Update SingleDeviceShardingMetadata equality method to handle CPU device naming string changes.

PiperOrigin-RevId: 893518418

Author: angel-core

checkpoint/orbax/checkpoint/_src/metadata/sharding.py

@@ -325,7 +325,13 @@ def __repr__(self):
     return f'SingleDeviceShardingMetadata(device_str={self.device_str})'
 
   def __eq__(self, other):
-    return self.device_str == other.device_str
+    if not isinstance(other, SingleDeviceShardingMetadata):
+      return False
+    # JAX 0.10 changed CPU devices so they report as cpu:0 not TFRT_CPU_0
+    return (
+        self.device_str.replace('TFRT_CPU_', 'cpu:')
+        == other.device_str.replace('TFRT_CPU_', 'cpu:')
+    )
 
 
 def from_jax_sharding(jax_sharding) -> Optional[ShardingMetadata]:

checkpoint/orbax/checkpoint/_src/metadata/sharding_test.py

@@ -93,12 +93,7 @@ def test_convert_between_jax_single_device_sharding_and_sharding_metadata(
     jax_sharding = jax.sharding.SingleDeviceSharding(
         jax.local_devices(backend="cpu")[0]
     )
-    # JAX used to report its cpu devices as TFRT_CPU_0
     expected_single_device_sharding_metadata = (
-        sharding_metadata.SingleDeviceShardingMetadata(device_str="TFRT_CPU_0")
-    )
-    # ... but now uses cpu:0
-    expected_single_device_sharding_metadata2 = (
         sharding_metadata.SingleDeviceShardingMetadata(device_str="cpu:0")
     )
     converted_single_device_sharding_metadata = (
@@ -109,12 +104,9 @@ def test_convert_between_jax_single_device_sharding_and_sharding_metadata(
         converted_single_device_sharding_metadata,
         sharding_metadata.SingleDeviceShardingMetadata,
     )
-    self.assertIn(
+    self.assertEqual(
         converted_single_device_sharding_metadata,
-        [
-            expected_single_device_sharding_metadata,
-            expected_single_device_sharding_metadata2,
-        ],
+        expected_single_device_sharding_metadata,
     )
 
     # Convert from `SingleDeviceShardingMetadata` to