Add predict insurance fee api

app/api/router/predict.py

@@ -1,7 +1,13 @@
 # -*- coding: utf-8 -*-
-from fastapi import APIRouter
+import os
+import pickle
+import numpy as np
+from fastapi.param_functions import Depends
+from app.api.schemas import RegModelPrediction
+from fastapi import APIRouter, HTTPException
+from sqlalchemy.orm import Session
 
-from app import models
+from app import crud, models
 from app.database import engine
 from app.database import SessionLocal
 
@@ -27,3 +33,47 @@ def get_db():
 @router.get("/")
 def hello_world():
     return {"message": "Hello predict"}
+
+
+@router.put("/insurance")
+def predict_insurance(info: RegModelPrediction, db: Session = Depends(get_db)):
+    """
+    Get information and predict insurance fee
+    param:
+        info:
+            # 임시로 int형태를 받도록 제작
+            # preprocess 단계를 거치도록 만들 예정
+            age: int
+            sex: int
+            bmi: float
+            children: int
+            smoker: int
+            region: int
+    return:
+        insurance_fee: float
+    """
+    reg_model = crud.get_reg_model(db, model_name=info.model_name)
+
+    if reg_model:
+        loaded_model = pickle.load(open(
+            os.path.join(reg_model.path, f'{reg_model.model_name}.pkl'),
+            'rb')
+        )
+        test_set = np.array([
+            info.age,
+            info.sex,
+            info.bmi,
+            info.children,
+            info.smoker,
+            info.region
+        ]).reshape(1, -1)
+
+        pred = loaded_model.predict(test_set)
+
+        return {"result": pred.tolist()[0]}
+    else:
+        raise HTTPException(
+            status_code=404,
+            detail="Model Not Found",
+            headers={"X-Error": "Model Not Found"},
+        )

app/api/schemas.py

@@ -43,3 +43,21 @@ class ClfModelCreate(ClfModelBase):
 class ClfModel(ClfModelBase):
     class Config:
         orm_mode = True
+
+
+class RegModelBase(BaseModel):
+    model_name: str
+
+
+class RegModelPrediction(RegModelBase):
+    age: int
+    sex: int
+    bmi: float
+    children: int
+    smoker: int
+    region: int
+
+
+class RegModel(RegModelBase):
+    class Config:
+        orm_mode = True

app/crud.py

@@ -31,3 +31,9 @@ def create_clf_model(db: Session, clf_model: schemas.ClfModelCreate):
     db.commit()
     db.refresh(db_cf_model)
     return db_cf_model
+
+
+def get_reg_model(db: Session, model_name: schemas.RegModelBase):
+    return db.query(models.RegModel).filter(
+        models.RegModel.model_name == model_name
+    ).first()

app/models.py

@@ -42,7 +42,7 @@ class RegModel(Base):
     path = Column(String, nullable=False)
 
     model_metadata = relationship(
-        "reg_model_metadata", backref="reg_model.model_name")
+        "RegModelMetadata", backref="reg_model.model_name")
 
 
 class RegModelMetadata(Base):