Tensorflow.js tf.layers build() Method

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

The .build() function is used to create the weights of the layer stated. This method should be applied on every layers that hold weights. Moreover, its invoked when the apply() method is invoked in order to build the weights.

Syntax:

build(inputShape)

Parameters:

inputShape: It is the stated shape or an array of shape that is untouched.

Return Value: It returns void.

Example 1:

Javascript

// Importing the tensorflow.js library 

import * as tf from "@tensorflow/tfjs"

// Creating a model 
const model = tf.sequential(); 

// Adding a layer 
model.add(tf.layers.dense({units: 1, inputShape: [3]})); 

// Defining input 
const input = tf.input({shape: [6, 2, 6]}); 

// Calling build method with its  
// parameter 
model.layers[0].build([input.Shape]); 

// Printing output 
console.log(JSON.stringify(input.shape)); 
model.layers[0].getWeights()[0].print();

Output:

[null,6,2,6]
Tensor
    [[-0.3726568],
     [0.7343086 ],
     [-0.2459907]]

Here, getWeights() method is used to print the weights.

Example 2:

Javascript

// Importing the tensorflow.js library 
//import * as tf from "@tensorflow/tfjs" 

  
// Creating a model 
const model = tf.sequential(); 

  
// Adding layers 
model.add(tf.layers.dense({units: 1, inputShape: [2]})); 
model.add(tf.layers.dense({units: 2})); 

  

  
// Defining inputs 
const input1 = tf.input({shape: [1, 2]}); 
const input2 = tf.input({shape: [1.7, 2.7, 6.5]}); 

  
// Calling build method with its  
// parameter 
model.layers[0].build([input1.Shape]); 
model.layers[1].build([input2.Shape]); 

  
// Printing outputs 
console.log(JSON.stringify(input1.shape)); 
console.log(JSON.stringify(input2.shape)); 
model.layers[0].getWeights()[0].print(); 
model.layers[1].getWeights()[0].print();

Output:

[null,1,2]
[null,1.7,2.7,6.5]
Tensor
    [[0.6224715],
     [1.2144204]]
Tensor
     [[0.8342852, 0.4770206],]

Reference: https://js.tensorflow.org/api/latest/#tf.layers.Layer.build

Article Tags :

JavaScript

Web Technologies

Tensorflow.js