Transform the elements of a tensor in TensorFlow into a standard JavaScript array

Having utilized the outerProduct feature within the TensorFlow.js framework on two 1D arrays (a,b), I am faced with a challenge in obtaining the values of the produced tensor in regular JavaScript format.

Despite attempts using .dataSync and Array.from(), achieving the desired output format continues to be elusive. The anticipated outcome of the outer product calculation between the two 1D arrays should result in a 2D array, however, a 1D array is what I am receiving instead.

const a = tf.tensor1d([1, 2]);
const b = tf.tensor1d([3, 4]);
const tensor = tf.outerProduct(b, a);
const values = tensor.dataSync();
const array1 = Array.from(values);

console.log(array1);

The expected value for array1 is [ [ 3, 6 ] , [ 4, 8 ] ], but the actual result is array1 = [ 3, 6, 4, 8 ]

Answer №1

Version < 15

When working with tf.data or tf.dataSync, the output is always a flattened array. However, by utilizing the shape of the tensor, it is possible to transform it into a multi-dimensional array using methods like map and reduce.

const x = tf.tensor3d([1, 2 , 3, 4 , 5, 6, 7, 8], [2, 4, 1]);

x.print()

// flatten array
let arr = x.dataSync()

// convert to multiple dimensional array
shape = x.shape
shape.reverse().map(a => {
  arr = arr.reduce((b, c) => {
  latest = b[b.length - 1]
  latest.length < a ? latest.push(c) : b.push([c])
  return b
}, [[]])
console.log(arr)
})
<html>
  <head>
    <!-- Load TensorFlow.js -->
    <script src="https://cdn.jsdelivr.net/npm/@tensorflow/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="1a6e7c70695a2a342b2e342b">[email protected]</a>"> </script>
  </head>

  <body>
  </body>
</html>

From version 0.15

To achieve this transformation, one can utilize tensor.array() or tensor.arraySync()

Answer №2

Starting from tfjs version 0.15.1, you have the option to retrieve the nested array using await tensor.array().

Answer №3

If you have some numbers and want to manipulate them, try this:

const numbers = [7, 2, 5, 9];

let newArr = []

for (var j = 0; j < numbers.length; j += 2) {
  newArr.push([numbers[j], numbers[j + 1]])
}

console.log(newArr)

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