message: Switched to Eigen exp/log
diff: @@ -263,9 +263,9 @@ void CTCBeamSearchDecoder<CTCBeamState, CTCBeamComparer>::Step(
  // Get normalization term of softmax: log(sum(exp(logit[j]-max_coeff))).
  float logsumexp = 0.0;
  for (int j = 0; j < raw_input.size(); ++j) {
  - logsumexp += expf(raw_input(j) - max_coeff);
  + logsumexp += Eigen::numext::exp(raw_input(j) - max_coeff);
  }
  - logsumexp = logf(logsumexp);
  + logsumexp = Eigen::numext::log(logsumexp);
  // Final normalization offset to get correct log probabilities.
  float norm_offset = max_coeff + logsumexp;
  