Allow pydantic v2 using transitional v1 support

requirements.txt

@@ -9,7 +9,7 @@ catalogue>=2.0.4,<2.1.0
 confection>=0.0.1,<1.0.0
 ml_datasets>=0.2.0,<0.3.0; python_version < "3.11"
 # Third-party dependencies
-pydantic>=1.7.4,!=1.8,!=1.8.1,<1.11.0
+pydantic>=1.7.4,!=1.8,!=1.8.1,<3.0.0
 numpy>=1.15.0; python_version < "3.9"
 numpy>=1.19.0; python_version >= "3.9"
 packaging>=20.0

setup.cfg

@@ -51,7 +51,7 @@ install_requires =
     setuptools
     numpy>=1.15.0; python_version < "3.9"
     numpy>=1.19.0; python_version >= "3.9"
-    pydantic>=1.7.4,!=1.8,!=1.8.1,<1.11.0
+    pydantic>=1.7.4,!=1.8,!=1.8.1,<3.0.0
     packaging>=20.0
     # Backports of modern Python features
     dataclasses>=0.6,<1.0; python_version < "3.7"

thinc/tests/test_config.py

@@ -6,7 +6,11 @@
 import catalogue
 import numpy
 import pytest
-from pydantic import BaseModel, PositiveInt, StrictBool, StrictFloat, constr
+
+try:
+    from pydantic.v1 import BaseModel, PositiveInt, StrictBool, StrictFloat, constr
+except ImportError:
+    from pydantic import BaseModel, PositiveInt, StrictBool, StrictFloat, constr  # type: ignore
 
 import thinc.config
 from thinc.api import Config, Model, NumpyOps, RAdam

thinc/tests/test_types.py

@@ -1,6 +1,11 @@
 import numpy
 import pytest
-from pydantic import ValidationError, create_model
+
+try:
+    from pydantic.v1 import ValidationError, create_model
+except ImportError:
+    from pydantic import ValidationError, create_model  # type: ignore
+
 
 from thinc.types import (
     Floats1d,

thinc/util.py

@@ -24,7 +24,12 @@
 
 import numpy
 from packaging.version import Version
-from pydantic import ValidationError, create_model
+
+try:
+    from pydantic.v1 import ValidationError, create_model
+except ImportError:
+    from pydantic import ValidationError, create_model  # type: ignore
+
 from wasabi import table
 
 from .compat import (
@@ -251,7 +256,6 @@ def to_categorical(
     *,
     label_smoothing: float = 0.0,
 ) -> FloatsXd:
-
     if n_classes is None:
         n_classes = int(numpy.max(Y) + 1)  # type: ignore