From af65349528bc1316948af8185895fb028424b5f7 Mon Sep 17 00:00:00 2001
From: FlyingQianMM <245467267@qq.com>
Date: Sun, 24 May 2020 20:04:48 +0800
Subject: [PATCH] add hrnet.py in segmentation

---
 paddlex/cv/nets/hrnet.py              | 474 ++++++++++++++++++++++++++
 paddlex/cv/nets/segmentation/hrnet.py | 196 +++++++++++
 2 files changed, 670 insertions(+)
 create mode 100644 paddlex/cv/nets/hrnet.py
 create mode 100644 paddlex/cv/nets/segmentation/hrnet.py

diff --git a/paddlex/cv/nets/hrnet.py b/paddlex/cv/nets/hrnet.py
new file mode 100644
index 0000000..19f9cb3
--- /dev/null
+++ b/paddlex/cv/nets/hrnet.py
@@ -0,0 +1,474 @@
+# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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
+from __future__ import division
+from __future__ import print_function
+
+from collections import OrderedDict
+
+from paddle import fluid
+from paddle.fluid.param_attr import ParamAttr
+from paddle.fluid.framework import Variable
+from paddle.fluid.regularizer import L2Decay
+
+from numbers import Integral
+from paddle.fluid.initializer import MSRA
+import math
+
+__all__ = ['HRNet']
+
+
+class HRNet(object):
+    def __init__(self,
+                 width=40,
+                 has_se=False,
+                 freeze_at=0,
+                 norm_type='bn',
+                 freeze_norm=False,
+                 norm_decay=0.,
+                 feature_maps=[2, 3, 4, 5],
+                 num_classes=None):
+        super(HRNet, self).__init__()
+
+        if isinstance(feature_maps, Integral):
+            feature_maps = [feature_maps]
+
+        assert 0 <= freeze_at <= 4, "freeze_at should be 0, 1, 2, 3 or 4"
+        assert len(feature_maps) > 0, "need one or more feature maps"
+        assert norm_type in ['bn', 'sync_bn']
+
+        self.width = width
+        self.has_se = has_se
+        self.channels = {
+            18: [[18, 36], [18, 36, 72], [18, 36, 72, 144]],
+            30: [[30, 60], [30, 60, 120], [30, 60, 120, 240]],
+            32: [[32, 64], [32, 64, 128], [32, 64, 128, 256]],
+            40: [[40, 80], [40, 80, 160], [40, 80, 160, 320]],
+            44: [[44, 88], [44, 88, 176], [44, 88, 176, 352]],
+            48: [[48, 96], [48, 96, 192], [48, 96, 192, 384]],
+            60: [[60, 120], [60, 120, 240], [60, 120, 240, 480]],
+            64: [[64, 128], [64, 128, 256], [64, 128, 256, 512]],
+        }
+
+        self.freeze_at = freeze_at
+        self.norm_type = norm_type
+        self.norm_decay = norm_decay
+        self.freeze_norm = freeze_norm
+        self.feature_maps = feature_maps
+        self.num_classes = num_classes
+        self.end_points = []
+        return
+
+    def net(self, input, class_dim=1000):
+        width = self.width
+        channels_2, channels_3, channels_4 = self.channels[width]
+        num_modules_2, num_modules_3, num_modules_4 = 1, 4, 3
+
+        x = self.conv_bn_layer(
+            input=input,
+            filter_size=3,
+            num_filters=64,
+            stride=2,
+            if_act=True,
+            name='layer1_1')
+        x = self.conv_bn_layer(
+            input=x,
+            filter_size=3,
+            num_filters=64,
+            stride=2,
+            if_act=True,
+            name='layer1_2')
+
+        la1 = self.layer1(x, name='layer2')
+        tr1 = self.transition_layer([la1], [256], channels_2, name='tr1')
+        st2 = self.stage(tr1, num_modules_2, channels_2, name='st2')
+        tr2 = self.transition_layer(st2, channels_2, channels_3, name='tr2')
+        st3 = self.stage(tr2, num_modules_3, channels_3, name='st3')
+        tr3 = self.transition_layer(st3, channels_3, channels_4, name='tr3')
+        st4 = self.stage(tr3, num_modules_4, channels_4, name='st4')
+
+        # classification
+        if self.num_classes:
+            last_cls = self.last_cls_out(x=st4, name='cls_head')
+            y = last_cls[0]
+            last_num_filters = [256, 512, 1024]
+            for i in range(3):
+                y = fluid.layers.elementwise_add(
+                    last_cls[i + 1],
+                    self.conv_bn_layer(
+                        input=y,
+                        filter_size=3,
+                        num_filters=last_num_filters[i],
+                        stride=2,
+                        name='cls_head_add' + str(i + 1)))
+
+            y = self.conv_bn_layer(
+                input=y,
+                filter_size=1,
+                num_filters=2048,
+                stride=1,
+                name='cls_head_last_conv')
+            pool = fluid.layers.pool2d(
+                input=y, pool_type='avg', global_pooling=True)
+            stdv = 1.0 / math.sqrt(pool.shape[1] * 1.0)
+            out = fluid.layers.fc(
+                input=pool,
+                size=class_dim,
+                param_attr=ParamAttr(
+                    name='fc_weights',
+                    initializer=fluid.initializer.Uniform(-stdv, stdv)),
+                bias_attr=ParamAttr(name='fc_offset'))
+            return out
+
+        # segmentation
+        if self.feature_maps == "stage4":
+            return st4
+
+        self.end_points = st4
+        return st4[-1]
+
+    def layer1(self, input, name=None):
+        conv = input
+        for i in range(4):
+            conv = self.bottleneck_block(
+                conv,
+                num_filters=64,
+                downsample=True if i == 0 else False,
+                name=name + '_' + str(i + 1))
+        return conv
+
+    def transition_layer(self, x, in_channels, out_channels, name=None):
+        num_in = len(in_channels)
+        num_out = len(out_channels)
+        out = []
+        for i in range(num_out):
+            if i < num_in:
+                if in_channels[i] != out_channels[i]:
+                    residual = self.conv_bn_layer(
+                        x[i],
+                        filter_size=3,
+                        num_filters=out_channels[i],
+                        name=name + '_layer_' + str(i + 1))
+                    out.append(residual)
+                else:
+                    out.append(x[i])
+            else:
+                residual = self.conv_bn_layer(
+                    x[-1],
+                    filter_size=3,
+                    num_filters=out_channels[i],
+                    stride=2,
+                    name=name + '_layer_' + str(i + 1))
+                out.append(residual)
+        return out
+
+    def branches(self, x, block_num, channels, name=None):
+        out = []
+        for i in range(len(channels)):
+            residual = x[i]
+            for j in range(block_num):
+                residual = self.basic_block(
+                    residual,
+                    channels[i],
+                    name=name + '_branch_layer_' + str(i + 1) + '_' +
+                    str(j + 1))
+            out.append(residual)
+        return out
+
+    def fuse_layers(self, x, channels, multi_scale_output=True, name=None):
+        out = []
+        for i in range(len(channels) if multi_scale_output else 1):
+            residual = x[i]
+            if self.feature_maps == "stage4":
+                shape = fluid.layers.shape(residual)
+                width = shape[-1]
+                height = shape[-2]
+            for j in range(len(channels)):
+                if j > i:
+                    y = self.conv_bn_layer(
+                        x[j],
+                        filter_size=1,
+                        num_filters=channels[i],
+                        if_act=False,
+                        name=name + '_layer_' + str(i + 1) + '_' + str(j + 1))
+                    if self.feature_maps == "stage4":
+                        y = fluid.layers.resize_bilinear(
+                            input=y, out_shape=[height, width])
+                    else:
+                        y = fluid.layers.resize_nearest(
+                            input=y, scale=2**(j - i))
+                    residual = fluid.layers.elementwise_add(
+                        x=residual, y=y, act=None)
+                elif j < i:
+                    y = x[j]
+                    for k in range(i - j):
+                        if k == i - j - 1:
+                            y = self.conv_bn_layer(
+                                y,
+                                filter_size=3,
+                                num_filters=channels[i],
+                                stride=2,
+                                if_act=False,
+                                name=name + '_layer_' + str(i + 1) + '_' +
+                                str(j + 1) + '_' + str(k + 1))
+                        else:
+                            y = self.conv_bn_layer(
+                                y,
+                                filter_size=3,
+                                num_filters=channels[j],
+                                stride=2,
+                                name=name + '_layer_' + str(i + 1) + '_' +
+                                str(j + 1) + '_' + str(k + 1))
+                    residual = fluid.layers.elementwise_add(
+                        x=residual, y=y, act=None)
+
+            residual = fluid.layers.relu(residual)
+            out.append(residual)
+        return out
+
+    def high_resolution_module(self,
+                               x,
+                               channels,
+                               multi_scale_output=True,
+                               name=None):
+        residual = self.branches(x, 4, channels, name=name)
+        out = self.fuse_layers(
+            residual,
+            channels,
+            multi_scale_output=multi_scale_output,
+            name=name)
+        return out
+
+    def stage(self,
+              x,
+              num_modules,
+              channels,
+              multi_scale_output=True,
+              name=None):
+        out = x
+        for i in range(num_modules):
+            if i == num_modules - 1 and multi_scale_output == False:
+                out = self.high_resolution_module(
+                    out,
+                    channels,
+                    multi_scale_output=False,
+                    name=name + '_' + str(i + 1))
+            else:
+                out = self.high_resolution_module(
+                    out, channels, name=name + '_' + str(i + 1))
+
+        return out
+
+    def last_cls_out(self, x, name=None):
+        out = []
+        num_filters_list = [32, 64, 128, 256]
+        for i in range(len(x)):
+            out.append(
+                self.bottleneck_block(
+                    input=x[i],
+                    num_filters=num_filters_list[i],
+                    name=name + 'conv_' + str(i + 1),
+                    downsample=True))
+        return out
+
+    def basic_block(self,
+                    input,
+                    num_filters,
+                    stride=1,
+                    downsample=False,
+                    name=None):
+        residual = input
+        conv = self.conv_bn_layer(
+            input=input,
+            filter_size=3,
+            num_filters=num_filters,
+            stride=stride,
+            name=name + '_conv1')
+        conv = self.conv_bn_layer(
+            input=conv,
+            filter_size=3,
+            num_filters=num_filters,
+            if_act=False,
+            name=name + '_conv2')
+        if downsample:
+            residual = self.conv_bn_layer(
+                input=input,
+                filter_size=1,
+                num_filters=num_filters,
+                if_act=False,
+                name=name + '_downsample')
+        if self.has_se:
+            conv = self.squeeze_excitation(
+                input=conv,
+                num_channels=num_filters,
+                reduction_ratio=16,
+                name=name + '_fc')
+        return fluid.layers.elementwise_add(x=residual, y=conv, act='relu')
+
+    def bottleneck_block(self,
+                         input,
+                         num_filters,
+                         stride=1,
+                         downsample=False,
+                         name=None):
+        residual = input
+        conv = self.conv_bn_layer(
+            input=input,
+            filter_size=1,
+            num_filters=num_filters,
+            name=name + '_conv1')
+        conv = self.conv_bn_layer(
+            input=conv,
+            filter_size=3,
+            num_filters=num_filters,
+            stride=stride,
+            name=name + '_conv2')
+        conv = self.conv_bn_layer(
+            input=conv,
+            filter_size=1,
+            num_filters=num_filters * 4,
+            if_act=False,
+            name=name + '_conv3')
+        if downsample:
+            residual = self.conv_bn_layer(
+                input=input,
+                filter_size=1,
+                num_filters=num_filters * 4,
+                if_act=False,
+                name=name + '_downsample')
+        if self.has_se:
+            conv = self.squeeze_excitation(
+                input=conv,
+                num_channels=num_filters * 4,
+                reduction_ratio=16,
+                name=name + '_fc')
+        return fluid.layers.elementwise_add(x=residual, y=conv, act='relu')
+
+    def squeeze_excitation(self,
+                           input,
+                           num_channels,
+                           reduction_ratio,
+                           name=None):
+        pool = fluid.layers.pool2d(
+            input=input, pool_size=0, pool_type='avg', global_pooling=True)
+        stdv = 1.0 / math.sqrt(pool.shape[1] * 1.0)
+        squeeze = fluid.layers.fc(
+            input=pool,
+            size=num_channels / reduction_ratio,
+            act='relu',
+            param_attr=fluid.param_attr.ParamAttr(
+                initializer=fluid.initializer.Uniform(-stdv, stdv),
+                name=name + '_sqz_weights'),
+            bias_attr=ParamAttr(name=name + '_sqz_offset'))
+        stdv = 1.0 / math.sqrt(squeeze.shape[1] * 1.0)
+        excitation = fluid.layers.fc(
+            input=squeeze,
+            size=num_channels,
+            act='sigmoid',
+            param_attr=fluid.param_attr.ParamAttr(
+                initializer=fluid.initializer.Uniform(-stdv, stdv),
+                name=name + '_exc_weights'),
+            bias_attr=ParamAttr(name=name + '_exc_offset'))
+        scale = fluid.layers.elementwise_mul(x=input, y=excitation, axis=0)
+        return scale
+
+    def conv_bn_layer(self,
+                      input,
+                      filter_size,
+                      num_filters,
+                      stride=1,
+                      padding=1,
+                      num_groups=1,
+                      if_act=True,
+                      name=None):
+        conv = fluid.layers.conv2d(
+            input=input,
+            num_filters=num_filters,
+            filter_size=filter_size,
+            stride=stride,
+            padding=(filter_size - 1) // 2,
+            groups=num_groups,
+            act=None,
+            param_attr=ParamAttr(
+                initializer=MSRA(), name=name + '_weights'),
+            bias_attr=False)
+        bn_name = name + '_bn'
+        bn = self._bn(input=conv, bn_name=bn_name)
+        if if_act:
+            bn = fluid.layers.relu(bn)
+        return bn
+
+    def _bn(self, input, act=None, bn_name=None):
+        norm_lr = 0. if self.freeze_norm else 1.
+        norm_decay = self.norm_decay
+        if self.num_classes or self.feature_maps == "stage4":
+            regularizer = None
+            pattr_initializer = fluid.initializer.Constant(1.0)
+            battr_initializer = fluid.initializer.Constant(0.0)
+        else:
+            regularizer = L2Decay(norm_decay)
+            pattr_initializer = None
+            battr_initializer = None
+        pattr = ParamAttr(
+            name=bn_name + '_scale',
+            learning_rate=norm_lr,
+            regularizer=regularizer,
+            initializer=pattr_initializer)
+        battr = ParamAttr(
+            name=bn_name + '_offset',
+            learning_rate=norm_lr,
+            regularizer=regularizer,
+            initializer=battr_initializer)
+
+        global_stats = True if self.freeze_norm else False
+        out = fluid.layers.batch_norm(
+            input=input,
+            act=act,
+            name=bn_name + '.output.1',
+            param_attr=pattr,
+            bias_attr=battr,
+            moving_mean_name=bn_name + '_mean',
+            moving_variance_name=bn_name + '_variance',
+            use_global_stats=global_stats)
+        scale = fluid.framework._get_var(pattr.name)
+        bias = fluid.framework._get_var(battr.name)
+        if self.freeze_norm:
+            scale.stop_gradient = True
+            bias.stop_gradient = True
+        return out
+
+    def __call__(self, input):
+        assert isinstance(input, Variable)
+        if isinstance(self.feature_maps, (list, tuple)):
+            assert not (set(self.feature_maps) - set([2, 3, 4, 5])), \
+                "feature maps {} not in [2, 3, 4, 5]".format(self.feature_maps)
+
+        res_endpoints = []
+
+        res = input
+        feature_maps = self.feature_maps
+        out = self.net(input)
+        if self.num_classes or self.feature_maps == "stage4":
+            return out
+
+        for i in feature_maps:
+            res = self.end_points[i - 2]
+            if i in self.feature_maps:
+                res_endpoints.append(res)
+            if self.freeze_at >= i:
+                res.stop_gradient = True
+
+        return OrderedDict([('res{}_sum'.format(self.feature_maps[idx]), feat)
+                            for idx, feat in enumerate(res_endpoints)])
diff --git a/paddlex/cv/nets/segmentation/hrnet.py b/paddlex/cv/nets/segmentation/hrnet.py
new file mode 100644
index 0000000..65f3bfb
--- /dev/null
+++ b/paddlex/cv/nets/segmentation/hrnet.py
@@ -0,0 +1,196 @@
+# coding: utf8
+# copyright (c) 2020 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
+from __future__ import division
+from __future__ import print_function
+
+from collections import OrderedDict
+
+import paddle.fluid as fluid
+from paddle.fluid.initializer import MSRA
+from paddle.fluid.param_attr import ParamAttr
+from .model_utils.libs import sigmoid_to_softmax
+from .model_utils.loss import softmax_with_loss
+from .model_utils.loss import dice_loss
+from .model_utils.loss import bce_loss
+import paddlex
+import paddlex.utils.logging as logging
+
+
+class HRNet(object):
+    def __init__(self,
+                 num_classes,
+                 mode='train',
+                 width=18,
+                 use_bce_loss=False,
+                 use_dice_loss=False,
+                 class_weight=None,
+                 ignore_index=255):
+        # dice_loss或bce_loss只适用两类分割中
+        if num_classes > 2 and (use_bce_loss or use_dice_loss):
+            raise ValueError(
+                "dice loss and bce loss is only applicable to binary classfication"
+            )
+
+        if class_weight is not None:
+            if isinstance(class_weight, list):
+                if len(class_weight) != num_classes:
+                    raise ValueError(
+                        "Length of class_weight should be equal to number of classes"
+                    )
+            elif isinstance(class_weight, str):
+                if class_weight.lower() != 'dynamic':
+                    raise ValueError(
+                        "if class_weight is string, must be dynamic!")
+            else:
+                raise TypeError(
+                    'Expect class_weight is a list or string but receive {}'.
+                    format(type(class_weight)))
+
+        self.num_classes = num_classes
+        self.mode = mode
+        self.use_bce_loss = use_bce_loss
+        self.use_dice_loss = use_dice_loss
+        self.class_weight = class_weight
+        self.ignore_index = ignore_index
+        self.backbone = paddlex.cv.nets.hrnet.HRNet(
+            width=width, feature_maps="stage4")
+
+    def build_net(self, inputs):
+        if self.use_dice_loss or self.use_bce_loss:
+            self.num_classes = 1
+        image = inputs['image']
+        st4 = self.backbone(image)
+        # upsample
+        shape = fluid.layers.shape(st4[0])[-2:]
+        st4[1] = fluid.layers.resize_bilinear(st4[1], out_shape=shape)
+        st4[2] = fluid.layers.resize_bilinear(st4[2], out_shape=shape)
+        st4[3] = fluid.layers.resize_bilinear(st4[3], out_shape=shape)
+
+        out = fluid.layers.concat(st4, axis=1)
+        last_channels = sum(self.backbone.channels[self.backbone.width][-1])
+
+        out = self._conv_bn_layer(
+            input=out,
+            filter_size=1,
+            num_filters=last_channels,
+            stride=1,
+            if_act=True,
+            name='conv-2')
+        out = fluid.layers.conv2d(
+            input=out,
+            num_filters=self.num_classes,
+            filter_size=1,
+            stride=1,
+            padding=0,
+            act=None,
+            param_attr=ParamAttr(
+                initializer=MSRA(), name='conv-1_weights'),
+            bias_attr=False)
+
+        input_shape = fluid.layers.shape(image)[-2:]
+        logit = fluid.layers.resize_bilinear(out, input_shape)
+
+        if self.num_classes == 1:
+            out = sigmoid_to_softmax(logit)
+            out = fluid.layers.transpose(out, [0, 2, 3, 1])
+        else:
+            out = fluid.layers.transpose(logit, [0, 2, 3, 1])
+
+        pred = fluid.layers.argmax(out, axis=3)
+        pred = fluid.layers.unsqueeze(pred, axes=[3])
+
+        if self.mode == 'train':
+            label = inputs['label']
+            mask = label != self.ignore_index
+            return self._get_loss(logit, label, mask)
+        elif self.mode == 'eval':
+            label = inputs['label']
+            mask = label != self.ignore_index
+            loss = self._get_loss(logit, label, mask)
+            return loss, pred, label, mask
+        else:
+            if self.num_classes == 1:
+                logit = sigmoid_to_softmax(logit)
+            else:
+                logit = fluid.layers.softmax(logit, axis=1)
+            return pred, logit
+
+    def generate_inputs(self):
+        inputs = OrderedDict()
+        inputs['image'] = fluid.data(
+            dtype='float32', shape=[None, 3, None, None], name='image')
+        if self.mode == 'train':
+            inputs['label'] = fluid.data(
+                dtype='int32', shape=[None, 1, None, None], name='label')
+        elif self.mode == 'eval':
+            inputs['label'] = fluid.data(
+                dtype='int32', shape=[None, 1, None, None], name='label')
+        return inputs
+
+    def _get_loss(self, logit, label, mask):
+        avg_loss = 0
+        if not (self.use_dice_loss or self.use_bce_loss):
+            avg_loss += softmax_with_loss(
+                logit,
+                label,
+                mask,
+                num_classes=self.num_classes,
+                weight=self.class_weight,
+                ignore_index=self.ignore_index)
+        else:
+            if self.use_dice_loss:
+                avg_loss += dice_loss(logit, label, mask)
+            if self.use_bce_loss:
+                avg_loss += bce_loss(
+                    logit, label, mask, ignore_index=self.ignore_index)
+
+        return avg_loss
+
+    def _conv_bn_layer(self,
+                       input,
+                       filter_size,
+                       num_filters,
+                       stride=1,
+                       padding=1,
+                       num_groups=1,
+                       if_act=True,
+                       name=None):
+        conv = fluid.layers.conv2d(
+            input=input,
+            num_filters=num_filters,
+            filter_size=filter_size,
+            stride=stride,
+            padding=(filter_size - 1) // 2,
+            groups=num_groups,
+            act=None,
+            param_attr=ParamAttr(
+                initializer=MSRA(), name=name + '_weights'),
+            bias_attr=False)
+        bn_name = name + '_bn'
+        bn = fluid.layers.batch_norm(
+            input=conv,
+            param_attr=ParamAttr(
+                name=bn_name + "_scale",
+                initializer=fluid.initializer.Constant(1.0)),
+            bias_attr=ParamAttr(
+                name=bn_name + "_offset",
+                initializer=fluid.initializer.Constant(0.0)),
+            moving_mean_name=bn_name + '_mean',
+            moving_variance_name=bn_name + '_variance')
+        if if_act:
+            bn = fluid.layers.relu(bn)
+        return bn
-- 
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