def log_prob_to_linear(log_prob)
      logmath = ps_api.ps_get_logmath(ps_decoder)
      ps_api.logmath_exp(logmath, log_prob)
    end
def log_prob_to_linear(log_prob)
      logmath = ps_api.ps_get_logmath(ps_decoder)
      ps_api.logmath_exp(logmath, log_prob)
    end
Convert logarithmic probability to linear floating point