[Bug] support rtmdet-ins for ascend backend

[tycallen]

Motivation

Now the rtmdet-ins model can't be convert to ascend backend, cause the param output_index is True

mmdeploy/mmdeploy/codebase/mmdet/models/dense_heads/rtmdet_ins_head.py

Line 144 in bc75c9d

output_index=True)

but in ascend multiclass_nms, the output_index=True is not supported

mmdeploy/mmdeploy/mmcv/ops/nms.py

Line 747 in bc75c9d

assert not output_index, 'output_index is not supported on this backend.'

Any way to go around with this, or any suggest for infer rtmdet-ins on ascend?

Related resources

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Additional context

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