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I am using rasa nlu for training an NLU system to detect intents and slots. Now, some languages have word endings with their nouns (like Finnish, e.g. "in Berlin" -> "Berliinissä"). I have tried to annotate the characters in the training data as entities, but then I run the model, it doesn't detect the characters inside the word. When those characters are a separate word, only then they're detected. I am unable to think of an implementation to effectively detect named entities within a word. Suggestions needed.

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You could use a tool to decompose composite word. There are many open source softwares for various languages. For example : german-word-splitter

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