Raise minimum Python version to 3.8

.github/workflows/check_example_nbs.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Set Up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.7
+          python-version: 3.8
       - name: Set Up Environment
         run: |
           make install-uv reset-venv

.github/workflows/test.yml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python: ["3.7", "3.12"]
+        python: ["3.8", "3.12"]
 
     steps:
       - name: Checkout Code
@@ -51,8 +51,8 @@ jobs:
           make install-uv reset-venv
           source .venv/bin/activate
           make install-pinned-extras-${{ matrix.python }}
-      - name: Run Pytest (Python 3.7)
-        if: matrix.python == '3.7'
+      - name: Run Pytest (Python 3.8)
+        if: matrix.python == '3.8'
         run: |
           source .venv/bin/activate
           export LIGHTLY_SERVER_LOCATION="localhost:-1"

.github/workflows/test_code_format.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python: ["3.7", "3.12"]
+        python: ["3.8", "3.12"]
     steps:
     - name: Checkout Code
       uses: actions/checkout@v4

.github/workflows/test_minimal_deps.yml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python: ["3.7"]
+        python: ["3.8"]
         dependencies: ["minimal", "minimal-extras"]
     steps:
       - uses: actions/checkout@v4

.github/workflows/test_setup.yml

@@ -40,7 +40,7 @@ jobs:
       - name: Set Up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.7
+          python-version: 3.8
       - name: Set Up Environment
         run: |
           make install-uv reset-venv

.github/workflows/tests_unmocked.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Set Up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.7
+        python-version: 3.8
         cache: pip
         cache-dependency-path: |
           pyproject.toml

.readthedocs.yml

@@ -15,7 +15,7 @@ formats:
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.7
+  version: 3.8
   install:
     - method: pip
       path: .

Makefile

@@ -206,8 +206,8 @@ else
 endif
 
 # Install package with pinned extras for specific Python versions used in CI.
-.PHONY: install-pinned-extras-3.7 install-pinned-extras-3.12
-install-pinned-extras-3.7: install-pinned-extras-no-video
+.PHONY: install-pinned-extras-3.8 install-pinned-extras-3.12
+install-pinned-extras-3.8: install-pinned-extras-no-video
 install-pinned-extras-3.12: install-av-system-deps install-pinned-extras
 
 # Install package with the latest dependencies.

README.md

@@ -97,7 +97,7 @@ Community and partner projects:
 
 ## Quick Start
 
-Lightly requires **Python 3.7+**. We recommend installing Lightly in a **Linux** or **OSX** environment. Python 3.13 is not yet supported, as PyTorch itself lacks Python 3.13 compatibility.
+Lightly requires **Python 3.8+**. We recommend installing Lightly in a **Linux** or **OSX** environment. Python 3.13 is not yet supported, as PyTorch itself lacks Python 3.13 compatibility.
 
 ### Dependencies
 

docs/source/getting_started/install.rst

@@ -4,7 +4,7 @@ Installation
 Supported Python versions
 -------------------------
 
-Lightly\ **SSL** requires Python 3.7+. We recommend installing Lightly\ **SSL** in a Linux or OSX environment.
+Lightly\ **SSL** requires Python 3.8+. We recommend installing Lightly\ **SSL** in a Linux or OSX environment.
 
 .. _rst-installing:
 

lightly/loss/lejepa_loss.py

@@ -1,5 +1,7 @@
 """LeJEPA loss functions and regularizers."""
 
+from typing import cast
+
 import torch
 from torch import Tensor, nn
 from torch import distributed as torch_dist
@@ -202,7 +204,10 @@ def _compute_cf_error_at_each_frequency(
         cos_mean = cos_sum / num_samples
         sin_mean = sin_sum / num_samples
         phi = self.phi.to(dtype=x_t.dtype)
-        return (cos_mean - phi).square() + sin_mean.square()  # type: ignore[operator]
+        return cast(
+            Tensor,
+            (cos_mean - phi).square() + sin_mean.square(),  # type: ignore[operator]
+        )
 
     def _integrate_via_trapezoidal_rule(
         self,
@@ -212,7 +217,7 @@ def _integrate_via_trapezoidal_rule(
         """Integrate the error over frequency using trapezoidal weights."""
         weights = self.weights.to(dtype=err_per_frequency.dtype)
         statistic = (err_per_frequency @ weights) * num_samples  # type: ignore[operator]
-        return statistic.mean()
+        return cast(Tensor, statistic.mean())
 
     def forward(self, proj: Tensor) -> Tensor:
         """Compute the SIGReg loss for a batch of projections.

lightly/utils/lars.py

@@ -101,7 +101,7 @@ def __setstate__(self, state: Dict[str, Any]) -> None:
         for group in self.param_groups:
             group.setdefault("nesterov", False)
 
-    # Type ignore for overloads is required for Python 3.7.
+    # PyTorch's version-dependent overloads do not match these signatures.
     @overload  # type: ignore[override]
     def step(self, closure: None = None) -> None: ...
 

pyproject.toml

@@ -7,7 +7,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name="lightly"
-requires-python = ">=3.6"
+requires-python = ">=3.8"
 authors = [
     {name = "Lightly Team", email = "team@lightly.ai"},
 ]
@@ -26,8 +26,6 @@ classifiers = [
     "Topic :: Software Development :: Libraries",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
@@ -103,7 +101,7 @@ openapi = [
   "aenum>=3.1.11"
 ]
 timm = ["timm>=0.9.9"]
-video = ["av>=8.0.3; python_version>='3.8'"]
+video = ["av>=12.0.0; python_version>='3.8'"]
 matplotlib = ["matplotlib>=3"]
 
 
@@ -135,7 +133,7 @@ lightly = ["lightly/cli/config/*.yaml"]
 
 [tool.ruff]
 line-length = 88
-target-version = "py37"
+target-version = "py38"
 extend-exclude = ["lightly/openapi_generated"]
 
 [tool.ruff.lint]