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dream's Issues

RuntimeError: 'lengths' argument should be a 1D CPU int64 tensor, but got 1D cuda:0 Long tensor

I follow the example and execute

python3 main.py dream -b environment=\"miniworld_sign\" -c configs/default.json -c configs/miniworld.json

but I failed, it seems to be a device error.

Traceback (most recent call last):
  File "/home/tianyun/research/rl-samples/dream/main.py", line 385, in <module>
    main()
  File "/home/tianyun/research/rl-samples/dream/main.py", line 250, in main
    episode, _ = run_episode(
  File "/home/tianyun/research/rl-samples/dream/main.py", line 55, in run_episode
    action, next_hidden_state = policy.act(
  File "/home/tianyun/research/rl-samples/dream/dqn.py", line 91, in act
    return self._dqn.act(state, prev_hidden_state=prev_hidden_state, test=test)
  File "/home/tianyun/research/rl-samples/dream/dqn.py", line 418, in act
    q_values, hidden_state = self._Q([[state]], prev_hidden_state)
  File "/home/tianyun/anaconda3/envs/rl/lib/python3.9/site-packages/torch/nn/modules/module.py", line 889, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/tianyun/research/rl-samples/dream/dqn.py", line 467, in forward
    state_embedding, hidden_state = self._state_embedder(states, hidden_states)
  File "/home/tianyun/anaconda3/envs/rl/lib/python3.9/site-packages/torch/nn/modules/module.py", line 889, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/tianyun/research/rl-samples/dream/embed.py", line 303, in forward
    trajectory_embed, _ = self._trajectory_embedder(
  File "/home/tianyun/anaconda3/envs/rl/lib/python3.9/site-packages/torch/nn/modules/module.py", line 889, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/tianyun/research/rl-samples/dream/embed.py", line 240, in forward
    self._compute_contexts(trajectories))
  File "/home/tianyun/research/rl-samples/dream/embed.py", line 160, in _compute_contexts
    padded_transitions = nn.utils.rnn.pack_padded_sequence(
  File "/home/tianyun/anaconda3/envs/rl/lib/python3.9/site-packages/torch/nn/utils/rnn.py", line 245, in pack_padded_sequence
    _VF._pack_padded_sequence(input, lengths, batch_first)
RuntimeError: 'lengths' argument should be a 1D CPU int64 tensor, but got 1D cuda:0 Long tensor

I try to only use CPU in main.py, but still fail, the error message is

Traceback (most recent call last):
  File "/home/tianyun/research/rl-samples/dream/main.py", line 385, in <module>
    main()
  File "/home/tianyun/research/rl-samples/dream/main.py", line 250, in main
    episode, _ = run_episode(
  File "/home/tianyun/research/rl-samples/dream/main.py", line 55, in run_episode
    action, next_hidden_state = policy.act(
  File "/home/tianyun/research/rl-samples/dream/dqn.py", line 91, in act
    return self._dqn.act(state, prev_hidden_state=prev_hidden_state, test=test)
  File "/home/tianyun/research/rl-samples/dream/dqn.py", line 418, in act
    q_values, hidden_state = self._Q([[state]], prev_hidden_state)
  File "/home/tianyun/anaconda3/envs/rl/lib/python3.9/site-packages/torch/nn/modules/module.py", line 889, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/tianyun/research/rl-samples/dream/dqn.py", line 467, in forward
    state_embedding, hidden_state = self._state_embedder(states, hidden_states)
  File "/home/tianyun/anaconda3/envs/rl/lib/python3.9/site-packages/torch/nn/modules/module.py", line 889, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/tianyun/research/rl-samples/dream/embed.py", line 303, in forward
    trajectory_embed, _ = self._trajectory_embedder(
  File "/home/tianyun/anaconda3/envs/rl/lib/python3.9/site-packages/torch/nn/modules/module.py", line 889, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/tianyun/research/rl-samples/dream/embed.py", line 240, in forward
    self._compute_contexts(trajectories))
  File "/home/tianyun/research/rl-samples/dream/embed.py", line 174, in _compute_contexts
    transition_hidden_states = torch.cat(
RuntimeError: All input tensors must be on the same device. Received cuda:0 and cpu

then I only use CPU in embed.py, and I success to train it.
Is that a device bug?

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