add env setup for runtime to enable multiprocessing parameter search by joblib, closes #23

src/delta_barth/__init__.py

@@ -1,23 +1,22 @@
-import multiprocessing
-import os
-import sys
-from pathlib import Path
+# import multiprocessing
+# import os
+# import sys
+# from pathlib import Path
 
 # os.environ["JOBLIB_DISABLE_SHARED_MEMORY"] = "1"
 
-interpreter = r"A:\Arbeitsaufgaben\Delta-Barth\cs-wrapper\dopt.DeltaBarth\python\python.exe"
-intp_pth = Path(interpreter).resolve()
+# interpreter = r"A:\Arbeitsaufgaben\Delta-Barth\cs-wrapper\dopt.DeltaBarth\python\python.exe"
+# intp_pth = Path(interpreter).resolve()
 
-assert intp_pth.exists(), f"interpreter path seems not to exist: {intp_pth}"
+# assert intp_pth.exists(), f"interpreter path seems not to exist: {intp_pth}"
 
 # multiprocessing.set_executable(str(intp_pth))
 # setattr(sys, "frozen", True) # !! causes termination
 # sys.executable = str(intp_pth)
-setattr(sys, "executable", str(intp_pth))
-setattr(sys, "_base_executable", str(intp_pth))
+# setattr(sys, "executable", str(intp_pth))
+# setattr(sys, "_base_executable", str(intp_pth))
 # multiprocessing.set_start_method("spawn", force=True)
 
-
-target = Path(r"A:\Arbeitsaufgaben\Delta-Barth\cs-wrapper\dopt.DeltaBarth")
-file = target / "executed.txt"
-file.touch()
+# target = Path(r"A:\Arbeitsaufgaben\Delta-Barth\cs-wrapper\dopt.DeltaBarth")
+# file = target / "executed.txt"
+# file.touch()

src/delta_barth/_env.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+from typing import Final
+
+from dopt_basics import io
+
+PY_RUNTIME_FOLDER: Final[str] = "python"
+
+
+def prepare_env(
+    lib_path: Path,
+) -> Path | None:
+    pyrt_folder = io.search_folder_path(
+        starting_path=lib_path,
+        stop_folder_name=PY_RUNTIME_FOLDER,
+        return_inclusive=True,
+    )
+    if pyrt_folder is None:
+        return None
+
+    pth_interpreter = pyrt_folder / "python.exe"
+    if not pth_interpreter.exists():
+        raise FileNotFoundError(
+            f"dopt-delta-barth seems to be deployed in a standalone runtime, "
+            f"but the interpreter was not found under: {pth_interpreter}"
+        )
+
+    setattr(sys, "executable", str(pth_interpreter))
+    setattr(sys, "_base_executable", str(pth_interpreter))
+
+    return pyrt_folder

src/delta_barth/analysis/forecast.py

@@ -38,6 +38,7 @@ from delta_barth.constants import (
     DEFAULT_DB_ERR_CODE,
     DUMMY_DATA_PATH,
     FEATURES_SALES_PROGNOSIS,
+    MAX_NUM_WORKERS,
     SALES_MIN_NUM_DATAPOINTS,
 )
 from delta_barth.errors import STATUS_HANDLER, wrap_result
@@ -302,7 +303,7 @@ def _process_sales(
                     params,
                     scoring="neg_mean_absolute_error",
                     cv=kfold,
-                    n_jobs=-1,
+                    n_jobs=MAX_NUM_WORKERS,
                     n_iter=100,
                     verbose=0,
                 )