# mx.symbol.linalg_trmm¶

## Description¶

Performs multiplication with a lower triangular matrix. Input are tensors A, B, each of dimension n >= 2 and having the same shape on the leading n-2 dimensions.

If n=2, A must be triangular. The operator performs the BLAS3 function trmm:

out = alpha * op(A) * B

if rightside=False, or

out = alpha * B * op(A)

if rightside=True. Here, alpha is a scalar parameter, and op() is either the identity or the matrix transposition (depending on transpose).

If n>2, trmm is performed separately on the trailing two dimensions for all inputs (batch mode).

Note

The operator supports float32 and float64 data types only.

Example:

Single triangular matrix multiply
A = [[1.0, 0], [1.0, 1.0]]
B = [[1.0, 1.0, 1.0], [1.0, 1.0, 1.0]]
trmm(A, B, alpha=2.0) = [[2.0, 2.0, 2.0], [4.0, 4.0, 4.0]]

Batch triangular matrix multiply
A = [[[1.0, 0], [1.0, 1.0]], [[1.0, 0], [1.0, 1.0]]]
B = [[[1.0, 1.0, 1.0], [1.0, 1.0, 1.0]], [[0.5, 0.5, 0.5], [0.5, 0.5, 0.5]]]
trmm(A, B, alpha=2.0) = [[[2.0, 2.0, 2.0], [4.0, 4.0, 4.0]],
[[1.0, 1.0, 1.0], [2.0, 2.0, 2.0]]]


## Usage¶

mx.symbol.linalg_trmm(...)


## Arguments¶

Argument

Description

A

NDArray-or-Symbol.

Tensor of lower triangular matrices

B

NDArray-or-Symbol.

Tensor of matrices

transpose

boolean, optional, default=0.

Use transposed of the triangular matrix

rightside

boolean, optional, default=0.

Multiply triangular matrix from the right to non-triangular one.

lower

boolean, optional, default=1.

True if the triangular matrix is lower triangular, false if it is upper triangular.

alpha

double, optional, default=1.

Scalar factor to be applied to the result.

name

string, optional.

Name of the resulting symbol.

## Value¶

out The result mx.symbol