Senna is a powerful tool for NLP with the help of Senna the process like NER, POS, Chunker and SRL process can be done but NLTK have a interface mode to Senna but don't provide interface compelete use of the tool( lack api SRL). Sematic Role Labelling is process using NLP.
Practical Natural Language Processing Tools for Humans. Dependency Parsing, Syntactic Constituent Parsing, Semantic Role Labeling, Named Entity Recognisation, Shallow chunking, Part of Speech Tagging, all in Python.
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