Merge pull request #31 from hstewart93/finder

Finder

Author: hstewart93

.github/workflows/publish.yml

@@ -37,5 +37,3 @@ jobs:
         files: dist/*
         name: ${{ steps.branch_info.outputs.TAG }}
         tag_name: ${{ steps.branch_info.outputs.TAG }}
-
-

.github/workflows/pytest.yml

@@ -0,0 +1,24 @@
+name: Pytest
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  pytest:
+    name: Run tests
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.12'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e .[ci]
+    - name: Run tests
+      run: |
+            pytest

MANIFEST.in

@@ -0,0 +1 @@
+include continunet/network/trained_model.h5

README.md

@@ -1,27 +1,44 @@
 # ContinUNet
+[![Pytest](https://github.com/hstewart93/continunet/actions/workflows/pytest.yml/badge.svg)](https://github.com/hstewart93/continunet/actions/workflows/pytest.yml)
+
 Source finding package for radio continuum data powered by U-Net segmentation algorithm.
 
+- [Paper](https://academic.oup.com/rasti/article/3/1/315/7685538?utm_source=advanceaccess&utm_campaign=rasti&utm_medium=email#supplementary-data)
+- [Installation](#installation)
+- [Developer Installation](#developer-installation)
+- [Quickstart](#quickstart)
+- [Example Notebook](https://github.com/hstewart93/continunet/tree/finder/continunet/user_example.ipynb)
+- [Training Dataset](https://www.kaggle.com/datasets/harrietstewart/continunet)
+- [Next Release](#development)
+
 ## Installation
 The project is available on [PyPI](https://pypi.org/project/continunet/), to install latest stable release use:
 
-```pip install continunet```
+```bash
+pip install continunet
+```
 
 To install version in development, use:
 
-```pip install git+https://github.com/hstewart93/continunet```
+```bash
+pip install git+https://github.com/hstewart93/continunet
+```
+
+**ContinUNet has a `Python 3.9` minimum requirement.**
 
 ## Developer Installation
 If you want to contribute to the repository, install as follows:
 
-Once you have cloned down this repository using `git clone` cd into the app directory eg.
+Once you have cloned down this repository using `git clone`, cd into the app directory:
 
-```
+```bash
+git clone git@github.com:hstewart93/continunet.git
 cd continunet
 ```
 
 Create a virtual environment for development, if you are using bash:
 
-```
+```bash
 python3 -m venv venv
 source venv/bin/activate
 pip install -e .[dev,ci]
@@ -31,10 +48,89 @@ To exit the virtual environment use `deactivate`.
 
 This project used the black auto formatter which can be run on git commit along with flake8 if you install pre-commit. To do this run the following in your terminal from within your virtual environment.
 
-```
+```bash
 pre-commit install
 ```
 
 Now pre-commit hooks should run on `git commit`.
 
-The run the test suite use `pytest`.
+To run the test suite use `pytest`.
+
+## Quickstart
+The package currently support `.FITS` type images. To perform source finding you can import the `finder` module:
+
+```python
+from continunet.finder import Finder
+```
+
+Load your image file:
+
+```python
+finder = Finder("<filepath>")
+```
+
+To produce a source catalogue and populate the `Finder` instance:
+
+```python
+sources = finder.find()
+```
+
+If you want to calculate the model map and residuals image as part of source finding, use the `Finder.find()` method with `generate_maps=True`:
+
+```python
+sources = finder.find(generate_maps=True)
+model_map = finder.model_map
+residuals = finder.residuals
+```
+
+Alternatively, manually calculate model map and residual images using:
+
+```python
+model_map = finder.get_model_map()
+residuals = finder.get_residuals()
+```
+
+Useful available attributes of the `Finder` object are:
+```python
+finder.sources # cleaned source catalogue
+finder.reconstructed_image # predicted image reconstructed by unet module
+finder.segmentation_map # predicted segmentation map
+finder.model_map # model map of cleaned predicted sources
+finder.residuals # residual image as numpy array
+finder.raw_sources # sources from labelled segmentation map before cleaning
+```
+
+Export source catalogue using `finder.export_sources` as `.csv` by default or `.FITS` by setting `export_fits=True`:
+
+```python
+finder.export_sources("<filepath>", export_fits=<Boolean>)
+```
+
+Source parameters extracted are:
+
+| **Parameter**              | **Description**                                                                                        |
+|----------------------------|--------------------------------------------------------------------------------------------------------|
+| `x_location_original`      | x coordinate of the source from the cutout used for inference                                          |
+| `y_location_original`      | y coordinate of the source from the cutout used for inference                                          |
+| `orientation`              | orientation of source ellipse in radians                                                               |
+| `major_axis`               | major axis of source ellipse                                                                           |
+| `minor_axis`               | minor axis of source ellipse                                                                           |
+| `flux_density_uncorrected` | total intensity of the segmented source region before beam corrections applied                         |
+| `label`                    | class label in predicted segmentation map                                                              |
+| `x_location`               | x coordinate of the source in the original input image dimensions                                      |
+| `y_location`               | y coordinate of the source in the original input image dimensions                                      |
+| `right_ascension`          | RA coordinate of the source in the original input image dimensions                                     |
+| `declination`              | Dec coordinate of the source in the original input image dimensions                                    |
+| `area`                     | area of source ellipse                                                                                 |
+| `position_angle`           | position angle of source ellipse in degrees                                                            |
+| `correction_factor`        | correction factor applied to flux density measurement to account for undersampling of synthesised beam |
+| `flux_density`             | corrected flux density                                                                                 |
+
+## Development
+ContinUNet is subject to ongoing development. To see the backlog of features and bug fixes please go to the [project board](https://github.com/users/hstewart93/projects/4/views/1). Please raise any feature requests or bugs as [issues](https://github.com/hstewart93/continunet/issues).
+
+The following features will be added in the next release:
+
+1. Exporting processed images to `.npy` and `.FTIS` [(#33)](https://github.com/hstewart93/continunet/issues/33)
+2. Inference for non-square images [(#27)](https://github.com/hstewart93/continunet/issues/27)
+3. Taking cutout of `ImageSquare` object before inference [(#28)](https://github.com/hstewart93/continunet/issues/28)

continunet/constants.py

@@ -0,0 +1,13 @@
+"""Constants for ContinuNet."""
+
+
+TRAINED_MODEL = "continunet/network/trained_model.h5"
+
+# ANSI escape sequences
+RED = "\033[31m"
+GREEN = "\033[32m"
+YELLOW = "\033[33m"
+BLUE = "\033[34m"
+MAGENTA = "\033[35m"
+CYAN = "\033[36m"
+RESET = "\033[0m"

continunet/example_image.fits

@@ -0,0 +1,87 @@
+"""Compile ContinUNet modules into Finder class for source finding."""
+
+import importlib.resources
+import time
+
+from astropy.table import Table
+
+from continunet.constants import GREEN, RESET
+from continunet.image.fits import ImageSquare
+from continunet.image.processing import PreProcessor, PostProcessor
+from continunet.network.unet import Unet
+
+
+class Finder:
+    """Class for source finding in radio continuum images."""
+
+    def __init__(self, image: str, layers: int = 4):
+        """Initialise the Finder class.
+
+        Parameters
+        ----------
+        image : str
+            The path to the FITS image.
+        layers : int
+            The number of encoding and decoding layers in the U-Net model.
+            Layers is set by default to 4, and cannot currently be changed.
+        """
+        if not image.endswith(".fits"):
+            raise ValueError("File must be a .fits file.")
+        self.image = image
+        if layers != 4:
+            raise ValueError("Number of layers must be 4.")
+        self.layers = layers
+        self.image_object = None
+        self.sources = None
+        self.reconstructed_image = None
+        self.post_processor = None
+        self.segmentation_map = None
+        self.model_map = None
+        self.residuals = None
+        self.raw_sources = None
+
+    def find(self, generate_maps=False, threshold="default"):
+        """Find sources in a continuum image."""
+        start_time = time.time()
+        # Load image
+        self.image_object = ImageSquare(self.image)
+
+        # Pre-process image
+        pre_processor = PreProcessor(self.image_object, self.layers)
+        data = pre_processor.process()
+
+        # Run U-Net
+        with importlib.resources.path("continunet.network", "trained_model.h5") as path:
+            unet = Unet(data.shape[1:4], trained_model=path, image=data, layers=self.layers)
+        self.reconstructed_image = unet.decode_image()
+
+        # Post-process reconstructed image
+        self.post_processor = PostProcessor(unet.reconstructed, pre_processor, threshold=threshold)
+        self.sources = self.post_processor.get_sources()
+        self.segmentation_map = self.post_processor.segmentation_map
+        self.raw_sources = self.post_processor.raw_sources
+
+        end_time = time.time()
+        print(
+            f"{GREEN}ContinUNet found {len(self.sources)} sources "
+            f"in {(end_time - start_time):.2f} seconds.{RESET}"
+        )
+
+        if generate_maps:
+            self.model_map = self.post_processor.get_model_map()
+            self.residuals = self.post_processor.get_residuals()
+            self.segmentation_map = self.post_processor.segmentation_map
+
+        return self.sources
+
+    def export_sources(self, path: str, export_fits=False):
+        """Export source catalogue to a directory. Use export_fits=True to save as FITS."""
+        if self.sources is None:
+            raise ValueError("No sources to export.")
+        if export_fits:
+            table = Table.from_pandas(self.sources)
+            table.write(path, format="fits", overwrite=True)
+            return self
+
+        self.sources.to_csv(path)
+        return self

continunet/finder.py

@@ -6,6 +6,8 @@
 from astropy.io import fits
 from astropy.wcs import WCS
 
+from continunet.constants import CYAN, RESET
+
 
 class FitsImage(ABC):
     """Abstract model for an image imported from FITS format."""
@@ -22,6 +24,7 @@ def __init__(self, path):
 
     def load(self):
         """Load fits image from file and populate model args."""
+        print(f"{CYAN}Loading FITS image from {self.path}...{RESET}")
         if not self.path:
             raise ValueError("Path to FITS file not provided.")