dense 2.0.0

An encoder/decoder to/from dense files.
Documentation 
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# Dense


[![Crates.io](https://img.shields.io/crates/v/dense)](https://crates.io/crates/dense)
[![lib.rs.io](https://img.shields.io/crates/v/dense?color=blue&label=lib.rs)](https://lib.rs/crates/dense)
[![docs](https://img.shields.io/crates/v/dense?color=yellow&label=docs)](https://docs.rs/dense)

An encoder/decoder to/from dense files.

A file format simpler and denser than MNIST, a dense file is binary file of sequential training examples and nothing else (example->label->example->label->etc.).

#### MNIST Testing data
Format | Size | Size on disk
--- | --- | ---
MNIST | 7,850,024 | 7,856,128
Dense | 7,850,000 | 7,852,032

#### Example
```rust
use ndarray::{Array2,array};

let data: Array2<u8> = array![[0, 0], [1, 0], [0, 1], [1, 1]];
let labels: Array2<u16> = array![[0], [1], [1], [0]];

dense::write("dense_reader",&data,&labels).unwrap();

let (read_data,read_labels) = dense::read::<u8,u16>("dense_reader",2).unwrap();

assert_eq!(read_data,data);
assert_eq!(read_labels,labels);
```