feat: Switch type checker from mypy to ty

.dockerignore

@@ -3,7 +3,7 @@
 **/logs
 **/tests
 **/__pycache__
-**/.mypy_cache
+**/.ty_cache
 **/.pytest_cache
 **/.vscode
 **/junit

.gitignore

@@ -145,10 +145,8 @@ venv.bak/
 # mkdocs documentation
 /site
 
-# mypy
-.mypy_cache/
-.dmypy.json
-dmypy.json
+# ty
+.ty_cache/
 
 # Pyre type checker
 .pyre/

README.md

@@ -40,6 +40,7 @@ Another challenge you may face is each data scientist creating a low quality cod
 - Multiple Dev Container samples (both CPU and GPU) with many common config steps already configured as following:
   - Automated code quality checks (linter and auto formatter) and automated fix when possible with ruff on VSCode on save
   - Automated code quality checks (linter and auto formatter) with ruff as precommit hook
+  - Type checking with [ty](https://github.com/astral-sh/ty) integrated as a VSCode extension for real-time feedback in the editor. ty is chosen over mypy for its significantly faster performance. ty is not included in CI or pre-commit hooks because it is still [pre-1.0](https://github.com/astral-sh/ty#version-policy) with no stable API ([milestones](https://github.com/astral-sh/ty/milestones)), meaning diagnostics may change between versions. Once ty stabilizes, the recommendation is to run it in CI in non-strict mode to catch real type errors without requiring full annotation coverage.
   - Zero effort transition from local env to Azure Machine Learning (cloud based env) by leveraging the same Dockerfile
   - Pre-configured VSCode extensions installed such as python, jupyter, shellcheck, code-spell-checker, git tools etc
 - [Github Actions and Azure DevOps CI pipelines](#ci-pipeline) that run linter (ruff) and pytest with test result reporting and coverage reporting
@@ -226,6 +227,7 @@ ssh-add
 ## Future Roadmap
 
 - Add Docker build caching to Azure DevOps MS hosted CI pipeline
+- Once [ty reaches stable](https://github.com/astral-sh/ty/milestones), add type checking to CI and pre-commit hooks in non-strict mode (default rule set) to catch real type errors without requiring full annotation coverage
 
 ## Contributing
 

notebooks/.devcontainer/devcontainer.json

@@ -36,7 +36,7 @@
                 "marchiore.csvtomarkdown",
                 "mechatroner.rainbow-csv",
                 "ms-azure-devops.azure-pipelines",
-                "ms-python.mypy-type-checker",
+                "astral-sh.ty",
                 "ms-python.python",
                 "ms-toolsai.jupyter",
                 "ms-vsliveshare.vsliveshare",
@@ -49,7 +49,9 @@
             ],
             "settings": {
                 "autoDocstring.docstringFormat": "google",
-                "mypy-type-checker.importStrategy": "fromEnvironment",
+                // ty extension provides its own language server, so disable the one from ms-python.python
+                "python.languageServer": "None",
+                "ty.importStrategy": "fromEnvironment",
                 "python.testing.pytestEnabled": true,
                 "python.defaultInterpreterPath": "/usr/local/bin/python",
                 "[python]": {

notebooks/.devcontainer/pyproject.toml

@@ -10,7 +10,7 @@ dependencies = [
 
 [dependency-groups]
 dev = [
-    "mypy==1.20.0",
+    "ty==0.0.29",
     "pytest==9.0.2",
     "pre-commit==4.5.1",
     "pytest-cov==7.1.0",

src/.amlignore

@@ -3,7 +3,7 @@
 **/logs
 **/tests
 **/__pycache__
-**/.mypy_cache
+**/.ty_cache
 **/.pytest_cache
 **/.vscode
 **/junit

src/sample_cpu_project/.devcontainer/devcontainer.json

@@ -36,7 +36,7 @@
                 "marchiore.csvtomarkdown",
                 "mechatroner.rainbow-csv",
                 "ms-azure-devops.azure-pipelines",
-                "ms-python.mypy-type-checker",
+                "astral-sh.ty",
                 "ms-python.python",
                 "ms-toolsai.jupyter",
                 "ms-vsliveshare.vsliveshare",
@@ -49,7 +49,9 @@
             ],
             "settings": {
                 "autoDocstring.docstringFormat": "google",
-                "mypy-type-checker.importStrategy": "fromEnvironment",
+                // ty extension provides its own language server, so disable the one from ms-python.python
+                "python.languageServer": "None",
+                "ty.importStrategy": "fromEnvironment",
                 "python.testing.pytestEnabled": true,
                 "python.defaultInterpreterPath": "/usr/local/bin/python",
                 "[python]": {

src/sample_cpu_project/.devcontainer/pyproject.toml

@@ -6,7 +6,7 @@ requires-python = ">=3.11"
 [dependency-groups]
 dev = [
     "ipykernel==7.2.0",
-    "mypy==1.20.0",
+    "ty==0.0.29",
     "pytest==9.0.2",
     "pre-commit==4.5.1",
     "pytest-cov==7.1.0",

src/sample_pytorch_gpu_project/.amlignore

@@ -3,7 +3,7 @@
 **/logs
 **/tests
 **/__pycache__
-**/.mypy_cache
+**/.ty_cache
 **/.pytest_cache
 **/.vscode
 **/junit

src/sample_pytorch_gpu_project/.devcontainer/devcontainer.json

@@ -38,7 +38,7 @@
                 "marchiore.csvtomarkdown",
                 "mechatroner.rainbow-csv",
                 "ms-azure-devops.azure-pipelines",
-                "ms-python.mypy-type-checker",
+                "astral-sh.ty",
                 "ms-python.python",
                 "ms-toolsai.jupyter",
                 "ms-vsliveshare.vsliveshare",
@@ -51,7 +51,9 @@
             ],
             "settings": {
                 "autoDocstring.docstringFormat": "google",
-                "mypy-type-checker.importStrategy": "fromEnvironment",
+                // ty extension provides its own language server, so disable the one from ms-python.python
+                "python.languageServer": "None",
+                "ty.importStrategy": "fromEnvironment",
                 "python.testing.pytestEnabled": true,
                 "python.defaultInterpreterPath": "/usr/local/bin/python",
                 "[python]": {

src/sample_pytorch_gpu_project/.devcontainer/pyproject.toml

@@ -13,7 +13,7 @@ dependencies = [
 [dependency-groups]
 dev = [
     "ipykernel==7.2.0",
-    "mypy==1.20.0",
+    "ty==0.0.29",
     "pytest==9.0.2",
     "pre-commit==4.5.1",
     "pytest-cov==7.1.0",