How To Modify A Single Value Of A 2D Tensor Programatically By Index

I have a 2D tensor my_tensor size [50,50] and dtype int32 and I need to increment the value at one specific location. The indices of the location to be updated is given by 2 intege

Solution 1:

I have created an (5x5) unit matrix for sake of simplicity and updating them at indices (0,0) ,(1,1),(2,2),(3,3) (i.e at the first four diagonal elements) . First define the indices as tensors ,then values as tensors that will add up those at respective indices then update using "tf.tensor_scatter_nd_add" command . You can do similarly for a (50X50) matrix.Thanks!

import tensorflow as tf
indices = tf.constant([[0,0], [1,1], [2,2],[3,3]]) # updating at diagonal index elements, you can see the change
updates = tf.constant([9, 10, 11, 12])# values that will add up at respective indexes
print("original tensor is ")
tensor = tf.ones([5,5], dtype=tf.int32)
print(tensor)
print("updated tensor is ")
updated = tf.tensor_scatter_nd_add(tensor, indices, updates)
print(updated)