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: dataset.rs
    path of file: ./repos/burn/examples/custom-csv-dataset/src
    
    the code of the file until where you have to start completion: use burn::data::dataset::{Dataset, InMemDataset};
use serde::{Deserialize, Serialize};
use std::{
    fs::File,
    io::copy,
    path::{Path, PathBuf},
};

/// Diabetes patient record.
/// For each field, we manually specify the expected header 
    
    pub fn new() -> Result<Self, std::io::Error> {
        // Download dataset csv file
        let path = DiabetesDataset::download();

        // Build dataset from csv with tab ('\t') delimiter
        let mut rdr = csv::ReaderBuilder::new();
        let rdr = rdr.delimiter(b'\t');

        let dataset = InMemDataset::from_csv(path, rdr).unwrap();

        let dataset = Self { dataset };

        Ok(dataset)
    }