nltk.StackDecoder.valid_phrases¶

static StackDecoder.valid_phrases(all_phrases_from, hypothesis)[source]¶

Extract phrases from all_phrases_from that contains words that have not been translated by hypothesis

Parameters:	all_phrases_from (list(list(int))) – Phrases represented by their spans, in the same format as the return value of find_all_src_phrases
Returns:	A list of phrases, represented by their spans, that cover untranslated positions.
Return type:	list(tuple(int, int))