'Performs element-wise less than or equal testing on each element of
left and right, storing the result in out. Each operand is assumed to
be the same shape (or broadcastable as such).
Arguments:
a (Tensor, numeric): left-hand side operand.
b (Tensor, numeric): right-hand side operand.
out (Tensor, optional): where the result will be stored. If out is
None, only the op-tree will be returned.
Returns:
OpTreeNode: the resulting op-tree'

def less_equal(self, a, b, out=None):

    return OpTreeNode.build('le', a, b, out=out)
