removed unused imports

Author: YertleTurtleGit

src/graph_pca_lib.rs

@@ -1,7 +1,5 @@
 use kdtree::{distance::squared_euclidean, KdTree};
 use nalgebra::{DMatrix, SymmetricEigen};
-use petgraph::algo::dijkstra;
-use petgraph::graph::{NodeIndex, UnGraph};
 use pyo3::prelude::*;
 use rayon::prelude::*;
 use std::vec::Vec;