#NEWLINE# def elu( x , alpha = 1.0 ) : #NEWLINE# #INDENT# 'Exponential Linear Unit function.\n\n    This function is expressed as\n\n    .. math::\n        f(x) = \\left \\{ \\begin{array}{ll}\n        x & {\\rm if}~ x \\ge 0 \\\\\n        \\alpha (\\exp(x) - 1) & {\\rm if}~ x < 0,\n        \\end{array} \\right.\n\n    where :math:`\\alpha` is a parameter.\n    See: http://arxiv.org/abs/1511.07289\n\n    Args:\n        x (~chainer.Variable): Input variable.\n        alpha (float): Parameter :math:`\\alpha`.\n\n    Returns:\n        ~chainer.Variable: Output variable.\n\n    ' #NEWLINE# return ELU ( alpha = alpha ) ( x )