[Feature] add pypi deploy action (#10)

.github/workflows/pypi_release.yaml

@@ -0,0 +1,20 @@
+name: Publish Python Package
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Publish module
+      uses: JRubics/poetry-publish@v2.0
+      with:
+        pypi_token: ${{ secrets.PYPI_TOKEN }}
+        poetry_install_options: "--without dev"

imlightgbm/__init__.py

@@ -1,2 +1,4 @@
 # ruff: noqa
 from imlightgbm.engine import cv, train
+
+__version__ = "0.0.1"

imlightgbm/objective.py

@@ -135,6 +135,11 @@ def _get_fobj_feval(
     """Return obj and eval with respect to task type."""
     _task = type_of_target(train_set.get_label())
     task_enum = SupportedTask.get(_task)
+    # FIXME: remove after developing multiclass objective
+    if task_enum != SupportedTask.binary:
+        raise ValueError(
+            "Inferred task is not binary. Multiclass classification will be supported starting from version 0.1.0."
+        )
     feval = _get_metric(task_enum=task_enum, metric=metric)
     fobj = _get_objective(
         task_enum=task_enum, objective=objective, alpha=alpha, gamma=gamma