[Enhancement]: Support fcn_unet deployment with dynamic shape

docs/en/codebases/mmseg.md

@@ -15,7 +15,7 @@ Please refer to [get_started.md](https://github.com/open-mmlab/mmsegmentation/bl
 | DeepLabV3                   |      Y      |    Y     |  Y   |   Y   |    Y     |   [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/deeplabv3)   |
 | DeepLabV3+                  |      Y      |    Y     |  Y   |   Y   |    Y     | [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/deeplabv3plus) |
 | Fast-SCNN[*](#static_shape) |      Y      |    Y     |  N   |   Y   |    Y     |   [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/fastscnn)    |
-| UNet[*](#static_shape)      |      Y      |    Y     |  Y   |   Y   |    Y     |     [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/unet)      |
+| UNet                        |      Y      |    Y     |  Y   |   Y   |    Y     |     [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/unet)      |
 | ANN[*](#static_shape)       |      Y      |    Y     |  N   |   N   |    N     |      [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/ann)      |
 | APCNet                      |      Y      |    Y     |  Y   |   N   |    N     |    [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/apcnet)     |
 | BiSeNetV1                   |      Y      |    Y     |  Y   |   N   |    Y     |   [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/bisenetv1)   |

docs/en/supported_models.md

@@ -29,7 +29,7 @@ The table below lists the models that are guaranteed to be exportable to other b
 | DeepLabV3                 | MMSegmentation   |      Y      |      Y      |    Y     |  Y   |   Y   |    Y     | [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/deeplabv3)           |
 | DeepLabV3+                | MMSegmentation   |      Y      |      Y      |    Y     |  Y   |   Y   |    Y     | [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/deeplabv3plus)       |
 | Fast-SCNN[*static](#note) | MMSegmentation   |      Y      |      Y      |    Y     |  N   |   Y   |    Y     | [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/fastscnn)            |
-| UNet[*static](#note)      | MMSegmentation   |      Y      |      Y      |    Y     |  Y   |   Y   |    Y     | [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/unet)                |
+| UNet                      | MMSegmentation   |      Y      |      Y      |    Y     |  Y   |   Y   |    Y     | [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/unet)                |
 | ANN[*](#note)             | MMSegmentation   |      ?      |      Y      |    Y     |  N   |   N   |    N     | [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/ann)                 |
 | APCNet                    | MMSegmentation   |      ?      |      Y      |    Y     |  Y   |   N   |    N     | [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/apcnet)              |
 | BiSeNetV1                 | MMSegmentation   |      ?      |      Y      |    Y     |  Y   |   N   |    Y     | [config](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/bisenetv1)           |

mmdeploy/codebase/mmseg/models/__init__.py

@@ -1,3 +1,4 @@
 # Copyright (c) OpenMMLab. All rights reserved.
 from .decode_heads import *  # noqa: F401,F403
 from .segmentors import *  # noqa: F401,F403
+from .utils import *  # noqa: F401,F403

mmdeploy/codebase/mmseg/models/utils/__init__.py

@@ -0,0 +1,4 @@
+# Copyright (c) OpenMMLab. All rights reserved.
+from .up_conv_block import up_conv_block__forward
+
+__all__ = ['up_conv_block__forward']

mmdeploy/codebase/mmseg/models/utils/up_conv_block.py

@@ -0,0 +1,37 @@
+# Copyright (c) OpenMMLab. All rights reserved.
+
+import torch
+
+from mmdeploy.core import FUNCTION_REWRITER
+from mmdeploy.utils import is_dynamic_shape
+
+
+@FUNCTION_REWRITER.register_rewriter(
+    func_name='mmseg.models.utils.UpConvBlock.forward')
+def up_conv_block__forward(ctx, self, skip, x):
+    """Rewrite `forward` for default backend.
+
+    To support dynamic shape for UNet backbone,
+    upsample feature maps with `size` instead of `scale_factor`
+
+    Args:
+        ctx (ContextCaller): The context with additional information.
+        self: The instance of the original class.
+        skip (Tensor): Skip branch feature.
+        x (Tensor): Input feature to be upsampled.
+
+    Returns:
+        Tensor: Upsampled output feature map.
+    """
+    if is_dynamic_shape(ctx.cfg):
+        # upsample with `size` instead of `scale_factor`
+        from mmseg.ops import Upsample
+        for c in self.upsample.interp_upsample:
+            if isinstance(c, Upsample):
+                c.size = skip.shape[-2:]
+                c.scale_factor = None
+
+    x = self.upsample(x)
+    out = torch.cat([skip, x], dim=1)
+    out = self.conv_block(out)
+    return out

mmdeploy/utils/test.py

@@ -333,9 +333,12 @@ def get_flatten_inputs(
         if isinstance(value, torch.Tensor):
             flatten_inputs[name] = value
         elif isinstance(value, (list, tuple)):
-            for i, tensor in enumerate(value):
-                name_i = f'{name}_{i}'
-                flatten_inputs[name_i] = tensor
+            if len(value) == 1:
+                flatten_inputs[name] = value[0]
+            else:
+                for i, tensor in enumerate(value):
+                    name_i = f'{name}_{i}'
+                    flatten_inputs[name_i] = tensor
     return flatten_inputs
 
 
@@ -358,15 +361,29 @@ def get_onnx_model(wrapped_model: nn.Module,
     patched_model = patch_model(
         wrapped_model, cfg=deploy_cfg, backend=backend.value)
     flatten_model_inputs = get_flatten_inputs(model_inputs)
-    input_names = [k for k, v in flatten_model_inputs.items() if k != 'ctx']
+    input_names = onnx_cfg.get('input_names', None)
+    if input_names is None:
+        input_names = [
+            k for k, v in flatten_model_inputs.items() if k != 'ctx'
+        ]
     output_names = onnx_cfg.get('output_names', None)
     dynamic_axes = get_dynamic_axes(deploy_cfg, input_names)
 
+    class DummyModel(torch.nn.Module):
+
+        def __init__(self):
+            super(DummyModel, self).__init__()
+            self.model = patched_model
+
+        def forward(self, inputs: dict):
+            return self.model(**inputs)
+
+    model = DummyModel().eval()
+
     with RewriterContext(
             cfg=deploy_cfg, backend=backend.value, opset=11), torch.no_grad():
         torch.onnx.export(
-            patched_model,
-            tuple([v for k, v in model_inputs.items()]),
+            model, (model_inputs, {}),
             onnx_file_path,
             export_params=True,
             input_names=input_names,
@@ -421,8 +438,13 @@ def get_backend_outputs(ir_file_path: str,
     """
     backend = get_backend(deploy_cfg)
     flatten_model_inputs = get_flatten_inputs(model_inputs)
-    input_names = [k for k, v in flatten_model_inputs.items() if k != 'ctx']
-    output_names = get_ir_config(deploy_cfg).get('output_names', None)
+    ir_config = get_ir_config(deploy_cfg)
+    input_names = ir_config.get('input_names', None)
+    output_names = ir_config.get('output_names', None)
+    if input_names is None:
+        input_names = [
+            k for k, v in flatten_model_inputs.items() if k != 'ctx'
+        ]
 
     # prepare backend model and input features
     if backend == Backend.TENSORRT:

tests/test_codebase/test_mmseg/test_mmseg_models.py

@@ -9,7 +9,7 @@
 from mmseg.models.decode_heads.decode_head import BaseDecodeHead
 
 from mmdeploy.codebase import import_codebase
-from mmdeploy.utils import Backend, Codebase
+from mmdeploy.utils import Backend, Codebase, Task
 from mmdeploy.utils.test import (WrapModel, check_backend, get_model_outputs,
                                  get_rewrite_outputs)
 
@@ -261,3 +261,56 @@ def test_emamodule_forward(backend):
         model_outputs.shape)
     assert torch.allclose(
         rewrite_outputs, model_outputs, rtol=1e-03, atol=1e-05)
+
+
+@pytest.mark.parametrize('is_dynamic_shape', [True, False])
+@pytest.mark.parametrize('backend', [Backend.ONNXRUNTIME])
+def test_upconvblock_forward(backend, is_dynamic_shape):
+    check_backend(backend)
+    from mmseg.models.backbones.unet import BasicConvBlock
+    from mmseg.models.utils import UpConvBlock
+
+    head = UpConvBlock(BasicConvBlock, 16, 8, 8).eval()
+    dynamic_axes = {
+        'x': {
+            0: 'b',
+            2: 'h',
+            3: 'w'
+        },
+        'skip': {
+            0: 'b',
+            2: 'h',
+            3: 'w'
+        },
+        'output': {
+            0: 'b',
+            2: 'h',
+            3: 'w'
+        },
+    } if is_dynamic_shape else None
+    deploy_cfg = mmcv.Config(
+        dict(
+            backend_config=dict(type=backend.value),
+            onnx_config=dict(
+                input_names=['skip', 'x'],
+                output_names=['output'],
+                dynamic_axes=dynamic_axes),
+            codebase_config=dict(
+                type=Codebase.MMSEG.value, task=Task.SEGMENTATION.value)))
+    x = torch.randn(1, 16, 16, 16)
+    skip = torch.randn(1, 8, 32, 32)
+    model_inputs = {'x': x, 'skip': skip}
+    with torch.no_grad():
+        model_outputs = get_model_outputs(head, 'forward', model_inputs)
+
+    wrapped_model = WrapModel(head, 'forward')
+    rewrite_outputs, is_backend_output = get_rewrite_outputs(
+        wrapped_model=wrapped_model,
+        model_inputs=model_inputs,
+        deploy_cfg=deploy_cfg)
+    if is_backend_output:
+        rewrite_outputs = rewrite_outputs[0]
+    rewrite_outputs = rewrite_outputs.to(model_outputs).reshape(
+        model_outputs.shape)
+    assert torch.allclose(
+        rewrite_outputs, model_outputs, rtol=1e-03, atol=1e-05)