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Notes on HW#3

Notes on HW#3. Outline: Induce grammar from (small) treebank Implement Probabilistic CKY Evaluate parser Improve parser. Treebank Format. Adapted from Penn Treebank Format Rules simplified: Removed traces and other null elements Removed complex tags

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Notes on HW#3

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  1. Notes on HW#3 • Outline: • Induce grammar from (small) treebank • Implement Probabilistic CKY • Evaluate parser • Improve parser

  2. Treebank Format • Adapted from Penn Treebank Format • Rules simplified: • Removed traces and other null elements • Removed complex tags • Reformatted POS tags as non-terminals

  3. Reading the Parses • POS unary collapse: • (NP_NNP Ontario) • was • (NP (NNP Ontario)) • Binarization: • VP -> VP’ PP; VP’ -> VB PP • Was • VP -> VB PP PP

  4. Start Early!

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