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[Relax][ONNX] Set max_output_boxes_per_class default value to 0 for NonMaxSuppression #19547

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Merged
tlopex merged 3 commits into from
May 13, 2026
+61 −4
Merged

[Relax][ONNX] Set max_output_boxes_per_class default value to 0 for NonMaxSuppression #19547

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13052ca
[Relax][ONNX] Set `max_output_boxes_per_class` default value to 0
cchung100m May 12, 2026
146054e
[Relax][ONNX] Set max_output_boxes_per_class default value to 0
cchung100m May 12, 2026
4c6e1aa
[Relax][ONNX] Add test case: test_nms_max_output_boxes_per_class_zero
cchung100m May 12, 2026
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4 changes: 2 additions & 2 deletions python/tvm/relax/frontend/onnx/onnx_frontend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4757,9 +4757,9 @@ def _impl_v10(cls, bb, inputs, attr, params):
_, param_value = params[1][var_name]
max_output_boxes_per_class = int(param_value.numpy().item())
else:
max_output_boxes_per_class = 100 # Default value
max_output_boxes_per_class = 0 # Default value
else:
max_output_boxes_per_class = 100 # Default value
max_output_boxes_per_class = 0 # Default value
Comment on lines +4760 to +4762
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@gemini-code-assist gemini-code-assist Bot May 12, 2026

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medium

The default value for max_output_boxes_per_class is updated to 0 here to align with the ONNX specification. However, AllClassNMS._impl_v1 (lines 4849 and 4851) still uses 100 as the default value. To maintain consistency across the ONNX frontend, AllClassNMS should also be updated to use 0 as the default value.


if iou_threshold is not None and isinstance(iou_threshold, relax.Constant):
iou_threshold = float(iou_threshold.data.numpy())
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