A grammar model that puts probabilities on grammar rules.
PCFG is like a picky English teacher grading a messy sentence. It gives each possible reading a “yeah, probably” score.
It helps computers parse sentences and hear speech. It picks the most likely sentence structure.
Syntax Parse
PCFG scores different syntax trees and helps choose the most likely one.
PGM
A PGM view can explain how PCFG generates structure with uncertainty.
Penn Treebank
Penn Treebank trees are often used to estimate PCFG rule probabilities.