import torch.nn as nn
import torch.nn.functional as F


class SimpleClassifier(nn.Module):
    def __init__(self, embedding_dim=768):
        super().__init__()
        self.layernorm = nn.LayerNorm(embedding_dim)
        self.linear = nn.Linear(embedding_dim, 1, bias=True)

    def forward(self, x):
        return F.sigmoid(self.linear(self.layernorm(x)))