How to include correlation among parameter vectors in the cost function?

Question

I have the following model:

class Model(nn.Module):
    def __init__(self, dim_in, lambda_=.3):
        super(FeatExtractorGR, self).__init__()

       '''The linear transform layer'''
        self.lt = nn.Linear(in_features = dim_in, out_features = 10, bias=True)
    
    '''The encoder'''
    self.feature_extractor = \
        nn.Sequential(
            #nn.Linear(in_features = 10, out_features = 30, bias=True),
            nn.BatchNorm1d(10),
            nn.ReLU(),
            nn.Linear(in_features = 10, out_features = 20, bias=True),
            nn.BatchNorm1d(20),
            nn.ReLU(),
            nn.Linear(in_features = 20, out_features = 10, bias=True),
            nn.BatchNorm1d(10),
            nn.ReLU()
        )

def forward(self, x):
    transformed = self.lt(x)
    return self.feature_extractor(transformed)

I want to force the weight vectors of the linear transformation layer to be uncorrelated. I tried to include the dot products among the vectors in the cost function:

        params=list(model.lt.parameters())[0]
        dotprod=torch.tensordot(params, params, dims=([1],[1])).abs().fill_diagonal_(0).sum()/2

        loss = other_losses + dotprod * weight

But this is not working, even with really high weight. The weight vectors from the lt layer are still highly correlated. I have also tried to remove other_losses, but no effect. What am I doing wrong?