Github user sachingoel0101 commented on the pull request:
https://github.com/apache/flink/pull/757#issuecomment-117047575
Hi @thvasilo, thanks for taking the time to go through it.
Consider for example a probability distribution P(X_0) = 0.2, P(X_1) = 0.3,
P(X_2) = 0.5
To sample an element out of X_0, X_1 and X_2, we can generate a random
number but we need to map intervals of real numbers to the values X_0, X_1 and
X_2. This is what the discreteSampler does.
It forms a cumulative distribution as [0.2, 0.5, 1.0] and then, if the
generated random no is in [0, 0.2), we pick X_0, and so on.
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