RuntimeError with dot product

[liperrino]

when running the train.py file i got:
/media/vivien/A/NEW-SMT/Neural-Machine-Translation/data/deu.txt
Traceback (most recent call last):
File "train.py", line 124, in
loss = train(input_variable, target_variable, encoder, decoder, encoder_optimizer, decoder_optimizer, criterion)
File "train.py", line 53, in train
encoder_outputs)
File "/home/vivien/.local/lib/python3.6/site-packages/torch/nn/modules/module.py", line 489, in call
result = self.forward(*input, **kwargs)
File "/media/vivien/A/NEW-SMT/Neural-Machine-Translation/src/attention_decoder.py", line 55, in forward
attention_weights = self.attention(rnn_output.squeeze(0), encoder_outputs)
File "/home/vivien/.local/lib/python3.6/site-packages/torch/nn/modules/module.py", line 489, in call
result = self.forward(*input, **kwargs)
File "/media/vivien/A/NEW-SMT/Neural-Machine-Translation/src/attention.py", line 41, in forward
energies[i] = self._score(hidden, encoder_outputs[i])
File "/media/vivien/A/NEW-SMT/Neural-Machine-Translation/src/attention.py", line 51, in _score
energy = hidden.dot(energy)
RuntimeError: dot: Expected 1-D argument self, but got 2-D