| // |
| // This confidential and proprietary software may be used only as |
| // authorised by a licensing agreement from ARM Limited |
| // (C) COPYRIGHT 2020-2024 ARM Limited |
| // ALL RIGHTS RESERVED |
| // The entire notice above must be reproduced on all authorised |
| // copies and copies may only be made to the extent permitted |
| // by a licensing agreement from ARM Limited. |
| |
| === Scatter/Gather Operators |
| |
| ==== GATHER |
| |
| Generate a tensor for which each element in the output is a subtensor of the values tensor based on the indices. |
| N is the number of batches, W the number of indices in each batch, K the range of each index and C the number data channels for each index. |
| |
| include::{generated}/operators/GATHER.adoc[] |
| |
| [source,c++] |
| ---- |
| include::{pseudocode}/operators/GATHER.tosac[lines=10..-1] |
| ---- |
| |
| ==== SCATTER |
| |
| The values_out tensor is set to the values_in tensor with data modified as follows: data from the input tensor is inserted at the positions specified by the indices tensor. |
| N is the number of batches, W the number of indices in each batch, K the range of each index and C the number data channels for each index. |
| It is not permitted to repeat the same output index within a single SCATTER operation and so each output index occurs at most once. |
| It follows that K >= W. |
| In use cases that require multiple updates to the same output position, these must be decomposed into multiple SCATTER operations. |
| |
| include::{generated}/operators/SCATTER.adoc[] |
| |
| [source,c++] |
| ---- |
| include::{pseudocode}/operators/SCATTER.tosac[lines=10..-1] |
| ---- |