Is sparse tensor multiplication implemented in TensorFlow?

Question

Multiplication of sparse tensors with themselves or with dense tensors does not seem to work in TensorFlow. The following example

Answer 1

It seems that

tf.sparse_matmul(
    a,
    b,
    transpose_a=None,
    transpose_b=None,
    a_is_sparse=None,
    b_is_sparse=None,
    name=None
)

is not for multiplication of two SparseTensors.

a and b are Tensors not SparseTensors. And I have tried that, it is not working with SparseTensors.