title: AttributeError: 'tuple' object has no attribute 'dim', when feeding input to Pytorch LSTM network
body: <p>I am trying to run the following code:</p>
  
  <pre><code>import matplotlib.pylab as plt
  import numpy as np
  import torch
  import torch.nn as nn
  
  class LSTM(nn.Module):
      def __init__(self, input_shape, n_actions):
          super(LSTM, self).__init__()
  
          self.lstm = nn.LSTM(input_shape, 12)
          self.hidden2tag = nn.Linear(12, n_actions)
  
      def forward(self, x):
          out = self.lstm(x)
          out = self.hidden2tag(out)
          return out
  
  
  state = [(1,2,3,4,5),(2,3,4,5,6),(3,4,5,6,7),(4,5,6,7,8),(5,6,7,8,9),(6,7,8,9,0)]
  
  device = torch.device("cuda")
  net = LSTM(5, 3).to(device)
  
  state_v = torch.FloatTensor(state).to(device)
  
  q_vals_v = net(state_v.view(1, state_v.shape[0], state_v.shape[1]))
  _, action = int(torch.max(q_vals_v, dim=1).item())
  </code></pre>
  
  <p>And that returns this error:</p>
  
  <pre class="lang-none prettyprint-override"><code>Traceback (most recent call last):
    File "/home/dikkerj/Documents/PycharmProjects/LSTMReactor/QuestionStackoverflow.py", line 26, in &lt;module&gt;
      q_vals_v = net(state_v.view(1, state_v.shape[0], state_v.shape[1]))
    File "/home/dikkerj/.local/lib/python3.5/site-packages/torch/nn/modules/module.py", line 477, in __call__
      result = self.forward(*input, **kwargs)
    File "/home/dikkerj/Documents/PycharmProjects/LSTMReactor/QuestionStackoverflow.py", line 15, in forward
      out = self.hidden2tag(out)
    File "/home/dikkerj/.local/lib/python3.5/site-packages/torch/nn/modules/module.py", line 477, in __call__
      result = self.forward(*input, **kwargs)
    File "/home/dikkerj/.local/lib/python3.5/site-packages/torch/nn/modules/linear.py", line 55, in forward
      return F.linear(input, self.weight, self.bias)
    File "/home/dikkerj/.local/lib/python3.5/site-packages/torch/nn/functional.py", line 1022, in linear
      if input.dim() == 2 and bias is not None:
  AttributeError: 'tuple' object has no attribute 'dim'
  </code></pre>
  
  <p>Anyone knows how to fix this? (to get rid of the tensor being a tuple so that it can be fed into the LSTM network)</p>