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from __future__ import absolute_import, division, print_function |
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import os |
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import paddle |
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import paddle.nn as nn |
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from paddle import ParamAttr |
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from paddle.nn import AdaptiveAvgPool2D, BatchNorm, Conv2D, Dropout, Linear |
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from paddle.regularizer import L2Decay |
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from paddle.nn.initializer import KaimingNormal |
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from paddle.utils.download import get_path_from_url |
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MODEL_URLS = { |
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"PPLCNet_x0.25": |
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"https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/legendary_models/PPLCNet_x0_25_pretrained.pdparams", |
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"PPLCNet_x0.35": |
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"https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/legendary_models/PPLCNet_x0_35_pretrained.pdparams", |
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"PPLCNet_x0.5": |
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"https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/legendary_models/PPLCNet_x0_5_pretrained.pdparams", |
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"PPLCNet_x0.75": |
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"https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/legendary_models/PPLCNet_x0_75_pretrained.pdparams", |
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"PPLCNet_x1.0": |
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"https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/legendary_models/PPLCNet_x1_0_pretrained.pdparams", |
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"PPLCNet_x1.5": |
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"https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/legendary_models/PPLCNet_x1_5_pretrained.pdparams", |
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"PPLCNet_x2.0": |
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"https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/legendary_models/PPLCNet_x2_0_pretrained.pdparams", |
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"PPLCNet_x2.5": |
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"https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/legendary_models/PPLCNet_x2_5_pretrained.pdparams" |
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} |
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MODEL_STAGES_PATTERN = { |
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"PPLCNet": ["blocks2", "blocks3", "blocks4", "blocks5", "blocks6"] |
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} |
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__all__ = list(MODEL_URLS.keys()) |
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NET_CONFIG = { |
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"blocks2": |
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[[3, 16, 32, 1, False]], |
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"blocks3": [[3, 32, 64, 2, False], [3, 64, 64, 1, False]], |
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"blocks4": [[3, 64, 128, 2, False], [3, 128, 128, 1, False]], |
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"blocks5": |
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[[3, 128, 256, 2, False], [5, 256, 256, 1, False], [5, 256, 256, 1, False], |
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[5, 256, 256, 1, False], [5, 256, 256, 1, False], [5, 256, 256, 1, False]], |
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"blocks6": [[5, 256, 512, 2, True], [5, 512, 512, 1, True]] |
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} |
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def make_divisible(v, divisor=8, min_value=None): |
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if min_value is None: |
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min_value = divisor |
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new_v = max(min_value, int(v + divisor / 2) // divisor * divisor) |
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if new_v < 0.9 * v: |
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new_v += divisor |
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return new_v |
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class ConvBNLayer(nn.Layer): |
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def __init__(self, |
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num_channels, |
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filter_size, |
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num_filters, |
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stride, |
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num_groups=1): |
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super().__init__() |
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self.conv = Conv2D( |
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in_channels=num_channels, |
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out_channels=num_filters, |
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kernel_size=filter_size, |
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stride=stride, |
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padding=(filter_size - 1) // 2, |
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groups=num_groups, |
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weight_attr=ParamAttr(initializer=KaimingNormal()), |
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bias_attr=False) |
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self.bn = BatchNorm( |
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num_filters, |
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param_attr=ParamAttr(regularizer=L2Decay(0.0)), |
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bias_attr=ParamAttr(regularizer=L2Decay(0.0))) |
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self.hardswish = nn.Hardswish() |
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def forward(self, x): |
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x = self.conv(x) |
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x = self.bn(x) |
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x = self.hardswish(x) |
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return x |
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class DepthwiseSeparable(nn.Layer): |
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def __init__(self, |
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num_channels, |
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num_filters, |
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stride, |
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dw_size=3, |
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use_se=False): |
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super().__init__() |
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self.use_se = use_se |
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self.dw_conv = ConvBNLayer( |
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num_channels=num_channels, |
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num_filters=num_channels, |
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filter_size=dw_size, |
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stride=stride, |
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num_groups=num_channels) |
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if use_se: |
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self.se = SEModule(num_channels) |
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self.pw_conv = ConvBNLayer( |
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num_channels=num_channels, |
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filter_size=1, |
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num_filters=num_filters, |
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stride=1) |
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def forward(self, x): |
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x = self.dw_conv(x) |
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if self.use_se: |
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x = self.se(x) |
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x = self.pw_conv(x) |
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return x |
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class SEModule(nn.Layer): |
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def __init__(self, channel, reduction=4): |
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super().__init__() |
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self.avg_pool = AdaptiveAvgPool2D(1) |
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self.conv1 = Conv2D( |
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in_channels=channel, |
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out_channels=channel // reduction, |
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kernel_size=1, |
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stride=1, |
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padding=0) |
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self.relu = nn.ReLU() |
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self.conv2 = Conv2D( |
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in_channels=channel // reduction, |
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out_channels=channel, |
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kernel_size=1, |
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stride=1, |
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padding=0) |
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self.hardsigmoid = nn.Hardsigmoid() |
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def forward(self, x): |
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identity = x |
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x = self.avg_pool(x) |
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x = self.conv1(x) |
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x = self.relu(x) |
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x = self.conv2(x) |
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x = self.hardsigmoid(x) |
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x = paddle.multiply(x=identity, y=x) |
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return x |
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class PPLCNet(nn.Layer): |
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def __init__(self, |
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in_channels=3, |
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scale=1.0, |
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pretrained=False, |
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use_ssld=False): |
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super().__init__() |
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self.out_channels = [ |
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int(NET_CONFIG["blocks3"][-1][2] * scale), |
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int(NET_CONFIG["blocks4"][-1][2] * scale), |
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int(NET_CONFIG["blocks5"][-1][2] * scale), |
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int(NET_CONFIG["blocks6"][-1][2] * scale) |
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] |
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self.scale = scale |
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self.conv1 = ConvBNLayer( |
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num_channels=in_channels, |
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filter_size=3, |
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num_filters=make_divisible(16 * scale), |
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stride=2) |
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self.blocks2 = nn.Sequential(* [ |
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DepthwiseSeparable( |
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num_channels=make_divisible(in_c * scale), |
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num_filters=make_divisible(out_c * scale), |
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dw_size=k, |
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stride=s, |
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use_se=se) |
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for i, (k, in_c, out_c, s, se) in enumerate(NET_CONFIG["blocks2"]) |
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]) |
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self.blocks3 = nn.Sequential(* [ |
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DepthwiseSeparable( |
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num_channels=make_divisible(in_c * scale), |
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num_filters=make_divisible(out_c * scale), |
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dw_size=k, |
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stride=s, |
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use_se=se) |
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for i, (k, in_c, out_c, s, se) in enumerate(NET_CONFIG["blocks3"]) |
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]) |
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self.blocks4 = nn.Sequential(* [ |
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DepthwiseSeparable( |
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num_channels=make_divisible(in_c * scale), |
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num_filters=make_divisible(out_c * scale), |
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dw_size=k, |
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stride=s, |
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use_se=se) |
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for i, (k, in_c, out_c, s, se) in enumerate(NET_CONFIG["blocks4"]) |
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]) |
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self.blocks5 = nn.Sequential(* [ |
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DepthwiseSeparable( |
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num_channels=make_divisible(in_c * scale), |
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num_filters=make_divisible(out_c * scale), |
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dw_size=k, |
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stride=s, |
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use_se=se) |
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for i, (k, in_c, out_c, s, se) in enumerate(NET_CONFIG["blocks5"]) |
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]) |
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self.blocks6 = nn.Sequential(* [ |
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DepthwiseSeparable( |
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num_channels=make_divisible(in_c * scale), |
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num_filters=make_divisible(out_c * scale), |
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dw_size=k, |
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stride=s, |
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use_se=se) |
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for i, (k, in_c, out_c, s, se) in enumerate(NET_CONFIG["blocks6"]) |
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]) |
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if pretrained: |
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self._load_pretrained( |
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MODEL_URLS['PPLCNet_x{}'.format(scale)], use_ssld=use_ssld) |
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def forward(self, x): |
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outs = [] |
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x = self.conv1(x) |
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x = self.blocks2(x) |
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x = self.blocks3(x) |
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outs.append(x) |
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x = self.blocks4(x) |
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outs.append(x) |
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x = self.blocks5(x) |
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outs.append(x) |
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x = self.blocks6(x) |
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outs.append(x) |
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return outs |
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def _load_pretrained(self, pretrained_url, use_ssld=False): |
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if use_ssld: |
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pretrained_url = pretrained_url.replace("_pretrained", |
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"_ssld_pretrained") |
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print(pretrained_url) |
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local_weight_path = get_path_from_url( |
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pretrained_url, os.path.expanduser("~/.paddleclas/weights")) |
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param_state_dict = paddle.load(local_weight_path) |
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self.set_dict(param_state_dict) |
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return |
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