I am going through failures that I see in Gonum tests when we build on
arm64 (Travis now provide this).
In many cases there are slight differences that I'm OK with adding a
tolerance to accept, but in one case (stat.ROC[0][1]) I see an error
that can be completely avoided by changing the expression from what is
at [1] to
```
for i := range tpr {
tpr[i] = 1 - tpr[i]/nPos
fpr[i] = 1 - fpr[i]/nNeg
}
```
Should I expect `inv := 1/c; v *= inv` and `v /= c` to give the same
results for reasonable cases? (or at least to match the behaviour on
amd64/386/arm - which all agree).
thanks
Dan
[0]https://godoc.org/gonum.org/v1/gonum/stat#ROC
[1]
https://github.com/gonum/gonum/blob/683ee363d56e77121c6640345bb9d40644f02a1f/stat/roc.go#L107-L114
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