diff --git a/bayesflow/utils/optimal_transport/log_sinkhorn.py b/bayesflow/utils/optimal_transport/log_sinkhorn.py
index 3538eaeff..9fa6dba26 100644
--- a/bayesflow/utils/optimal_transport/log_sinkhorn.py
+++ b/bayesflow/utils/optimal_transport/log_sinkhorn.py
@@ -1,7 +1,6 @@
 import keras
 
 from .. import logging
-from ..tensor_utils import is_symbolic_tensor
 
 from .euclidean import euclidean
 
@@ -27,9 +26,6 @@ def log_sinkhorn_plan(x1, x2, regularization: float = 1.0, rtol=1e-5, atol=1e-8,
 
     log_plan = cost / -(regularization * keras.ops.mean(cost) + 1e-16)
 
-    if is_symbolic_tensor(log_plan):
-        return log_plan
-
     def contains_nans(plan):
         return keras.ops.any(keras.ops.isnan(plan))
 
@@ -57,22 +53,18 @@ def do_nothing():
         pass
 
     def log_steps():
-        msg = "Log-Sinkhorn-Knopp converged after {:d} steps."
+        msg = "Log-Sinkhorn-Knopp converged after {} steps."
 
         logging.debug(msg, steps)
 
     def warn_convergence():
-        marginals = keras.ops.logsumexp(log_plan, axis=0)
-        deviations = keras.ops.abs(marginals)
-        badness = 100.0 * keras.ops.exp(keras.ops.max(deviations))
-
-        msg = "Log-Sinkhorn-Knopp did not converge after {:d} steps (badness: {:.1f}%)."
+        msg = "Log-Sinkhorn-Knopp did not converge after {} steps."
 
-        logging.warning(msg, max_steps, badness)
+        logging.warning(msg, max_steps)
 
     def warn_nans():
-        msg = "Log-Sinkhorn-Knopp produced NaNs."
-        logging.warning(msg)
+        msg = "Log-Sinkhorn-Knopp produced NaNs after {} steps."
+        logging.warning(msg, steps)
 
     keras.ops.cond(contains_nans(log_plan), warn_nans, do_nothing)
     keras.ops.cond(is_converged(log_plan), log_steps, warn_convergence)
diff --git a/bayesflow/utils/optimal_transport/sinkhorn.py b/bayesflow/utils/optimal_transport/sinkhorn.py
index 1efa5ae0b..04c268eb0 100644
--- a/bayesflow/utils/optimal_transport/sinkhorn.py
+++ b/bayesflow/utils/optimal_transport/sinkhorn.py
@@ -3,7 +3,6 @@
 from bayesflow.types import Tensor
 
 from .. import logging
-from ..tensor_utils import is_symbolic_tensor
 
 from .euclidean import euclidean
 
@@ -76,9 +75,6 @@ def sinkhorn_plan(
     # initialize the transport plan from a gaussian kernel
     plan = keras.ops.exp(cost / -(regularization * keras.ops.mean(cost) + 1e-16))
 
-    if is_symbolic_tensor(plan):
-        return plan
-
     def contains_nans(plan):
         return keras.ops.any(keras.ops.isnan(plan))
 
@@ -106,22 +102,18 @@ def do_nothing():
         pass
 
     def log_steps():
-        msg = "Sinkhorn-Knopp converged after {:d} steps."
+        msg = "Sinkhorn-Knopp converged after {} steps."
 
         logging.info(msg, max_steps)
 
     def warn_convergence():
-        marginals = keras.ops.sum(plan, axis=0)
-        deviations = keras.ops.abs(marginals - 1.0)
-        badness = 100.0 * keras.ops.max(deviations)
-
-        msg = "Sinkhorn-Knopp did not converge after {:d} steps (badness: {:.1f}%)."
+        msg = "Sinkhorn-Knopp did not converge after {}."
 
-        logging.warning(msg, max_steps, badness)
+        logging.warning(msg, max_steps)
 
     def warn_nans():
-        msg = "Sinkhorn-Knopp produced NaNs."
-        logging.warning(msg)
+        msg = "Sinkhorn-Knopp produced NaNs after {} steps."
+        logging.warning(msg, steps)
 
     keras.ops.cond(contains_nans(plan), warn_nans, do_nothing)
     keras.ops.cond(is_converged(plan), log_steps, warn_convergence)
diff --git a/tests/test_examples/test_examples.py b/tests/test_examples/test_examples.py
index 245052636..40135627a 100644
--- a/tests/test_examples/test_examples.py
+++ b/tests/test_examples/test_examples.py
@@ -9,6 +9,7 @@ def test_bayesian_experimental_design(examples_path):
     run_notebook(examples_path / "Bayesian_Experimental_Design.ipynb")
 
 
+@pytest.mark.skip(reason="requires setting up pyabc")
 @pytest.mark.slow
 def test_from_abc_to_bayesflow(examples_path):
     run_notebook(examples_path / "From_ABC_to_BayesFlow.ipynb")