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Diffstat (limited to 'algorithms/bleu.py')
-rwxr-xr-x | algorithms/bleu.py | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/algorithms/bleu.py b/algorithms/bleu.py new file mode 100755 index 0000000..77c3c82 --- /dev/null +++ b/algorithms/bleu.py @@ -0,0 +1,19 @@ +#!/usr/bin/env python2 + +import math + + +def BLEU(N, w, v): + sum = 0 + for i in range(N): + j = i+1 + if v[i] == 0: continue + sum += (w[i]*math.exp(math.log(v[i])))/(2**(N-j+1)) + print v[i], math.log(v[i]), w[i] * math.log(v[i]), w[i] + return sum + +N = 4 +w = [1.0/N for i in range(N)] +v = [0.1, 0.1, 0.1, 0.1] +print BLEU(N, w, v) + |