Dutch Lemmatizer


This model uses context and language knowledge to assign all forms and inflections of a word to a single root. This enables the pipeline to treat the past and present tense of a verb, for example, as the same word instead of two completely different words. The lemmatizer takes into consideration the context surrounding a word to determine which root is correct when the word form alone is ambiguous.

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How to use

lemmatizer = LemmatizerModel.pretrained("lemma", "nl") \
        .setInputCols(["token"]) \
nlp_pipeline = Pipeline(stages=[document_assembler, tokenizer, lemmatizer])
light_pipeline = LightPipeline(nlp_pipeline.fit(spark.createDataFrame([['']]).toDF("text")))
results = light_pipeline.fullAnnotate("Behalve dat hij de koning van het noorden is, is John Snow een Engelse arts en een leider in de ontwikkeling van anesthesie en medische hygiëne.")

val lemmatizer = LemmatizerModel.pretrained("lemma", "nl")


[Row(annotatorType='token', begin=0, end=6, result='behalve', metadata={'sentence': '0'}, embeddings=[]),
Row(annotatorType='token', begin=8, end=10, result='dat', metadata={'sentence': '0'}, embeddings=[]),
Row(annotatorType='token', begin=12, end=14, result='hij', metadata={'sentence': '0'}, embeddings=[]),
Row(annotatorType='token', begin=16, end=17, result='de', metadata={'sentence': '0'}, embeddings=[]),
Row(annotatorType='token', begin=19, end=24, result='koning', metadata={'sentence': '0'}, embeddings=[]),

Model Information

Model Name: lemma
Type: lemmatizer
Compatibility: Spark NLP 2.5.0+
Edition: Official
Input labels: [token]
Output labels: [lemma]
Language: nl
Case sensitive: false
License: Open Source

Data Source

The model is imported from https://universaldependencies.org