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Mission: baseline model showdown — step 7 of 7

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Checkpoint

One last thing before we move on. pass this to mark the lesson done, or skip and keep moving.

Run the showdown's trained rung end to end. Fit: sweep thresholds 0-7 and pick the one maximizing accuracy on TRAIN (max with a key). Score: majority (always 0) and the learned threshold rule, both on the same test set. Print the two board lines, then the gap line for the learned rung: f"learned rung: train={...:.0%} test={...:.0%} gap={...:+.0%}".

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