Some simple functions for log operations.

real logAdd(real log_a, real log_b)

logAdd(log_a,log_b) = log(a+b) = log(exp(log_a)+exp(log_b)) but done in a smart way so that if log_a or log_b are large but not their difference the computation works correctly

real logSub(real log_a, real log_b)

logSub(log_a,log_b) = log(a-b)

Documentation

Some simple functions for log operations.

Author:

Samy Bengio (bengio@idiap.ch)

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