Fixes thrust::unique_by_key examples

[elstehle]

Description

Fixes unique_by_key examples.

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[github-actions]

🟩 CI finished in 5h 02m: Pass: 100%/249 | Total: 4d 18h | Avg: 27m 38s | Max: 50m 10s | Hits: 67%/248433

• 🟩 cub: Pass: 100%/131 | Total: 2d 18h | Avg: 30m 27s | Max: 46m 05s | Hits: 63%/109167

  🟩 cpu
    🟩 amd64              Pass: 100%/123 | Total:  2d 13h | Avg: 30m 13s | Max: 46m 05s | Hits:  64%/102351
    🟩 arm64              Pass: 100%/8   | Total:  4h 32m | Avg: 34m 01s | Max: 35m 59s | Hits:  51%/6816  
  🟩 ctk
    🟩 11.1               Pass: 100%/15  | Total:  7h 29m | Avg: 29m 59s | Max: 46m 05s | Hits:  50%/11568 
    🟩 11.8               Pass: 100%/3   | Total:  2h 11m | Avg: 43m 44s | Max: 45m 48s | Hits:  51%/2556  
    🟩 12.5               Pass: 100%/113 | Total:  2d 08h | Avg: 30m 09s | Max: 43m 54s | Hits:  65%/95043 
  🟩 cudacxx
    🟩 ClangCUDA17        Pass: 100%/2   | Total: 41m 53s | Avg: 20m 56s | Max: 21m 16s | Hits:  55%/1408  
    🟩 nvcc11.1           Pass: 100%/15  | Total:  7h 29m | Avg: 29m 59s | Max: 46m 05s | Hits:  50%/11568 
    🟩 nvcc11.8           Pass: 100%/3   | Total:  2h 11m | Avg: 43m 44s | Max: 45m 48s | Hits:  51%/2556  
    🟩 nvcc12.5           Pass: 100%/111 | Total:  2d 08h | Avg: 30m 19s | Max: 43m 54s | Hits:  65%/93635 
  🟩 cudacxx_family
    🟩 ClangCUDA          Pass: 100%/2   | Total: 41m 53s | Avg: 20m 56s | Max: 21m 16s | Hits:  55%/1408  
    🟩 nvcc               Pass: 100%/129 | Total:  2d 17h | Avg: 30m 35s | Max: 46m 05s | Hits:  63%/107759
  🟩 cxx
    🟩 Clang9             Pass: 100%/6   | Total:  3h 12m | Avg: 32m 08s | Max: 39m 11s | Hits:  51%/4890  
    🟩 Clang10            Pass: 100%/3   | Total:  1h 44m | Avg: 34m 58s | Max: 35m 38s | Hits:  51%/2562  
    🟩 Clang11            Pass: 100%/4   | Total:  2h 15m | Avg: 33m 46s | Max: 35m 40s | Hits:  51%/3416  
    🟩 Clang12            Pass: 100%/4   | Total:  2h 16m | Avg: 34m 06s | Max: 36m 58s | Hits:  51%/3416  
    🟩 Clang13            Pass: 100%/4   | Total:  2h 17m | Avg: 34m 22s | Max: 36m 26s | Hits:  51%/3416  
    🟩 Clang14            Pass: 100%/4   | Total:  2h 13m | Avg: 33m 18s | Max: 34m 26s | Hits:  51%/3416  
    🟩 Clang15            Pass: 100%/4   | Total:  2h 14m | Avg: 33m 43s | Max: 34m 24s | Hits:  51%/3408  
    🟩 Clang16            Pass: 100%/4   | Total:  2h 16m | Avg: 34m 07s | Max: 36m 03s | Hits:  51%/3408  
    🟩 Clang17            Pass: 100%/26  | Total: 10h 39m | Avg: 24m 36s | Max: 35m 28s | Hits:  82%/21856 
    🟩 GCC6               Pass: 100%/2   | Total: 57m 17s | Avg: 28m 38s | Max: 28m 48s | Hits:  50%/1552  
    🟩 GCC7               Pass: 100%/6   | Total:  3h 10m | Avg: 31m 41s | Max: 35m 17s | Hits:  50%/4893  
    🟩 GCC8               Pass: 100%/6   | Total:  3h 08m | Avg: 31m 29s | Max: 34m 40s | Hits:  50%/4893  
    🟩 GCC9               Pass: 100%/6   | Total:  3h 12m | Avg: 32m 00s | Max: 36m 37s | Hits:  50%/4893  
    🟩 GCC10              Pass: 100%/4   | Total:  2h 18m | Avg: 34m 44s | Max: 35m 31s | Hits:  51%/3416  
    🟩 GCC11              Pass: 100%/7   | Total:  4h 26m | Avg: 38m 03s | Max: 45m 48s | Hits:  51%/5964  
    🟩 GCC12              Pass: 100%/4   | Total:  2h 20m | Avg: 35m 05s | Max: 39m 14s | Hits:  51%/3408  
    🟩 GCC13              Pass: 100%/28  | Total: 11h 26m | Avg: 24m 32s | Max: 35m 59s | Hits:  78%/23856 
    🟩 Intel2023.2.0      Pass: 100%/3   | Total:  1h 53m | Avg: 37m 44s | Max: 39m 21s | Hits:  50%/2334  
    🟩 MSVC14.16          Pass: 100%/1   | Total: 46m 05s | Avg: 46m 05s | Max: 46m 05s | Hits:  53%/695   
    🟩 MSVC14.29          Pass: 100%/2   | Total:  1h 27m | Avg: 43m 33s | Max: 43m 37s | Hits:  53%/1390  
    🟩 MSVC14.39          Pass: 100%/3   | Total:  2h 10m | Avg: 43m 28s | Max: 43m 54s | Hits:  53%/2085  
  🟩 cxx_family
    🟩 Clang              Pass: 100%/59  | Total:  1d 05h | Avg: 29m 40s | Max: 39m 11s | Hits:  64%/49788 
    🟩 GCC                Pass: 100%/63  | Total:  1d 07h | Avg: 29m 32s | Max: 45m 48s | Hits:  63%/52875 
    🟩 Intel              Pass: 100%/3   | Total:  1h 53m | Avg: 37m 44s | Max: 39m 21s | Hits:  50%/2334  
    🟩 MSVC               Pass: 100%/6   | Total:  4h 23m | Avg: 43m 56s | Max: 46m 05s | Hits:  53%/4170  
  🟩 gpu
    🟩 v100               Pass: 100%/131 | Total:  2d 18h | Avg: 30m 27s | Max: 46m 05s | Hits:  63%/109167
  🟩 jobs
    🟩 Build              Pass: 100%/99  | Total:  2d 07h | Avg: 33m 30s | Max: 46m 05s | Hits:  51%/81903 
    🟩 DeviceLaunch       Pass: 100%/8   | Total:  2h 35m | Avg: 19m 25s | Max: 21m 50s | Hits:  99%/6816  
    🟩 GraphCapture       Pass: 100%/8   | Total:  2h 09m | Avg: 16m 07s | Max: 18m 41s | Hits:  99%/6816  
    🟩 HostLaunch         Pass: 100%/8   | Total:  2h 35m | Avg: 19m 28s | Max: 21m 41s | Hits:  99%/6816  
    🟩 TestGPU            Pass: 100%/8   | Total:  3h 51m | Avg: 28m 53s | Max: 33m 25s | Hits:  99%/6816  
  🟩 sm
    🟩 60;70;80;90        Pass: 100%/3   | Total:  2h 11m | Avg: 43m 44s | Max: 45m 48s | Hits:  51%/2556  
    🟩 90a                Pass: 100%/4   | Total:  1h 14m | Avg: 18m 38s | Max: 19m 51s | Hits:  51%/3408  
  🟩 std
    🟩 11                 Pass: 100%/34  | Total: 16h 59m | Avg: 29m 58s | Max: 41m 16s | Hits:  62%/28537 
    🟩 14                 Pass: 100%/37  | Total: 19h 17m | Avg: 31m 17s | Max: 46m 05s | Hits:  62%/30622 
    🟩 17                 Pass: 100%/36  | Total: 18h 30m | Avg: 30m 50s | Max: 45m 48s | Hits:  62%/29855 
    🟩 20                 Pass: 100%/24  | Total: 11h 41m | Avg: 29m 14s | Max: 42m 51s | Hits:  68%/20153 
  

• 🟩 thrust: Pass: 100%/118 | Total: 2d 00h | Avg: 24m 32s | Max: 50m 10s | Hits: 71%/139266

  🟩 cpu
    🟩 amd64              Pass: 100%/110 | Total:  1d 20h | Avg: 24m 27s | Max: 50m 10s | Hits:  71%/129822
    🟩 arm64              Pass: 100%/8   | Total:  3h 25m | Avg: 25m 37s | Max: 27m 29s | Hits:  66%/9444  
  🟩 ctk
    🟩 11.1               Pass: 100%/15  | Total:  6h 07m | Avg: 24m 31s | Max: 45m 14s | Hits:  64%/17705 
    🟩 11.8               Pass: 100%/3   | Total:  1h 46m | Avg: 35m 35s | Max: 37m 30s | Hits:  66%/3543  
    🟩 12.5               Pass: 100%/100 | Total:  1d 16h | Avg: 24m 12s | Max: 50m 10s | Hits:  72%/118018
  🟩 cudacxx
    🟩 ClangCUDA17        Pass: 100%/2   | Total: 49m 22s | Avg: 24m 41s | Max: 24m 48s | Hits:  65%/2360  
    🟩 nvcc11.1           Pass: 100%/15  | Total:  6h 07m | Avg: 24m 31s | Max: 45m 14s | Hits:  64%/17705 
    🟩 nvcc11.8           Pass: 100%/3   | Total:  1h 46m | Avg: 35m 35s | Max: 37m 30s | Hits:  66%/3543  
    🟩 nvcc12.5           Pass: 100%/98  | Total:  1d 15h | Avg: 24m 11s | Max: 50m 10s | Hits:  72%/115658
  🟩 cudacxx_family
    🟩 ClangCUDA          Pass: 100%/2   | Total: 49m 22s | Avg: 24m 41s | Max: 24m 48s | Hits:  65%/2360  
    🟩 nvcc               Pass: 100%/116 | Total:  1d 23h | Avg: 24m 31s | Max: 50m 10s | Hits:  71%/136906
  🟩 cxx
    🟩 Clang9             Pass: 100%/6   | Total:  2h 23m | Avg: 23m 57s | Max: 26m 58s | Hits:  66%/7080  
    🟩 Clang10            Pass: 100%/3   | Total:  1h 19m | Avg: 26m 23s | Max: 27m 56s | Hits:  66%/3540  
    🟩 Clang11            Pass: 100%/4   | Total:  1h 42m | Avg: 25m 43s | Max: 29m 07s | Hits:  66%/4720  
    🟩 Clang12            Pass: 100%/4   | Total:  1h 46m | Avg: 26m 35s | Max: 28m 12s | Hits:  66%/4720  
    🟩 Clang13            Pass: 100%/4   | Total:  1h 40m | Avg: 25m 07s | Max: 26m 44s | Hits:  66%/4720  
    🟩 Clang14            Pass: 100%/4   | Total:  1h 42m | Avg: 25m 40s | Max: 27m 19s | Hits:  66%/4720  
    🟩 Clang15            Pass: 100%/4   | Total:  1h 41m | Avg: 25m 17s | Max: 26m 36s | Hits:  66%/4720  
    🟩 Clang16            Pass: 100%/4   | Total:  1h 44m | Avg: 26m 10s | Max: 28m 05s | Hits:  66%/4720  
    🟩 Clang17            Pass: 100%/18  | Total:  5h 28m | Avg: 18m 14s | Max: 28m 46s | Hits:  81%/21240 
    🟩 GCC6               Pass: 100%/2   | Total: 44m 07s | Avg: 22m 03s | Max: 23m 32s | Hits:  67%/2360  
    🟩 GCC7               Pass: 100%/6   | Total:  2h 25m | Avg: 24m 11s | Max: 26m 24s | Hits:  59%/7086  
    🟩 GCC8               Pass: 100%/6   | Total:  2h 27m | Avg: 24m 38s | Max: 31m 02s | Hits:  59%/7086  
    🟩 GCC9               Pass: 100%/6   | Total:  2h 30m | Avg: 25m 08s | Max: 28m 51s | Hits:  66%/7086  
    🟩 GCC10              Pass: 100%/4   | Total:  1h 51m | Avg: 27m 51s | Max: 30m 44s | Hits:  66%/4724  
    🟩 GCC11              Pass: 100%/7   | Total:  3h 39m | Avg: 31m 17s | Max: 37m 30s | Hits:  66%/8267  
    🟩 GCC12              Pass: 100%/4   | Total:  1h 50m | Avg: 27m 37s | Max: 30m 19s | Hits:  66%/4724  
    🟩 GCC13              Pass: 100%/20  | Total:  5h 50m | Avg: 17m 31s | Max: 29m 36s | Hits:  79%/23620 
    🟩 Intel2023.2.0      Pass: 100%/3   | Total:  1h 42m | Avg: 34m 02s | Max: 37m 03s | Hits:  67%/3549  
    🟩 MSVC14.16          Pass: 100%/1   | Total: 45m 14s | Avg: 45m 14s | Max: 45m 14s | Hits:  64%/1176  
    🟩 MSVC14.29          Pass: 100%/2   | Total:  1h 36m | Avg: 48m 00s | Max: 49m 15s | Hits:  64%/2352  
    🟩 MSVC14.39          Pass: 100%/6   | Total:  3h 22m | Avg: 33m 48s | Max: 50m 10s | Hits:  81%/7056  
  🟩 cxx_family
    🟩 Clang              Pass: 100%/51  | Total: 19h 29m | Avg: 22m 56s | Max: 29m 07s | Hits:  71%/60180 
    🟩 GCC                Pass: 100%/55  | Total: 21h 19m | Avg: 23m 15s | Max: 37m 30s | Hits:  69%/64953 
    🟩 Intel              Pass: 100%/3   | Total:  1h 42m | Avg: 34m 02s | Max: 37m 03s | Hits:  67%/3549  
    🟩 MSVC               Pass: 100%/9   | Total:  5h 44m | Avg: 38m 13s | Max: 50m 10s | Hits:  76%/10584 
  🟩 gpu
    🟩 v100               Pass: 100%/118 | Total:  2d 00h | Avg: 24m 32s | Max: 50m 10s | Hits:  71%/139266
  🟩 jobs
    🟩 Build              Pass: 100%/99  | Total:  1d 20h | Avg: 27m 07s | Max: 50m 10s | Hits:  65%/116850
    🟩 TestCPU            Pass: 100%/11  | Total:  1h 41m | Avg:  9m 13s | Max: 19m 01s | Hits:  99%/12972 
    🟩 TestGPU            Pass: 100%/8   | Total:  1h 47m | Avg: 13m 29s | Max: 15m 57s | Hits:  99%/9444  
  🟩 sm
    🟩 60;70;80;90        Pass: 100%/3   | Total:  1h 46m | Avg: 35m 35s | Max: 37m 30s | Hits:  66%/3543  
    🟩 90a                Pass: 100%/4   | Total: 58m 52s | Avg: 14m 43s | Max: 16m 02s | Hits:  66%/4724  
  🟩 std
    🟩 11                 Pass: 100%/30  | Total: 10h 25m | Avg: 20m 51s | Max: 33m 25s | Hits:  72%/35418 
    🟩 14                 Pass: 100%/34  | Total: 14h 51m | Avg: 26m 13s | Max: 48m 36s | Hits:  68%/40122 
    🟩 17                 Pass: 100%/33  | Total: 14h 27m | Avg: 26m 17s | Max: 50m 10s | Hits:  70%/38946 
    🟩 20                 Pass: 100%/21  | Total:  8h 29m | Avg: 24m 17s | Max: 50m 06s | Hits:  73%/24780 
  

👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
	libcu++
	CUB
+/-	Thrust
	CUDA Experimental

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
	libcu++
+/-	CUB
+/-	Thrust
	CUDA Experimental

🏃‍ Runner counts (total jobs: 249)

#	Runner
178	linux-amd64-cpu16
40	linux-amd64-gpu-v100-latest-1
16	linux-arm64-cpu16
15	windows-amd64-cpu16