spectrograms, labels, input_lengths, label_lengths = batch

spectrograms: torch.Size([8, 1, 128, 644])
labels: torch.Size([8, 108])
input_lengths: 8
label_lengths: 8

    hparams = {
        "n_cnn_layers": 3,
        "n_rnn_layers": 5,
        "rnn_dim": 512,
        "n_class": 38,
        "n_feats": 128,
        "stride": 2,
        "dropout": 0.1,
        "learning_rate": 0.002,
        "batch_size": 8,
        "epochs": 3
    }