Problem with Keras - Cannot cast array

Rasa Open Source
1

Hi,

I’m trying to compare some policies, but I got some problems when using Keras as policy.

In particular, when I run this command:

rasa train core -c config-keras.yml config-emb.yml -s data/stories_training.md --out comparison_models/keras_emb

I get this error:

Traceback (most recent call last):
  File "_mt19937.pyx", line 178, in numpy.random._mt19937.MT19937._legacy_seeding
TypeError: 'str' object cannot be interpreted as an integer

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/bin/rasa", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.6/dist-packages/rasa/__main__.py", line 76, in main
    cmdline_arguments.func(cmdline_arguments)
  File "/usr/local/lib/python3.6/dist-packages/rasa/cli/train.py", line 118, in train_core
    do_compare_training(args, story_file, additional_arguments)
  File "uvloop/loop.pyx", line 1456, in uvloop.loop.Loop.run_until_complete
  File "/usr/local/lib/python3.6/dist-packages/rasa/core/train.py", line 160, in do_compare_training
    get_no_of_stories(args.stories, args.domain),
  File "/usr/local/lib/python3.6/dist-packages/rasa/core/train.py", line 120, in train_comparison_models
    model.model_fingerprint(file_importer),
  File "/usr/local/lib/python3.6/dist-packages/rasa/core/train.py", line 67, in train
    agent.train(training_data, **additional_arguments)
  File "/usr/local/lib/python3.6/dist-packages/rasa/core/agent.py", line 722, in train
    self.policy_ensemble.train(training_trackers, self.domain, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/rasa/core/policies/ensemble.py", line 126, in train
    policy.train(training_trackers, domain, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/rasa/core/policies/keras_policy.py", line 167, in train
    np.random.seed(self.random_seed)
  File "mtrand.pyx", line 244, in numpy.random.mtrand.RandomState.seed
  File "_mt19937.pyx", line 166, in numpy.random._mt19937.MT19937._legacy_seeding
  File "_mt19937.pyx", line 186, in numpy.random._mt19937.MT19937._legacy_seeding
TypeError: Cannot cast array from dtype('<U4') to dtype('int64') according to the rule 'safe'

Does anybody know how to solve this?

Thank you, Tiziano

2

How does your config-keras.yml file look like? Seems like you are trying to pass an invalid random seed according to the error.

3

random seed is set to None. You’re right, probably the error is there. Should I put it between parenthesis?

4

If you don’t want to set a random seed in your config file, just remove it from there. The default value is already set to None so no need to define it in your config file.

5

Yes, it was just a try for understanding how it worked, but that’s fine.

Could you please also help me to understand this?

Thank you

6

I assume that if you write random_seed: None into your config file, None will be interpreted as a String. So you should only put it with a valid number assigned to it.

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