What does 1024 by 3 model mean?

I was watching this video and Sentdex mentioned he had to switch around 1024 by 3 model. What does he mean by 1024 by 3 model and what did he change around?

• When does he say that? Don't make us watch a 17 minute video. – Emre May 8 '18 at 1:17
• Add the timestamp link directly or the captions at that frame – Aditya May 8 '18 at 1:21
• Sorry guys I was working. It's around at @3:30 – Jason Marsh May 8 '18 at 1:36
• Can you please remove the downvote? I've added the video timestamp – Jason Marsh May 8 '18 at 1:44

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