Add CI via Github actions

.github/workflows/tests_full.yaml

@@ -0,0 +1,41 @@
+name: "Full set of tests for PRs and master branch"
+on: 
+  push:
+    branches:
+      - "master"
+  pull_request:
+
+concurrency: 
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  tests:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+    name: Python ${{ matrix.python-version }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install Nox
+      run: pip install nox==2024.03.02
+    - name: Run tests
+      run: nox --non-interactive --error-on-missing-interpreter --session "tests-${{ matrix.python-version }}"
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.9
+      - name: Install Nox
+        run: pip install nox==2024.03.02
+      - name: Lint
+        run: nox --non-interactive --error-on-missing-interpreter --session "lint"

.github/workflows/tests_reduced.yaml

@@ -0,0 +1,40 @@
+name: "Reduced set of tests for push events"
+on:
+  push:
+    branches-ignore:
+      - master
+
+concurrency: 
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.11"]
+    name: Python ${{ matrix.python-version }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install Nox
+      run: pip install nox==2024.03.02
+    - name: Run tests
+      run: nox --non-interactive --error-on-missing-interpreter --session "tests-${{ matrix.python-version }}"
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.9
+      - name: Install Nox
+        run: pip install nox==2024.03.02
+      - name: Lint
+        run: nox --non-interactive --error-on-missing-interpreter --session "lint"

noxfile.py

@@ -13,8 +13,13 @@ def lint(session):
     session.run('flake8', *args)
 
 
-@nox.session
+@nox.session(python=["3.8", "3.9", "3.10", "3.11", "3.12"])
 def tests(session):
+    session.install(
+        'torch==2.2.1',
+        'torchvision',
+        '--index-url', 'https://download.pytorch.org/whl/cpu'
+    )
     session.install('.')
     session.install('pytest')
     session.install('pytest-mock')

src/pytorch_fid/fid_score.py

@@ -64,8 +64,9 @@ def tqdm(x):
                     help=('Dimensionality of Inception features to use. '
                           'By default, uses pool3 features'))
 parser.add_argument('--save-stats', action='store_true',
-                    help=('Generate an npz archive from a directory of samples. '
-                          'The first path is used as input and the second as output.'))
+                    help=('Generate an npz archive from a directory of '
+                          'samples. The first path is used as input and the '
+                          'second as output.'))
 parser.add_argument('path', type=str, nargs=2,
                     help=('Paths to the generated images or '
                           'to .npz statistic files'))
@@ -307,7 +308,11 @@ def main():
         num_workers = args.num_workers
 
     if args.save_stats:
-        save_fid_stats(args.path, args.batch_size, device, args.dims, num_workers)
+        save_fid_stats(args.path,
+                       args.batch_size,
+                       device,
+                       args.dims,
+                       num_workers)
         return
 
     fid_value = calculate_fid_given_paths(args.path,