reverted accidental upgrade to python 3.10 to 3.9

.pre-commit-config.yaml

@@ -12,7 +12,7 @@ repos:
   rev: 23.10.0
   hooks:
     - id: black
-      language_version: python3.10
+      language_version: python3.9
       args: ['--config', 'pyproject.toml'] # we want this to refer to `bdai/pyproject.toml`
       verbose: true
 - repo: https://github.com/pre-commit/pre-commit-hooks

pyproject.toml

@@ -12,7 +12,7 @@ authors = [
     {name = "Naoki Yokoyama", email = "[email protected]"},
 ]
 readme = "README.md"
-requires-python = ">=3.10"
+requires-python = ">=3.9"
 dependencies = [
     "torch >= 1.10.1",
     "numpy >= 1.22.4",
@@ -92,8 +92,8 @@ line-length = 120
 # Allow unused variables when underscore-prefixed.
 dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
 
-# Assume Python 3.10
-target-version = "py310"
+# Assume Python 3.9
+target-version = "py39"
 
 [tool.ruff.per-file-ignores]
 "__init__.py" = ["F401"]
@@ -104,7 +104,7 @@ max-complexity = 10
 
 [tool.black]
 line-length = 120
-target-version = ['py310']
+target-version = ['py39']
 include = '\.pyi?$'
 # `extend-exclude` is not honored when `black` is passed a file path explicitly,
 # as is typical when `black` is invoked via `pre-commit`.
@@ -122,7 +122,7 @@ relative_files = true
 
 # mypy configuration
 [tool.mypy]
-python_version = "3.10"
+python_version = "3.9"
 disallow_untyped_defs = true
 ignore_missing_imports = true
 explicit_package_bases = true