The rules in Rule-based POS tagging are built manually. These taggers are knowledge-driven taggers. Rule-based POS taggers possess the following properties − Second stage − In the second stage, it uses large lists of hand-written disambiguation rules to sort down the list to a single part-of-speech for each word. We can also understand Rule-based POS tagging by its two-stage architecture −įirst stage − In the first stage, it uses a dictionary to assign each word a list of potential parts-of-speech. Or, as Regular expression compiled into finite-state automata, intersected with lexically ambiguous sentence representation. For example, suppose if the preceding word of a word is article then word must be a noun.Īs the name suggests, all such kind of information in rule-based POS tagging is coded in the form of rules. Disambiguation can also be performed in rule-based tagging by analyzing the linguistic features of a word along with its preceding as well as following words. If the word has more than one possible tag, then rule-based taggers use hand-written rules to identify the correct tag. Rule-based taggers use dictionary or lexicon for getting possible tags for tagging each word. One of the oldest techniques of tagging is rule-based POS tagging. Most of the POS tagging falls under Rule Base POS tagging, Stochastic POS tagging and Transformation based tagging. We already know that parts of speech include nouns, verb, adverbs, adjectives, pronouns, conjunction and their sub-categories. In simple words, we can say that POS tagging is a task of labelling each word in a sentence with its appropriate part of speech. Now, if we talk about Part-of-Speech (PoS) tagging, then it may be defined as the process of assigning one of the parts of speech to the given word. Here the descriptor is called tag, which may represent one of the part-of-speech, semantic information and so on. Tagging is a kind of classification that may be defined as the automatic assignment of description to the tokens.
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