Aishell dataset evaluation.

[pkuyym]

First we compare the impact for larger language model under default golden settings.

Language Model	CER
Released	0.094452
Larger	0.088407

[pkuyym]

Next we will tune the alpha and beta on validation data (using released LM).
alpha=2.6; beta=5.0

Language Model	CER
Released	0.090202
Larger	0.084202

[shanyi15]

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