self.encoder.fc in builder.py

[MSutharsan]

Projectors are defined in builder.py as follows:

 self.encoder.fc = nn.Sequential(nn.Linear(prev_dim, prev_dim, bias=False),
                                        nn.BatchNorm1d(prev_dim),
                                        nn.ReLU(inplace=True), # first layer
                                        nn.Linear(prev_dim, prev_dim, bias=False),
                                        nn.BatchNorm1d(prev_dim),
                                        nn.ReLU(inplace=True), # second layer
                                        self.encoder.fc,
                                        nn.BatchNorm1d(dim, affine=False))

What is the purpose of adding "self.encoder.fc" within nn.Sequential?