feat: add PPLCNetV2

ppcls/arch/backbone/__init__.py

@@ -22,6 +22,7 @@ from ppcls.arch.backbone.legendary_models.vgg import VGG11, VGG13, VGG16, VGG19
 from ppcls.arch.backbone.legendary_models.inception_v3 import InceptionV3
 from ppcls.arch.backbone.legendary_models.hrnet import HRNet_W18_C, HRNet_W30_C, HRNet_W32_C, HRNet_W40_C, HRNet_W44_C, HRNet_W48_C, HRNet_W60_C, HRNet_W64_C, SE_HRNet_W64_C
 from ppcls.arch.backbone.legendary_models.pp_lcnet import PPLCNet_x0_25, PPLCNet_x0_35, PPLCNet_x0_5, PPLCNet_x0_75, PPLCNet_x1_0, PPLCNet_x1_5, PPLCNet_x2_0, PPLCNet_x2_5
+from ppcls.arch.backbone.legendary_models.pp_lcnet_v2 import PPLCNetV2_base
 from ppcls.arch.backbone.legendary_models.esnet import ESNet_x0_25, ESNet_x0_5, ESNet_x0_75, ESNet_x1_0
 
 from ppcls.arch.backbone.model_zoo.resnet_vc import ResNet50_vc

ppcls/arch/backbone/legendary_models/pp_lcnet_v2.py

+# copyright (c) 2022 PaddlePaddle Authors. All Rights Reserve.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
+
+import paddle
+import paddle.nn as nn
+import paddle.nn.functional as F
+from paddle import ParamAttr
+from paddle.nn import AdaptiveAvgPool2D, BatchNorm, Conv2D, Dropout, Linear
+from paddle.regularizer import L2Decay
+from paddle.nn.initializer import KaimingNormal
+from ppcls.arch.backbone.base.theseus_layer import TheseusLayer
+from ppcls.utils.save_load import load_dygraph_pretrain, load_dygraph_pretrain_from_url
+
+#TODO(gaotingquan): upload pretrained to bos
+MODEL_URLS = {
+    "PPLCNetV2_base":
+    "https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/legendary_models/PPLCNetV2_base_pretrained.pdparams",
+}
+
+__all__ = list(MODEL_URLS.keys())
+
+NET_CONFIG = {
+    # in_channels, kernel_size, split_pw, use_rep, use_se, use_shortcut
+    "stage1": [64, 3, False, False, False, False],
+    "stage2": [128, 3, False, False, False, False],
+    "stage3": [256, 5, True, True, True, False],
+    "stage4": [512, 5, False, True, False, True],
+}
+
+
+def make_divisible(v, divisor=8, min_value=None):
+    if min_value is None:
+        min_value = divisor
+    new_v = max(min_value, int(v + divisor / 2) // divisor * divisor)
+    if new_v < 0.9 * v:
+        new_v += divisor
+    return new_v
+
+
+class ConvBNLayer(TheseusLayer):
+    def __init__(self,
+                 in_channels,
+                 out_channels,
+                 kernel_size,
+                 stride,
+                 groups=1,
+                 use_act=True):
+        super().__init__()
+        self.use_act = use_act
+        self.conv = Conv2D(
+            in_channels=in_channels,
+            out_channels=out_channels,
+            kernel_size=kernel_size,
+            stride=stride,
+            padding=(kernel_size - 1) // 2,
+            groups=groups,
+            weight_attr=ParamAttr(initializer=KaimingNormal()),
+            bias_attr=False)
+
+        self.bn = BatchNorm(
+            out_channels,
+            param_attr=ParamAttr(regularizer=L2Decay(0.0)),
+            bias_attr=ParamAttr(regularizer=L2Decay(0.0)))
+        if self.use_act:
+            self.act = nn.ReLU()
+
+    def forward(self, x):
+        x = self.conv(x)
+        x = self.bn(x)
+        if self.use_act:
+            x = self.act(x)
+        return x
+
+
+class SEModule(TheseusLayer):
+    def __init__(self, channel, reduction=4):
+        super().__init__()
+        self.avg_pool = AdaptiveAvgPool2D(1)
+        self.conv1 = Conv2D(
+            in_channels=channel,
+            out_channels=channel // reduction,
+            kernel_size=1,
+            stride=1,
+            padding=0)
+        self.relu = nn.ReLU()
+        self.conv2 = Conv2D(
+            in_channels=channel // reduction,
+            out_channels=channel,
+            kernel_size=1,
+            stride=1,
+            padding=0)
+        self.hardsigmoid = nn.Sigmoid()
+
+    def forward(self, x):
+        identity = x
+        x = self.avg_pool(x)
+        x = self.conv1(x)
+        x = self.relu(x)
+        x = self.conv2(x)
+        x = self.hardsigmoid(x)
+        x = paddle.multiply(x=identity, y=x)
+        return x
+
+
+class RepDepthwiseSeparable(TheseusLayer):
+    def __init__(self,
+                 in_channels,
+                 out_channels,
+                 stride,
+                 dw_size=3,
+                 split_pw=False,
+                 use_rep=False,
+                 use_se=False,
+                 use_shortcut=False):
+        super().__init__()
+        self.is_repped = False
+
+        self.dw_size = dw_size
+        self.split_pw = split_pw
+        self.use_rep = use_rep
+        self.use_se = use_se
+        self.use_shortcut = True if use_shortcut and stride == 1 and in_channels == out_channels else False
+
+        if self.use_rep:
+            self.dw_conv_list = nn.LayerList()
+            for kernel_size in range(self.dw_size, 0, -2):
+                if kernel_size == 1 and stride != 1:
+                    continue
+                dw_conv = ConvBNLayer(
+                    in_channels=in_channels,
+                    out_channels=in_channels,
+                    kernel_size=kernel_size,
+                    stride=stride,
+                    groups=in_channels,
+                    use_act=False)
+                self.dw_conv_list.append(dw_conv)
+            self.dw_conv = nn.Conv2D(
+                in_channels=in_channels,
+                out_channels=in_channels,
+                kernel_size=dw_size,
+                stride=stride,
+                padding=(dw_size - 1) // 2,
+                groups=in_channels)
+        else:
+            self.dw_conv = ConvBNLayer(
+                in_channels=in_channels,
+                out_channels=in_channels,
+                kernel_size=dw_size,
+                stride=stride,
+                groups=in_channels)
+
+        self.act = nn.ReLU()
+
+        if use_se:
+            self.se = SEModule(in_channels)
+
+        if self.split_pw:
+            pw_ratio = 0.5
+            self.pw_conv_1 = ConvBNLayer(
+                in_channels=in_channels,
+                kernel_size=1,
+                out_channels=int(out_channels * pw_ratio),
+                stride=1)
+            self.pw_conv_2 = ConvBNLayer(
+                in_channels=int(out_channels * pw_ratio),
+                kernel_size=1,
+                out_channels=out_channels,
+                stride=1)
+        else:
+            self.pw_conv = ConvBNLayer(
+                in_channels=in_channels,
+                kernel_size=1,
+                out_channels=out_channels,
+                stride=1)
+
+    def forward(self, x):
+        if self.use_rep:
+            if not self.training and not self.is_repped:
+                self.rep()
+                self.is_repped = True
+            if self.training and self.is_repped:
+                self.is_repped = False
+
+            input_x = x
+            if not self.training:
+                x = self.act(self.dw_conv(x))
+            else:
+                y = self.dw_conv_list[0](x)
+                for dw_conv in self.dw_conv_list[1:]:
+                    y += dw_conv(x)
+                x = self.act(y)
+        else:
+            x = self.dw_conv(x)
+
+        if self.use_se:
+            x = self.se(x)
+        if self.split_pw:
+            x = self.pw_conv_1(x)
+            x = self.pw_conv_2(x)
+        else:
+            x = self.pw_conv(x)
+        if self.use_shortcut:
+            x = x + input_x
+        return x
+
+    def rep(self):
+        kernel, bias = self._get_equivalent_kernel_bias()
+        self.dw_conv.weight.set_value(kernel)
+        self.dw_conv.bias.set_value(bias)
+
+    def _get_equivalent_kernel_bias(self):
+        kernel_sum = 0
+        bias_sum = 0
+        for dw_conv in self.dw_conv_list:
+            kernel, bias = self._fuse_bn_tensor(dw_conv)
+            kernel = self._pad_tensor(kernel, to_size=self.dw_size)
+            kernel_sum += kernel
+            bias_sum += bias
+        return kernel_sum, bias_sum
+
+    def _fuse_bn_tensor(self, branch):
+        kernel = branch.conv.weight
+        running_mean = branch.bn._mean
+        running_var = branch.bn._variance
+        gamma = branch.bn.weight
+        beta = branch.bn.bias
+        eps = branch.bn._epsilon
+        std = (running_var + eps).sqrt()
+        t = (gamma / std).reshape((-1, 1, 1, 1))
+        return kernel * t, beta - running_mean * gamma / std
+
+    def _pad_tensor(self, tensor, to_size):
+        from_size = tensor.shape[-1]
+        if from_size == to_size:
+            return tensor
+        pad = (to_size - from_size) // 2
+        return F.pad(tensor, [pad, pad, pad, pad])
+
+
+class PPLCNetV2(TheseusLayer):
+    def __init__(self,
+                 scale=1.0,
+                 depths=[2, 2, 6, 2],
+                 class_num=1000,
+                 dropout_prob=0.2,
+                 class_expand=1280):
+        super().__init__()
+        self.scale = scale
+        self.class_expand = class_expand
+
+        self.stem = nn.Sequential(* [
+            ConvBNLayer(
+                in_channels=3,
+                kernel_size=3,
+                out_channels=make_divisible(32 * scale),
+                stride=2), RepDepthwiseSeparable(
+                    in_channels=make_divisible(32 * scale),
+                    out_channels=make_divisible(64 * scale),
+                    stride=1,
+                    dw_size=3)
+        ])
+
+        # stage1
+        in_channels, kernel_size, split_pw, use_rep, use_se, use_shortcut = NET_CONFIG[
+            "stage1"]
+        self.stage1 = nn.Sequential(* [
+            RepDepthwiseSeparable(
+                in_channels=make_divisible((in_channels if i == 0 else
+                                            in_channels * 2) * scale),
+                out_channels=make_divisible(in_channels * 2 * scale),
+                stride=2 if i == 0 else 1,
+                dw_size=kernel_size,
+                split_pw=split_pw,
+                use_rep=use_rep,
+                use_se=use_se,
+                use_shortcut=use_shortcut, ) for i in range(depths[0])
+        ])
+
+        # stage2
+        in_channels, kernel_size, split_pw, use_rep, use_se, use_shortcut = NET_CONFIG[
+            "stage2"]
+        self.stage2 = nn.Sequential(* [
+            RepDepthwiseSeparable(
+                in_channels=make_divisible((in_channels if i == 0 else
+                                            in_channels * 2) * scale),
+                out_channels=make_divisible(in_channels * 2 * scale),
+                stride=2 if i == 0 else 1,
+                dw_size=kernel_size,
+                split_pw=split_pw,
+                use_rep=use_rep,
+                use_se=use_se,
+                use_shortcut=use_shortcut, ) for i in range(depths[1])
+        ])
+
+        # stage3
+        in_channels, kernel_size, split_pw, use_rep, use_se, use_shortcut = NET_CONFIG[
+            "stage3"]
+        self.stage3 = nn.Sequential(* [
+            RepDepthwiseSeparable(
+                in_channels=make_divisible((in_channels if i == 0 else
+                                            in_channels * 2) * scale),
+                out_channels=make_divisible(in_channels * 2 * scale),
+                stride=2 if i == 0 else 1,
+                dw_size=kernel_size,
+                split_pw=split_pw,
+                use_rep=use_rep,
+                use_se=use_se,
+                use_shortcut=use_shortcut, ) for i in range(depths[2])
+        ])
+
+        # stage4
+        in_channels, kernel_size, split_pw, use_rep, use_se, use_shortcut = NET_CONFIG[
+            "stage4"]
+        self.stage4 = nn.Sequential(* [
+            RepDepthwiseSeparable(
+                in_channels=make_divisible((in_channels if i == 0 else
+                                            in_channels * 2) * scale),
+                out_channels=make_divisible(in_channels * 2 * scale),
+                stride=2 if i == 0 else 1,
+                dw_size=kernel_size,
+                split_pw=split_pw,
+                use_rep=use_rep,
+                use_se=use_se,
+                use_shortcut=use_shortcut, ) for i in range(depths[3])
+        ])
+
+        self.avg_pool = AdaptiveAvgPool2D(1)
+
+        self.last_conv = Conv2D(
+            in_channels=make_divisible(NET_CONFIG["stage4"][0] * 2 * scale),
+            out_channels=self.class_expand,
+            kernel_size=1,
+            stride=1,
+            padding=0,
+            bias_attr=False)
+
+        self.act = nn.ReLU()
+        self.dropout = Dropout(p=dropout_prob, mode="downscale_in_infer")
+        self.flatten = nn.Flatten(start_axis=1, stop_axis=-1)
+
+        self.fc = Linear(self.class_expand, class_num)
+
+    def forward(self, x):
+        x = self.stem(x)
+        x = self.stage1(x)
+        x = self.stage2(x)
+        x = self.stage3(x)
+        x = self.stage4(x)
+        x = self.avg_pool(x)
+        x = self.last_conv(x)
+        x = self.act(x)
+        x = self.dropout(x)
+        x = self.flatten(x)
+        x = self.fc(x)
+        return x
+
+
+def _load_pretrained(pretrained, model, model_url, use_ssld):
+    if pretrained is False:
+        pass
+    elif pretrained is True:
+        load_dygraph_pretrain_from_url(model, model_url, use_ssld=use_ssld)
+    elif isinstance(pretrained, str):
+        load_dygraph_pretrain(model, pretrained)
+    else:
+        raise RuntimeError(
+            "pretrained type is not available. Please use `string` or `boolean` type."
+        )
+
+
+def PPLCNetV2_base(pretrained=False, use_ssld=False, **kwargs):
+    """
+    PPLCNetV2_base
+    Args:
+        pretrained: bool=False or str. If `True` load pretrained parameters, `False` otherwise.
+                    If str, means the path of the pretrained model.
+        use_ssld: bool=False. Whether using distillation pretrained model when pretrained=True.
+    Returns:
+        model: nn.Layer. Specific `PPLCNetV2_base` model depends on args.
+    """
+    model = PPLCNetV2(scale=1.0, depths=[2, 2, 6, 2], **kwargs)
+    _load_pretrained(pretrained, model, MODEL_URLS["PPLCNetV2_base"], use_ssld)
+    return model