def METHOD_NAME(self, batch, stage):
    "Given an input batch it computes the binary probability."
    batch = batch.to(self.device)
    wavs, lens = batch.sig
    feats = self.hparams.compute_features(wavs)
    feats = self.modules.mean_var_norm(feats, lens)
    x, _ = self.modules.rnn(feats)
    outputs = self.modules.lin(x)
    return outputs, lens