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Wave Workshop - Big Data Visualizer

路 3 min read
Michelle Tanco
PM of the AI AppStore @

H2O Wave allows for easily building front ends to your projects. I was recently inspired by this tutorial notebook which explains how to use open source H2O-3 for finding anomalies in a dataset. Part of this process is using the H2O-3 aggregator function to visualize relationships in large datasets. A data scientist is at home in a Jupyter Notebook, but we could make it easier for ourselves and analysts or other business users to run this code and benefit from the H2O-3 aggregator function by building a front-end using H2O Wave.

Below you can see our data aggregation and visualization app. Currently, the app itself is creating a 1M row dataset as a demo. We can see that the H2O-3 aggregation function reduces this down into 68 exemplar rows and tells us how many of the original rows fall into each exemplar.

Aggregated data as a table.

Aggregated data as a plot.


You can find the full source code for this app on GitHub.

Interested in seeing what it takes to make this type of application? In a 1 hour live-coding session we were able to:

  • Create the layout of our application
  • Create two interactive tabs for navigating in the app
  • Create a table view for a dataset
  • Create a plot view for a dataset

Here's the replay:

Ideas for Improvement#

For this app to be fully useful to our business users, we would probably want to add the following features:

  • Easily add data: allow users to aggregate and visualize on their own datasets
    • File upload from local machine
    • Connect to common SQL warehouses
    • Connect to common cloud data stores like s3
  • Improved backend performance
    • Connect to a production H2O-3 cluster rather than creating a cluster on the local machine of the H2O Wave server
  • Added user control
    • Let the end user decide parameters of the aggregator function like how many exemplar rows to attempt to make
  • Improved and new visualizations
    • Add new visualizations based on different data types
  • Robustness
    • Add unit tests!

If you do decide to work on this project, or use this as a template for your own projects, be sure to tag us on Twitter @h2o_wave or post as a Show and Tell on our GitHub discussions!

New in Wave 0.16: Custom Javascript

路 4 min read
Prithvi Prabhu
Chief of Technology @

Wave ships with a growing library of cards and components for assembling user interfaces. For most apps, the built-in components can be adequate. They're designed to work well with each other, with consistent typography, layout and theming; and the library of components keeps expanding with each new release.

However, no matter how comprehensive the Wave library gets over time, there will be situations where an app needs to use external Javascript components to supplement Wave's capabilities, like custom visualizations, UI enhancements, and graphics.

Wave 0.16+ allows importing and using third-party Javascript libraries on a page. This provides an escape-hatch of sorts, allowing you to add UI capabilities that are not yet possible with stock Wave.

Introducing Wave ML - AutoML for Wave Apps

路 6 min read
Peter Szab贸
Lead Software Engineer @

Today, we're excited to announce H2O Wave ML, an open-source extension to Wave that makes it easy to use automatic machine learning in your Wave apps.

$ pip install h2o-wave[ml]

In this article, we look at what Wave ML can do for you, how to get started, and what predictive applications look like in practice.

Routing, Themes and Analytics

路 3 min read
Prithvi Prabhu
Chief of Technology @

Wave v0.12 shipped last week, with support for handling queries and routes using decorators and experimental support for switching themes. Here's a rundown of the major features.