Fix of get_model incorrect string splitting
Fix of get_model incorrect string splitting

Previous line 59 would split argument "complex_shallow_convnet" on underscores giving "complex", "shallow", "convnet", then selected the second giving "shallow" and would try to match this with "shallow_convnet" which could never be true.
This fix simply strips the leading "complex_" allowing correct comparison.
ChihebTrabelsi/deep_complex_networks,ChihebTrabelsi/deep_complex_networks