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Table 4 Perplexity of Hub5’00-SWB and RT03S-FSH set for different LMs

From: Empirically combining unnormalized NNLM and back-off N-gram for fast N-best rescoring in speech recognition

Model Perplexity
  Hub5’00-SWB RT03S-FSH
KN3 89.40 66.76
KN5 86.78 63.80
+FNNLM 71.84 53.98
+RNNLM-C400 66.67 51.34
FNNLM 76.17 56.99
RNNLM-C400 70.83 54.39