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Source file owl_dataset.ml

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# 1 "src/owl/misc/owl_dataset.ml"
(*
 * OWL - OCaml Scientific and Engineering Computing
 * Copyright (c) 2016-2020 Liang Wang <liang.wang@cl.cam.ac.uk>
 *)

(** Dataset: easy access to various datasets *)

open Owl_types

let remote_data_path () = "https://github.com/ryanrhymes/owl_dataset/raw/master/"

let local_data_path () : string =
  let home = Sys.getenv "HOME" ^ "/.owl" in
  let d = home ^ "/dataset" in
  Owl_log.info "create %s if not present" d;
  (* Note: use of Sys.file_exist is racy *)
  (try Unix.mkdir home 0o755 with
  | Unix.Unix_error (EEXIST, _, _) -> ());
  (try Unix.mkdir d 0o755 with
  | Unix.Unix_error (EEXIST, _, _) -> ());
  d


let download_data fname =
  let fn0 = remote_data_path () ^ fname in
  let fn1 = local_data_path () ^ fname in
  let cmd0 = "wget " ^ fn0 ^ " -O " ^ fn1 in
  let cmd1 = "gunzip " ^ fn1 in
  ignore (Sys.command cmd0);
  ignore (Sys.command cmd1)


let download_all () =
  let l =
    [ "stopwords.txt.gz"
    ; "enron.test.gz"
    ; "enron.train.gz"
    ; "nips.test.gz"
    ; "nips.train.gz"
    ; "mnist-test-images.gz"
    ; "mnist-test-labels.gz"
    ; "mnist-test-lblvec.gz"
    ; "mnist-train-images.gz"
    ; "mnist-train-labels.gz"
    ; "mnist-train-lblvec.gz"
    ; "cifar10_test_data.gz"
    ; "cifar10_test_labels.gz"
    ; "cifar10_test_filenames.gz"
    ; "cifar10_test_lblvec.gz"
    ; "cifar10_train1_data.gz"
    ; "cifar10_train1_labels.gz"
    ; "cifar10_train1_filenames.gz"
    ; "cifar10_train1_lblvec.gz"
    ; "cifar10_train2_data.gz"
    ; "cifar10_train2_labels.gz"
    ; "cifar10_train2_filenames.gz"
    ; "cifar10_train2_lblvec.gz"
    ; "cifar10_train3_data.gz"
    ; "cifar10_train3_labels.gz"
    ; "cifar10_train3_filenames.gz"
    ; "cifar10_train3_lblvec.gz"
    ; "cifar10_train4_data.gz"
    ; "cifar10_train4_labels.gz"
    ; "cifar10_train4_filenames.gz"
    ; "cifar10_train4_lblvec.gz"
    ; "cifar10_train5_data.gz"
    ; "cifar10_train5_labels.gz"
    ; "cifar10_train5_filenames.gz"
    ; "cifar10_train5_lblvec.gz"
    ]
  in
  List.iter (fun fname -> download_data fname) l


let draw_samples x y n =
  let x', y', _ = Owl_dense_matrix_generic.draw_rows2 ~replacement:false x y n in
  x', y'


(* load mnist train data, the return is a triplet. The first is a 60000 x 784
  matrix where each row represents a 28 x 28 image. The second is label and the
  third is the corresponding unravelled row vector of the label. *)
let load_mnist_train_data () =
  let p = local_data_path () in
  ( Owl_dense_matrix.S.load (p ^ "mnist-train-images")
  , Owl_dense_matrix.S.load (p ^ "mnist-train-labels")
  , Owl_dense_matrix.S.load (p ^ "mnist-train-lblvec") )


let load_mnist_test_data () =
  let p = local_data_path () in
  ( Owl_dense_matrix.S.load (p ^ "mnist-test-images")
  , Owl_dense_matrix.S.load (p ^ "mnist-test-labels")
  , Owl_dense_matrix.S.load (p ^ "mnist-test-lblvec") )


let print_mnist_image x =
  Owl_dense_matrix_generic.reshape x [| 28; 28 |]
  |> Owl_dense_matrix_generic.iter_rows (fun v ->
         Owl_dense_matrix_generic.iter
           (function
             | 0. -> Printf.printf " "
             | _  -> Printf.printf "■")
           v;
         print_endline "")


(* similar to load_mnist_train_data but returns [x] as [*,28,28,1] ndarray *)
let load_mnist_train_data_arr () =
  let x, label, y = load_mnist_train_data () in
  let m = Owl_dense_matrix.S.row_num x in
  let x = Owl_dense_ndarray.S.reshape x [| m; 28; 28; 1 |] in
  x, label, y


let load_mnist_test_data_arr () =
  let x, label, y = load_mnist_test_data () in
  let m = Owl_dense_matrix.S.row_num x in
  let x = Owl_dense_ndarray.S.reshape x [| m; 28; 28; 1 |] in
  x, label, y


(* load cifar train data, there are five batches in total. The loaded data is a
  10000 * 3072 matrix. Each row represents a 32 x 32 image of three colour
  channels, unravelled into a row vector. The labels are also returned. *)
let load_cifar_train_data batch =
  let p = local_data_path () in
  ( Owl_dense_ndarray.S.load (p ^ "cifar10_train" ^ string_of_int batch ^ "_data")
  , Owl_dense_matrix.S.load (p ^ "cifar10_train" ^ string_of_int batch ^ "_labels")
  , Owl_dense_matrix.S.load (p ^ "cifar10_train" ^ string_of_int batch ^ "_lblvec") )


let load_cifar_test_data () =
  let p = local_data_path () in
  ( Owl_dense_ndarray.S.load (p ^ "cifar10_test_data")
  , Owl_dense_matrix.S.load (p ^ "cifar10_test_labels")
  , Owl_dense_matrix.S.load (p ^ "cifar10_test_lblvec") )


let draw_samples_cifar x y n =
  let col_num = (Owl_dense_ndarray_generic.shape x).(0) in
  let a = Array.init col_num (fun i -> i) in
  let a = Owl_stats.choose a n |> Array.to_list in
  ( Owl_dense_ndarray.S.get_fancy [ L a; R []; R []; R [] ] x
  , Owl_dense_matrix.S.get_fancy [ L a; R [] ] y )


(* load text data and stopwords *)
let load_stopwords () =
  let p = local_data_path () in
  Owl_nlp_utils.load_stopwords (p ^ "stopwords.txt")


let load_nips_train_data stopwords =
  let p = local_data_path () in
  Owl_nlp_utils.load_from_file ~stopwords (p ^ "nips.train")
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