def forward(self, input):
        """ Invoked during the forward propagation of the RNN_Encoder module.
        Args:
            input (Tensor): input of shape (sentence length x batch_size)

        Returns:
            raw_outputs (tuple(list (Tensor), list(Tensor)): list of tensors evaluated from each RNN layer without using
            dropouth, list of tensors evaluated from each RNN layer using dropouth,
        """
        sl,bs = input.size()
        if bs!=self.bs:
            self.bs=bs
            self.reset()
        with set_grad_enabled(self.training):
            emb = self.encoder_with_dropout(input, dropout=self.dropoute if self.training else 0)
            emb = self.dropouti(emb)
            raw_output = emb
            new_hidden,raw_outputs,outputs = [],[],[]
            for l, (rnn,drop) in enumerate(zip(self.rnns, self.dropouths)):
                current_input = raw_output
                with warnings.catch_warnings():
                    warnings.simplefilter("ignore")
                    raw_output, new_h = rnn(raw_output, self.hidden[l])
                new_hidden.append(new_h)
                raw_outputs.append(raw_output)
                if l != self.n_layers - 1: raw_output = drop(raw_output)
                outputs.append(raw_output)

            self.hidden = repackage_var(new_hidden)
        return raw_outputs, outputs
Invoked during the forward propagation of the RNN_Encoder module.
        Args:
            input (Tensor): input of shape (sentence length x batch_size)

        Returns:
            raw_outputs (tuple(list (Tensor), list(Tensor)): list of tensors evaluated from each RNN layer without using
            dropouth, list of tensors evaluated from each RNN layer using dropouth,