ArmNN TfLiteArmnnDelegate Request unknown backend GpuAcc

当我在开发板上运行Armnn示例程序 ImageClassification 提示 Request unknown backend GpuAcc请问这是怎么回事？

1. >$ python3.9 run_classifier.py \
   
2. --input_image cat.jpg \
   
3. --model_file mobilenet_v2_1.0_224_quantized_1_default_1.tflite \
   
4. --label_file labelmappings.txt \
   
5. --delegate_path libarmnnDelegate.so \
   
6. --preferred_backends GpuAcc CpuAcc CpuRef

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1. Info: ArmNN v32.0.0
   
2. Info: Initialization time: 8.22 ms.
   
3. INFO: TfLiteArmnnDelegate: <font color="#ff0000">Requested unknown backend GpuAcc</font>
   
4. INFO: TfLiteArmnnDelegate: Created TfLite ArmNN delegate.

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