When using bisimulation with the dd-to-sparse engine, the quotient is automatically extracted in a sparse way.

src/storm-cli-utilities/model-handling.h

@@ -510,7 +510,10 @@ namespace storm {
             STORM_LOG_WARN_COND(!bisimulationSettings.isWeakBisimulationSet(), "Weak bisimulation is currently not supported on DDs. Falling back to strong bisimulation.");
             
             auto quotientFormat = bisimulationSettings.getQuotientFormat();
-
+            if (mpi.engine == storm::utility::Engine::DdSparse && quotientFormat != storm::dd::bisimulation::QuotientFormat::Sparse && bisimulationSettings.isQuotientFormatSetFromDefaultValue()) {
+                STORM_LOG_INFO("Setting bisimulation quotient format to 'sparse'.");
+                quotientFormat = storm::dd::bisimulation::QuotientFormat::Sparse;
+            }
             STORM_LOG_INFO("Performing bisimulation minimization...");
             return storm::api::performBisimulationMinimization<DdType, ValueType, ExportValueType>(model, createFormulasToRespect(input.properties), storm::storage::BisimulationType::Strong, bisimulationSettings.getSignatureMode(), quotientFormat);
         }

src/storm/settings/modules/BisimulationSettings.cpp

@@ -70,6 +70,10 @@ namespace storm {
                 return false;
             }
             
+            bool BisimulationSettings::isQuotientFormatSetFromDefaultValue() const {
+                return !this->getOption(quotientFormatOptionName).getHasOptionBeenSet() || this->getOption(quotientFormatOptionName).getArgumentByName("format").wasSetFromDefaultValue();
+            }
+            
             storm::dd::bisimulation::QuotientFormat BisimulationSettings::getQuotientFormat() const {
                 std::string quotientFormatAsString = this->getOption(quotientFormatOptionName).getArgumentByName("format").getValueAsString();
                 if (quotientFormatAsString == "sparse") {

src/storm/settings/modules/BisimulationSettings.h

@@ -43,6 +43,13 @@ namespace storm {
                  */
                 bool isWeakBisimulationSet() const;
 
+                /*!
+                 * Retrieves whether the format in which the quotient is to be extracted has been set from its default value.
+                 *
+                 * @return True iff it has been set from its default value.
+                 */
+                bool isQuotientFormatSetFromDefaultValue() const;
+                
                 /*!
                  * Retrieves the format in which the quotient is to be extracted.
                  * NOTE: only applies to DD-based bisimulation.