fix: changed field initialization to default_factory

ssax/objectives/synthetic.py

@@ -60,7 +60,8 @@ class Beale(ObjectiveFn):
 
     dim: int = 2
     optimal_value: float = 0.0
-    optimizers: jax.Array = jnp.array([(3.0, 0.5)])
+    optimizers: jax.Array = struct.field(default_factory=lambda: jnp.array([(3.0, 0.5)]))
+
 
     @classmethod
     def create(cls, 
@@ -85,7 +86,7 @@ class Branin(ObjectiveFn):
 
     dim: int = 2
     optimal_value: float = 0.397887
-    optimizers: jax.Array = jnp.array([(-jnp.pi, 12.275), (jnp.pi, 2.275), (9.42478, 2.475)])
+    optimizers: jax.Array = struct.field(default_factory=lambda: jnp.array([(-jnp.pi, 12.275), (jnp.pi, 2.275), (9.42478, 2.475)]))
 
     @classmethod
     def create(cls, 
@@ -113,7 +114,7 @@ class Bukin(ObjectiveFn):
 
     dim: int = 2
     optimal_value: float = 0.0
-    optimizers: jnp.array = jnp.array([(-10.0, 1.0)])
+    optimizers: jax.Array = struct.field(default_factory=lambda: jnp.array([(-10.0, 1.0)]))
 
     @classmethod
     def create(cls, 
@@ -136,7 +137,7 @@ class Cosine8(ObjectiveFn):
 
     dim: int = 8
     optimal_value: float = 0.8
-    optimizers: jnp.array = jnp.zeros(8)
+    optimizers: jax.Array = struct.field(default_factory=lambda: jnp.zeros(8))
 
     @classmethod
     def create(cls, 
@@ -157,7 +158,7 @@ class DropWave(ObjectiveFn):
 
     dim: int = 2
     optimal_value: float = -1.0
-    optimizers: jnp.array = jnp.zeros(2)
+    optimizers: jax.Array = struct.field(default_factory=lambda: jnp.zeros(2))
 
     @classmethod
     def create(cls, 
@@ -181,7 +182,7 @@ class EggHolder(ObjectiveFn):
 
     dim: int = 2
     optimal_value: float = -959.6407
-    optimizers: jnp.array = jnp.array([(512.0, 404.2319)])
+    optimizers: jax.Array = struct.field(default_factory=lambda: jnp.array([(512.0, 404.2319)]))
 
     @classmethod
     def create(cls, 
@@ -205,12 +206,12 @@ class HolderTable(ObjectiveFn):
 
     dim: int = 2
     optimal_value: float = -19.2085
-    optimizers: jnp.array = jnp.array([
+    optimizers: jax.Array = struct.field(default_factory=lambda: jnp.array([
         (8.05502, 9.66459),
         (-8.05502, -9.66459),
         (-8.05502, 9.66459),
         (8.05502, -9.66459),
-    ])
+    ]))
 
     @classmethod
     def create(cls, 
@@ -234,7 +235,7 @@ class SixHumpCamel(ObjectiveFn):
 
     dim: int = 2
     optimal_value: float = -1.0316
-    optimizers: jnp.array = jnp.array([(0.0898, -0.7126), (-0.0898, 0.7126)])
+    optimizers: jax.Array = struct.field(default_factory=lambda: jnp.array([(0.0898, -0.7126), (-0.0898, 0.7126)]))
 
     @classmethod
     def create(cls, 
@@ -260,7 +261,7 @@ class ThreeHumpCamel(ObjectiveFn):
 
     dim: int = 2
     optimal_value: float = 0.0
-    optimizers: jnp.array = jnp.array([(0.0, 0.0)])
+    optimizers: jax.Array = struct.field(default_factory=lambda: jnp.array([(0.0, 0.0)]))
 
     @classmethod
     def create(cls, 
@@ -369,7 +370,7 @@ class Michalewicz(ObjectiveFn):
 
     dim: int = 2  # NOTE: hard fixed dim = 2 for now
     optimal_value: float = -1.8013
-    optimizers: jnp.array = jnp.array([(2.20290552, 1.57079633)])
+    optimizers: jax.Array = struct.field(default_factory=lambda: jnp.array([(2.20290552, 1.57079633)]))
 
     @classmethod
     def create(cls,