Hello,
I can’t believe how long it took me to get an LSTM to work in PyTorch
and
Still I can’t believe I have not done my work in Pytorch though.
My final goal is make time-series prediction LSTM model

not just one step prediction but Multistep prediction model
So it should successfully predict Recursive Prediction

The dataset is Power Consumption dataset (http://www.cs.ucr.edu/~eamonn/discords/ 4)


So I can implement it to the Anomaly Detection (My final final final Goal)(https://www.elen.ucl.ac.be/Proceedings/esann/esannpdf/es2015-56.pdf 5)

I created my custom dataset referenced by Understanding LSTM input 5
and make LSTM model using scheduled sampling -  https://arxiv.org/abs/1506.03099 3
decay schedules is Linear method.
The problem is, rather than making multistep predictions, my process has been blocked from the training stage. I plotted the prediction value obtained from the training, the result was such a  mess just a MESS.

I referenced many git hub codes including official torch github (https://github.com/pytorch/examples/tree/master/time_sequence_prediction 15, https://github.com/chickenbestlover/RNN-Time-series-Anomaly-Detection 2)  to solve this problem and have seen a lot of topic related to LSTM, but I could not solve my problem. Even I sent an e-mail to the author of the git hub code, but he also said that he did not complete the multistep prediction for power demand dataset.
From http://kth.diva-portal.org/smash/record.jsf?pid=diva2%3A1149130&dswid=3859 3,
the Stateful LSTM method should be used because the dataset such as power demand has a long weekly cycle. So I tried various attempts to maintain the hidden state and cell state as 0 which means not to initialize it.
I’ve been on this for over a month and I’m so exhausted. I want to upload all the codes in my mind, but because it gets too long, I upload the code of the training part and the lstm model code first. In addition, if the other parts of code are needed, I can upload more. I need the help from anyone who know about lstm well.

def train_data(model, lookahead, hidden_, cell_, dataloader, epoch, batch_size, device):
model.train()
total_loss = 0
pred_list = []
realY_list = []

optimizer = optim.Adam(model.parameters(), lr=learning_rate)

for iteration, (X, y) in enumerate(dataloader):

    iter_pred = [] # get output from teacher forcing or free learning train
    optimizer.zero_grad()

    X = X.transpose(0, 1).float().to(device)
    y_true = y.float().to(device)

    model_out, hidden_, cell_ = model(X, hidden_, cell_)

    iter_pred.append(model_out)

    for i in range(lookahead-1):
        '''For scheduled sampling (Teacher Forcing or Free Learning)'''
        '''Select T or F'''
        population, weights = get_population_weight(args, epoch)
        teacher_or_free = choice(population, weights)
        # print("Teacher or Free =>", teacher_or_free)

        if teacher_or_free == "T":
            y_teacher = y_true[:, i].reshape(1, batch_size, 1)
            model_out, hidden_, cell_ = model(y_teacher, hidden_, cell_)
            iter_pred.append(model_out)

        elif teacher_or_free == "F":
            y_free = model_out.reshape(1, batch_size, 1)
            model_out, hidden_, cell_ = model(y_free, hidden_, cell_)
            iter_pred.append(model_out)

    y_pred = torch.cat(iter_pred, dim=0)
    y_true = y_true.view(-1)

    loss = loss_function(y_pred, y_true)
    loss.backward()
    optimizer.step()

    total_loss += loss

    pred_list.append(y_pred)
    realY_list.append(y_true)

print(epoch, "epoch")
print("loss =", total_loss)

return realY_list, pred_list, y_pred, hidden_, cell_

class LSTM(nn.Module):
def __init__(self, input_dim, hidden_dim, output_dim, batch_size, num_layers, dropout, use_bn, device):
    super(LSTM, self).__init__()
    self.input_dim = input_dim
    self.hidden_dim = hidden_dim
    self.output_dim = output_dim
    self.batch_size = batch_size
    self.num_layers = num_layers
    self.device = device

    self.dropout = dropout
    self.use_bn = use_bn

    # Define the LSTM layer
    self.lstm = nn.LSTM(self.input_dim, self.hidden_dim, self.num_layers)

    # Define the output layer
    self.regressor = self.make_regressor()

def make_regressor(self):
    layers = []
    if self.use_bn:
        layers.append(nn.BatchNorm1d(self.hidden_dim))
    layers.append(nn.Dropout(self.dropout))

    layers.append(nn.Linear(self.hidden_dim, self.hidden_dim // 2))
    layers.append(nn.ReLU())
    layers.append(nn.Linear(self.hidden_dim // 2, self.output_dim))
    regressor = nn.Sequential(*layers)
    return regressor

def forward(self, lstm_input, hidden, cell):
    hidden_ = hidden.detach()
    cell_ = cell.detach()

    y_pred, (hidden_out, cell_out) = self.lstm(lstm_input, (hidden_, cell_))
    lstm_out = y_pred
    y_pred = self.regressor(lstm_out[-1].view(self.batch_size, -1))

    return y_pred, hidden_out, cell_out


ANY help would be appreciated…Thanks…