Distributed XGBoost with Dask for Scalable Machine Learning

This example showcases the use of Dask for distributed computing with XGBoost, enabling efficient training on large datasets. We cover:

• Training an XGBoost model on a Dask cluster.
• Saving the trained model to disk.
• Loading the saved model and making predictions on new data.

import practicuscore as prt

# Let's start with creating an interactive Dask cluster 
# Note: you can also run this as a batch job.
# To learn more, please view the batch section of this guide.

if prt.distributed.running_on_a_cluster():
    print("You are already running this code on a distributed cluster. No need to create a new one..")
else:
    print("Starting a new distributed Dask cluster.")
    distributed_config = prt.distributed.JobConfig(
        job_type = prt.distributed.JobType.dask,
        worker_count = 2,
    )
    worker_config = prt.WorkerConfig(
        worker_size="X-Small",
        distributed_config=distributed_config,
    )
    coordinator_worker = prt.create_worker(
        worker_config=worker_config,
    )

    # Let's login to the cluster coordinator
    notebook_url = coordinator_worker.open_notebook()

    print("Page did not open? You can open this url manually:", notebook_url)

Execute on Dask Cluster

• If you just created a new cluster, please open the new browser tab to login to the Distributed Dask coordinator, and continue with the below steps..
• If you are already on the cluster, you can continue with the below steps..

(Optional) Viewing training details on the Dask dashboard

If you would like to view training details, please login the Dask dashboard with the below.

import practicuscore as prt

dashboard_url = prt.distributed.open_dashboard()

print("Page did not open? You can open this url manually:", dashboard_url)

import practicuscore as prt 

# Let's get a Dask session
client = prt.distributed.get_client()

Training with XGBoost on Dask Cluster

import xgboost as xgb
import dask.array as da
from dask_ml.model_selection import train_test_split
import numpy as np
import dask.distributed

# Generate some random data (replace with your actual data)
X = da.random.random((1000, 10), chunks=(100, 10))
y = da.random.randint(0, 2, size=1000, chunks=100)

# Split the data
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2)

# Convert Dask arrays to DaskDMatrix (XGBoost-compatible format)
dtrain = xgb.dask.DaskDMatrix(client, X_train, y_train)
dtest = xgb.dask.DaskDMatrix(client, X_test, y_test)

# Set XGBoost parameters
params = {
    'objective': 'binary:logistic',
    'max_depth': 6,
    'eta': 0.3,
    'tree_method': 'hist'
}

# Train the model
bst = xgb.dask.train(client, params, dtrain, num_boost_round=100)
print("Model trained successfully")

# Optionally, evaluate the model on test data
preds = xgb.dask.predict(client, bst, dtest)
print("Predictions made successfully")

model_path = "model.ubj"
bst['booster'].save_model(model_path)
print(f"Model saved to {model_path}")

Deploying model as an API

Note: If you would like to deploy the XGBoost model as an API, please visit the modeling basics section.

Load and train with the XGBoost model

print("Loading Model and Predicting")

# Load the saved model
loaded_bst = xgb.Booster()
loaded_bst.load_model(model_path)
print("Model loaded successfully")

# Generate a *new* random dataset (important: different from training/testing)
X_new = da.random.random((500, 10), chunks=(100, 10))  # New data!
X_new_computed = client.compute(X_new).result() # Important to compute before creating DMatrix
dnew = xgb.DMatrix(X_new_computed)

# Make predictions using the loaded model
new_preds = loaded_bst.predict(dnew)
print("New predictions made successfully")

# Print some predictions (convert to NumPy array for easier printing)
print("First 10 New Predictions:")
print(new_preds[:10])

# Cleanup
try:
    # if code is running where you started the cluster
    coordinator_worker.terminate()
except:
    # Or else, let's terminate self, which will also terminate the cluster.
    prt.get_local_worker().terminate()

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