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import torch
from timm.models import ConvNeXt
from timm.data.constants import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
from torch.nn import functional as F
class ConvNeXtDiscriminator:
def __init__(self, model: ConvNeXt, input_size: int) -> None:
self.net = model
self.input_size = input_size
self.img_mean = torch.tensor(IMAGENET_DEFAULT_MEAN).view(1, -1, 1, 1)
self.img_std = torch.tensor(IMAGENET_DEFAULT_STD).view(1, -1, 1, 1)
def get_score(self, img):
pred = self.get_all(img)
return torch.softmax(pred, dim=-1)[:, 1]
def get_all(self, img):
img_mean = self.img_mean.to(device=img.device, dtype=img.dtype)
img_std = self.img_std.to(device=img.device, dtype=img.dtype)
img = ((img + 1.0) / 2.0).sub(img_mean).div(img_std)
img = F.interpolate(
img,
size=(self.input_size, self.input_size),
mode="bicubic",
align_corners=True,
)
pred = self.net(img)
return pred
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