Daniel Voigt Godoy - Deep Learning with PyTorch Step-by-Step A Beginner’s Guide-leanpub

The odds ratio is given by the ratio between the probability of success (p) and the
probability of failure (q):
Equation 3.5 - Odds ratio
In code, our odds_ratio() function looks like this:
def odds_ratio(prob):
return prob / (1 - prob)
p = .75
q = 1 - p
odds_ratio(p), odds_ratio(q)
Output
(3.0, 0.3333333333333333)
We can also plot the resulting odds ratios for probabilities ranging from 1% to
99%. The red dots correspond to the probabilities of 25% (q), 50%, and 75% (p).
Figure 3.2 - Odds ratio
Clearly, the odds ratios (left plot) are not symmetrical. But, in a log scale (right
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