from __future__ import division import math MAXSCORE = 99 def EgivenF(ctx): # p(e|f) = c(e, f)/c(f) if not ctx.online: prob = ctx.paircount/ctx.fcount else: prob = (ctx.paircount + ctx.online.paircount) / (ctx.fcount + ctx.online.fcount) return -math.log10(prob) def CountEF(ctx): # c(e, f) if not ctx.online: count = 1 + ctx.paircount else: count = 1 + ctx.paircount + ctx.online.paircount return math.log10(count) def SampleCountF(ctx): # sample c(f) if not ctx.online: count = 1 + ctx.fsample_count else: count = 1 + ctx.fsample_count + ctx.online.fsample_count return math.log10(count) def EgivenFCoherent(ctx): # c(e, f) / sample c(f) if not ctx.online: prob = ctx.paircount/ctx.fsample_count else: prob = (ctx.paircount + ctx.online.paircount) / (ctx.fsample_count + ctx.online.fsample_count) return -math.log10(prob) if prob > 0 else MAXSCORE def CoherenceProb(ctx): # c(f) / sample c(f) if not ctx.online: prob = ctx.fcount/ctx.fsample_count else: prob = (ctx.fcount + ctx.online.fcount) / (ctx.fsample_count + ctx.online.fsample_count) return -math.log10(prob) def MaxLexEgivenF(ttable): def MaxLexEgivenF(ctx): fwords = ctx.fphrase.words fwords.append('NULL') def score(): for e in ctx.ephrase.words: maxScore = max(ttable.get_score(f, e, 0) for f in fwords) yield -math.log10(maxScore) if maxScore > 0 else MAXSCORE return sum(score()) return MaxLexEgivenF def MaxLexFgivenE(ttable): def MaxLexFgivenE(ctx): ewords = ctx.ephrase.words ewords.append('NULL') def score(): for f in ctx.fphrase.words: maxScore = max(ttable.get_score(f, e, 1) for e in ewords) yield -math.log10(maxScore) if maxScore > 0 else MAXSCORE return sum(score()) return MaxLexFgivenE def IsSingletonF(ctx): if not ctx.online: count = ctx.fcount else: count = ctx.fcount + ctx.online.fcount return (count == 1) def IsSingletonFE(ctx): if not ctx.online: count = ctx.paircount else: count = ctx.paircount + ctx.online.paircount return (count == 1) def IsNotSingletonF(ctx): if not ctx.online: count = ctx.fcount else: count = ctx.fcount + ctx.online.fcount return (count > 1) def IsNotSingletonFE(ctx): if not ctx.online: count = ctx.paircount else: count = ctx.paircount + ctx.online.paircount return (ctx.paircount > 1) def IsFEGreaterThanZero(ctx): if not ctx.online: count = ctx.paircount else: count = ctx.paircount + ctx.online.paircount return (ctx.paircount > 0.01) def IsSupportedOnline(ctx): # Occurs in online data? if ctx.online: return (ctx.online.fcount > 0.01) else: return False