In essence, this article is about:

1) Training a sample model and uploading it to an S3 bucket:

```python from sklearn.datasets import load_iris from sklearn.model_selection import train_test_split from sklearn.linear_model import LogisticRegression import joblib

Load the Iris dataset

iris = load_iris() X, y = iris.data, iris.target

Split the data into training and testing sets

X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)

Train the logistic regression model

model = LogisticRegression(max_iter=200) model.fit(X_train, y_train)

Save the trained model to a file

joblib.dump(model, 'model.pkl') ```

1. Creating a sample Zappa config, because AWS Lambda doesn’t natively support Flask, we need to use Zappa, a tool that helps deploy WSGI applications (like Flask) to AWS Lambda:

```json { "dev": { "app_function": "app.app", "exclude": [ "boto3", "dateutil", "botocore", "s3transfer", "concurrent" ], "profile_name": null, "project_name": "flask-test-app", "runtime": "python3.10", "s3_bucket": "zappa-31096o41b" },

"production": {
    "app_function": "app.app",
    "exclude": [
        "boto3",
        "dateutil",
        "botocore",
        "s3transfer",
        "concurrent"
    ],
    "profile_name": null,
    "project_name": "flask-test-app",
    "runtime": "python3.10",
    "s3_bucket": "zappa-31096o41b"
}

} ```

1. Writing a sample Flask app:

```python import boto3 import joblib import os

Initialize the Flask app

app = Flask(name)

S3 client to download the model

s3 = boto3.client('s3')

Download the model from S3 when the app starts

s3.download_file('your-s3-bucket-name', 'model.pkl', '/tmp/model.pkl') model = joblib.load('/tmp/model.pkl')

@app.route('/predict', methods=['POST']) def predict(): # Get the data from the POST request data = request.get_json(force=True)

# Convert the data into a numpy array
input_data = np.array(data['input']).reshape(1, -1)

# Make a prediction using the model
prediction = model.predict(input_data)

# Return the prediction as a JSON response
return jsonify({'prediction': int(prediction[0])})

if name == 'main': app.run(debug=True) ```

1. Deploying this app to production (to AWS):

bash zappa deploy production

and later eventually updating it:

bash zappa update production

1. We should get a URL like this:

https://xyz123.execute-api.us-east-1.amazonaws.com/production

which we can query:

curl -X POST -H "Content-Type: application/json" -d '{"input": [5.1, 3.5, 1.4, 0.2]}' https://xyz123.execute-api.us-east-1.amazonaws.com/production/predict

can be helpful when auth

Develop a Lightweight Project With the Help of AWS, Lambda and Serverless

Extremely happy to see such an amazing opportunity which I think will help create fined grain API's which are fast and can leverage Caching strategies which will be cheap.