keras: Input 0 is incompatible with layer lstm_1: expected ndim=3, found ndim=2

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The same code as below runs well on keras-0.3.3 but failed on keras-1.0.2.
What should I change if I want to run the code below on keras-1.0.2?

Code

en_de_model = Sequential()
en_de_model.add(Embedding(input_dim=vocab_size,
                          output_dim=hidden_dim,
                          input_length=input_maxlen))
en_de_model.add(LSTM(hidden_dim))

Error

File "/Users/kanoukoei/Desktop/encoder_decoder-master/encoder_decoder.py", line 167, in main en_de_model.add(encoder_top_layer)
File "/Users/kanoukoei/anaconda/lib/python3.5/site-packages/keras/models.py", line 142, in add output_tensor = layer(self.outputs[0])
File "/Users/kanoukoei/anaconda/lib/python3.5/site-packages/keras/engine/topology.py", line 441, in call self.assert_input_compatibility(x)
File "/Users/kanoukoei/anaconda/lib/python3.5/site-packages/keras/engine/topology.py", line 382, in assert_input_compatibility str(K.ndim(x)))
Exception: Input 0 is incompatible with layer lstm_1: expected ndim=3, found ndim=2

keras
0 Answers
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