Ансамбль деревьев

function predictor_association(trees, X)
    n_features = size(X, 2)
    n_trees = length(trees)
    association = zeros(n_features, n_features)
    
    for i in 1:n_features
        association[i, i] = 1.0
    end
    
    for i in 1:n_features
        for j in i+1:n_features
            valid_idx = .!any(isnan, X[:, [i, j]]; dims=2)[:]
            if sum(valid_idx) > 2
                cor_val = abs(cor(X[valid_idx, i], X[valid_idx, j]))
                association[i, j] = cor_val
                association[j, i] = cor_val
            end
        end
    end
    
    return association
end