recognition space meaning in English

识别空间

Taking the real - time recognition request into consideration , a bi - layer ahmm model ( bl - ahmm ) is introduced . bl - ahmm can reduce the recognition space by pre - categorization , which improves the speed and accuracy of recognition . like the other grads descend algorithms , the problem of local optima is also existed in the training of hmm
为了进一步提高识别速度，满足联机识别中实时性的要求，本文在ahmm的基础上同时提出了一种双层自适应识别模型（ bl - ahmm ），通过预分类来减小识别空间，提高了系统识别速度并同时提高了识别率。