Show all xval weightings again.
Print out best classifier score for each metric.
Only show best classifier for each metric.
Sample branches by share of event total.

Improves accuracy by >10% for *all* metrics. Most odd.
Histogram of mispredictions-by-branches.
Increase training sample by 100x.
Remove irrelevant measures of success.
Make prediction based on cycle cost.

We assume
1. all jumps are brcc or brbit instructions
2. no delay slots are used.

On EnCore, other jump instructions carry a 1 cycle cost regardless of
prediction, which makes the whole exercise rather pointless.