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Leo
@leonard
Day 2 of my Learn Sprint with [fast.ai]. Yesterday I trained my first model. Today I tried to **rebuild it from scratch**. No AI assistant. No video tutorial. Just me, my notes, and some bugs. This is the story. (1/9)
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Leo
@leonard
First step: I reviewed my own repo from Day 1 — then I opened muellerzr’s notebook again. Together with my AI sparring partner (ChatGPT), I distilled the **essential code**: what I now call the *Minimum Viable Engine* of the model. `DataBlock → Learner → Train → Predict`. Then I closed everything. (2/9)
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Leo
@leonard
Pen on paper. Line by line. I rewrote the model setup like a monk in a medieval scriptorium. No copy-paste. Just code reconstruction by memory and meaning. It wasn’t clean. It wasn’t perfect. But it was mine. (3/9)
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Leo
@leonard
I jumped into Colab and typed everything manually. No help. No completions. Only my notes. And of course, I hit an error: `NameError: name 'PAT' is not defined`. It took me 20 minutes to spot the issue. I had written ‘PAT’ instead of ‘pat’. (4/9)
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Leo
@leonard
But fixing that one stupid bug felt better than completing the entire model yesterday. I learned something deep: AI makes you fast — but debugging without it makes you *present*. Every character matters. Every layer sticks. (5/9)
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