implement compile_from_config and get_compile_config (#442)

* implement compile_from_config and get_compile_config

* add optimizer build to compile_from_config

Author: LarsKue

bayesflow/approximators/continuous_approximator.py

@@ -104,6 +104,12 @@ def compile(
 
         return super().compile(*args, **kwargs)
 
+    def compile_from_config(self, config):
+        self.compile(**deserialize(config))
+        if hasattr(self, "optimizer") and self.built:
+            # Create optimizer variables.
+            self.optimizer.build(self.trainable_variables)
+
     def compute_metrics(
         self,
         inference_variables: Tensor,
@@ -213,6 +219,16 @@ def get_config(self):
 
         return base_config | serialize(config)
 
+    def get_compile_config(self):
+        base_config = super().get_compile_config() or {}
+
+        config = {
+            "inference_metrics": self.inference_network._metrics,
+            "summary_metrics": self.summary_network._metrics if self.summary_network is not None else None,
+        }
+
+        return base_config | serialize(config)
+
     def estimate(
         self,
         conditions: Mapping[str, np.ndarray],

bayesflow/approximators/model_comparison_approximator.py

@@ -118,6 +118,12 @@ def compile(
 
         return super().compile(*args, **kwargs)
 
+    def compile_from_config(self, config):
+        self.compile(**deserialize(config))
+        if hasattr(self, "optimizer") and self.built:
+            # Create optimizer variables.
+            self.optimizer.build(self.trainable_variables)
+
     def compute_metrics(
         self,
         *,
@@ -262,6 +268,16 @@ def get_config(self):
 
         return base_config | serialize(config)
 
+    def get_compile_config(self):
+        base_config = super().get_compile_config() or {}
+
+        config = {
+            "classifier_metrics": self.classifier_network._metrics,
+            "summary_metrics": self.summary_network._metrics if self.summary_network is not None else None,
+        }
+
+        return base_config | serialize(config)
+
     def predict(
         self,
         *,

bayesflow/metrics/maximum_mean_discrepancy.py

@@ -2,9 +2,11 @@
 
 import keras
 
+from bayesflow.utils.serialization import serializable
 from .functional import maximum_mean_discrepancy
 
 
+@serializable
 class MaximumMeanDiscrepancy(keras.Metric):
     def __init__(
         self,

bayesflow/metrics/root_mean_squard_error.py

@@ -1,10 +1,11 @@
 from functools import partial
 import keras
 
-
+from bayesflow.utils.serialization import serializable
 from .functional import root_mean_squared_error
 
 
+@serializable
 class RootMeanSquaredError(keras.metrics.MeanMetricWrapper):
     def __init__(self, name="root_mean_squared_error", dtype=None, **kwargs):
         fn = partial(root_mean_squared_error, **kwargs)