Make lighthouse an installable python package (#7)

The PR modifies `pyproject.toml` to make the content of `python/lighthouse` to be installable via `uv pip install .` For now the package is empty, but after #4 is merged users would be able to access ingress helper functions as part of the package:
```python
from lighthouse.ingress.torch import import_from_file

...
```

* install lighthouse on 'uv sync'

Signed-off-by: dchigarev <dmitry.chigarev@intel.com>

* use dynamic version in pyproject.toml

Signed-off-by: dchigarev <dmitry.chigarev@intel.com>

---------

Signed-off-by: dchigarev <dmitry.chigarev@intel.com>

Author: dchigarev

.gitignore

@@ -0,0 +1,9 @@
+# Python caches
+__pycache__/
+*.py[cod]
+.pytest_cache
+
+# Lighthouse Python module builds
+dist/
+python/lighthouse*.egg-info/
+*.whl

README.md

@@ -53,10 +53,10 @@ The planned work is:
 ## Getting up and running
 
 For the time being, `lighthouse` depends on just the Python bindings for [`mlir`](https://github.com/llvm/eudsl/releases).
-To install this dependency, obtain the [`uv`](https://docs.astral.sh/uv/getting-started/installation/#pypi) Python package manager and run the following in the root of the project:
+To install this dependency along with `lighthouse` python package, obtain the [`uv`](https://docs.astral.sh/uv/getting-started/installation/#pypi) Python package manager and run the following in the root of the project:
 ```
 $ uv venv  # Create a .venv virtualenv
-$ uv sync  # Install the `mlir-python-bindings` dependency into the virtualenv
+$ uv sync  # Install the `mlir-python-bindings` and `lighthouse` into the virtualenv
 $ uv sync --extra ingress-torch-cpu  # Optionally install the dependencies for torch ingress
 ```
 
@@ -68,3 +68,52 @@ For vendor-specific versions of `torch` use the targets `ingress-torch-nvidia`,
 </details>
 
 To run the Python programs in this repo, either enter the virtual environment (`$ source .venv/bin/activate`) and execute a program _or_ execute each of the programs through `uv` (i.e. `$ uv run $EXE`), which will automatically run them inside the virtualenv.
+
+## Installing Lighthouse as a Python package
+
+You can install `lighthouse` as a Python package using `uv` or `pip`:
+
+#### Installing via `uv`
+
+If you've run the steps from the [Getting up and running](#getting-up-and-running) section,
+you already have `lighthouse` installed in your virtual environment:
+
+```
+$ uv run python
+Python 3.12.11 | (main, Jun  4 2025, 14:45:31) [GCC 13.3.0] on linux
+Type "help", "copyright", "credits" or "license" for more information.
+>>> import lighthouse
+>>> lighthouse.__version__
+'0.1.0a1'
+```
+
+If you don't want to use the virtual environment created by `uv`, you can skip `uv venv; uv sync` steps and install Lighthouse in your current environment using:
+
+```
+$ source ../my_custom_venv/bin/activate # or conda activate my-venv
+(my-venv) $ uv pip install . # installs Lighthouse along with its basic dependencies
+(my-venv) $ uv pip install .[ingress_torch_cpu] # installs Lighthouse along with its torch-ingress dependencies
+```
+
+#### Installing via `pip`
+
+If you don't want to use `uv` to install the package, you can install it directly with `pip`.
+You'll need to specify the custom sources so `pip` can find all required dependencies (e.g., mlir-bindings). The sources are listed in the `pyproject.toml` file.
+
+Here are some common installation examples:
+
+1. Install Lighthouse only
+```
+pip install . \
+  --find-links https://llvm.github.io/eudsl/ \
+  --only-binary :all:
+```
+
+2. Install Lighthouse and torch-ingress dependencies
+```
+pip install .[ingress_torch_cpu] \
+  --find-links https://llvm.github.io/eudsl/ \
+  --find-links https://github.com/llvm/torch-mlir-release/releases/expanded_assets/dev-wheels \
+  --extra-index-url https://download.pytorch.org/whl \
+  --only-binary :all:
+```

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "lighthouse"
-version = "0.1.0a1"
+dynamic = ["version"]
 requires-python = ">=3.10,<3.13"  # Bounds are due to torch-mlir's packaging
 dependencies = [
     "mlir-python-bindings==20251011+3af43e303",
@@ -62,3 +62,14 @@ explicit = true
 name = "torch_mlir"
 url = "https://github.com/llvm/torch-mlir-release/releases/expanded_assets/dev-wheels"
 explicit = true
+
+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools.packages.find]
+where = ["python"]
+include = ["lighthouse*"]
+
+[tool.setuptools.dynamic]
+version = {attr = "lighthouse.__version__"}

python/lighthouse/__init__.py

@@ -0,0 +1 @@
+__version__ = "0.1.0a1"