Rasa interactive cannot write non-ascii character due to the encoing

[matthewkos]

Rasa version: 1.10, 2.*

Rasa SDK version (if used & relevant):

Rasa X version (if used & relevant):

Python version: 3.7.6

Operating system (windows, osx, ...): Windows

Issue:
The rasa interactive write file write with the default encoding, for windows python, it may cause error if the user type utf-8 character.

Error (including full traceback):

Traceback (most recent call last):
  File "e:\env\anaconda\envs\rasa\lib\site-packages\rasa\core\training\interactive.py", line 1465, in record_messages
    plot_file,
  File "e:\env\anaconda\envs\rasa\lib\site-packages\rasa\core\training\interactive.py", line 949, in _predict_till_next_listen
    unconfirmed=[ActionExecuted(action_name)],
  File "e:\env\anaconda\envs\rasa\lib\site-packages\rasa\core\training\interactive.py", line 1394, in _plot_trackers
    write_dot(graph, output_file)
  File "<decorator-gen-781>", line 2, in write_dot
  File "e:\env\anaconda\envs\rasa\lib\site-packages\networkx\utils\decorators.py", line 240, in _open_file
    result = func_to_be_decorated(*new_args, **kwargs)
  File "e:\env\anaconda\envs\rasa\lib\site-packages\networkx\drawing\nx_pydot.py", line 47, in write_dot
    path.write(P.to_string())
UnicodeEncodeError: 'cp950' codec can't encode character '\u5605' in position 505: illegal multibyte sequence

Command or request that led to error:

Content of configuration file (config.yml) (if relevant):

Content of domain file (domain.yml) (if relevant):

Solution:
change rasa/core/training/interactive.py : 1394

   write_dot(graph, output_file)

to

    output_file = open(output_file, 'w', encoding='utf-8')
    write_dot(graph, output_file)
    output_file.close()

[sara-tagger]

Thanks for raising this issue, @rgstephens will get back to you about it soon✨

Please also check out the docs and the forum in case your issue was raised there too 🤗