On Pretraining for Project-Level Code Completion
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How AI Learns to Finish Your Code Faster

Ever wondered how a computer can guess the next line of code you’re about to write? Scientists discovered that teaching an AI model on whole code repositories—like giving it a whole library instead of single books—makes it much better at completing code in real time. By expanding the AI’s “memory window” from a short paragraph to the length of a short story (16,000 words), the team trained a modest‑sized model on just 1 billion tokens and still matched the performance of giants that chew through hundreds of billions. The biggest boost came from a simple tweak to how the AI understands position, similar to giving it a better sense of where each word sits on a page. Even the most straightforward “file‑by‑file” training worked wonders, pr…

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