Hello,
Was hoping someone could shed some light on the added complexity of
subtracting maxv and then adding it back in at the end:
@cython.boundscheck(False)
def _logsum(int N, np.ndarray[dtype_t, ndim=1] X):
cdef int i
cdef double maxv, Xsum
Xsum = 0.0
maxv = X.max()
for i in xrange(N):
Xsum += exp(X[i] - maxv)
return log(Xsum) + maxv
Im pretty sure its to mitigate underflow or overflow errors, but seems like
those could still be issues.
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