)}.csv', os.environ['MEASURE_PROCESSED_BUCKET'])
+
+  def generate_forms(self, items):
+    return Form(
+      items=items,
+      cut_score=TestResponseFunction(self.solver_run.irt_model).calculate(items, theta=self.solver_run.theta_cut_score)
+    )