[Feature] remove optimizer and refactorying objective

.github/CODEOWNERS

@@ -1,2 +1,2 @@
 # ALL
-@RektPunk
+@RektPunk

.github/workflows/lint.yaml

@@ -3,7 +3,8 @@ name: Lint
 on:
   push:
     paths:
-      - '**.py'
+      - "**.py"
+      - "**.ipynb"
 
 jobs:
   run-linters:
@@ -12,7 +13,14 @@ jobs:
 
     steps:
       - name: Check out Git repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
-      - name: Lint check ruff
-        uses: chartboost/ruff-action@v1
+      - name: Install Ruff
+        uses: astral-sh/ruff-action@v4.0.0
+        with:
+          args: "--version"
+
+      - name: Run Ruff Check & Format
+        run: |
+          ruff check .
+          ruff format --check --diff .

.github/workflows/pypi_release.yaml

@@ -3,19 +3,21 @@ name: Publish Python Package
 on:
   push:
     tags:
-      - 'v*.*.*'
+      - "v*.*.*"
 
 jobs:
-  release:
+  build-and-publish:
     runs-on: ubuntu-latest
 
     steps:
-    - name: Checkout repository
-      uses: actions/checkout@v4
+      - name: Checkout code
+        uses: actions/checkout@v6
 
-    # poetry publish
-    - name: Publish module
-      uses: JRubics/poetry-publish@v2.0
-      with:
-        pypi_token: ${{ secrets.PYPI_TOKEN }}
-        poetry_install_options: "--without dev"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+
+      - name: Build distributions
+        run: uv build --sdist --wheel
+
+      - name: Publish to PyPI
+        run: uv publish --token ${{ secrets.PYPI_TOKEN }}

.github/workflows/test.yaml

@@ -2,35 +2,26 @@ name: Tests
 
 on:
   pull_request:
-    types: [opened, reopened, ready_for_review, review_requested]
+    types: [opened, reopened, synchronize]
   push:
     branches:
       - main
 
 jobs:
   run-pytest:
-
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
-
-    - name: Set up python
-      uses: actions/setup-python@v5
-      with:
-        python-version: '3.12'
-
-    - name: Install Poetry
-      uses: snok/install-poetry@v1
+      - name: Checkout code
+        uses: actions/checkout@v6
 
-    - name: Install dependencies
-      run: poetry install --no-interaction --with dev
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
 
-    - name: Run tests
-      run: poetry run pytest --junitxml=pytest.xml --cov-report=term-missing:skip-covered --cov=app tests/ | tee pytest-coverage.txt
+      - name: Install dependencies
+        run: |
+          uv sync --all-extras
+          uv pip install -e .
 
-    - name: Pytest coverage comment
-      uses: MishaKav/pytest-coverage-comment@main
-      with:
-        pytest-coverage-path: ./pytest-coverage.txt
-        junitxml-path: ./pytest.xml
+      - name: Run tests
+        run: uv run pytest

.gitignore

@@ -7,3 +7,4 @@ __pycache__/
 .vscode/
 .pytest_cache/
 .mypy_cache/
+*.egg-info

.pre-commit-config.yaml

@@ -1,24 +1,22 @@
 repos:
-- repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v5.0.0
-  hooks:
-    - id: trailing-whitespace
-    - id: end-of-file-fixer
-    - id: check-yaml
-    - id: check-json
-    - id: check-toml
-    - id: check-added-large-files
-    - id: check-merge-conflict
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-json
+      - id: check-toml
+      - id: check-added-large-files
+      - id: check-merge-conflict
 
-- repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: v0.7.4
-  hooks:
-    - id: ruff
-      args: [ --fix ]
-    - id: ruff-format
-
-- repo: https://github.com/pycqa/isort
-  rev: 5.13.2
-  hooks:
-    - id: isort
-      args: ["--profile", "black"]
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.15.12
+    hooks:
+      - id: ruff
+        name: ruff check
+        args: [--fix]
+      - id: ruff
+        name: ruff isort
+        args: [--select, I, --fix]
+      - id: ruff-format

.python-version

@@ -0,0 +1 @@
+3.14

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 RektPunk
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,41 +1,40 @@
 <div style="text-align: center;">
   <img src="https://capsule-render.vercel.app/api?type=transparent&fontColor=0047AB&text=MQBoost&height=120&fontSize=90">
 </div>
-<p align="center">
-  <a href="https://github.com/RektPunk/MQBoost/releases/latest">
-    <img alt="release" src="https://img.shields.io/github/v/release/RektPunk/mqboost.svg">
-  </a>
-  <a href="https://pypi.org/project/MQBoost">
-    <img alt="Pythonv" src="https://img.shields.io/pypi/pyversions/MQBoost.svg?logo=python&logoColor=white">
-  </a>
-  <a href="https://github.com/RektPunk/MQBoost/blob/main/LICENSE">
-    <img alt="License" src="https://img.shields.io/github/license/RektPunk/MQboost.svg">
-  </a>
-  <a href="https://github.com/RektPunk/MQBoost/actions/workflows/lint.yaml">
-    <img alt="Lint" src="https://github.com/RektPunk/MQBoost/actions/workflows/lint.yaml/badge.svg?branch=main">
-  </a>
-  <a href="https://github.com/RektPunk/MQBoost/actions/workflows/test.yaml">
-    <img alt="Test" src="https://github.com/RektPunk/MQBoost/actions/workflows/test.yaml/badge.svg?branch=main">
-  </a>
-</p>
 
+**MQBoost** is a gradient boosting-based framework for simultaneous multi-quantile regression with monotonicity constraints (non-crossing quantiles).
+It is built on top of  [LightGBM](https://github.com/microsoft/LightGBM) and [XGBoost](https://github.com/dmlc/xgboost), two leading gradient boosting frameworks, enabling efficient and scalable training while ensuring valid quantile estimates.
 
-**MQBoost** introduces an advanced model for estimating multiple quantiles while ensuring the non-crossing condition (monotone quantile condition). This model harnesses the capabilities of both [LightGBM](https://github.com/microsoft/LightGBM) and [XGBoost](https://github.com/dmlc/xgboost), two leading gradient boosting frameworks.
+Standard quantile regression models often suffer from quantile crossing (e.g., 90% quantile < 50% quantile) and independent training per quantile → inconsistent predictions. We solve this by:
+- Learning multiple quantiles jointly
+- Enforcing monotonicity across quantiles
+- Leveraging efficient boosting frameworks
 
-By implementing the hyperparameter optimization prowess of [Optuna](https://github.com/optuna/optuna), the model achieves great performance. Optuna's optimization algorithms fine-tune the hyperparameters, ensuring the model operates efficiently.
-
-# Installation
+# Usage
+## Installation
 Install using pip:
 ```bash
 pip install mqboost
 ```
 
-# Usage
 ## Features
-- **MQDataset**: Encapsulates the dataset used for MQRegressor and MQOptimizer.
+- **MQDataset**: Encapsulates the dataset used for MQRegressor.
 - **MQRegressor**: Custom multiple quantile estimator with preserving monotonicity among quantiles.
-- **MQOptimizer**: Optimize hyperparameters for MQRegressor with Optuna.
-
 
 ## Example
-Please refer to the [**Examples**](https://github.com/RektPunk/MQBoost/tree/main/examples) provided for further clarification.
+Please refer to the [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/RektPunk/MQBoost/blob/main/examples/mqregressor.ipynb) or [**Examples**](https://github.com/RektPunk/MQBoost/tree/main/examples/mqregressor.py) provided for further clarification.
+
+# Citation
+If you use MQBoost in your research or project, please cite it as follows:
+```bibtex
+@article{Moon2026,
+  title={Monotone Composite Quantile Regression via Second-Order Gradient Boosting Framework},
+  author={Moon, Sangjun and Hong, Sungchul and Park, Beomjin},
+  journal={Machine Learning},
+  volume={115},
+  number={6},
+  pages={127},
+  year={2026},
+  publisher={Springer}
+}
+```