Source file pyinit.ml

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(* -------------------------------------------------------------------------- *)
(* Initiate necromantic rite *)

open Pytools

let pyinit () =
  if not (Py.is_initialized ()) then (
    Printf.eprintf "Initializing python... \n%!" ;
    Py.initialize ~version:3 () ;
    Format.eprintf
      "Python library used: (%a)\n%!"
      Format.(pp_print_option pp_print_string)
      (Py.get_library_filename ()))

let numpy () =
  pyinit () ;
  handle_python_error "While initializing numpy" @@ fun () ->
  Py.Import.import_module "numpy"

let linear_model () =
  pyinit () ;
  handle_python_error "While initializing sklearn.linear_model" @@ fun () ->
  Py.Import.import_module "sklearn.linear_model"

let scipy_optimize () =
  pyinit () ;
  handle_python_error "While initializing scipy.optimize" @@ fun () ->
  Py.Import.import_module "scipy.optimize"

let sklearn_metrics () =
  pyinit () ;
  handle_python_error "While initializing sklearn.metrics" @@ fun () ->
  Py.Import.import_module "sklearn.metrics"

let statsmodels_api () =
  pyinit () ;
  handle_python_error "While initializing statsmodels.api" @@ fun () ->
  Py.Import.import_module "statsmodels.api"

let statsmodels_stats () =
  pyinit () ;
  handle_python_error "While initializing statsmodels.stats" @@ fun () ->
  Py.Import.import_module "statsmodels.stats"

let%expect_test "pyinit can be called twice without failing" =
  (* Paths are environment specific, do not leak into tests *)
  let discard_python_path str =
    let re = Str.regexp {|\(Python library used:\).*|} in
    Str.replace_first re {|\1REPLACED_FOR_TEST|} str
  in
  pyinit () ;
  [%expect.output] |> discard_python_path |> print_endline ;
  [%expect
    {|
      Initializing python...
      Python library used:REPLACED_FOR_TEST|}] ;
  (* Second run is empty, but no failure *)
  pyinit () ;
  [%expect {| |}]