标准LSTM：
与标准LSTM相比，Kaldi的fastlstm对相同或类似的矩阵运算进行了合并。
# Component specific to 'projected' LSTM (LSTMP), contains both recurrent and non-recurrent projections
fastlstm.W_rp, fast lstm Weight recurrent projected
fastlstm.W_all, fast lstm Weight all
fastlstm.rp, fast lstm recurrent projected
同时包含了对循环与非循环的向量的投影
即将1024维输入投影为循环的向量维数（如256）与非循环的向量维数（如512）
fastlstm.c, fast lstm cell
fastlstm.m, fast lstm memory
fastlstm.r, fast lstm recurrent
fastlstm.cr_trunc, fast lstm cell recurrent truncate
用于向量的截断，截断为
fastlstm.c_trunc, fast lstm cell truncated
fastlstm.r_trunc, fast lstm recurrent truncated