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textToWordSequence in KerasTokenizer fails with UnsupportedOperationException #7073

aladjov opened this issue Jan 25, 2019 · 3 comments


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commented Jan 25, 2019

Issue Description

Run-time error when processing text like this: "KINSHASA: Opposition leader Felix Tshisekedi"
The problem is triggered by the ":" because of the following two lines:
List<String> seqList = Arrays.asList(sequences);
Arrays.asList creates an unmodifiable list which contains an empty element ""
seqList.removeAll(Arrays.asList("", null));
This line tries to modify the fixed list and throws UnsupportedOperationException

Please describe our issue, along with:

  • expected behavior
    ["kinshasa", "opposition", "leader", "felix", "tshisekedi"]
  • encountered behavior

Version Information

Please indicate relevant versions, including, if relevant:

  • Deeplearning4j version
  • platform information (OS, etc)
    Ubuntu 18
  • CUDA version, if used
  • NVIDIA driver version, if in use


Easy fix would be to initialize the seqList like this:
List<String> seqList = new ArrayList<String>(Arrays.asList(sequences));
Is there any contributing guidance or I should make Pull request directly. I did spotted some other bugs in the same module which I can try to fix and add some unit tests


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commented Jan 30, 2019

@aladjov thanks for spotting this. yeah, by all means go ahead and create a pull request. Ping me once you're ready, I'm happy to help and review.


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commented Apr 9, 2019

Fixed #7500


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commented May 17, 2019

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

@lock lock bot locked and limited conversation to collaborators May 17, 2019

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