function sigmoid_(x) {
    const $x = (0, _tensorUtilEnv.convertToTensor)(x, "x", "sigmoid", "float32");
    const inputs = {
        x: $x
    };
    return (0, _engine.ENGINE).runKernel((0, _kernelNames.Sigmoid), inputs);
}
Computes sigmoid element-wise, `1 / (1 + exp(-x))`

```js
const x = tf.tensor1d([0, -1, 2, -3]);

x.sigmoid().print();  // or tf.sigmoid(x)
```
@param x The input tensor.

@doc {heading: 'Operations', subheading: 'Basic math'}