Difficulties in NLU
The form and organisation of NL are quite diverse.
It's ambiguous, and there are many degrees of ambiguity.
- Lexical ambiguity occurs at a very basic level, such as the word level.
- For instance, is "board" a noun or a verb?
- Ambiguity at the syntactic level: A statement can be parsed in various ways.
- "He lifted the beetle with his crimson cap," for example. Did he lift a beetle with a red cap, or did he lift a beetle with a red cap?
- Referential ambiguity refers to when pronouns are used to refer to something. Rima, for example, went to Gauri. "I am tired," she stated. Who is it that is tired?
- A single input can have multiple meanings.
- Several inputs can have the same meaning.