Updated cover image for dt article

content/post/a-tale-of-decision-trees-java-opencl.md

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 I worked on a decision tree program in java for my final year MSc project. In a series of posts such as this one, I'll be highlighting some of the aspects of it's creation and implementation.
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 That's it for now. In the next post I'll talk about the system overview and architecture. Stay tuned!
 
 ![System Architecture](/img/sysarch.png)
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+Cover image source: https://www.sciencemag.org/