Ross Wightman
5 years ago
parent
dab9935b36
commit
50658b9a67
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"""RegNet
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Paper: `Designing Network Design Spaces` - https://arxiv.org/abs/2003.13678
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Original Impl: https://github.com/facebookresearch/pycls/blob/master/pycls/models/regnet.py
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Based on original PyTorch impl linked above, but re-wrote to use my own blocks (adapted from ResNet here)
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and cleaned up with more descriptive variable names.
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Weights from original impl have been modified
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* first layer from BGR -> RGB as most PyTorch models are
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* removed training specific dict entries from checkpoints and keep model state_dict only
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* remap names to match the ones here
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"""
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import torch
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import torch.nn as nn
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import torch.nn.functional as F
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import numpy as np
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from .registry import register_model
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from .helpers import load_pretrained
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from .layers import SelectAdaptivePool2d, AvgPool2dSame, ConvBnAct, SEModule
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from timm.data import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
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def _mcfg(**kwargs):
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cfg = dict(se_ratio=0., bottle_ratio=1., stem_width=32)
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cfg.update(**kwargs)
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return cfg
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# Model FLOPS = three trailing digits * 10^8
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model_cfgs = dict(
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x_002=_mcfg(w0=24, wa=36.44, wm=2.49, group_w=8, depth=13),
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x_004=_mcfg(w0=24, wa=24.48, wm=2.54, group_w=16, depth=22),
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x_006=_mcfg(w0=48, wa=36.97, wm=2.24, group_w=24, depth=16),
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x_008=_mcfg(w0=56, wa=35.73, wm=2.28, group_w=16, depth=16),
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x_016=_mcfg(w0=80, wa=34.01, wm=2.25, group_w=24, depth=18),
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x_032=_mcfg(w0=88, wa=26.31, wm=2.25, group_w=48, depth=25),
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x_040=_mcfg(w0=96, wa=38.65, wm=2.43, group_w=40, depth=23),
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x_064=_mcfg(w0=184, wa=60.83, wm=2.07, group_w=56, depth=17),
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x_080=_mcfg(w0=80, wa=49.56, wm=2.88, group_w=120, depth=23),
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x_120=_mcfg(w0=168, wa=73.36, wm=2.37, group_w=112, depth=19),
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x_160=_mcfg(w0=216, wa=55.59, wm=2.1, group_w=128, depth=22),
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x_320=_mcfg(w0=320, wa=69.86, wm=2.0, group_w=168, depth=23),
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y_002=_mcfg(w0=24, wa=36.44, wm=2.49, group_w=8, depth=13, se_ratio=0.25),
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y_004=_mcfg(w0=48, wa=27.89, wm=2.09, group_w=8, depth=16, se_ratio=0.25),
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y_006=_mcfg(w0=48, wa=32.54, wm=2.32, group_w=16, depth=15, se_ratio=0.25),
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y_008=_mcfg(w0=56, wa=38.84, wm=2.4, group_w=16, depth=14, se_ratio=0.25),
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y_016=_mcfg(w0=48, wa=20.71, wm=2.65, group_w=24, depth=27, se_ratio=0.25),
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y_032=_mcfg(w0=80, wa=42.63, wm=2.66, group_w=24, depth=21, se_ratio=0.25),
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y_040=_mcfg(w0=96, wa=31.41, wm=2.24, group_w=64, depth=22, se_ratio=0.25),
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y_064=_mcfg(w0=112, wa=33.22, wm=2.27, group_w=72, depth=25, se_ratio=0.25),
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y_080=_mcfg(w0=192, wa=76.82, wm=2.19, group_w=56, depth=17, se_ratio=0.25),
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y_120=_mcfg(w0=168, wa=73.36, wm=2.37, group_w=112, depth=19, se_ratio=0.25),
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y_160=_mcfg(w0=200, wa=106.23, wm=2.48, group_w=112, depth=18, se_ratio=0.25),
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y_320=_mcfg(w0=232, wa=115.89, wm=2.53, group_w=232, depth=20, se_ratio=0.25),
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)
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def _cfg(url=''):
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return {
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'url': url, 'num_classes': 1000, 'input_size': (3, 224, 224), 'pool_size': (7, 7),
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'crop_pct': 0.875, 'interpolation': 'bicubic',
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'mean': IMAGENET_DEFAULT_MEAN, 'std': IMAGENET_DEFAULT_STD,
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'first_conv': 'stem.conv', 'classifier': 'head.fc',
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}
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default_cfgs = dict(
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x_002=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_002-e7e85e5c.pth'),
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x_004=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_004-7d0e9424.pth'),
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x_006=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_006-85ec1baa.pth'),
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x_008=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_008-d8b470eb.pth'),
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x_016=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_016-65ca972a.pth'),
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x_032=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_032-ed0c7f7e.pth'),
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x_040=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_040-73c2a654.pth'),
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x_064=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_064-29278baa.pth'),
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x_080=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_080-7c7fcab1.pth'),
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x_120=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_120-65d5521e.pth'),
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x_160=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_160-c98c4112.pth'),
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x_320=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnetx_320-8ea38b93.pth'),
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y_002=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_002-e68ca334.pth'),
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y_004=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_004-0db870e6.pth'),
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y_006=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_006-c67e57ec.pth'),
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y_008=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_008-dc900dbe.pth'),
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y_016=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_016-54367f74.pth'),
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y_032=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_032-62b47782.pth'),
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y_040=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_040-f0d569f9.pth'),
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y_064=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_064-0a48325c.pth'),
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y_080=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_080-e7f3eb93.pth'),
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y_120=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_120-721ba79a.pth'),
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y_160=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_160-d64013cd.pth'),
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y_320=_cfg(url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-regnet/regnety_320-ba464b29.pth'),
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)
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def quantize_float(f, q):
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"""Converts a float to closest non-zero int divisible by q."""
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return int(round(f / q) * q)
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def adjust_widths_groups_comp(widths, bottle_ratios, groups):
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"""Adjusts the compatibility of widths and groups."""
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bottleneck_widths = [int(w * b) for w, b in zip(widths, bottle_ratios)]
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groups = [min(g, w_bot) for g, w_bot in zip(groups, bottleneck_widths)]
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bottleneck_widths = [quantize_float(w_bot, g) for w_bot, g in zip(bottleneck_widths, groups)]
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widths = [int(w_bot / b) for w_bot, b in zip(bottleneck_widths, bottle_ratios)]
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return widths, groups
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def generate_regnet(width_slope, width_initial, width_mult, depth, q=8):
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"""Generates per block widths from RegNet parameters."""
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assert width_slope >= 0 and width_initial > 0 and width_mult > 1 and width_initial % q == 0
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widths_cont = np.arange(depth) * width_slope + width_initial
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width_exps = np.round(np.log(widths_cont / width_initial) / np.log(width_mult))
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widths = width_initial * np.power(width_mult, width_exps)
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widths = np.round(np.divide(widths, q)) * q
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num_stages, max_stage = len(np.unique(widths)), width_exps.max() + 1
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widths, widths_cont = widths.astype(int).tolist(), widths_cont.tolist()
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return widths, num_stages, max_stage, widths_cont
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class Bottleneck(nn.Module):
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""" RegNet Bottleneck
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This is almost exactly the same as a ResNet Bottlneck. The main difference is the SE block is moved from
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after conv3 to after conv2. Otherwise, it's just redefining the arguments for groups/bottleneck channels.
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"""
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def __init__(self, in_chs, out_chs, stride=1, bottleneck_ratio=1, group_width=1, se_ratio=0.25,
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dilation=1, first_dilation=None, downsample=None, act_layer=nn.ReLU, norm_layer=nn.BatchNorm2d,
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aa_layer=None, drop_block=None, drop_path=None):
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super(Bottleneck, self).__init__()
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bottleneck_chs = int(round(out_chs * bottleneck_ratio))
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groups = bottleneck_chs // group_width
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first_dilation = first_dilation or dilation
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cargs = dict(act_layer=act_layer, norm_layer=norm_layer, aa_layer=aa_layer, drop_block=drop_block)
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self.conv1 = ConvBnAct(in_chs, bottleneck_chs, kernel_size=1, **cargs)
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self.conv2 = ConvBnAct(
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bottleneck_chs, bottleneck_chs, kernel_size=3, stride=stride, dilation=first_dilation,
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groups=groups, **cargs)
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if se_ratio:
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se_channels = int(round(in_chs * se_ratio))
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self.se = SEModule(bottleneck_chs, reduction_channels=se_channels)
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else:
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self.se = None
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cargs['act_layer'] = None
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self.conv3 = ConvBnAct(bottleneck_chs, out_chs, kernel_size=1, **cargs)
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self.act3 = act_layer(inplace=True)
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self.downsample = downsample
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self.drop_path = drop_path
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def zero_init_last_bn(self):
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nn.init.zeros_(self.conv3.bn.weight)
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def forward(self, x):
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shortcut = x
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x = self.conv1(x)
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x = self.conv2(x)
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if self.se is not None:
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x = self.se(x)
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x = self.conv3(x)
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if self.drop_path is not None:
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x = self.drop_path(x)
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if self.downsample is not None:
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shortcut = self.downsample(shortcut)
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x += shortcut
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x = self.act3(x)
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return x
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def downsample_conv(
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in_chs, out_chs, kernel_size, stride=1, dilation=1, first_dilation=None, norm_layer=None):
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norm_layer = norm_layer or nn.BatchNorm2d
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kernel_size = 1 if stride == 1 and dilation == 1 else kernel_size
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first_dilation = (first_dilation or dilation) if kernel_size > 1 else 1
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return ConvBnAct(
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in_chs, out_chs, kernel_size, stride=stride, dilation=first_dilation, norm_layer=norm_layer, act_layer=None)
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def downsample_avg(
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in_chs, out_chs, kernel_size, stride=1, dilation=1, first_dilation=None, norm_layer=None):
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""" AvgPool Downsampling as in 'D' ResNet variants. This is not in RegNet space but I might experiment."""
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norm_layer = norm_layer or nn.BatchNorm2d
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avg_stride = stride if dilation == 1 else 1
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pool = nn.Identity()
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if stride > 1 or dilation > 1:
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avg_pool_fn = AvgPool2dSame if avg_stride == 1 and dilation > 1 else nn.AvgPool2d
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pool = avg_pool_fn(2, avg_stride, ceil_mode=True, count_include_pad=False)
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return nn.Sequential(*[
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pool, ConvBnAct(in_chs, out_chs, 1, stride=1, norm_layer=norm_layer, act_layer=None)])
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class RegStage(nn.Module):
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"""Stage (sequence of blocks w/ the same output shape)."""
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def __init__(self, in_chs, out_chs, stride, depth, block_fn, bottle_ratio, group_width, se_ratio):
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super(RegStage, self).__init__()
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block_kwargs = {} # FIXME setup to pass various aa, norm, act layer common args
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for i in range(depth):
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block_stride = stride if i == 0 else 1
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block_in_chs = in_chs if i == 0 else out_chs
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if (block_in_chs != out_chs) or (block_stride != 1):
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proj_block = downsample_conv(block_in_chs, out_chs, 1, stride)
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else:
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proj_block = None
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name = "b{}".format(i + 1)
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self.add_module(
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name, block_fn(
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block_in_chs, out_chs, block_stride, bottle_ratio, group_width, se_ratio,
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downsample=proj_block, **block_kwargs)
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)
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def forward(self, x):
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for block in self.children():
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x = block(x)
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return x
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class ClassifierHead(nn.Module):
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"""Head."""
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def __init__(self, in_chs, num_classes, pool_type='avg', drop_rate=0.):
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super(ClassifierHead, self).__init__()
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self.drop_rate = drop_rate
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self.global_pool = SelectAdaptivePool2d(pool_type=pool_type)
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if num_classes > 0:
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self.fc = nn.Linear(in_chs, num_classes, bias=True)
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else:
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self.fc = nn.Identity()
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def forward(self, x):
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x = self.global_pool(x).flatten(1)
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if self.drop_rate:
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x = F.dropout(x, p=float(self.drop_rate), training=self.training)
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x = self.fc(x)
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return x
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class RegNet(nn.Module):
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"""RegNet model.
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Paper: https://arxiv.org/abs/2003.13678
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Original Impl: https://github.com/facebookresearch/pycls/blob/master/pycls/models/regnet.py
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"""
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def __init__(self, cfg, in_chans=3, num_classes=1000, global_pool='avg', drop_rate=0.,
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zero_init_last_bn=True):
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super().__init__()
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# TODO add drop block, drop path, anti-aliasing, custom bn/act args
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self.num_classes = num_classes
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self.drop_rate = drop_rate
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# Construct the stem
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stem_width = cfg['stem_width']
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self.stem = ConvBnAct(in_chans, stem_width, 3, stride=2)
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# Construct the stages
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block_fn = Bottleneck
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prev_width = stem_width
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stage_params = self._get_stage_params(cfg)
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se_ratio = cfg['se_ratio']
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for i, (d, w, s, br, gw) in enumerate(stage_params):
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self.add_module(
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"s{}".format(i + 1), RegStage(prev_width, w, s, d, block_fn, br, gw, se_ratio))
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prev_width = w
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# Construct the head
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self.num_features = prev_width
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self.head = ClassifierHead(
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in_chs=prev_width, num_classes=num_classes, pool_type=global_pool, drop_rate=drop_rate)
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for m in self.modules():
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if isinstance(m, nn.Conv2d):
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nn.init.kaiming_normal_(m.weight, mode='fan_out', nonlinearity='relu')
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elif isinstance(m, nn.BatchNorm2d):
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nn.init.ones_(m.weight)
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nn.init.zeros_(m.bias)
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elif isinstance(m, nn.Linear):
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nn.init.normal_(m.weight, mean=0.0, std=0.01)
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nn.init.zeros_(m.bias)
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if zero_init_last_bn:
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for m in self.modules():
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if hasattr(m, 'zero_init_last_bn'):
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m.zero_init_last_bn()
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def _get_stage_params(self, cfg, stride=2):
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# Generate RegNet ws per block
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w_a, w_0, w_m, d = cfg['wa'], cfg['w0'], cfg['wm'], cfg['depth']
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widths, num_stages, _, _ = generate_regnet(w_a, w_0, w_m, d)
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# Convert to per stage format
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stage_widths, stage_depths = np.unique(widths, return_counts=True)
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# Use the same group width, bottleneck mult and stride for each stage
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stage_groups = [cfg['group_w'] for _ in range(num_stages)]
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stage_bottle_ratios = [cfg['bottle_ratio'] for _ in range(num_stages)]
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stage_strides = [stride for _ in range(num_stages)]
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# FIXME add dilation / output_stride support
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# Adjust the compatibility of ws and gws
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stage_widths, stage_groups = adjust_widths_groups_comp(stage_widths, stage_bottle_ratios, stage_groups)
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stage_params = list(zip(stage_depths, stage_widths, stage_strides, stage_bottle_ratios, stage_groups))
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return stage_params
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def get_classifier(self):
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return self.head.fc
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def reset_classifier(self, num_classes, global_pool='avg'):
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self.head = ClassifierHead(self.num_features, num_classes, pool_type=global_pool, drop_rate=self.drop_rate)
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def forward_features(self, x):
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for block in list(self.children())[:-1]:
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x = block(x)
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return x
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def forward(self, x):
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for block in self.children():
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x = block(x)
|
||||
return x
|
||||
|
||||
|
||||
def _regnet(variant, pretrained, **kwargs):
|
||||
load_strict = True
|
||||
model_class = RegNet
|
||||
if kwargs.pop('features_only', False):
|
||||
assert False, 'Not Implemented' # TODO
|
||||
load_strict = False
|
||||
kwargs.pop('num_classes', 0)
|
||||
model_cfg = model_cfgs[variant]
|
||||
default_cfg = default_cfgs[variant]
|
||||
model = model_class(model_cfg, **kwargs)
|
||||
model.default_cfg = default_cfg
|
||||
if pretrained:
|
||||
load_pretrained(
|
||||
model, default_cfg,
|
||||
num_classes=kwargs.get('num_classes', 0), in_chans=kwargs.get('in_chans', 3), strict=load_strict)
|
||||
return model
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_002(pretrained=False, **kwargs):
|
||||
"""RegNetX-200MF"""
|
||||
return _regnet('x_002', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_004(pretrained=False, **kwargs):
|
||||
"""RegNetX-400MF"""
|
||||
return _regnet('x_004', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_006(pretrained=False, **kwargs):
|
||||
"""RegNetX-600MF"""
|
||||
return _regnet('x_006', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_008(pretrained=False, **kwargs):
|
||||
"""RegNetX-800MF"""
|
||||
return _regnet('x_008', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_016(pretrained=False, **kwargs):
|
||||
"""RegNetX-1.6GF"""
|
||||
return _regnet('x_016', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_032(pretrained=False, **kwargs):
|
||||
"""RegNetX-3.2GF"""
|
||||
return _regnet('x_032', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_040(pretrained=False, **kwargs):
|
||||
"""RegNetX-4.0GF"""
|
||||
return _regnet('x_040', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_064(pretrained=False, **kwargs):
|
||||
"""RegNetX-6.4GF"""
|
||||
return _regnet('x_064', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_080(pretrained=False, **kwargs):
|
||||
"""RegNetX-8.0GF"""
|
||||
return _regnet('x_080', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_120(pretrained=False, **kwargs):
|
||||
"""RegNetX-12GF"""
|
||||
return _regnet('x_120', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_160(pretrained=False, **kwargs):
|
||||
"""RegNetX-16GF"""
|
||||
return _regnet('x_160', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnetx_320(pretrained=False, **kwargs):
|
||||
"""RegNetX-32GF"""
|
||||
return _regnet('x_320', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_002(pretrained=False, **kwargs):
|
||||
"""RegNetY-200MF"""
|
||||
return _regnet('y_002', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_004(pretrained=False, **kwargs):
|
||||
"""RegNetY-400MF"""
|
||||
return _regnet('y_004', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_006(pretrained=False, **kwargs):
|
||||
"""RegNetY-600MF"""
|
||||
return _regnet('y_006', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_008(pretrained=False, **kwargs):
|
||||
"""RegNetY-800MF"""
|
||||
return _regnet('y_008', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_016(pretrained=False, **kwargs):
|
||||
"""RegNetY-1.6GF"""
|
||||
return _regnet('y_016', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_032(pretrained=False, **kwargs):
|
||||
"""RegNetY-3.2GF"""
|
||||
return _regnet('y_032', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_040(pretrained=False, **kwargs):
|
||||
"""RegNetY-4.0GF"""
|
||||
return _regnet('y_040', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_064(pretrained=False, **kwargs):
|
||||
"""RegNetY-6.4GF"""
|
||||
return _regnet('y_064', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_080(pretrained=False, **kwargs):
|
||||
"""RegNetY-8.0GF"""
|
||||
return _regnet('y_080', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_120(pretrained=False, **kwargs):
|
||||
"""RegNetY-12GF"""
|
||||
return _regnet('y_120', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_160(pretrained=False, **kwargs):
|
||||
"""RegNetY-16GF"""
|
||||
return _regnet('y_160', pretrained, **kwargs)
|
||||
|
||||
|
||||
@register_model
|
||||
def regnety_320(pretrained=False, **kwargs):
|
||||
"""RegNetY-32GF"""
|
||||
return _regnet('y_320', pretrained, **kwargs)
|
||||
Loading…
Reference in new issue