Merge pull request #339 from vpratz/fix-coupling-flow-warning

Fix unused weights warning in coupling flow

bayesflow/networks/mlp/hidden_block.py

@@ -51,7 +51,7 @@ def call(self, inputs: Tensor, training: bool = False, **kwargs) -> Tensor:
     def build(self, input_shape):
         self.dense.build(input_shape)
 
-        if input_shape[-1] != self.units:
+        if input_shape[-1] != self.units and self.residual:
             self.projector = self.add_weight(
                 shape=(input_shape[-1], self.units), initializer="glorot_uniform", trainable=True, name="projector"
             )