[Feature] Add Ops of StyleGAN3 (#2290)

* add bias_act

* support bias_act

* support filtered_lrelu

* support filtered_lrelu and upfirdn2d

* support conv2d_gradfix and fix filtered_lrelu

* fix lint

* fix lint

* fix c++ lint

* fix part comments

* fix lint

* rm redundant header

* fix upgrade pip

* fix as comment

* fix c++ lint

* fix ci

* fix-ut

* fix as comments

* add grad check

* remove redundant template

* Update mmcv/ops/bias_act.py
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* add typehint

* fix as comment:

* complete type hints

* fix lint

* add test for conv_gradfix

* add test for conv_gradfix

* fix lint

* modify licenses and ops.md

* add zh op md

* add torch version policy for conv2d_gradfix

* fix lint

* fix as comments

* rename impl

* rm redudant function and add ut

* fix as comment

* fix lint

* fix lint

* fix as comments

* fix lint

* fix ut

* fix as comment

* fix as comment

* fix as comment

---------
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

LICENSES.md

@@ -3,6 +3,9 @@
 In this file, we list the operations with other licenses instead of Apache 2.0. Users should be careful about adopting these operations in any commercial matters.
 
 |    Operation     |                                                                             Files                                                                              |    License     |
-| :--------------: | :---------------------------------------------------------------------------------------------------------------------------------------------------------------: | :------------: |
-|    upfirdn2d     |          [mmcv/ops/csrc/pytorch/cuda/upfirdn2d_kernel.cu](https://github.com/open-mmlab/mmcv/blob/master/mmcv/ops/csrc/pytorch/cuda/upfirdn2d_kernel.cu)          | NVIDIA License |
-| fused_leaky_relu | [mmcv/ops/csrc/pytorch/cuda/fused_bias_leakyrelu_cuda.cu](https://github.com/open-mmlab/mmcv/blob/master/mmcv/ops/csrc/pytorch/cuda/fused_bias_leakyrelu_cuda.cu) | NVIDIA License |
+| :--------------: | :------------------------------------------------------------------------------------------------------------------------------------------------------------: | :------------: |
+|    upfirdn2d     |          [mmcv/ops/csrc/pytorch/cuda/upfirdn2d_kernel.cu](https://github.com/open-mmlab/mmcv/tree/2.x/mmcv/ops/csrc/pytorch/cuda/upfirdn2d_kernel.cu)          | NVIDIA License |
+| fused_leaky_relu | [mmcv/ops/csrc/pytorch/cuda/fused_bias_leakyrelu_cuda.cu](https://github.com/open-mmlab/mmcv/tree/2.x/mmcv/ops/csrc/pytorch/cuda/fused_bias_leakyrelu_cuda.cu) | NVIDIA License |
+|     bias_act     |             [mmcv/ops/csrc/pytorch/cuda/bias_act_cuda.cu](https://github.com/open-mmlab/mmcv/tree/2.x/mmcv/ops/csrc/pytorch/cuda/bias_act_cuda.cu)             | NVIDIA License |
+|  filtered_lrelu  |            [mmcv/ops/csrc/pytorch/cuda/filtered_lrelu.cu](https://github.com/open-mmlab/mmcv/tree/2.x/mmcv/ops/csrc/pytorch/cuda/filtered_lrelu.cu)            | NVIDIA License |
+|  conv2d_gradfix  |                              [mmcv/ops/conv2d_gradfix.py](https://github.com/open-mmlab/mmcv/tree/2.x/mmcv/ops/conv2d_gradfix.py)                              | NVIDIA License |

docs/en/understand_mmcv/ops.md

@@ -61,3 +61,6 @@ We implement common ops used in detection, segmentation, etc.
 | Voxelization                 | √   | √    |     |     | √      |
 | PrRoIPool                    |     | √    |     |     |        |
 | BezierAlign                  | √   | √    |     |     |        |
+| BiasAct                      |     | √    |     |     |        |
+| FilteredLrelu                |     | √    |     |     |        |
+| Conv2dGradfix                |     | √    |     |     |        |

docs/zh_cn/understand_mmcv/ops.md

@@ -61,3 +61,6 @@ MMCV 提供了检测、分割等任务中常用的算子
 | Voxelization                 | √   | √    |     |     | √      |
 | PrRoIPool                    |     | √    |     |     |        |
 | BezierAlign                  | √   | √    |     |     |        |
+| BiasAct                      |     | √    |     |     |        |
+| FilteredLrelu                |     | √    |     |     |        |
+| Conv2dGradfix                |     | √    |     |     |        |

mmcv/ops/__init__.py

@@ -4,6 +4,7 @@ from .assign_score_withk import assign_score_withk
 from .ball_query import ball_query
 from .bbox import bbox_overlaps
 from .bezier_align import BezierAlign, bezier_align
+from .bias_act import bias_act
 from .border_align import BorderAlign, border_align
 from .box_iou_quadri import box_iou_quadri
 from .box_iou_rotated import box_iou_rotated
@@ -11,6 +12,7 @@ from .carafe import CARAFE, CARAFENaive, CARAFEPack, carafe, carafe_naive
 from .cc_attention import CrissCrossAttention
 from .chamfer_distance import chamfer_distance
 from .contour_expand import contour_expand
+from .conv2d_gradfix import conv2d, conv_transpose2d
 from .convex_iou import convex_giou, convex_iou
 from .corner_pool import CornerPool
 from .correlation import Correlation
@@ -22,6 +24,7 @@ from .deprecated_wrappers import ConvTranspose2d_deprecated as ConvTranspose2d
 from .deprecated_wrappers import Linear_deprecated as Linear
 from .deprecated_wrappers import MaxPool2d_deprecated as MaxPool2d
 from .diff_iou_rotated import diff_iou_rotated_2d, diff_iou_rotated_3d
+from .filtered_lrelu import filtered_lrelu
 from .focal_loss import (SigmoidFocalLoss, SoftmaxFocalLoss,
                          sigmoid_focal_loss, softmax_focal_loss)
 from .furthest_point_sample import (furthest_point_sample,
@@ -68,7 +71,7 @@ from .sync_bn import SyncBatchNorm
 from .three_interpolate import three_interpolate
 from .three_nn import three_nn
 from .tin_shift import TINShift, tin_shift
-from .upfirdn2d import upfirdn2d
+from .upfirdn2d import filter2d, upfirdn2d, upsample2d
 from .voxelize import Voxelization, voxelization
 
 __all__ = [
@@ -103,5 +106,6 @@ __all__ = [
     'points_in_boxes_cpu', 'points_in_boxes_all', 'points_in_polygons',
     'min_area_polygons', 'active_rotated_filter', 'convex_iou', 'convex_giou',
     'diff_iou_rotated_2d', 'diff_iou_rotated_3d', 'chamfer_distance',
-    'PrRoIPool', 'prroi_pool', 'BezierAlign', 'bezier_align'
+    'PrRoIPool', 'prroi_pool', 'bias_act', 'filtered_lrelu', 'conv2d',
+    'conv_transpose2d', 'filter2d', 'upsample2d', 'BezierAlign', 'bezier_align'
 ]

mmcv/ops/bias_act.py

+# Modified from
+# https://github.com/NVlabs/stylegan3/blob/main/torch_utils/ops/bias_act.py
+
+# Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+#
+# NVIDIA CORPORATION and its licensors retain all intellectual property
+# and proprietary rights in and to this software, related documentation
+# and any modifications thereto.  Any use, reproduction, disclosure or
+# distribution of this software and related documentation without an express
+# license agreement from NVIDIA CORPORATION is strictly prohibited.
+
+# source: https://github.com/open-mmlab/mmediting/blob/dev-1.x/mmedit/models/editors/stylegan3/stylegan3_ops/ops/bias_act.py # noqa
+"""Custom PyTorch ops for efficient bias and activation."""
+
+from typing import Any, Dict, Optional, Union
+
+import numpy as np
+import torch
+
+from ..utils import ext_loader
+
+ext_module = ext_loader.load_ext('_ext', ['bias_act'])
+
+
+class EasyDict(dict):
+    """Convenience class that behaves like a dict but allows access with the
+    attribute syntax."""
+
+    def __getattr__(self, name: str) -> Any:
+        try:
+            return self[name]
+        except KeyError:
+            raise AttributeError(name)
+
+    def __setattr__(self, name: str, value: Any) -> None:
+        self[name] = value
+
+    def __delattr__(self, name: str) -> None:
+        del self[name]
+
+
+activation_funcs = {
+    'linear':
+    EasyDict(
+        func=lambda x, **_: x,
+        def_alpha=0,
+        def_gain=1,
+        cuda_idx=1,
+        ref='',
+        has_2nd_grad=False),
+    'relu':
+    EasyDict(
+        func=lambda x, **_: torch.nn.functional.relu(x),
+        def_alpha=0,
+        def_gain=np.sqrt(2),
+        cuda_idx=2,
+        ref='y',
+        has_2nd_grad=False),
+    'lrelu':
+    EasyDict(
+        func=lambda x, alpha, **_: torch.nn.functional.leaky_relu(x, alpha),
+        def_alpha=0.2,
+        def_gain=np.sqrt(2),
+        cuda_idx=3,
+        ref='y',
+        has_2nd_grad=False),
+    'tanh':
+    EasyDict(
+        func=lambda x, **_: torch.tanh(x),
+        def_alpha=0,
+        def_gain=1,
+        cuda_idx=4,
+        ref='y',
+        has_2nd_grad=True),
+    'sigmoid':
+    EasyDict(
+        func=lambda x, **_: torch.sigmoid(x),
+        def_alpha=0,
+        def_gain=1,
+        cuda_idx=5,
+        ref='y',
+        has_2nd_grad=True),
+    'elu':
+    EasyDict(
+        func=lambda x, **_: torch.nn.functional.elu(x),
+        def_alpha=0,
+        def_gain=1,
+        cuda_idx=6,
+        ref='y',
+        has_2nd_grad=True),
+    'selu':
+    EasyDict(
+        func=lambda x, **_: torch.nn.functional.selu(x),
+        def_alpha=0,
+        def_gain=1,
+        cuda_idx=7,
+        ref='y',
+        has_2nd_grad=True),
+    'softplus':
+    EasyDict(
+        func=lambda x, **_: torch.nn.functional.softplus(x),
+        def_alpha=0,
+        def_gain=1,
+        cuda_idx=8,
+        ref='y',
+        has_2nd_grad=True),
+    'swish':
+    EasyDict(
+        func=lambda x, **_: torch.sigmoid(x) * x,
+        def_alpha=0,
+        def_gain=np.sqrt(2),
+        cuda_idx=9,
+        ref='x',
+        has_2nd_grad=True),
+}
+
+_null_tensor = torch.empty([0])
+
+
+def bias_act(input: torch.Tensor,
+             bias: Optional[torch.Tensor] = None,
+             dim: int = 1,
+             act: str = 'linear',
+             alpha: Optional[Union[float, int]] = None,
+             gain: Optional[float] = None,
+             clamp: Optional[float] = None,
+             use_custom_op: bool = True):
+    r"""Fused bias and activation function.
+
+    Adds `bias` to activation tensor `input`, and evaluates activation
+    function `act`, and scales the result by `gain`. Each of the steps is
+    optional.
+
+    In most cases, the fused op is considerably more efficient than performing
+    the same calculation using standard PyTorch ops. It supports first and
+    second order gradients, but not third order gradients.
+
+    Args:
+        input (torch.Tensor): Input activation tensor. Can be of any shape.
+        bias (torch.Tensor): Bias vector, or `None` to disable.
+            Must be a 1D tensor of the same type as `input`. The shape must
+            be known, and it must match the dimension of `input` corresponding
+            to `dim`. Defaults to None.
+        dim (int): The dimension in `input` corresponding to the elements of
+            `bias`. The value of `dim` is ignored if `b` is not specified.
+            Defaults to 1.
+        act (str): Name of the activation function to evaluate, or `"linear"`
+            to disable. Can be e.g. "relu", "lrelu", "tanh", "sigmoid",
+            "swish", etc. See `activation_funcs` for a full list. `None` is not
+            allowed. Defaults to `linear`.
+        alpha (float or int): Shape parameter for the activation
+            function, or `None` to use the default. Defaults to None.
+        gain (float): Scaling factor for the output tensor, or `None`
+            to use default. See `activation_funcs` for the default scaling of
+            each activation function. If unsure, consider specifying 1.
+            Defaults to None.
+        clamp (float):  Clamp the output values to `[-clamp, +clamp]`,
+            or `None` to disable the clamping (default). Defaults to None.
+        use_custom_op (bool): Whether to use customized op.
+            Defaults to True.
+
+    Returns:
+        torch.Tensor: Tensor of the same shape and datatype as `input`.
+    """
+    assert isinstance(input, torch.Tensor)
+    if use_custom_op and input.is_cuda:
+        return _bias_act_cuda(
+            dim=dim, act=act, alpha=alpha, gain=gain,
+            clamp=clamp).apply(input, bias)
+    return _bias_act_ref(
+        input=input,
+        bias=bias,
+        dim=dim,
+        act=act,
+        alpha=alpha,
+        gain=gain,
+        clamp=clamp)
+
+
+def _bias_act_ref(input: torch.Tensor,
+                  bias: Optional[torch.Tensor] = None,
+                  dim: int = 1,
+                  act: str = 'linear',
+                  alpha: Optional[Union[float, int]] = None,
+                  gain: Optional[float] = None,
+                  clamp: Optional[float] = None):
+    """Slow reference implementation of `bias_act()` using standard PyTorch
+    ops.
+
+    Adds `bias` to activation tensor `input`, and evaluates activation
+    function `act`, and scales the result by `gain`. Each of the steps is
+    optional.
+
+    In most cases, the fused op is considerably more efficient than performing
+    the same calculation using standard PyTorch ops. It supports first and
+    second order gradients, but not third order gradients.
+
+    Args:
+        input (torch.Tensor): Input activation tensor. Can be of any shape.
+        bias (torch.Tensor): Bias vector, or `None` to disable.
+            Must be a 1D tensor of the same type as `input`. The shape must
+            be known, and it must match the dimension of `input` corresponding
+            to `dim`. Defaults to None.
+        dim (int): The dimension in `input` corresponding to the elements of
+            `bias`. The value of `dim` is ignored if `b` is not specified.
+            Defaults to 1.
+        act (str): Name of the activation function to evaluate, or `"linear"`
+            to disable. Can be e.g. "relu", "lrelu", "tanh", "sigmoid",
+            "swish", etc. See `activation_funcs` for a full list. `None` is not
+            allowed. Defaults to `linear`.
+        alpha (float or int): Shape parameter for the activation
+            function, or `None` to use the default. Defaults to None.
+        gain (float): Scaling factor for the output tensor, or `None`
+            to use default. See `activation_funcs` for the default scaling of
+            each activation function. If unsure, consider specifying 1.
+            Defaults to None.
+        clamp (float):  Clamp the output values to
+            `[-clamp, +clamp]`, or `None` to disable the clamping (default).
+            Defaults to None.
+
+    Returns:
+        torch.Tensor: Tensor of the same shape and datatype as `input`.
+    """
+    assert isinstance(input, torch.Tensor)
+    assert clamp is None or clamp >= 0
+    spec = activation_funcs[act]
+    alpha = float(alpha if alpha is not None else spec.def_alpha)
+    gain = float(gain if gain is not None else spec.def_gain)
+    clamp = float(clamp if clamp is not None else -1)
+
+    # Add bias.
+    if bias is not None:
+        assert isinstance(bias, torch.Tensor) and bias.ndim == 1
+        assert 0 <= dim < input.ndim
+        assert bias.shape[0] == input.shape[dim]
+        input = input + bias.reshape(
+            [-1 if i == dim else 1 for i in range(input.ndim)])
+
+    # Evaluate activation function.
+    alpha = float(alpha)
+    output = spec.func(input, alpha=alpha)
+
+    # Scale by gain.
+    gain = float(gain)
+    if gain != 1:
+        output = output * gain
+
+    # Clamp.
+    if clamp >= 0:
+        # pylint: disable=invalid-unary-operand-type
+        output = output.clamp(-clamp, clamp)
+    return output
+
+
+_bias_act_cuda_cache: Dict = dict()
+
+
+def _bias_act_cuda(dim: int = 1,
+                   act: str = 'linear',
+                   alpha: Optional[Union[float, int]] = None,
+                   gain: Optional[float] = None,
+                   clamp: Optional[float] = None):
+    """"Fast CUDA implementation of `bias_act()` using custom ops.
+
+    Args:
+        dim (int): The dimension in `x` corresponding to the elements of `b`.
+            The value of `dim` is ignored if `b` is not specified.
+            Defaults to 1.
+        act (str): Name of the activation function to evaluate, or `"linear"`
+            to disable. Can be e.g. "relu", "lrelu", "tanh", "sigmoid",
+            "swish", etc. See `activation_funcs` for a full list. `None` is not
+            allowed. Defaults to `linear`.
+        alpha (float | int): Shape parameter for the activation
+            function, or `None` to use the default. Defaults to None.
+        gain (float): Scaling factor for the output tensor, or `None`
+            to use default. See `activation_funcs` for the default scaling of
+            each activation function. If unsure, consider specifying 1.
+            Defaults to None.
+        clamp (float): Clamp the output values to `[-clamp, +clamp]`,
+            or `None` to disable the clamping (default). Defaults to None.
+
+    Returns:
+        torch.Tensor: Tensor of the same shape and datatype as `x`.
+    """
+    # Parse arguments.
+    assert clamp is None or clamp >= 0
+    spec = activation_funcs[act]
+    alpha = float(alpha if alpha is not None else spec.def_alpha)
+    gain = float(gain if gain is not None else spec.def_gain)
+    clamp = float(clamp if clamp is not None else -1)
+
+    # Lookup from cache.
+    key = (dim, act, alpha, gain, clamp)
+    if key in _bias_act_cuda_cache:
+        return _bias_act_cuda_cache[key]
+
+    # Forward op.
+    class BiasActCuda(torch.autograd.Function):
+
+        @staticmethod
+        def forward(ctx, x, b):  # pylint: disable=arguments-differ
+            ctx.memory_format = torch.channels_last if x.ndim > 2 and x.stride(
+                1) == 1 else torch.contiguous_format
+            x = x.contiguous(memory_format=ctx.memory_format)
+            b = b.contiguous() if b is not None else _null_tensor.to(x.device)
+            y = x
+            if act != 'linear' or gain != 1 or clamp >= 0 or (
+                    b is not _null_tensor.to(x.device)):
+                y = ext_module.bias_act(x, b, _null_tensor.to(x.device),
+                                        _null_tensor.to(x.device),
+                                        _null_tensor.to(x.device), 0, dim,
+                                        spec.cuda_idx, alpha, gain, clamp)
+            ctx.save_for_backward(
+                x if 'x' in spec.ref or spec.has_2nd_grad else _null_tensor.to(
+                    x.device), b if 'x' in spec.ref or spec.has_2nd_grad else
+                _null_tensor.to(x.device),
+                y if 'y' in spec.ref else _null_tensor.to(x.device))
+            return y
+
+        @staticmethod
+        def backward(ctx, dy):  # pylint: disable=arguments-differ
+            dy = dy.contiguous(memory_format=ctx.memory_format)
+            x, b, y = ctx.saved_tensors
+            dx = None
+            db = None
+
+            if ctx.needs_input_grad[0] or ctx.needs_input_grad[1]:
+                dx = dy
+                if act != 'linear' or gain != 1 or clamp >= 0:
+                    dx = BiasActCudaGrad.apply(dy, x, b, y)
+
+            if ctx.needs_input_grad[1]:
+                db = dx.sum([i for i in range(dx.ndim) if i != dim])
+
+            return dx, db
+
+    # Backward op.
+    class BiasActCudaGrad(torch.autograd.Function):
+
+        @staticmethod
+        def forward(ctx, dy, x, b, y):  # pylint: disable=arguments-differ
+            ctx.memory_format = torch.channels_last if dy.ndim > 2 and (
+                dy.stride(1) == 1) else torch.contiguous_format
+            dx = ext_module.bias_act(dy, b, x, y, _null_tensor.to(x.device), 1,
+                                     dim, spec.cuda_idx, alpha, gain, clamp)
+            ctx.save_for_backward(
+                dy if spec.has_2nd_grad else _null_tensor.to(x.device), x, b,
+                y)
+            return dx
+
+        @staticmethod
+        def backward(ctx, d_dx):  # pylint: disable=arguments-differ
+            d_dx = d_dx.contiguous(memory_format=ctx.memory_format)
+            dy, x, b, y = ctx.saved_tensors
+            d_dy = None
+            d_x = None
+            d_b = None
+            d_y = None
+
+            if ctx.needs_input_grad[0]:
+                d_dy = BiasActCudaGrad.apply(d_dx, x, b, y)
+
+            if spec.has_2nd_grad and (ctx.needs_input_grad[1]
+                                      or ctx.needs_input_grad[2]):
+                d_x = ext_module.bias_act(d_dx, b, x, y, dy, 2, dim,
+                                          spec.cuda_idx, alpha, gain, clamp)
+
+            if spec.has_2nd_grad and ctx.needs_input_grad[2]:
+                d_b = d_x.sum([i for i in range(d_x.ndim) if i != dim])
+
+            return d_dy, d_x, d_b, d_y
+
+    # Add to cache.
+    _bias_act_cuda_cache[key] = BiasActCuda
+    return BiasActCuda

mmcv/ops/conv2d_gradfix.py

+# Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+#
+# NVIDIA CORPORATION and its licensors retain all intellectual property
+# and proprietary rights in and to this software, related documentation
+# and any modifications thereto.  Any use, reproduction, disclosure or
+# distribution of this software and related documentation without an express
+# license agreement from NVIDIA CORPORATION is strictly prohibited.
+
+# source: https://github.com/NVlabs/stylegan3/blob/main/torch_utils/ops/conv2d_gradfix.py # noqa
+"""Custom replacement for `torch.nn.functional.conv2d` that supports
+arbitrarily high order gradients with zero performance penalty."""
+
+import contextlib
+import warnings
+from typing import Dict, Optional, Tuple, Union
+
+import torch
+
+enabled = True
+weight_gradients_disabled = False
+
+
+@contextlib.contextmanager
+def no_weight_gradients(disable=True):
+    global weight_gradients_disabled
+    old = weight_gradients_disabled
+    if disable:
+        weight_gradients_disabled = True
+    yield
+    weight_gradients_disabled = old
+
+
+def conv2d(input: torch.Tensor,
+           weight: torch.Tensor,
+           bias: Optional[torch.Tensor] = None,
+           stride: Union[int, Tuple[int, ...]] = 1,
+           padding: Union[int, Tuple[int, ...]] = 0,
+           dilation: Union[int, Tuple[int, ...]] = 1,
+           groups: int = 1):
+    flag = True
+    if torch.__version__ >= '1.10.0':
+        warnings.warn('Since '
+                      'aten:cudnn_convolution_backward_weight is '
+                      f'not supported in torch=={torch.__version__},'
+                      ' rolling back to `torch.nn.functional.conv2d`')
+        flag = False
+    if _should_use_custom_op(input) and flag:
+        return _conv2d_gradfix(
+            transpose=False,
+            weight_shape=weight.shape,
+            stride=stride,
+            padding=padding,
+            output_padding=0,
+            dilation=dilation,
+            groups=groups).apply(input, weight, bias)
+    return torch.nn.functional.conv2d(
+        input=input,
+        weight=weight,
+        bias=bias,
+        stride=stride,
+        padding=padding,
+        dilation=dilation,
+        groups=groups)
+
+
+def conv_transpose2d(input: torch.Tensor,
+                     weight: torch.Tensor,
+                     bias: Optional[torch.Tensor] = None,
+                     stride: Union[int, Tuple[int, ...]] = 1,
+                     padding: Union[int, Tuple[int, ...]] = 0,
+                     output_padding: Union[int, Tuple[int, ...]] = 0,
+                     groups: int = 1,
+                     dilation: Union[int, Tuple[int, ...]] = 1):
+    if _should_use_custom_op(input):
+        return _conv2d_gradfix(
+            transpose=True,
+            weight_shape=weight.shape,
+            stride=stride,
+            padding=padding,
+            output_padding=output_padding,
+            groups=groups,
+            dilation=dilation).apply(input, weight, bias)
+    return torch.nn.functional.conv_transpose2d(
+        input=input,
+        weight=weight,
+        bias=bias,
+        stride=stride,
+        padding=padding,
+        output_padding=output_padding,
+        groups=groups,
+        dilation=dilation)
+
+
+def _should_use_custom_op(input):
+    assert isinstance(input, torch.Tensor)
+    if (not enabled) or (not torch.backends.cudnn.enabled):
+        return False
+    if input.device.type != 'cuda':
+        return False
+    return True
+
+
+def _to_tuple(x, ndim):
+    xs = tuple(x) if isinstance(x, (tuple, list)) else (x, ) * ndim
+    assert len(xs) == ndim
+    assert all(isinstance(x, int) for x in xs)
+    return xs
+
+
+_conv2d_gradfix_cache: Dict = dict()
+_null_tensor = torch.empty([0])
+
+
+def _conv2d_gradfix(
+    transpose: bool,
+    weight_shape: Tuple[int, ...],
+    stride: Union[int, Tuple[int, ...]],
+    padding: Union[int, Tuple[int, ...]],
+    output_padding: Union[int, Tuple[int, ...]],
+    dilation: Union[int, Tuple[int, ...]],
+    groups: int,
+):
+    # Parse arguments.
+    ndim = 2
+    weight_shape = tuple(weight_shape)
+    stride = _to_tuple(stride, ndim)
+    padding = _to_tuple(padding, ndim)
+    output_padding = _to_tuple(output_padding, ndim)
+    dilation = _to_tuple(dilation, ndim)
+
+    # Lookup from cache.
+    key = (transpose, weight_shape, stride, padding, output_padding, dilation,
+           groups)
+    if key in _conv2d_gradfix_cache:
+        return _conv2d_gradfix_cache[key]
+
+    # Validate arguments.
+
+    assert groups >= 1
+    assert len(weight_shape) == ndim + 2
+    assert all(stride[i] >= 1 for i in range(ndim))  # type: ignore
+    assert all(padding[i] >= 0 for i in range(ndim))  # type: ignore
+    assert all(dilation[i] >= 0 for i in range(ndim))  # type: ignore
+    if not transpose:
+        assert all(output_padding[i] == 0 for i in range(ndim))  # type: ignore
+    else:  # transpose
+        for i in range(ndim):
+            assert 0 <= output_padding[i] < max(  # type: ignore
+                stride[i],  # type: ignore
+                dilation[i])  # type: ignore
+
+    # Helpers.
+    common_kwargs = dict(
+        stride=stride, padding=padding, dilation=dilation, groups=groups)
+
+    def calc_output_padding(input_shape, output_shape):
+        if transpose:
+            return [0, 0]
+        return [
+            input_shape[i + 2] - (output_shape[i + 2] - 1) * stride[i] -
+            (1 - 2 * padding[i]) - dilation[i] * (weight_shape[i + 2] - 1)
+            for i in range(ndim)
+        ]
+
+    # Forward & backward.
+    class Conv2d(torch.autograd.Function):
+
+        @staticmethod
+        def forward(ctx, input, weight, bias):
+            assert weight.shape == weight_shape
+            ctx.save_for_backward(
+                input if weight.requires_grad else _null_tensor,
+                weight if input.requires_grad else _null_tensor,
+            )
+            ctx.input_shape = input.shape
+
+            # Simple 1x1 convolution => cuBLAS (only on Volta, not on Ampere).
+            if weight_shape[2:] == stride == dilation == (
+                    1, 1) and padding == (
+                        0, 0) and torch.cuda.get_device_capability(
+                            input.device) < (8, 0):
+                a = weight.reshape(groups, weight_shape[0] // groups,
+                                   weight_shape[1])
+                b = input.reshape(input.shape[0], groups,
+                                  input.shape[1] // groups, -1)
+                c = (a.transpose(1, 2) if transpose else a) @ b.permute(
+                    1, 2, 0, 3).flatten(2)
+                c = c.reshape(-1, input.shape[0],
+                              *input.shape[2:]).transpose(0, 1)
+                c = c if bias is None else c + bias.unsqueeze(0).unsqueeze(
+                    2).unsqueeze(3)
+                return c.contiguous(
+                    memory_format=(torch.channels_last if input.stride(1) ==
+                                   1 else torch.contiguous_format))
+
+            # General case => cuDNN.
+            if transpose:
+                return torch.nn.functional.conv_transpose2d(
+                    input=input,
+                    weight=weight,
+                    bias=bias,
+                    output_padding=output_padding,
+                    **common_kwargs)
+            return torch.nn.functional.conv2d(
+                input=input, weight=weight, bias=bias, **common_kwargs)
+
+        @staticmethod
+        def backward(ctx, grad_output):
+            input, weight = ctx.saved_tensors
+            input_shape = ctx.input_shape
+            grad_input = None
+            grad_weight = None
+            grad_bias = None
+
+            if ctx.needs_input_grad[0]:
+                p = calc_output_padding(
+                    input_shape=input_shape, output_shape=grad_output.shape)
+                op = _conv2d_gradfix(
+                    transpose=(not transpose),
+                    weight_shape=weight_shape,
+                    output_padding=p,
+                    **common_kwargs)
+                grad_input = op.apply(grad_output, weight, None)
+                assert grad_input.shape == input_shape
+
+            if ctx.needs_input_grad[1] and not weight_gradients_disabled:
+                grad_weight = Conv2dGradWeight.apply(grad_output, input)
+                assert grad_weight.shape == weight_shape
+
+            if ctx.needs_input_grad[2]:
+                grad_bias = grad_output.sum([0, 2, 3])
+
+            return grad_input, grad_weight, grad_bias
+
+    # Gradient with respect to the weights.
+    class Conv2dGradWeight(torch.autograd.Function):
+
+        @staticmethod
+        def forward(ctx, grad_output, input):
+            ctx.save_for_backward(
+                grad_output if input.requires_grad else _null_tensor,
+                input if grad_output.requires_grad else _null_tensor,
+            )
+            ctx.grad_output_shape = grad_output.shape
+            ctx.input_shape = input.shape
+
+            # Simple 1x1 convolution => cuBLAS (on both Volta and Ampere).
+            if weight_shape[2:] == stride == dilation == (
+                    1, 1) and padding == (0, 0):
+                a = grad_output.reshape(grad_output.shape[0], groups,
+                                        grad_output.shape[1] // groups,
+                                        -1).permute(1, 2, 0, 3).flatten(2)
+                b = input.reshape(input.shape[0], groups,
+                                  input.shape[1] // groups,
+                                  -1).permute(1, 2, 0, 3).flatten(2)
+                c = (b @ a.transpose(1, 2) if transpose else
+                     a @ b.transpose(1, 2)).reshape(weight_shape)
+                return c.contiguous(
+                    memory_format=(torch.channels_last if input.stride(1) ==
+                                   1 else torch.contiguous_format))
+
+            # General case => cuDNN.
+            name = ('aten::cudnn_convolution_transpose_backward_weight' if
+                    transpose else 'aten::cudnn_convolution_backward_weight')
+            flags = [
+                torch.backends.cudnn.benchmark,
+                torch.backends.cudnn.deterministic,
+                torch.backends.cudnn.allow_tf32
+            ]
+            return torch._C._jit_get_operation(name)(weight_shape, grad_output,
+                                                     input, padding, stride,
+                                                     dilation, groups, *flags)
+
+        @staticmethod
+        def backward(ctx, grad2_grad_weight):
+            grad_output, input = ctx.saved_tensors
+            grad_output_shape = ctx.grad_output_shape
+            input_shape = ctx.input_shape
+            grad2_grad_output = None
+            grad2_input = None
+
+            if ctx.needs_input_grad[0]:
+                grad2_grad_output = Conv2d.apply(input, grad2_grad_weight,
+                                                 None)
+                assert grad2_grad_output.shape == grad_output_shape
+
+            if ctx.needs_input_grad[1]:
+                p = calc_output_padding(
+                    input_shape=input_shape, output_shape=grad_output_shape)
+                op = _conv2d_gradfix(
+                    transpose=(not transpose),
+                    weight_shape=weight_shape,
+                    output_padding=p,
+                    **common_kwargs)
+                grad2_input = op.apply(grad_output, grad2_grad_weight, None)
+                assert grad2_input.shape == input_shape
+
+            return grad2_grad_output, grad2_input
+
+    _conv2d_gradfix_cache[key] = Conv2d
+    return Conv2d

mmcv/ops/csrc/pytorch/bias_act.cpp

+#include "pytorch_cpp_helper.hpp"
+#include "pytorch_device_registry.hpp"
+
+torch::Tensor bias_act_op_impl(const torch::Tensor &input,
+                               const torch::Tensor &bias,
+                               const torch::Tensor &xref,
+                               const torch::Tensor &yref,
+                               const torch::Tensor &dy, int grad, int dim,
+                               int act, float alpha, float gain, float clamp) {
+  return DISPATCH_DEVICE_IMPL(bias_act_op_impl, input, bias, xref, yref, dy,
+                              grad, dim, act, alpha, gain, clamp);
+}
+
+torch::Tensor bias_act(const torch::Tensor &input, const torch::Tensor &bias,
+                       const torch::Tensor &xref, const torch::Tensor &yref,
+                       const torch::Tensor &dy, int grad, int dim, int act,
+                       float alpha, float gain, float clamp) {
+  return bias_act_op_impl(input, bias, xref, yref, dy, grad, dim, act, alpha,
+                          gain, clamp);
+}

mmcv/ops/csrc/pytorch/cuda/bias_act_cuda.cu

+// Modified from
+// https://github.com/NVlabs/stylegan3/blob/main/torch_utils/ops/bias_act.cpp
+
+// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+//
+// NVIDIA CORPORATION and its licensors retain all intellectual property
+// and proprietary rights in and to this software, related documentation
+// and any modifications thereto.  Any use, reproduction, disclosure or
+// distribution of this software and related documentation without an express
+// license agreement from NVIDIA CORPORATION is strictly prohibited.
+
+#include <c10/util/Half.h>
+#include <cuda_runtime.h>
+#include <torch/extension.h>
+
+#include "pytorch_cuda_helper.hpp"
+
+struct bias_act_kernel_params {
+  const void* x;     // [sizeX]
+  const void* b;     // [sizeB] or NULL
+  const void* xref;  // [sizeX] or NULL
+  const void* yref;  // [sizeX] or NULL
+  const void* dy;    // [sizeX] or NULL
+  void* y;           // [sizeX]
+
+  int grad;
+  int act;
+  float alpha;
+  float gain;
+  float clamp;
+
+  int sizeX;
+  int sizeB;
+  int stepB;
+  int loopX;
+};
+
+// CUDA kernel selection.
+
+template <class T>
+void* choose_bias_act_kernel(const bias_act_kernel_params& p);
+//------------------------------------------------------------------------
+// Helpers.
+
+template <class T>
+struct InternalType;
+template <>
+struct InternalType<double> {
+  typedef double scalar_t;
+};
+template <>
+struct InternalType<float> {
+  typedef float scalar_t;
+};
+template <>
+struct InternalType<c10::Half> {
+  typedef float scalar_t;
+};
+
+//------------------------------------------------------------------------
+// CUDA kernel.
+
+template <class T, int A>
+__global__ void bias_act_kernel(bias_act_kernel_params p) {
+  typedef typename InternalType<T>::scalar_t scalar_t;
+  int G = p.grad;
+  scalar_t alpha = (scalar_t)p.alpha;
+  scalar_t gain = (scalar_t)p.gain;
+  scalar_t clamp = (scalar_t)p.clamp;
+  scalar_t one = (scalar_t)1;
+  scalar_t two = (scalar_t)2;
+  scalar_t expRange = (scalar_t)80;
+  scalar_t halfExpRange = (scalar_t)40;
+  scalar_t seluScale = (scalar_t)1.0507009873554804934193349852946;
+  scalar_t seluAlpha = (scalar_t)1.6732632423543772848170429916717;
+
+  // Loop over elements.
+  int xi = blockIdx.x * p.loopX * blockDim.x + threadIdx.x;
+  for (int loopIdx = 0; loopIdx < p.loopX && xi < p.sizeX;
+       loopIdx++, xi += blockDim.x) {
+    // Load.
+    scalar_t x = (scalar_t)((const T*)p.x)[xi];
+    scalar_t b =
+        (p.b) ? (scalar_t)((const T*)p.b)[(xi / p.stepB) % p.sizeB] : 0;
+    scalar_t xref = (p.xref) ? (scalar_t)((const T*)p.xref)[xi] : 0;
+    scalar_t yref = (p.yref) ? (scalar_t)((const T*)p.yref)[xi] : 0;
+    scalar_t dy = (p.dy) ? (scalar_t)((const T*)p.dy)[xi] : one;
+    scalar_t yy = (gain != 0) ? yref / gain : 0;
+    scalar_t y = 0;
+
+    // Apply bias.
+    ((G == 0) ? x : xref) += b;
+
+    // linear
+    if (A == 1) {
+      if (G == 0) y = x;
+      if (G == 1) y = x;
+    }
+
+    // relu
+    if (A == 2) {
+      if (G == 0) y = (x > 0) ? x : 0;
+      if (G == 1) y = (yy > 0) ? x : 0;
+    }
+
+    // lrelu
+    if (A == 3) {
+      if (G == 0) y = (x > 0) ? x : x * alpha;
+      if (G == 1) y = (yy > 0) ? x : x * alpha;
+    }
+
+    // tanh
+    if (A == 4) {
+      if (G == 0) {
+        scalar_t c = exp(x);
+        scalar_t d = one / c;
+        y = (x < -expRange) ? -one : (x > expRange) ? one : (c - d) / (c + d);
+      }
+      if (G == 1) y = x * (one - yy * yy);
+      if (G == 2) y = x * (one - yy * yy) * (-two * yy);
+    }
+
+    // sigmoid
+    if (A == 5) {
+      if (G == 0) y = (x < -expRange) ? 0 : one / (exp(-x) + one);
+      if (G == 1) y = x * yy * (one - yy);
+      if (G == 2) y = x * yy * (one - yy) * (one - two * yy);
+    }
+
+    // elu
+    if (A == 6) {
+      if (G == 0) y = (x >= 0) ? x : exp(x) - one;
+      if (G == 1) y = (yy >= 0) ? x : x * (yy + one);
+      if (G == 2) y = (yy >= 0) ? 0 : x * (yy + one);
+    }
+
+    // selu
+    if (A == 7) {
+      if (G == 0)
+        y = (x >= 0) ? seluScale * x : (seluScale * seluAlpha) * (exp(x) - one);
+      if (G == 1)
+        y = (yy >= 0) ? x * seluScale : x * (yy + seluScale * seluAlpha);
+      if (G == 2) y = (yy >= 0) ? 0 : x * (yy + seluScale * seluAlpha);
+    }
+
+    // softplus
+    if (A == 8) {
+      if (G == 0) y = (x > expRange) ? x : log(exp(x) + one);
+      if (G == 1) y = x * (one - exp(-yy));
+      if (G == 2) {
+        scalar_t c = exp(-yy);
+        y = x * c * (one - c);
+      }
+    }
+
+    // swish
+    if (A == 9) {
+      if (G == 0)
+        y = (x < -expRange) ? 0 : x / (exp(-x) + one);
+      else {
+        scalar_t c = exp(xref);
+        scalar_t d = c + one;
+        if (G == 1)
+          y = (xref > halfExpRange) ? x : x * c * (xref + d) / (d * d);
+        else
+          y = (xref > halfExpRange)
+                  ? 0
+                  : x * c * (xref * (two - d) + two * d) / (d * d * d);
+        yref = (xref < -expRange) ? 0 : xref / (exp(-xref) + one) * gain;
+      }
+    }
+
+    // Apply gain.
+    y *= gain * dy;
+
+    // Clamp.
+    if (clamp >= 0) {
+      if (G == 0)
+        y = (y > -clamp & y < clamp) ? y : (y >= 0) ? clamp : -clamp;
+      else
+        y = (yref > -clamp & yref < clamp) ? y : 0;
+    }
+
+    // Store.
+    ((T*)p.y)[xi] = (T)y;
+  }
+}
+
+//------------------------------------------------------------------------
+// CUDA kernel selection.
+
+template <class T>
+void* choose_bias_act_kernel(const bias_act_kernel_params& p) {
+  if (p.act == 1) return (void*)bias_act_kernel<T, 1>;
+  if (p.act == 2) return (void*)bias_act_kernel<T, 2>;
+  if (p.act == 3) return (void*)bias_act_kernel<T, 3>;
+  if (p.act == 4) return (void*)bias_act_kernel<T, 4>;
+  if (p.act == 5) return (void*)bias_act_kernel<T, 5>;
+  if (p.act == 6) return (void*)bias_act_kernel<T, 6>;
+  if (p.act == 7) return (void*)bias_act_kernel<T, 7>;
+  if (p.act == 8) return (void*)bias_act_kernel<T, 8>;
+  if (p.act == 9) return (void*)bias_act_kernel<T, 9>;
+  return NULL;
+}
+
+//------------------------------------------------------------------------
+
+static bool has_same_layout(torch::Tensor x, torch::Tensor y) {
+  if (x.dim() != y.dim()) return false;
+  for (int64_t i = 0; i < x.dim(); i++) {
+    if (x.size(i) != y.size(i)) return false;
+    if (x.size(i) >= 2 && x.stride(i) != y.stride(i)) return false;
+  }
+  return true;
+}
+
+//------------------------------------------------------------------------
+torch::Tensor bias_act_op(const torch::Tensor& x, const torch::Tensor& b,
+                          const torch::Tensor& xref, const torch::Tensor& yref,
+                          const torch::Tensor& dy, int grad, int dim, int act,
+                          float alpha, float gain, float clamp) {
+  // Validate arguments.
+  TORCH_CHECK(x.is_cuda(), "x must reside on CUDA device");
+  TORCH_CHECK(
+      b.numel() == 0 || (b.dtype() == x.dtype() && b.device() == x.device()),
+      "b must have the same dtype and device as x");
+  TORCH_CHECK(xref.numel() == 0 ||
+                  (xref.sizes() == x.sizes() && xref.dtype() == x.dtype() &&
+                   xref.device() == x.device()),
+              "xref must have the same shape, dtype, and device as x");
+  TORCH_CHECK(yref.numel() == 0 ||
+                  (yref.sizes() == x.sizes() && yref.dtype() == x.dtype() &&
+                   yref.device() == x.device()),
+              "yref must have the same shape, dtype, and device as x");
+  TORCH_CHECK(
+      dy.numel() == 0 || (dy.sizes() == x.sizes() && dy.dtype() == x.dtype() &&
+                          dy.device() == x.device()),
+      "dy must have the same dtype and device as x");
+  TORCH_CHECK(x.numel() <= INT_MAX, "x is too large");
+  TORCH_CHECK(b.dim() == 1, "b must have rank 1");
+  TORCH_CHECK(b.numel() == 0 || (dim >= 0 && dim < x.dim()),
+              "dim is out of bounds");
+  TORCH_CHECK(b.numel() == 0 || b.numel() == x.size(dim),
+              "b has wrong number of elements");
+  TORCH_CHECK(grad >= 0, "grad must be non-negative");
+
+  // Validate layout.
+  TORCH_CHECK(x.is_non_overlapping_and_dense(),
+              "x must be non-overlapping and dense");
+  TORCH_CHECK(b.is_contiguous(), "b must be contiguous");
+  TORCH_CHECK(xref.numel() == 0 || has_same_layout(xref, x),
+              "xref must have the same layout as x");
+  TORCH_CHECK(yref.numel() == 0 || has_same_layout(yref, x),
+              "yref must have the same layout as x");
+  TORCH_CHECK(dy.numel() == 0 || has_same_layout(dy, x),
+              "dy must have the same layout as x");
+
+  // Create output tensor.
+  const at::cuda::OptionalCUDAGuard device_guard(device_of(x));
+  torch::Tensor y = torch::empty_like(x);
+  TORCH_CHECK(has_same_layout(y, x), "y must have the same layout as x");
+
+  // Initialize CUDA kernel parameters.
+  bias_act_kernel_params p;
+  p.x = x.data_ptr();
+  p.b = (b.numel()) ? b.data_ptr() : NULL;
+  p.xref = (xref.numel()) ? xref.data_ptr() : NULL;
+  p.yref = (yref.numel()) ? yref.data_ptr() : NULL;
+  p.dy = (dy.numel()) ? dy.data_ptr() : NULL;
+  p.y = y.data_ptr();
+  p.grad = grad;
+  p.act = act;
+  p.alpha = alpha;
+  p.gain = gain;
+  p.clamp = clamp;
+  p.sizeX = (int)x.numel();
+  p.sizeB = (int)b.numel();
+  p.stepB = (b.numel()) ? (int)x.stride(dim) : 1;
+
+  // Choose CUDA kernel.
+  void* kernel;
+  AT_DISPATCH_FLOATING_TYPES_AND_HALF(x.scalar_type(), "upfirdn2d_cuda", [&] {
+    kernel = choose_bias_act_kernel<scalar_t>(p);
+  });
+  TORCH_CHECK(kernel, "no CUDA kernel found for the specified activation func");
+
+  // Launch CUDA kernel.
+  p.loopX = 4;
+  int blockSize = 4 * 32;
+  int gridSize = (p.sizeX - 1) / (p.loopX * blockSize) + 1;
+  void* args[] = {&p};
+  AT_CUDA_CHECK(cudaLaunchKernel(kernel, gridSize, blockSize, args, 0,
+                                 at::cuda::getCurrentCUDAStream()));
+  return y;
+}

mmcv/ops/csrc/pytorch/filtered_lrelu.cpp

+#include "pytorch_cpp_helper.hpp"
+#include "pytorch_device_registry.hpp"
+
+std::tuple<torch::Tensor, torch::Tensor, int> filtered_lrelu_op_impl(
+    torch::Tensor x, torch::Tensor fu, torch::Tensor fd, torch::Tensor b,
+    torch::Tensor si, int up, int down, int px0, int px1, int py0, int py1,
+    int sx, int sy, float gain, float slope, float clamp, bool flip_filters,
+    bool writeSigns) {
+  return DISPATCH_DEVICE_IMPL(filtered_lrelu_op_impl, x, fu, fd, b, si, up,
+                              down, px0, px1, py0, py1, sx, sy, gain, slope,
+                              clamp, flip_filters, writeSigns);
+}
+
+std::tuple<torch::Tensor, torch::Tensor, int> filtered_lrelu(
+    torch::Tensor x, torch::Tensor fu, torch::Tensor fd, torch::Tensor b,
+    torch::Tensor si, int up, int down, int px0, int px1, int py0, int py1,
+    int sx, int sy, float gain, float slope, float clamp, bool flip_filters,
+    bool writeSigns) {
+  return filtered_lrelu_op_impl(x, fu, fd, b, si, up, down, px0, px1, py0, py1,
+                                sx, sy, gain, slope, clamp, flip_filters,
+                                writeSigns);
+}
+
+torch::Tensor filtered_lrelu_act_op_impl(torch::Tensor x, torch::Tensor si,
+                                         int sx, int sy, float gain,
+                                         float slope, float clamp,
+                                         bool writeSigns) {
+  return DISPATCH_DEVICE_IMPL(filtered_lrelu_act_op_impl, x, si, sx, sy, gain,
+                              slope, clamp, writeSigns);
+}
+
+torch::Tensor filtered_lrelu_act_(torch::Tensor x, torch::Tensor si, int sx,
+                                  int sy, float gain, float slope, float clamp,
+                                  bool writeSigns) {
+  return filtered_lrelu_act_op_impl(x, si, sx, sy, gain, slope, clamp,
+                                    writeSigns);
+}

mmcv/ops/csrc/pytorch/pybind.cpp

@@ -312,9 +312,9 @@ Tensor nms_rotated(const Tensor dets, const Tensor scores, const Tensor order,
                    const Tensor dets_sorted, const Tensor labels,
                    const float iou_threshold, const int multi_label);
 
-Tensor upfirdn2d(const Tensor &input, const Tensor &kernel, int up_x, int up_y,
-                 int down_x, int down_y, int pad_x0, int pad_x1, int pad_y0,
-                 int pad_y1);
+Tensor upfirdn2d(torch::Tensor input, torch::Tensor filter, int upx, int upy,
+                 int downx, int downy, int padx0, int padx1, int pady0,
+                 int pady1, bool flip, float gain);
 
 Tensor fused_bias_leakyrelu(const Tensor &input, const Tensor &bias,
                             const Tensor &refer, int act, int grad, float alpha,
@@ -439,6 +439,20 @@ void chamfer_distance_backward(const Tensor xyz1, const Tensor xyz2,
                                Tensor graddist2, Tensor gradxyz1,
                                Tensor gradxyz2);
 
+Tensor bias_act(const Tensor &input, const Tensor &bias, const Tensor &xref,
+                const Tensor &yref, const Tensor &dy, int grad, int dim,
+                int act, float alpha, float gain, float clamp);
+
+std::tuple<torch::Tensor, torch::Tensor, int> filtered_lrelu(
+    torch::Tensor x, torch::Tensor fu, torch::Tensor fd, torch::Tensor b,
+    torch::Tensor si, int up, int down, int px0, int px1, int py0, int py1,
+    int sx, int sy, float gain, float slope, float clamp, bool flip_filters,
+    bool writeSigns);
+
+torch::Tensor filtered_lrelu_act_(torch::Tensor x, torch::Tensor si, int sx,
+                                  int sy, float gain, float slope, float clamp,
+                                  bool writeSigns);
+
 void box_iou_quadri(const Tensor boxes1, const Tensor boxes2, Tensor ious,
                     const int mode_flag, const bool aligned);
 
@@ -458,9 +472,9 @@ void bezier_align_backward(Tensor grad_output, Tensor rois, Tensor grad_input,
 
 PYBIND11_MODULE(TORCH_EXTENSION_NAME, m) {
   m.def("upfirdn2d", &upfirdn2d, "upfirdn2d (CUDA)", py::arg("input"),
-        py::arg("kernel"), py::arg("up_x"), py::arg("up_y"), py::arg("down_x"),
-        py::arg("down_y"), py::arg("pad_x0"), py::arg("pad_x1"),
-        py::arg("pad_y0"), py::arg("pad_y1"));
+        py::arg("filter"), py::arg("upx"), py::arg("upy"), py::arg("downx"),
+        py::arg("downy"), py::arg("padx0"), py::arg("padx1"), py::arg("pady0"),
+        py::arg("pady1"), py::arg("flip"), py::arg("gain"));
   m.def("fused_bias_leakyrelu", &fused_bias_leakyrelu,
         "fused_bias_leakyrelu (CUDA)", py::arg("input"), py::arg("bias"),
         py::arg("empty"), py::arg("act"), py::arg("grad"), py::arg("alpha"),
@@ -902,6 +916,20 @@ PYBIND11_MODULE(TORCH_EXTENSION_NAME, m) {
         py::arg("input"), py::arg("rois"), py::arg("grad_rois"),
         py::arg("pooled_height"), py::arg("pooled_width"),
         py::arg("spatial_scale"));
+  m.def("bias_act", &bias_act, "bias_act (CUDA)", py::arg("input"),
+        py::arg("bias"), py::arg("xref"), py::arg("yref"), py::arg("dy"),
+        py::arg("grad"), py::arg("dim"), py::arg("act"), py::arg("alpha"),
+        py::arg("gain"), py::arg("clamp"));
+  m.def("filtered_lrelu", &filtered_lrelu, "filtered_lrelu (CUDA)",
+        py::arg("x"), py::arg("fu"), py::arg("fd"), py::arg("b"), py::arg("si"),
+        py::arg("up"), py::arg("down"), py::arg("px0"), py::arg("px1"),
+        py::arg("py0"), py::arg("py1"), py::arg("sx"), py::arg("sy"),
+        py::arg("gain"), py::arg("slope"), py::arg("clamp"),
+        py::arg("flip_filters"), py::arg("writeSigns"));
+  m.def("filtered_lrelu_act_", &filtered_lrelu_act_,
+        "filtered_lrelu_act_ (CUDA)", py::arg("x"), py::arg("si"),
+        py::arg("sx"), py::arg("sy"), py::arg("gain"), py::arg("slope"),
+        py::arg("clamp"), py::arg("writeSigns"));
   m.def("box_iou_quadri", &box_iou_quadri, "IoU for quadrilateral boxes",
         py::arg("boxes1"), py::arg("boxes2"), py::arg("ious"),
         py::arg("mode_flag"), py::arg("aligned"));

mmcv/ops/csrc/pytorch/upfirdn2d.cpp

@@ -102,17 +102,17 @@ THE POSSIBILITY OF SUCH DAMAGES.
 #include "pytorch_cpp_helper.hpp"
 #include "pytorch_device_registry.hpp"
 
-torch::Tensor upfirdn2d_op_impl(const torch::Tensor& input,
-                                const torch::Tensor& kernel, int up_x, int up_y,
-                                int down_x, int down_y, int pad_x0, int pad_x1,
-                                int pad_y0, int pad_y1) {
-  return DISPATCH_DEVICE_IMPL(upfirdn2d_op_impl, input, kernel, up_x, up_y,
-                              down_x, down_y, pad_x0, pad_x1, pad_y0, pad_y1);
+torch::Tensor upfirdn2d_op_impl(torch::Tensor input, torch::Tensor filter,
+                                int upx, int upy, int downx, int downy,
+                                int padx0, int padx1, int pady0, int pady1,
+                                bool flip, float gain) {
+  return DISPATCH_DEVICE_IMPL(upfirdn2d_op_impl, input, filter, upx, upy, downx,
+                              downy, padx0, padx1, pady0, pady1, flip, gain);
 }
 
-torch::Tensor upfirdn2d(const torch::Tensor& input, const torch::Tensor& kernel,
-                        int up_x, int up_y, int down_x, int down_y, int pad_x0,
-                        int pad_x1, int pad_y0, int pad_y1) {
-  return upfirdn2d_op_impl(input, kernel, up_x, up_y, down_x, down_y, pad_x0,
-                           pad_x1, pad_y0, pad_y1);
+torch::Tensor upfirdn2d(torch::Tensor input, torch::Tensor filter, int upx,
+                        int upy, int downx, int downy, int padx0, int padx1,
+                        int pady0, int pady1, bool flip, float gain) {
+  return upfirdn2d_op_impl(input, filter, upx, upy, downx, downy, padx0, padx1,
+                           pady0, pady1, flip, gain);
 }

tests/test_ops/test_bias_act.py

+# Copyright (c) OpenMMLab. All rights reserved.
+import pytest
+import torch
+
+from mmcv.ops import bias_act
+from mmcv.ops.bias_act import EasyDict
+
+_USING_PARROTS = True
+try:
+    from parrots.autograd import gradcheck
+except ImportError:
+    from torch.autograd import gradcheck, gradgradcheck
+    _USING_PARROTS = False
+
+
+class TestBiasAct:
+
+    @classmethod
+    def setup_class(cls):
+        cls.input_tensor = torch.randn((1, 3), requires_grad=True)
+        cls.bias = torch.randn(3, requires_grad=True)
+
+    def test_bias_act_cpu(self):
+        out = bias_act(self.input_tensor, self.bias)
+        assert out.shape == (1, 3)
+
+        # test with different dim
+        input_tensor = torch.randn((1, 1, 3), requires_grad=True)
+        bias = torch.randn(3, requires_grad=True)
+        out = bias_act(input_tensor, bias, dim=2)
+        assert out.shape == (1, 1, 3)
+
+        # test with different act
+        out = bias_act(self.input_tensor, self.bias, act='relu')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor, self.bias, act='lrelu')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor, self.bias, act='tanh')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor, self.bias, act='sigmoid')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor, self.bias, act='elu')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor, self.bias, act='selu')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor, self.bias, act='softplus')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor, self.bias, act='swish')
+        assert out.shape == (1, 3)
+
+        # test with different alpha
+        out = bias_act(self.input_tensor, self.bias, act='lrelu', alpha=0.1)
+        assert out.shape == (1, 3)
+
+        # test with different gain
+        out1 = bias_act(self.input_tensor, self.bias, act='lrelu', gain=0.2)
+        out2 = bias_act(self.input_tensor, self.bias, act='lrelu', gain=0.1)
+        assert torch.allclose(out1, out2 * 2)
+
+        # test with different clamp
+        out1 = bias_act(self.input_tensor, self.bias, act='lrelu', clamp=0.5)
+        out2 = bias_act(self.input_tensor, self.bias, act='lrelu', clamp=0.2)
+        assert out1.max() <= 0.5
+        assert out2.max() <= 0.5
+
+    @pytest.mark.skipif(not torch.cuda.is_available(), reason='requires cuda')
+    def test_bias_act_cuda(self):
+        if _USING_PARROTS:
+            gradcheck(
+                bias_act, (self.input_tensor.cuda(), self.bias.cuda()),
+                delta=1e-4,
+                pt_atol=1e-3)
+        else:
+            gradcheck(
+                bias_act, (self.input_tensor.cuda(), self.bias.cuda()),
+                eps=1e-4,
+                atol=1e-3)
+
+            gradgradcheck(
+                bias_act, (self.input_tensor.cuda(), self.bias.cuda()),
+                eps=1e-4,
+                atol=1e-3)
+
+        out = bias_act(self.input_tensor.cuda(), self.bias.cuda())
+        assert out.shape == (1, 3)
+
+        # test with different dim
+        input_tensor = torch.randn((1, 1, 3), requires_grad=True).cuda()
+        bias = torch.randn(3, requires_grad=True).cuda()
+        out = bias_act(input_tensor, bias, dim=2)
+        assert out.shape == (1, 1, 3)
+
+        # test with different act
+        out = bias_act(self.input_tensor.cuda(), self.bias.cuda(), act='relu')
+        assert out.shape == (1, 3)
+
+        out = bias_act(self.input_tensor.cuda(), self.bias.cuda(), act='lrelu')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor.cuda(), self.bias.cuda(), act='tanh')
+        assert out.shape == (1, 3)
+        out = bias_act(
+            self.input_tensor.cuda(), self.bias.cuda(), act='sigmoid')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor.cuda(), self.bias.cuda(), act='elu')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor.cuda(), self.bias.cuda(), act='selu')
+        assert out.shape == (1, 3)
+        out = bias_act(
+            self.input_tensor.cuda(), self.bias.cuda(), act='softplus')
+        assert out.shape == (1, 3)
+        out = bias_act(self.input_tensor.cuda(), self.bias.cuda(), act='swish')
+        assert out.shape == (1, 3)
+
+        # test with different alpha
+        out = bias_act(
+            self.input_tensor.cuda(), self.bias.cuda(), act='lrelu', alpha=0.1)
+        assert out.shape == (1, 3)
+
+        # test with different gain
+        out1 = bias_act(
+            self.input_tensor.cuda(), self.bias.cuda(), act='lrelu', gain=0.2)
+        out2 = bias_act(
+            self.input_tensor.cuda(), self.bias.cuda(), act='lrelu', gain=0.1)
+        assert torch.allclose(out1, out2 * 2)
+
+        # test with different clamp
+        out1 = bias_act(
+            self.input_tensor.cuda(), self.bias.cuda(), act='lrelu', clamp=0.5)
+        out2 = bias_act(
+            self.input_tensor.cuda(), self.bias.cuda(), act='lrelu', clamp=0.2)
+        assert out1.max() <= 0.5
+        assert out2.max() <= 0.5
+
+    def test_easy_dict(self):
+        easy_dict = EasyDict(
+            func=lambda x, **_: x,
+            def_alpha=0,
+            def_gain=1,
+            cuda_idx=1,
+            ref='',
+            has_2nd_grad=False)
+        _ = easy_dict.def_alpha
+        easy_dict.def_alpha = 1
+        del easy_dict.def_alpha

tests/test_ops/test_conv_gradfix.py

+# Copyright (c) OpenMMLab. All rights reserved.
+import pytest
+import torch
+import torch.nn as nn
+from torch.autograd import gradcheck, gradgradcheck
+
+from mmcv.ops import conv2d, conv_transpose2d
+
+
+class TestCond2d:
+
+    @classmethod
+    def setup_class(cls):
+        cls.input = torch.randn((1, 3, 32, 32), requires_grad=True)
+        cls.weight = nn.Parameter(torch.randn(1, 3, 3, 3))
+
+    @pytest.mark.skipif(not torch.cuda.is_available(), reason='requires cuda')
+    def test_conv2d_cuda(self):
+        x = self.input.cuda()
+        weight = self.weight.cuda()
+        res = conv2d(x, weight, None, 1, 1)
+        assert res.shape == (1, 1, 32, 32)
+        gradcheck(conv2d, (x, weight, None, 1, 1), eps=1e-2, atol=1e-2)
+        gradgradcheck(conv2d, (x, weight, None, 1, 1), eps=1e-2, atol=1e-2)
+
+
+class TestCond2dTansposed:
+
+    @classmethod
+    def setup_class(cls):
+        cls.input = torch.randn((1, 3, 32, 32), requires_grad=True)
+        cls.weight = nn.Parameter(torch.randn(3, 1, 3, 3))
+
+    @pytest.mark.skipif(not torch.cuda.is_available(), reason='requires cuda')
+    def test_conv2d_transposed_cuda(self):
+        x = self.input.cuda()
+        weight = self.weight.cuda()
+        res = conv_transpose2d(x, weight, None, 1, 1)
+        assert res.shape == (1, 1, 32, 32)
+        gradcheck(
+            conv_transpose2d, (x, weight, None, 1, 1), eps=1e-2, atol=1e-2)
+        gradgradcheck(
+            conv_transpose2d, (x, weight, None, 1, 1), eps=1e-2, atol=1e-2)

tests/test_ops/test_upfirdn2d.py

@@ -56,3 +56,29 @@ class TestUpFirDn2d:
                      self.input_tensor).cuda(), self.factor, 1, self.pad),
                 eps=1e-4,
                 atol=1e-3)
+
+        # test with different up
+        kernel = torch.randn(3, 3)
+        out = upfirdn2d(
+            self.input_tensor.cuda(), filter=kernel.cuda(), up=2, padding=1)
+        assert out.shape == (2, 3, 8, 8)
+
+        # test with different down
+        input_tensor = torch.randn(2, 3, 8, 8)
+        out = upfirdn2d(
+            input_tensor.cuda(), filter=self.kernel.cuda(), down=2, padding=1)
+        assert out.shape == (2, 3, 4, 4)
+
+        # test with different flip_filter
+        out = upfirdn2d(
+            self.input_tensor.cuda(),
+            filter=self.kernel.cuda(),
+            flip_filter=True)
+        assert out.shape == (2, 3, 1, 1)
+
+        # test with different gain
+        out1 = upfirdn2d(
+            self.input_tensor.cuda(), filter=self.kernel.cuda(), gain=0.2)
+        out2 = upfirdn2d(
+            self.input_tensor.cuda(), filter=self.kernel.cuda(), gain=0.1)
+        assert torch.allclose(out1, out2 * 2)