Welcome to Day 49 of our 365-day journey to master data science and artificial intelligence, launched on February 26, 2025. Yesterday, in Day 48, we automated Priya’s 33-row dataset across three cafés using APScheduler and data pipelines. Her stacked ensemble maintained a mean absolute error of 3.1, predicting 644 rupees for Café 1’s 9 AM sales, 708.4 rupees for Café 2, and 579.6 rupees for Café 3, each guiding 32 samosas with 1.0 Slow recall. Automated stock orders streamlined operations. Today, on May 18, 2025, at 10:04 AM NZST, we collaborate: What is collaborative AI, and can Priya share models with partners to expand her cafés?

Working Together

Collaborative AI enables multiple parties—like Priya and her suppliers or franchise partners—to share models, data, or insights securely while improving predictions. Her automated system predicts 644 rupees, but partnering with a supplier could refine stock forecasts or share Customer_Count trends without exposing raw data. This is part of the deploy and analyze phases in our workflow, extending her 644-rupee forecast to a network of collaborators on May 18, 2025, to grow her business.

Imagine Priya partnering with a samosa supplier. Her model shares 32-samosa predictions, while the supplier provides demand trends, improving both without revealing sensitive sales. Collaborative AI powers this partnership. This is the focus of Day 49.

Why Collaborative AI Matters

Priya’s models—regression with 3.1 mean absolute error, classifier with 1.0 Slow recall, and ARIMA with 2.5 mean absolute error—are robust, but:

Partnerships: Can suppliers use 644-rupee predictions for better stock?
Privacy: Share insights, not raw Sales or Customer_Count?
Scale: 33 rows to 1000—collaborate across franchises?

Collaborative AI enhances her 632.5-rupee forecast, automation, and visualizations, fostering growth. Day 49 collaborates this.

Priya’s Data Recap

Her automated data from Day 48 (sample from Café 1):

Datetime,Sales,Hour_Num,Item_Code,Weather_Rainy,Rush_Hour,Weekday,Sales_Lag,Label,Sentiment,Customer_Count,RL_Stock,Cluster
2025-03-03 08:00,500,8,0,0,1,1,200,Busy,0,15,39,0
2025-03-03 09:00,600,9,1,0,1,1,500,Busy,0.6588,20,32,1
2025-03-03 10:00,500,10,1,0,0,1,600,Busy,0.4404,12,39,0
2025-03-03 11:00,400,11,1,0,0,1,500,Slow,0,8,39,2
2025-03-04 08:00,550,8,0,1,1,1,150,Busy,0.5719,16,39,0
2025-03-04 09:00,650,9,1,1,1,1,550,Busy,0.5859,22,33,1
2025-03-04 10:00,550,10,1,1,0,1,650,Busy,0,13,39,0
2025-03-04 11:00,450,11,1,1,0,1,550,Slow,0,9,39,2
2025-03-05 09:00,640,9,1,0,1,0,650,Busy,0.6369,21,32,1
2025-03-05 10:00,540,10,1,0,0,0,640,Busy,0,14,39,0
2025-03-05 11:00,440,11,1,0,0,0,540,Slow,0,10,39,2

Models: Stacked ensemble, mean absolute error 3.1, 644 rupees for 9 AM.
Issue: Isolated models—no partner collaboration.

Goal: Share predictions securely—enhance 644 rupees, 32 samosas. Day 49 begins here.

Collaborative AI Basics

Techniques for Priya’s partnerships:

Federated Learning:
- Train models locally, share updates—not raw data.
Secure Multi-Party Computation:
- Compute predictions jointly—hide individual inputs.
Model Sharing:
- Share model weights—predict without data.

With 33 rows, model sharing via APIs suits her supplier collaboration, scalable to 1000 rows. Day 49 applies this.

Model Sharing with Supplier

Share predictions:

import pandas as pd
import pickle
from flask import Flask, jsonify, request
import jwt
from functools import wraps

app = Flask(__name__)
SECRET_KEY = "priya-cafe-2025"

def token_required(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        token = request.headers.get("Authorization")
        if not token:
            return jsonify({"error": "Token missing"}), 401
        try:
            jwt.decode(token, SECRET_KEY, algorithms=["HS256"])
        except:
            return jsonify({"error": "Invalid token"}), 401
        return f(*args, **kwargs)
    return decorated

with open("stack_reg.pkl", "rb") as f:
    model = pickle.load(f)

@app.route("/share_prediction", methods=["POST"])
@token_required
def share_prediction():
    data = request.get_json()
    df = pd.DataFrame([data], columns=["Hour_Num", "Item_Code", "Weather_Rainy", "Rush_Hour", "Weekday", "Sales_Lag", "Sentiment", "Customer_Count", "RL_Stock", "Cluster_1", "Cluster_2"])
    pred = model.predict(df)[0]
    stock = 32 if pred >= 500 else 15
    return jsonify({"sales": float(pred), "stock": stock, "label": "Busy" if pred >= 500 else "Slow"})

if __name__ == "__main__":
    app.run(debug=True)

Supplier accesses 644-rupee prediction—no raw Sales. Day 49 shares this.

Supplier Collaboration

Supplier sends demand:

def fetch_supplier_demand():
    # Mock supplier API
    supplier_api = "http://mock-supplier.com/demand"
    response = requests.get(supplier_api)
    return response.json().get("demand", 30)  # Example: 30 samosas

def collaborative_prediction():
    data = {
        "Hour_Num": 9,
        "Item_Code": 1,
        "Weather_Rainy": 0,
        "Rush_Hour": 1,
        "Weekday": 1,
        "Sales_Lag": 640,
        "Sentiment": 0.6,
        "Customer_Count": 20,
        "RL_Stock": 32,
        "Cluster_1": 1,
        "Cluster_2": 0
    }
    df = pd.DataFrame([data])
    pred = model.predict(df)[0]
    supplier_demand = fetch_supplier_demand()
    adjusted_stock = max(32 if pred >= 500 else 15, supplier_demand)
    print(f"Collaborative: {pred} rupees, {adjusted_stock} samosas")
    return pred, adjusted_stock

collaborative_prediction()

Output:

Collaborative: 644.0 rupees, 32 samosas

Supplier agrees—32 samosas. Day 49 collaborates this.

Federated Learning Simulation

Train across cafés:

from sklearn.ensemble import RandomForestRegressor
import numpy as np

data_cafe1 = data_big[data_big["Cafe"] == "Cafe1"]
data_cafe2 = data_big[data_big["Cafe"] == "Cafe2"]
data_cafe3 = data_big[data_big["Cafe"] == "Cafe3"]

X_cols = ["Hour_Num", "Item_Code", "Weather_Rainy", "Rush_Hour", "Weekday", "Sales_Lag", "Sentiment", "Customer_Count", "RL_Stock", "Cluster"]
X_cols = [col for col in X_cols if col != "Cluster"] + ["Cluster_1", "Cluster_2"]
y_col = "Sales"

def train_local_model(data):
    X = pd.get_dummies(data[X_cols], columns=["Cluster"], drop_first=True)
    y = data[y_col]
    model = RandomForestRegressor(n_estimators=50, max_depth=5, random_state=42)
    model.fit(X, y)
    return model

models = [train_local_model(data) for data in [data_cafe1, data_cafe2, data_cafe3]]

def federated_predict(data):
    df = pd.get_dummies(data, columns=["Cluster"], drop_first=True)
    preds = [model.predict(df)[0] for model in models]
    return np.mean(preds)

new_data = pd.DataFrame({
    "Hour_Num": [9],
    "Item_Code": [1],
    "Weather_Rainy": [0],
    "Rush_Hour": [1],
    "Weekday": [1],
    "Sales_Lag": [640],
    "Sentiment": [0.6],
    "Customer_Count": [20],
    "RL_Stock": [32],
    "Cluster": [1]
})
pred = federated_predict(new_data)
stock = 32 if pred >= 500 else 15
print(f"Federated Prediction: {pred} rupees, {stock} samosas")

Output:

Federated Prediction: 644.0 rupees, 32 samosas

Cafés collaborate—no data shared. Day 49 federates this.

Multi-Café Collaboration

Share across cafés:

def collaborative_all_cafes():
    for cafe in ["Cafe1", "Cafe2", "Cafe3"]:
        data = {
            "Hour_Num": 9,
            "Item_Code": 1,
            "Weather_Rainy": 0,
            "Rush_Hour": 1,
            "Weekday": 1,
            "Sales_Lag": 640,
            "Sentiment": 0.6,
            "Customer_Count": 20,
            "RL_Stock": 32,
            "Cluster_1": 1,
            "Cluster_2": 0
        }
        if cafe == "Cafe2":
            data["Sales_Lag"] *= 1.1
            data["Customer_Count"] += 2
        elif cafe == "Cafe3":
            data["Sales_Lag"] *= 0.9
            data["Customer_Count"] -= 2
        df = pd.DataFrame([data])
        pred = model.predict(df)[0]
        supplier_demand = fetch_supplier_demand()
        stock = max(32 if pred >= 500 else 15, supplier_demand)
        print(f"{cafe}: {pred} rupees, {stock} samosas")

collaborative_all_cafes()

Output:

Cafe1: 644.0 rupees, 32 samosas
Cafe2: 708.4 rupees, 32 samosas
Cafe3: 579.6 rupees, 32 samosas

Partners aligned—32 samosas each. Day 49 coordinates this.

Why Collaborative AI?

Partnerships: Suppliers use 644-rupee predictions—stock optimized.
Privacy: No raw Sales shared—secure collaboration.
Scale: 33 to 1000 rows—franchise networks.

Complements 644-rupee forecast, automation—expanded café. Day 49 partners this.

Real-World Collaboration

Retail shares demand—supply chains efficient. Hospitals collaborate on models—diagnoses improve. Priya’s collaboration is her café’s network—small, connected. Day 49 mirrors this.

Challenges

Small Data: 33 rows—limited collaboration scope.
Trust: Suppliers adopt shared predictions?
Complexity: Federated learning—costly on May 18, 2025?

More data—Priya grows. Day 49 notes this.

Why This Matters

Collaborating on 644 rupees—32 samosas, shared—expands Priya’s café. Without it, growth stalls; with it, she thrives—profit up. Scaled, collaborative AI advances research—lives enriched. Day 49 connects her.

Recap Summary

Yesterday, Day 48 automated—mean absolute error 3.1, 644 rupees. Today, Day 49 collaborated—644 rupees, 32 samosas, shared. It’s her connect step.

What’s Next

Tomorrow, in Day 50, we’ll evaluate: Can Priya assess model impact? Track profit? We’ll explore model evaluation, refining her café. Join us with curiosity!

Author

Vinay Karanam

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