3D Batch input for the mLSTM

[matiashaggman]

Hi! Thank you for your great contribution.

I am trying to see whether I can achieve a better result by using the mLSTM architecture for time series classification as opposed to a traditional LSTM.

This is part of my code:

 super().__init__()
        self.num_classes = num_classes
        self.inp_dim = num_features
        self.head_dim = 8
        self.head_num = 4
        self.hid_dim = self.head_num * self.head_dim
        
        self.batch_size = 5
        
        # Create an instance of mLSTM
        self.model = mLSTM(self.inp_dim, self.head_num, self.head_dim)

        self.hid_0 = self.model.init_hidden(self.batch_size)

        self.out = nn.Linear(in_features=self.hid_dim, out_features=self.num_classes)

    def forward(self, features:torch.Tensor) -> torch.Tensor:
        """
        Forward pass through the network.
        
        Args:
          x (Tensor): The input tensor containing features of shape (batch_size, rec_length, n_features).
          rec_lengths (Tensor): The actual lengths of each sleep sequence before padding.

        Returns:
          Tensor: The output logits of shape (batch_size, rec_length, n_classes).
        """
        # Pass the input through the GRU layer.   
        x, _ = self.model(features, self.hid_0)
        
        # Pass the output of the GRU through the output layer to get class logits for each time step.
        y = self.out(x)
        
        return y

However when I try to run the forward pass with for example the following tensor (general shape of my data):

x = torch.rand(seq_len, batch_size, num_features)
y = model(x)

I will get the following error:

--> [306]return F.conv1d(input, weight, bias, self.stride, self.padding, self.dilation, self.groups)

RuntimeError: Given groups=1, weight of size [1, 1, 4], expected input[1199, 5, 10] to have 1 channels, but got 5 channels instead

Is it possible to run the model with 3D input? Thanks in advance.