Enable fp16+int4 mixed precission path for int4 xpu path with int zero point #2240
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/2240
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For XPU device, when user select the int zero point, the _torch.ops.aten.weight_int4pack_mm_with_scales_and_zeros kernel operator will be used to do A16W4 computation. Both Afp16W4 and ABF16int4 are supported in this op on XPU device, while only the BF16 activation is supported in the torchAO now, In this PR we want to unlock the FP16 activation support.