xử lý ngôn ngữ tự nhiên,kai wei chang,www cs virginia edu Jason’s ice cream • P(”1,2,1”)? CS6501 Natural Language Processing 1 p( |C) p( |H) p( |START) p(1| ) 0 5 0 1 p(2| ) 0 4 0 2 p(3| ) 0 1 0 7 p(C[.]
Scroll to the bottom to see a graph of what states and transitions the model thinks are likely on each day Those likely states and transitions can be used to reestimate the red probabilities (this is the "forwardbackward" or Baum-Welch algorithm), incr p(…|C) p(…|H) p(…|START) p(1|…) 0.5 0.1 p(2|…) 0.4 0.2 p(3|…) 0.1 0.7 p(C|…) 0.8 0.2 0.5 p(H|…) 0.2 0.8 0.5 Jason’s ice cream #cones • P(”1,2,1”)? 𝛼" “𝐶” 0.25 0.084 0.0354 0.5 0.4 0.5 0.8 0.8 C C C 0.5 0.2 0.2 0.5 0.2 H H 0.2 0.03852 H 0.8 0.2 0.1 𝛼" “𝐻” 0.05 0.018 0.00312 0.1 0.8 CS6501 Natural Language Processing CuuDuongThanCong.com https://fb.com/tailieudientucntt Scroll to the bottom to see a graph of what states and transitions the model thinks are likely on each day Those likely states and transitions can be used to reestimate the red probabilities (this is the "forwardbackward" or Baum-Welch algorithm), incr p(…|C) p(…|H) p(…|START) p(1|…) 0.5 0.1 p(2|…) 0.4 0.2 p(3|…) 0.1 0.7 p(C|…) 0.8 0.2 0.5 p(H|…) 0.2 0.8 0.5 Jason’s ice cream #cones • P(”1,2,1”)? 𝛿" “𝐶” 0.25 0.08 0.032 0.5 0.4 0.5 0.8 0.8 C C C 0.5 0.2 0.2 0.5 0.2 H 0.1 H 0.8 0.2 0.2 0.8 0.032 H 0.1 𝛿 " “𝐻” 0.05 0.01 0.016 CS6501 Natural Language Processing CuuDuongThanCong.com https://fb.com/tailieudientucntt ... 0.5 0.2 0.2 0.5 0.2 H 0.1 H 0.8 0.2 0.2 0.8 0.032 H 0.1