min_cutoff minus std::max(0.0, ext_scorer_->beta) for what?

[zh794390558]

STT/native_client/ctcdecode/ctc_beam_search_decoder.cpp

Lines 85 to 86 in 116029a

	min_cutoff = prefixes_[num_prefixes - 1]->score +
	std::log(prob[blank_id_]) - std::max(0.0, ext_scorer_->beta);

Does this mean min_cutoff is lower than score + log(blank prob), so can consider beam score >= score + log(blank prob) which include blank in current step?