GPU exists but nvcc are not installed system-wide (usually only installed inside conda environments) and the installation script failed

[frankxu2004]

In tools/Makefile

# Set if install binaries on CPU mode e.g. make CPU_ONLY=1
# If you don't have any GPUs, this value will be set automatically
ifeq ($(shell which nvcc),) # 'nvcc' not found
CPU_ONLY := 0
else
CPU_ONLY :=
endif