Fixed in_features dim if bidirectional is True

[farisalasmary]

Signed-off-by: Faris Abdullah Alasmary [email protected]

What does this PR do ?

Fix a bug in LSTM decoder while using bidirectional LSTM

Collection: ASR

Changelog

• Adding one line of code to check if the argument bidirectional is True and multiply lstm_hidden_size by 2 since the output vector of both directions have the same size and they are concatenated to form the final output of the LSTM model.

Usage

N/A

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[farisalasmary]

@titu1994

[titu1994]

@VahidooX for review. It does seem correct, but I dunno if we have pretrained models that won't work with this.