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"""Barlow Twins network."""
from typing import Type
from torch import nn, Tensor
import torch.nn.functional as F
class BarlowTwins(nn.Module):
def __init__(self, encoder: Type[nn.Module], projector: Type[nn.Module]) -> None:
super().__init__()
self.encoder = encoder
self.projector = projector
def forward(self, x: Tensor) -> Tensor:
z = self.encoder(x)
z_e = F.adaptive_avg_pool2d(z, (1, 1)).flatten(start_dim=1)
z_p = self.projector(z_e)
return z_p
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