I have check the error, for some card, yes, just like what I said above,
some cards does not support double type, so we must check the opencl
extension: cl_khr_fp64 before the kernel compile. If the device support,
we use GPU, else, we use CPU or use float type, Is it OK?

Best regards

Of course, if there's a way to only fall back to floats if doubles are not available, that'd be preferable.

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