fix: atrous_rates for deeplabv3_mobilenet_v3_large (fixes #7956) #8019

nvs-abhilash · 2023-10-05T03:32:49Z

This PR addresses the issue reffered in #7956

The PR proposes the following changes to address the issues:

Parameterize atrous_rates for deeplabv3 in DeepLabHead.
~~Send (6, 12, 18) atrous_rates for mobilenet backbone~~

pytorch-bot · 2023-10-05T03:32:51Z

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NicolasHug

Thanks for the PR @nvs-abhilash .

I made a few comments below regarding preserving backward compatibility.

@fmassa , do you remember why the values [12, 24, 36] were used for the atrous rates in #820, instead of [6, 12, 18]?

NicolasHug · 2023-10-09T10:05:53Z

torchvision/models/segmentation/deeplabv3.py

@@ -220,7 +220,7 @@ def _deeplabv3_mobilenetv3(
    backbone = IntermediateLayerGetter(backbone, return_layers=return_layers)

    aux_classifier = FCNHead(aux_inplanes, num_classes) if aux else None
-    classifier = DeepLabHead(out_inplanes, num_classes)
+    classifier = DeepLabHead(out_inplanes, num_classes, atrous_rates=(6, 12, 18))


Unfortunately this would be BC-breaking. We'll have to preserve the values that are currently used here (relying on the default).

Suggested change

classifier = DeepLabHead(out_inplanes, num_classes, atrous_rates=(6, 12, 18))

classifier = DeepLabHead(out_inplanes, num_classes)

NicolasHug · 2023-10-09T10:07:58Z

torchvision/models/segmentation/deeplabv3.py

@@ -83,7 +83,7 @@ def forward(self, x: torch.Tensor) -> torch.Tensor:


 class ASPP(nn.Module):
-    def __init__(self, in_channels: int, atrous_rates: List[int], out_channels: int = 256) -> None:
+    def __init__(self, in_channels: int, atrous_rates: Tuple[int, int, int], out_channels: int = 256) -> None:


From my understanding, using List[int] instead of a fixed 3-tuple was intended (details in #2136).

Suggested change

def __init__(self, in_channels: int, atrous_rates: Tuple[int, int, int], out_channels: int = 256) -> None:

def __init__(self, in_channels: int, atrous_rates: List[int], out_channels: int = 256) -> None:

NicolasHug · 2023-10-09T10:08:21Z

torchvision/models/segmentation/deeplabv3.py

@@ -46,9 +46,9 @@ class DeepLabV3(_SimpleSegmentationModel):


 class DeepLabHead(nn.Sequential):
-    def __init__(self, in_channels: int, num_classes: int) -> None:
+    def __init__(self, in_channels: int, num_classes: int, atrous_rates: Tuple[int, int, int] = (12, 24, 36)) -> None:


Suggested change

def __init__(self, in_channels: int, num_classes: int, atrous_rates: Tuple[int, int, int] = (12, 24, 36)) -> None:

def __init__(self, in_channels: int, num_classes: int, atrous_rates: List[int] = [12, 24, 36]) -> None:

fmassa · 2023-10-09T11:32:30Z

Hi,

Thanks for the PR!

The dilation rates could have been an oversight when porting the DeepLab head into MobileNetV3.
That being said, using a larger dilation factor in the backbone (as done in the ResNet variants) makes the model much slower to run, so maybe the configuration done here (with the larger dilation in the head) actually yields better accuracies for a smaller computation budget (but this would need to be verified).

Changing the defaults will change the outputs produced by the models, so I agree with @NicolasHug to keep the same defaults as before.

nvs-abhilash · 2023-10-09T20:24:55Z

Thanks, @NicolasHug and @fmassa for reviewing my code.

Post your comments, the only change that seems to make sense is just to parameterise the atrous_rates parameter. I've updated the commit incorporating the same.

Also, what can be the path to solve #7956 ?

NicolasHug

Thanks @nvs-abhilash , LGTM with one last comment below

NicolasHug · 2023-10-10T08:03:45Z

torchvision/models/segmentation/deeplabv3.py

@@ -46,9 +46,9 @@ class DeepLabV3(_SimpleSegmentationModel):


 class DeepLabHead(nn.Sequential):
-    def __init__(self, in_channels: int, num_classes: int) -> None:
+    def __init__(self, in_channels: int, num_classes: int, atrous_rates: List[int] = [12, 24, 36]) -> None:


We should avoid setting mutables as default values in general as there's a risk that we will change that value inplace, and subsequent calls would be using the wrong default.

Suggested change

def __init__(self, in_channels: int, num_classes: int, atrous_rates: List[int] = [12, 24, 36]) -> None:

def __init__(self, in_channels: int, num_classes: int, atrous_rates: Sequence[int] = (12, 24, 36)) -> None:

Yeah, makes sense. I thought the same, therefore had made it tuple before. 😅

Updated the PR.

NicolasHug · 2023-10-10T08:05:35Z

Also, what can be the path to solve #7956 ?

Would documenting the atrous rates being used be enough?

NicolasHug

Thanks a lot @nvs-abhilash

github-actions · 2023-10-11T10:49:13Z

Hey @NicolasHug!

You merged this PR, but no labels were added. The list of valid labels is available at https://github.com/pytorch/vision/blob/main/.github/process_commit.py

) (#8019) Summary: Co-authored-by: Nicolas Hug <[email protected]> Reviewed By: vmoens Differential Revision: D50789082 fbshipit-source-id: 02bbe21ba09522b2db1552c6a677b89ff4247392

facebook-github-bot added the cla signed label Oct 5, 2023

nvs-abhilash mentioned this pull request Oct 7, 2023

Misconfiguration of MobileNetV3-Large backbone for DeepLabV3 #7956

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nvs-abhilash force-pushed the mobilenet-fix branch from 73ef094 to 17b530d Compare October 9, 2023 20:19

nvs-abhilash requested a review from NicolasHug October 9, 2023 20:27

NicolasHug reviewed Oct 10, 2023

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feat: parameterize atrous_rates for deeplabv3 in DeepLabHead.

67dce75

nvs-abhilash force-pushed the mobilenet-fix branch from 17b530d to 67dce75 Compare October 10, 2023 16:20

nvs-abhilash requested a review from NicolasHug October 10, 2023 16:21

NicolasHug approved these changes Oct 11, 2023

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Merge branch 'main' into mobilenet-fix

c65397d

NicolasHug merged commit 70a8e05 into pytorch:main Oct 11, 2023
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fix: atrous_rates for deeplabv3_mobilenet_v3_large (fixes #7956) #8019

fix: atrous_rates for deeplabv3_mobilenet_v3_large (fixes #7956) #8019

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	classifier = DeepLabHead(out_inplanes, num_classes, atrous_rates=(6, 12, 18))
	classifier = DeepLabHead(out_inplanes, num_classes)

	def __init__(self, in_channels: int, atrous_rates: Tuple[int, int, int], out_channels: int = 256) -> None:
	def __init__(self, in_channels: int, atrous_rates: List[int], out_channels: int = 256) -> None:

	def __init__(self, in_channels: int, num_classes: int, atrous_rates: Tuple[int, int, int] = (12, 24, 36)) -> None:
	def __init__(self, in_channels: int, num_classes: int, atrous_rates: List[int] = [12, 24, 36]) -> None:

fix: atrous_rates for deeplabv3_mobilenet_v3_large (fixes #7956) #8019

fix: atrous_rates for deeplabv3_mobilenet_v3_large (fixes #7956) #8019

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8019

❌ 1 New Failure, 14 Unrelated Failures

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