Add stateful-transducer-onnx label scorer #149
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Add a new label scorer class
StatefulTransducerOnnxLabelScorer. This is similar to theStatefulOnnxLabelScorerbut hidden-state and encoder features are decoupled. Here, the state initializer and state updater only take tokens and no encoder features. Instead, the scorer receives the encoder state at the current time step and the hidden state and is supposed to combine the two.This can be used for transducer models with unlimited context.
Depends on #144.