create graph for TensorFlow only works with numpy==1.19

[drbonis]

This error appears when you try to create a new Graph (with create_graph.py for example) an is due to numpy >= 1.20 not supported by TensorFlow 1.15

To solve the problem just force your numpy version to 1.19 for example with:

pip install numpy==1.19

error:

notImplementedError: Cannot convert a symbolic Tensor (char_repr_lstm/sequential/bidirectional/forward_lstm_1/strided_slice:0) to a numpy array.