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main.py
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from fastapi import FastAPI, HTTPException
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import joblib
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import pandas as pd
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from typing import Dict
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app = FastAPI(
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title="Spending Risk ML Backend",
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description="Predicts future spend, spike risk, and spending acceleration",
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version="1.0.0"
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)
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# -----------------------------
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# Load models ONCE at startup
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# -----------------------------
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try:
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future_spend_model = joblib.load("future_spend_7d.pkl")
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spike_model = joblib.load("spike_probability.pkl")
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acceleration_model = joblib.load("acceleration.pkl")
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FEATURES = joblib.load("model_features.pkl")
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except Exception as e:
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raise RuntimeError(f"❌ Model loading failed: {e}")
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# -----------------------------
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# Health check (HF requirement)
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# -----------------------------
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@app.get("/")
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def health_check():
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return {
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"status": "running",
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"service": "spending-risk-backend"
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}
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# -----------------------------
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# Prediction endpoint
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# -----------------------------
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@app.post("/predict")
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def predict(payload: Dict):
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try:
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# 1. Build feature vector safely
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# Missing features -> default 0
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input_row = {feat: payload.get(feat, 0) for feat in FEATURES}
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X = pd.DataFrame([input_row])
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# 2. Predictions
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future_spend = float(future_spend_model.predict(X)[0])
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spike_prob = float(spike_model.predict_proba(X)[0][1])
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acceleration = float(acceleration_model.predict(X)[0])
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# 3. Response (frontend-friendly)
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return {
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"future_7d_spend": round(future_spend, 2),
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"spike_probability": round(spike_prob, 3),
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"acceleration": round(acceleration, 2)
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}
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except Exception as e:
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raise HTTPException(
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status_code=400,
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detail=f"Prediction failed: {str(e)}"
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)
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