/// Takes an input tensor of shape \f$(d_1,\dots,d_n)\f$ and pads by inserting a scalar \f$x\f$ supplied as input, in three possible ways:
///
/// 1. <i>(exterior padding)</i> inserts copies of \f$x\f$ <i>below or above</i> the bounds of existing rows, columns, etc.,
/// 2. <i>(interior padding)</i> inserts copies of \f$x\f$ <i>between</i> rows, columns, etc., or
/// 3. both of the above.
///
/// The number and position of elements to be inserted along a given axis is determined by three parameters:
///
/// 1. <i>(the padding-below sizes)</i> a vector of non-negative integers \f$(p_1,\dots,p_n)\f$,
/// 2. <i>(the padding-above sizes)</i> a vector of non-negative integers \f$(q_1,\dots,q_n)\f$, and
/// 3. <i>(the interior padding sizes)</i> a vector of non-negative integers \f$(r_1,\dots,r_n)\f$.
///
/// The output tensor will have the shape \f$(d'_1,\dots,d'_n)\f$ where \f$d'_i = p_i + (d_i - 1)(r_i + 1) + 1 + q_i\f$ if \f$d_i > 0\f$, and \f$d'_i = p_i + q_i\f$ if \f$d_i = 0\f$.
///
/// Example: given a 3x3 tensor, with interior-padding sizes of `{1,2}`, padding-below of `{1,2}`, padding-above of `{1,0}`, and a pad-value of `42`, we obtain:
///
/// ```
/// 42 42 42 42 42 42 42 42 42
/// 42 42 1 42 42 2 42 42 3
/// 1 2 3 42 42 42 42 42 42 42 42 42
/// 4 5 6 --> 42 42 4 42 42 5 42 42 6
/// 7 8 9 42 42 42 42 42 42 42 42 42
/// 42 42 7 42 42 8 42 42 9
/// 42 42 42 42 42 42 42 42 42
/// ```
///
/// In other words we have inserted one new row between each pair of adjacent rows, two new columns between each pair of adjacent columns, one new row at
/// the top and two new columns on the left, and one new row at the bottom and zero new columns on the right; then filled the new rows and columns with `42`.
///
/// (Note that `below` and `above` here refer respectively to lower- or higher-numbered coordinate indices, and numbering starts at the upper-left corner;
/// thus inserting a row "below" actually inserts it at the "top" of the matrix.)
///
classPad:publicRequiresTensorViewArgs
{
public:
/// \brief Constructs a generic padding operation.
///
/// \param arg The node producing input tensor to be padded.
/// \param arg_pad_value The node producing the scalar value to be inserted for padding.
/// \param padding_below The padding-below widths.
/// \param padding_above The padding-above widths.
/// \param padding_interior The interior-padding widths.
