Apple aapl is really pushing into this machine learning thing. A month after it came out that the company had bought Turi, it is now reported to have bought another company in the space, called Tuplejump.

Tuplejump was (its website has vanished) an Indian-U.S. company with technology for managing large amounts of data, or “big data” as the jargon has it.

TechCrunch, which reported the acquisition, said Apple was likely interested in an open-source Tuplejump project called FiloDB, which uses machine learning techniques to analyze fast-streaming data.

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Machine learning involves teaching computers how to learn from the data they are presented, so they can make predictions based on those learnings.

For Apple, it’s important for making the firm’s Siri virtual assistant smarter and better at voice recognition. Machine learning could also improve how the App Store recommends apps.

Other companies such as Google goog use such technology for everything from detecting spam to image recognition to developing self-driving cars. Ultimately, machine learning is a building block of so-called artificial intelligence.

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Last year, Apple bought a company in the field called Perceptio, with a view to improving its phone AI.