outputs (`torch.FloatTensor` of shape `(batch_size, channels, seq_len)`: Hidden-states as transformed by the piecewise rational quadratic function with the `tail_bound` limits applied. log_abs_det (`torch.FloatTensor` of shape `(batch_size, channels, seq_len)`: Logarithm of the absolute value of the determinants corresponding to the `outputs` with the `tail_bound` limits applied. r