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# Tensorflow.js tf.log1p() Function

• Last Updated : 12 May, 2021

Tensorflow.js is an open-source library that is being developed by Google for running machine learning models as well as deep learning neural networks in the browser or node environment.

The .log1p() function is used to find the natural logarithm of the stated tensor input plus one i.e. ln(1 + x) and is done element wise.

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Syntax:

`tf.log1p(x)`

Parameters: This function accepts three parameters which are illustrated below:

• x: It is the tensor input, and it can be of type tf.Tensor, or TypedArray, or Array.

Return Value: It returns the tf.Tensor object.

Example 1:

## Javascript

 `// Importing the tensorflow.js library``import * as tf from ``"@tensorflow/tfjs"`` ` `// Defining tensor input elements``const y = tf.tensor1d([1, 15, 38, Math.E-1]);`` ` `// Calling log1p() method and``// printing output``y.log1p().print();`

Output:

```Tensor
[0.6931472, 2.7725887, 3.6635618, 1]```

Example 2: In this example, the parameter is passed directly to the log1p function.

## Javascript

 `// Importing the tensorflow.js library ``import * as tf from ``"@tensorflow/tfjs"`` ` `// Defining float values``var` `val = [0.5, 1.5, .66];`` ` `// Calling tensor1d method``const y = tf.tensor1d(val);`` ` `// Calling log1p() method``var` `res = tf.log1p(y)`` ` `// printing output``res.print();`

Output:

```Tensor
[0.4054651, 0.9162908, 0.5068176]```
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