to prune
        name (str): parameter name within ``module`` on which pruning
                will act.
        amount (int or float): quantity of parameters to prune.
            If ``float``, should be between 0.0 and 1.0 and represent the
            fraction of parameters to prune. If ``int``, it represents the
            absolute number of parameters to prune.
        importance_scores (torch.Tensor): tensor of importance scores (of same
            shape as module parameter) used to compute mask for pruning.
            The values in this tensor indicate the importance of the corresponding
            elements in the parameter being pruned.
            If unspecified or None, the module parameter will be used in its place.

    Returns:
        module (nn.Module): modified (i.e. pruned) version of the input module

    Examples:
        >>> # xdoctest: +SKIP
        >>> m = prune.l1_unstructured(nn.Linear(2, 3), 'weight', amount=0.2)
        >>> m.state_dict().keys()
        odict_keys(['bias', 'weight_orig', 'weight_mask'])
    rŒ