* (x + 0.044715 * x^3)))` or `x * P(X &lt;= x) = 0.5 * x * (1 + erf(x / sqrt(2)))`,
where P(X) ~ N(0, 1), depending on whether approximation is enabled.</p>

    <h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
    <pre class="examples"><div class='input'>
<span class='kw'>if</span> (<span class='fl'>FALSE</span>) {
<span class='fu'><a href='https://rdrr.io/r/base/library.html'>library</a></span>(<span class='no'>keras</span>)
<span class='fu'><a href='https://rdrr.io