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415 lines
15 KiB
415 lines
15 KiB
5 months ago
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from functools import partial
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from typing import Any, Callable, List, Optional, Sequence
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import torch
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from torch import nn, Tensor
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from torch.nn import functional as F
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from ..ops.misc import Conv2dNormActivation, Permute
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from ..ops.stochastic_depth import StochasticDepth
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from ..transforms._presets import ImageClassification
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from ..utils import _log_api_usage_once
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from ._api import register_model, Weights, WeightsEnum
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from ._meta import _IMAGENET_CATEGORIES
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from ._utils import _ovewrite_named_param, handle_legacy_interface
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__all__ = [
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"ConvNeXt",
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"ConvNeXt_Tiny_Weights",
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"ConvNeXt_Small_Weights",
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"ConvNeXt_Base_Weights",
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"ConvNeXt_Large_Weights",
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"convnext_tiny",
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"convnext_small",
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"convnext_base",
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"convnext_large",
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]
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class LayerNorm2d(nn.LayerNorm):
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def forward(self, x: Tensor) -> Tensor:
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x = x.permute(0, 2, 3, 1)
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x = F.layer_norm(x, self.normalized_shape, self.weight, self.bias, self.eps)
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x = x.permute(0, 3, 1, 2)
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return x
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class CNBlock(nn.Module):
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def __init__(
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self,
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dim,
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layer_scale: float,
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stochastic_depth_prob: float,
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norm_layer: Optional[Callable[..., nn.Module]] = None,
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) -> None:
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super().__init__()
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if norm_layer is None:
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norm_layer = partial(nn.LayerNorm, eps=1e-6)
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self.block = nn.Sequential(
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nn.Conv2d(dim, dim, kernel_size=7, padding=3, groups=dim, bias=True),
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Permute([0, 2, 3, 1]),
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norm_layer(dim),
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nn.Linear(in_features=dim, out_features=4 * dim, bias=True),
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nn.GELU(),
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nn.Linear(in_features=4 * dim, out_features=dim, bias=True),
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Permute([0, 3, 1, 2]),
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)
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self.layer_scale = nn.Parameter(torch.ones(dim, 1, 1) * layer_scale)
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self.stochastic_depth = StochasticDepth(stochastic_depth_prob, "row")
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def forward(self, input: Tensor) -> Tensor:
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result = self.layer_scale * self.block(input)
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result = self.stochastic_depth(result)
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result += input
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return result
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class CNBlockConfig:
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# Stores information listed at Section 3 of the ConvNeXt paper
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def __init__(
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self,
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input_channels: int,
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out_channels: Optional[int],
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num_layers: int,
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) -> None:
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self.input_channels = input_channels
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self.out_channels = out_channels
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self.num_layers = num_layers
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def __repr__(self) -> str:
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s = self.__class__.__name__ + "("
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s += "input_channels={input_channels}"
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s += ", out_channels={out_channels}"
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s += ", num_layers={num_layers}"
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s += ")"
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return s.format(**self.__dict__)
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class ConvNeXt(nn.Module):
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def __init__(
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self,
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block_setting: List[CNBlockConfig],
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stochastic_depth_prob: float = 0.0,
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layer_scale: float = 1e-6,
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num_classes: int = 1000,
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block: Optional[Callable[..., nn.Module]] = None,
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norm_layer: Optional[Callable[..., nn.Module]] = None,
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**kwargs: Any,
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) -> None:
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super().__init__()
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_log_api_usage_once(self)
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if not block_setting:
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raise ValueError("The block_setting should not be empty")
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elif not (isinstance(block_setting, Sequence) and all([isinstance(s, CNBlockConfig) for s in block_setting])):
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raise TypeError("The block_setting should be List[CNBlockConfig]")
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if block is None:
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block = CNBlock
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if norm_layer is None:
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norm_layer = partial(LayerNorm2d, eps=1e-6)
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layers: List[nn.Module] = []
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# Stem
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firstconv_output_channels = block_setting[0].input_channels
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layers.append(
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Conv2dNormActivation(
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3,
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firstconv_output_channels,
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kernel_size=4,
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stride=4,
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padding=0,
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norm_layer=norm_layer,
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activation_layer=None,
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bias=True,
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)
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)
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total_stage_blocks = sum(cnf.num_layers for cnf in block_setting)
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stage_block_id = 0
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for cnf in block_setting:
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# Bottlenecks
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stage: List[nn.Module] = []
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for _ in range(cnf.num_layers):
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# adjust stochastic depth probability based on the depth of the stage block
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sd_prob = stochastic_depth_prob * stage_block_id / (total_stage_blocks - 1.0)
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stage.append(block(cnf.input_channels, layer_scale, sd_prob))
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stage_block_id += 1
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layers.append(nn.Sequential(*stage))
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if cnf.out_channels is not None:
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# Downsampling
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layers.append(
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nn.Sequential(
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norm_layer(cnf.input_channels),
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nn.Conv2d(cnf.input_channels, cnf.out_channels, kernel_size=2, stride=2),
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)
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)
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self.features = nn.Sequential(*layers)
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self.avgpool = nn.AdaptiveAvgPool2d(1)
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lastblock = block_setting[-1]
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lastconv_output_channels = (
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lastblock.out_channels if lastblock.out_channels is not None else lastblock.input_channels
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)
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self.classifier = nn.Sequential(
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norm_layer(lastconv_output_channels), nn.Flatten(1), nn.Linear(lastconv_output_channels, num_classes)
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)
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for m in self.modules():
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if isinstance(m, (nn.Conv2d, nn.Linear)):
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nn.init.trunc_normal_(m.weight, std=0.02)
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if m.bias is not None:
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nn.init.zeros_(m.bias)
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def _forward_impl(self, x: Tensor) -> Tensor:
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x = self.features(x)
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x = self.avgpool(x)
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x = self.classifier(x)
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return x
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def forward(self, x: Tensor) -> Tensor:
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return self._forward_impl(x)
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def _convnext(
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block_setting: List[CNBlockConfig],
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stochastic_depth_prob: float,
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weights: Optional[WeightsEnum],
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progress: bool,
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**kwargs: Any,
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) -> ConvNeXt:
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if weights is not None:
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_ovewrite_named_param(kwargs, "num_classes", len(weights.meta["categories"]))
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model = ConvNeXt(block_setting, stochastic_depth_prob=stochastic_depth_prob, **kwargs)
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if weights is not None:
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model.load_state_dict(weights.get_state_dict(progress=progress, check_hash=True))
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return model
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_COMMON_META = {
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"min_size": (32, 32),
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"categories": _IMAGENET_CATEGORIES,
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"recipe": "https://github.com/pytorch/vision/tree/main/references/classification#convnext",
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"_docs": """
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These weights improve upon the results of the original paper by using a modified version of TorchVision's
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`new training recipe
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<https://pytorch.org/blog/how-to-train-state-of-the-art-models-using-torchvision-latest-primitives/>`_.
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""",
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}
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class ConvNeXt_Tiny_Weights(WeightsEnum):
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IMAGENET1K_V1 = Weights(
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url="https://download.pytorch.org/models/convnext_tiny-983f1562.pth",
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transforms=partial(ImageClassification, crop_size=224, resize_size=236),
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meta={
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**_COMMON_META,
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"num_params": 28589128,
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"_metrics": {
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"ImageNet-1K": {
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"acc@1": 82.520,
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"acc@5": 96.146,
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}
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},
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"_ops": 4.456,
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"_file_size": 109.119,
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},
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)
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DEFAULT = IMAGENET1K_V1
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class ConvNeXt_Small_Weights(WeightsEnum):
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IMAGENET1K_V1 = Weights(
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url="https://download.pytorch.org/models/convnext_small-0c510722.pth",
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transforms=partial(ImageClassification, crop_size=224, resize_size=230),
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meta={
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**_COMMON_META,
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"num_params": 50223688,
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"_metrics": {
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"ImageNet-1K": {
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"acc@1": 83.616,
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"acc@5": 96.650,
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}
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},
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"_ops": 8.684,
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"_file_size": 191.703,
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},
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)
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DEFAULT = IMAGENET1K_V1
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class ConvNeXt_Base_Weights(WeightsEnum):
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IMAGENET1K_V1 = Weights(
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url="https://download.pytorch.org/models/convnext_base-6075fbad.pth",
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transforms=partial(ImageClassification, crop_size=224, resize_size=232),
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meta={
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**_COMMON_META,
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"num_params": 88591464,
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"_metrics": {
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"ImageNet-1K": {
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"acc@1": 84.062,
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"acc@5": 96.870,
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}
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},
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"_ops": 15.355,
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"_file_size": 338.064,
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},
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)
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DEFAULT = IMAGENET1K_V1
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class ConvNeXt_Large_Weights(WeightsEnum):
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IMAGENET1K_V1 = Weights(
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url="https://download.pytorch.org/models/convnext_large-ea097f82.pth",
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transforms=partial(ImageClassification, crop_size=224, resize_size=232),
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meta={
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**_COMMON_META,
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"num_params": 197767336,
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"_metrics": {
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"ImageNet-1K": {
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"acc@1": 84.414,
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"acc@5": 96.976,
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}
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},
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"_ops": 34.361,
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"_file_size": 754.537,
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},
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)
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DEFAULT = IMAGENET1K_V1
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@register_model()
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@handle_legacy_interface(weights=("pretrained", ConvNeXt_Tiny_Weights.IMAGENET1K_V1))
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def convnext_tiny(*, weights: Optional[ConvNeXt_Tiny_Weights] = None, progress: bool = True, **kwargs: Any) -> ConvNeXt:
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"""ConvNeXt Tiny model architecture from the
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`A ConvNet for the 2020s <https://arxiv.org/abs/2201.03545>`_ paper.
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Args:
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weights (:class:`~torchvision.models.convnext.ConvNeXt_Tiny_Weights`, optional): The pretrained
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weights to use. See :class:`~torchvision.models.convnext.ConvNeXt_Tiny_Weights`
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below for more details and possible values. By default, no pre-trained weights are used.
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progress (bool, optional): If True, displays a progress bar of the download to stderr. Default is True.
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**kwargs: parameters passed to the ``torchvision.models.convnext.ConvNext``
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base class. Please refer to the `source code
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<https://github.com/pytorch/vision/blob/main/torchvision/models/convnext.py>`_
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for more details about this class.
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.. autoclass:: torchvision.models.ConvNeXt_Tiny_Weights
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:members:
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"""
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weights = ConvNeXt_Tiny_Weights.verify(weights)
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block_setting = [
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CNBlockConfig(96, 192, 3),
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CNBlockConfig(192, 384, 3),
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CNBlockConfig(384, 768, 9),
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CNBlockConfig(768, None, 3),
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]
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stochastic_depth_prob = kwargs.pop("stochastic_depth_prob", 0.1)
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return _convnext(block_setting, stochastic_depth_prob, weights, progress, **kwargs)
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@register_model()
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@handle_legacy_interface(weights=("pretrained", ConvNeXt_Small_Weights.IMAGENET1K_V1))
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def convnext_small(
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*, weights: Optional[ConvNeXt_Small_Weights] = None, progress: bool = True, **kwargs: Any
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) -> ConvNeXt:
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"""ConvNeXt Small model architecture from the
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`A ConvNet for the 2020s <https://arxiv.org/abs/2201.03545>`_ paper.
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Args:
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weights (:class:`~torchvision.models.convnext.ConvNeXt_Small_Weights`, optional): The pretrained
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weights to use. See :class:`~torchvision.models.convnext.ConvNeXt_Small_Weights`
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below for more details and possible values. By default, no pre-trained weights are used.
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progress (bool, optional): If True, displays a progress bar of the download to stderr. Default is True.
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**kwargs: parameters passed to the ``torchvision.models.convnext.ConvNext``
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base class. Please refer to the `source code
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<https://github.com/pytorch/vision/blob/main/torchvision/models/convnext.py>`_
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for more details about this class.
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.. autoclass:: torchvision.models.ConvNeXt_Small_Weights
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:members:
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"""
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weights = ConvNeXt_Small_Weights.verify(weights)
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block_setting = [
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CNBlockConfig(96, 192, 3),
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CNBlockConfig(192, 384, 3),
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CNBlockConfig(384, 768, 27),
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CNBlockConfig(768, None, 3),
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]
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stochastic_depth_prob = kwargs.pop("stochastic_depth_prob", 0.4)
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return _convnext(block_setting, stochastic_depth_prob, weights, progress, **kwargs)
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@register_model()
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@handle_legacy_interface(weights=("pretrained", ConvNeXt_Base_Weights.IMAGENET1K_V1))
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def convnext_base(*, weights: Optional[ConvNeXt_Base_Weights] = None, progress: bool = True, **kwargs: Any) -> ConvNeXt:
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"""ConvNeXt Base model architecture from the
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`A ConvNet for the 2020s <https://arxiv.org/abs/2201.03545>`_ paper.
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Args:
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weights (:class:`~torchvision.models.convnext.ConvNeXt_Base_Weights`, optional): The pretrained
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weights to use. See :class:`~torchvision.models.convnext.ConvNeXt_Base_Weights`
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below for more details and possible values. By default, no pre-trained weights are used.
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progress (bool, optional): If True, displays a progress bar of the download to stderr. Default is True.
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**kwargs: parameters passed to the ``torchvision.models.convnext.ConvNext``
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base class. Please refer to the `source code
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<https://github.com/pytorch/vision/blob/main/torchvision/models/convnext.py>`_
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for more details about this class.
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.. autoclass:: torchvision.models.ConvNeXt_Base_Weights
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:members:
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"""
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weights = ConvNeXt_Base_Weights.verify(weights)
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block_setting = [
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CNBlockConfig(128, 256, 3),
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CNBlockConfig(256, 512, 3),
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CNBlockConfig(512, 1024, 27),
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CNBlockConfig(1024, None, 3),
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]
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stochastic_depth_prob = kwargs.pop("stochastic_depth_prob", 0.5)
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return _convnext(block_setting, stochastic_depth_prob, weights, progress, **kwargs)
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@register_model()
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@handle_legacy_interface(weights=("pretrained", ConvNeXt_Large_Weights.IMAGENET1K_V1))
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def convnext_large(
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*, weights: Optional[ConvNeXt_Large_Weights] = None, progress: bool = True, **kwargs: Any
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) -> ConvNeXt:
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"""ConvNeXt Large model architecture from the
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`A ConvNet for the 2020s <https://arxiv.org/abs/2201.03545>`_ paper.
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Args:
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weights (:class:`~torchvision.models.convnext.ConvNeXt_Large_Weights`, optional): The pretrained
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weights to use. See :class:`~torchvision.models.convnext.ConvNeXt_Large_Weights`
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below for more details and possible values. By default, no pre-trained weights are used.
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progress (bool, optional): If True, displays a progress bar of the download to stderr. Default is True.
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**kwargs: parameters passed to the ``torchvision.models.convnext.ConvNext``
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base class. Please refer to the `source code
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<https://github.com/pytorch/vision/blob/main/torchvision/models/convnext.py>`_
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for more details about this class.
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.. autoclass:: torchvision.models.ConvNeXt_Large_Weights
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:members:
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"""
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weights = ConvNeXt_Large_Weights.verify(weights)
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block_setting = [
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CNBlockConfig(192, 384, 3),
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CNBlockConfig(384, 768, 3),
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CNBlockConfig(768, 1536, 27),
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CNBlockConfig(1536, None, 3),
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]
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stochastic_depth_prob = kwargs.pop("stochastic_depth_prob", 0.5)
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return _convnext(block_setting, stochastic_depth_prob, weights, progress, **kwargs)
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