decrease training set bad npe

Author: janfb

tests/lc2st_test.py

@@ -49,7 +49,7 @@ def _create_npe(num_simulations, max_epochs=None):
 
 @pytest.fixture(scope="session")
 def badly_trained_npe(npe_factory):
-    return npe_factory(num_simulations=100, max_epochs=1)
+    return npe_factory(num_simulations=50, max_epochs=1)
 
 
 @pytest.fixture(scope="session")