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DS-1000 / 973 / I have the tensors:

Problem

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Problem:

I have the tensors:

ids: shape (70,3) containing indices like [[0,1,0],[1,0,0],[0,0,1],...]

x: shape(70,3,2)

ids tensor encodes the index of bold marked dimension of x which should be selected (1 means selected, 0 not). I want to gather the selected slices in a resulting vector:

result: shape (70,2)

Background:

I have some scores (shape = (70,3)) for each of the 3 elements and want only to select the one with the highest score.
Therefore, I made the index with the highest score to be 1, and rest indexes to be 0


A:

<code>
import numpy as np
import pandas as pd
import torch
ids, x = load_data()
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Pytorch

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Source and history

upstream_id / Original problem ID
973
task_id
84911c63-2a8b-55a7-8362-3cee6b73f0c8
task_key
default--test--973
task_revision_id
1
config / split
default / test

Official source

initial import