Switch Grid1D to pydantic model.

PiperOrigin-RevId: 726028947

torax/geometry/geometry.py

@@ -25,11 +25,11 @@
 import jax
 import jax.numpy as jnp
 import numpy as np
-from torax import jax_utils
+import pydantic
+from torax.torax_pydantic import torax_pydantic
 
 
-@chex.dataclass(frozen=True)
-class Grid1D:
+class Grid1D(torax_pydantic.BaseModelFrozen):
   """Data structure defining a 1-D grid of cells with faces.
 
   Construct via `construct` classmethod.
@@ -41,16 +41,10 @@ class Grid1D:
     cell_centers: Coordinates of cell centers.
   """
 
-  nx: int
-  dx: float
-  face_centers: chex.Array
-  cell_centers: chex.Array
-
-  def __post_init__(self):
-    jax_utils.assert_rank(self.nx, 0)
-    jax_utils.assert_rank(self.dx, 0)
-    jax_utils.assert_rank(self.face_centers, 1)
-    jax_utils.assert_rank(self.cell_centers, 1)
+  nx: pydantic.PositiveInt
+  dx: pydantic.PositiveFloat
+  face_centers: torax_pydantic.NumpyArray1D
+  cell_centers: torax_pydantic.NumpyArray1D
 
   def __eq__(self, other: Grid1D) -> bool:
     return (
@@ -248,7 +242,7 @@ def g1_over_vpr_face(self) -> jax.Array:
 
   @property
   def g1_over_vpr2_face(self) -> jax.Array:
-    bulk = self.g1_face[..., 1:] / self.vpr_face[..., 1:]**2
+    bulk = self.g1_face[..., 1:] / self.vpr_face[..., 1:] ** 2
     # Correct value on-axis is 1/rho_b**2
     first_element = jnp.ones_like(self.rho_b) / self.rho_b**2
     return jnp.concatenate(
@@ -260,17 +254,15 @@ def z_magnetic_axis(self) -> chex.Numeric:
     if z_magnetic_axis is not None:
       return z_magnetic_axis
     else:
-      raise ValueError(
-          'Geometry does not have a z magnetic axis.'
-      )
+      raise ValueError('Geometry does not have a z magnetic axis.')
 
 
 def stack_geometries(geometries: Sequence[Geometry]) -> Geometry:
   """Batch together a sequence of geometries.
 
   Args:
-    geometries: A sequence of geometries to stack. The geometries must have
-      the same mesh, geometry type.
+    geometries: A sequence of geometries to stack. The geometries must have the
+      same mesh, geometry type.
 
   Returns:
     A Geometry object, where each array attribute has an additional