How to initialize the weights of LSTM

Those weight variables cannot be used according to the LSTM documentation. How can I initialize those weight variables?

You are trying to access an attribute of nn.LSTM:

model = nn.LSTM(1, 1)
> Parameter containing:
          [ 0.1228],
          [-0.9885]], requires_grad=True)

while your current object seems to be an object of the LstmRNN class, which is not a PyTorch module, but seems to be a custom class.
Depending on the class definition I assume that you might be using an nn.LSTM module internally, e.g. via lstm_model.lstm or any other name.