Correct way to do transfer learning (Keras AssertionError)

[salexo]

Hi, I'm trying to do transfer learning from the provided English net to a custom data set. The readme mentions that even languages with a different number of characters compared to English can be used by supplying the allowed_characters_for_loaded_model parameter, however I'm getting an AssertionError upon execution:

Traceback (most recent call last):
  File "test.py", line 4, in <module>
    english = Configuration.english().load_model(load_name=Configuration.english_baseline[0], load_epoch=Configuration.english_baseline[1], allowed_characters_for_loaded_model=new_corpus.frequent_characters)
  File "/usr/local/lib/python3.5/dist-packages/speechless/configuration.py", line 184, in load_model
    reinitialize_trainable_loaded_layers=reinitialize_trainable_loaded_layers)
  File "/usr/local/lib/python3.5/dist-packages/speechless/net.py", line 182, in __init__
    loaded_first_layers_count=frozen_layer_count if reinitialize_trainable_loaded_layers else None)
  File "/usr/local/lib/python3.5/dist-packages/speechless/net.py", line 231, in load_weights
    asg_transition_probabilities=self.asg_transition_probabilities)
  File "/usr/local/lib/python3.5/dist-packages/speechless/net.py", line 182, in __init__
    loaded_first_layers_count=frozen_layer_count if reinitialize_trainable_loaded_layers else None)
  File "/usr/local/lib/python3.5/dist-packages/speechless/net.py", line 212, in load_weights
    self.predictive_net.load_weights(str(load_model_from_directory / self.model_file_name(load_epoch)))
  File "/usr/local/lib/python3.5/dist-packages/keras/engine/network.py", line 1161, in load_weights
    f, self.layers, reshape=reshape)
  File "/usr/local/lib/python3.5/dist-packages/keras/engine/saving.py", line 915, in load_weights_from_hdf5_group
    reshape=reshape)
  File "/usr/local/lib/python3.5/dist-packages/keras/engine/saving.py", line 571, in preprocess_weights_for_loading
    assert shape[0] == layer.filters and shape[2:] == (layer.kernel_size[0], 1)
AssertionError

I'm starting the training by this script:

english = Configuration.english().load_model(load_name=Configuration.english_baseline[0], 
               load_epoch=Configuration.english_baseline[1], 
               allowed_characters_for_loaded_model=new_corpus.frequent_characters)
new = Configuration.new()
new.train(english, run_name="transfer_test_01")

Training from scratch has no problems. What am I doing wrong?