how to train RNN ?

hi i have a timit dataset and i need to train a recurrent neural network

the lines below of a code read only two waves i need a method to read the whole dataset in the same idea

[train1, fs]=audioread('female_train.wav');
[train2, fs]=audioread('male_train.wav');


maxLength=max([length(train1), length(train2)]);
train1(end+1:maxLength)=eps;
train2(end+1:maxLength)=eps;

train1=train1./sqrt(sum(train1.^2));
train2=train2./sqrt(sum(train2.^2));