MatrixSetDiag

public final class MatrixSetDiag

Returns a batched matrix tensor with new batched diagonal values.

Given `input` and `diagonal`, this operation returns a tensor with the same shape and values as `input`, except for the specified diagonals of the innermost matrices. These will be overwritten by the values in `diagonal`.

`input` has `r+1` dimensions `[I, J, ..., L, M, N]`. When `k` is scalar or `k[0] == k[1]`, `diagonal` has `r` dimensions `[I, J, ..., L, max_diag_len]`. Otherwise, it has `r+1` dimensions `[I, J, ..., L, num_diags, max_diag_len]`. `num_diags` is the number of diagonals, `num_diags = k[1] - k[0] + 1`. `max_diag_len` is the longest diagonal in the range `[k[0], k[1]]`, `max_diag_len = min(M + min(k[1], 0), N + min(-k[0], 0))`

The output is a tensor of rank `k+1` with dimensions `[I, J, ..., L, M, N]`. If `k` is scalar or `k[0] == k[1]`: 

output[i, j, ..., l, m, n]
   = diagonal[i, j, ..., l, n-max(k[1], 0)] ; if n - m == k[1]
     input[i, j, ..., l, m, n]              ; otherwise
Otherwise, 
output[i, j, ..., l, m, n]
   = diagonal[i, j, ..., l, diag_index, index_in_diag] ; if k[0] <= d <= k[1]
     input[i, j, ..., l, m, n]                         ; otherwise
where `d = n - m`, `diag_index = k[1] - d`, and `index_in_diag = n - max(d, 0) + offset`.

`offset` is zero except when the alignment of the diagonal is to the right. 

offset = max_diag_len - diag_len(d) ; if (`align` in {RIGHT_LEFT, RIGHT_RIGHT
                                            and `d >= 0`) or
                                          (`align` in {LEFT_RIGHT, RIGHT_RIGHT}
                                            and `d <= 0`)
          0                          ; otherwise
 }
 where `diag_len(d) = min(cols - max(d, 0), rows + min(d, 0))`.

For example: 

# The main diagonal.
 input = np.array([[[7, 7, 7, 7],              # Input shape: (2, 3, 4)
                    [7, 7, 7, 7],
                    [7, 7, 7, 7]],
                   [[7, 7, 7, 7],
                    [7, 7, 7, 7],
                    [7, 7, 7, 7]]])
 diagonal = np.array([[1, 2, 3],               # Diagonal shape: (2, 3)
                      [4, 5, 6]])
 tf.matrix_set_diag(input, diagonal)
   ==> [[[1, 7, 7, 7],  # Output shape: (2, 3, 4)
         [7, 2, 7, 7],
         [7, 7, 3, 7]],
        [[4, 7, 7, 7],
         [7, 5, 7, 7],
         [7, 7, 6, 7]]]
 
 # A superdiagonal (per batch).
 tf.matrix_set_diag(input, diagonal, k = 1)
   ==> [[[7, 1, 7, 7],  # Output shape: (2, 3, 4)
         [7, 7, 2, 7],
         [7, 7, 7, 3]],
        [[7, 4, 7, 7],
         [7, 7, 5, 7],
         [7, 7, 7, 6]]]
 
 # A band of diagonals.
 diagonals = np.array([[[0, 9, 1],  # Diagonal shape: (2, 4, 3)
                        [6, 5, 8],
                        [1, 2, 3],
                        [4, 5, 0]],
                       [[0, 1, 2],
                        [5, 6, 4],
                        [6, 1, 2],
                        [3, 4, 0]]])
 tf.matrix_set_diag(input, diagonals, k = (-1, 2))
   ==> [[[1, 6, 9, 7],  # Output shape: (2, 3, 4)
         [4, 2, 5, 1],
         [7, 5, 3, 8]],
        [[6, 5, 1, 7],
         [3, 1, 6, 2],
         [7, 4, 2, 4]]]
 
 # LEFT_RIGHT alignment.
 diagonals = np.array([[[9, 1, 0],  # Diagonal shape: (2, 4, 3)
                        [6, 5, 8],
                        [1, 2, 3],
                        [0, 4, 5]],
                       [[1, 2, 0],
                        [5, 6, 4],
                        [6, 1, 2],
                        [0, 3, 4]]])
 tf.matrix_set_diag(input, diagonals, k = (-1, 2), align="LEFT_RIGHT")
   ==> [[[1, 6, 9, 7],  # Output shape: (2, 3, 4)
         [4, 2, 5, 1],
         [7, 5, 3, 8]],
        [[6, 5, 1, 7],
         [3, 1, 6, 2],
         [7, 4, 2, 4]]]

Nested Classes

class MatrixSetDiag.Options Optional attributes for MatrixSetDiag  

Constants

String OP_NAME The name of this op, as known by TensorFlow core engine

Public Methods

static MatrixSetDiag.Options
align(String align)
Output<T>
asOutput()
Returns the symbolic handle of the tensor.
static <T extends TType> MatrixSetDiag<T>
create(Scope scope, Operand<T> input, Operand<T> diagonal, Operand<TInt32> k, Options... options)
Factory method to create a class wrapping a new MatrixSetDiag operation.
Output<T>
output()
Rank `r+1`, with `output.shape = input.shape`.

Inherited Methods

Constants

public static final String OP_NAME

The name of this op, as known by TensorFlow core engine

Constant Value: "MatrixSetDiagV3"

Public Methods

public static MatrixSetDiag.Options align (String align)

Parameters
align Some diagonals are shorter than `max_diag_len` and need to be padded. `align` is a string specifying how superdiagonals and subdiagonals should be aligned, respectively. There are four possible alignments: "RIGHT_LEFT" (default), "LEFT_RIGHT", "LEFT_LEFT", and "RIGHT_RIGHT". "RIGHT_LEFT" aligns superdiagonals to the right (left-pads the row) and subdiagonals to the left (right-pads the row). It is the packing format LAPACK uses. cuSPARSE uses "LEFT_RIGHT", which is the opposite alignment.

public Output<T> asOutput ()

Returns the symbolic handle of the tensor.

Inputs to TensorFlow operations are outputs of another TensorFlow operation. This method is used to obtain a symbolic handle that represents the computation of the input.

public static MatrixSetDiag<T> create (Scope scope, Operand<T> input, Operand<T> diagonal, Operand<TInt32> k, Options... options)

Factory method to create a class wrapping a new MatrixSetDiag operation.

Parameters
scope current scope
input Rank `r+1`, where `r >= 1`.
diagonal Rank `r` when `k` is an integer or `k[0] == k[1]`. Otherwise, it has rank `r+1`. `k >= 1`.
k Diagonal offset(s). Positive value means superdiagonal, 0 refers to the main diagonal, and negative value means subdiagonals. `k` can be a single integer (for a single diagonal) or a pair of integers specifying the low and high ends of a matrix band. `k[0]` must not be larger than `k[1]`.
options carries optional attributes values
Returns
  • a new instance of MatrixSetDiag

public Output<T> output ()

Rank `r+1`, with `output.shape = input.shape`.