You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sift.rs
    path of file: ./repos/anansi/embedds/lib/retrieval/src/utils
    
    the code of the file until where you have to start completion: use std::collections::HashMap;
use std::fs;
use std::io::Cursor;
use std::path::Path;

use byteorder::{BigEndian, ByteOrder};
use byteorder::{LittleEndian, ReadBytesE
    
    pub fn fetch_vectors(&self, filename: &str) -> anyhow::Result<Vec<f32>> {
        let path = self.directory.join(filename);
        let data_r = fs::read(path)?;
        let data_r_slice = data_r.as_slice();

        let num_vectors = data_r.len() / (4 + self.dims * 4);
        let mut data_w: Vec<f32> = Vec::with_capacity(num_vectors * self.dims);
        let mut rdr = Cursor::new(data_r_slice);
        for _i in 0..num_vectors {
            // we *must* make a read for the dimensionality first before reading out
            // the components of the vectors themselves
            let dim = rdr.read_u32::<LittleEndian>().unwrap();
            // if dim != self.dims.try_into()? {
            //     panic!("dim mismatch while reading the source data");
            // }
            for _j in 0..dim {
                data_w.push(rdr.read_f32::<LittleEndian>().unwrap());
            }
        }
        Ok(data_w)
    }