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ResNet50 Inference Time less on LITTLE core than big core


I am working on Hikey970 board with ARM Mali-G72 MP12 GPU. I am using ARM Compute Library and following repo mentioned below:

I have executed 5 networks and observed inference times on CPU bit core, CPU LITTLE core and GPU. For ResNet50, the CPU LITTLE core outperforms both big core and GPU. I tried using specific core fully for ResNet50 only, and still the inference time is more in big core. Could you guys help me understand why ResNet50 shows such behavior?