[6.3][ML] Fix issues upgrading state leading to possible abort of the autodetect process

docs/CHANGELOG.asciidoc

@@ -33,8 +33,8 @@
 * Add control message to start background persistence {ml-pull}19[#19]
 * Fail start up if state is missing {ml-pull}4[#4]
 * Do not log incorrect model memory limit {ml-pull}3[#3]
+* The trend decomposition state wasn't being correctly upgraded potentially causing the autodetect process to abort {ml-pull}136[#136] (issue: {ml-issue}135[#135])
 
 === Regressions
 
 === Known Issues
-

include/core/CStateMachine.h

@@ -15,6 +15,7 @@
 
 #include <cstddef>
 #include <list>
+#include <map>
 #include <vector>
 
 namespace ml {
@@ -67,6 +68,7 @@ class CORE_EXPORT CStateMachine {
     using TSizeVec = std::vector<std::size_t>;
     using TSizeVecVec = std::vector<TSizeVec>;
     using TStrVec = std::vector<std::string>;
+    using TSizeSizeMap = std::map<std::size_t, std::size_t>;
 
 public:
     //! Set the number of machines we expect the program to use.
@@ -85,7 +87,8 @@ class CORE_EXPORT CStateMachine {
     //! \name Persistence
     //@{
     //! Initialize by reading state from \p traverser.
-    bool acceptRestoreTraverser(CStateRestoreTraverser& traverser);
+    bool acceptRestoreTraverser(CStateRestoreTraverser& traverser,
+                                const TSizeSizeMap& mapping = TSizeSizeMap());
 
     //! Persist state by passing information to the supplied inserter.
     void acceptPersistInserter(CStatePersistInserter& inserter) const;

lib/core/CStateMachine.cc

@@ -25,7 +25,7 @@ namespace core {
 namespace {
 
 // CStateMachine
-const std::string MACHINE_TAG("a");
+//const std::string MACHINE_TAG("a"); No longer used
 const std::string STATE_TAG("b");
 
 // CStateMachine::SMachine
@@ -88,17 +88,26 @@ CStateMachine CStateMachine::create(const TStrVec& alphabet,
     return result;
 }
 
-bool CStateMachine::acceptRestoreTraverser(core::CStateRestoreTraverser& traverser) {
+bool CStateMachine::acceptRestoreTraverser(core::CStateRestoreTraverser& traverser,
+                                           const TSizeSizeMap& mapping) {
     do {
         const std::string& name = traverser.name();
-        RESTORE_BUILT_IN(MACHINE_TAG, m_Machine)
         RESTORE_BUILT_IN(STATE_TAG, m_State)
     } while (traverser.next());
+    if (mapping.size() > 0) {
+        auto mapped = mapping.find(m_State);
+        if (mapped != mapping.end()) {
+            m_State = mapped->second;
+        } else {
+            LOG_ERROR(<< "Bad mapping '" << core::CContainerPrinter::print(mapping)
+                      << "' state = " << m_State);
+            return false;
+        }
+    }
     return true;
 }
 
 void CStateMachine::acceptPersistInserter(core::CStatePersistInserter& inserter) const {
-    inserter.insertValue(MACHINE_TAG, m_Machine);
     inserter.insertValue(STATE_TAG, m_State);
 }
 
@@ -201,14 +210,15 @@ void CStateMachine::CMachineDeque::capacity(std::size_t capacity) {
     m_Capacity = capacity;
 }
 
-const CStateMachine::SMachine& CStateMachine::CMachineDeque::operator[](std::size_t pos) const {
+const CStateMachine::SMachine& CStateMachine::CMachineDeque::operator[](std::size_t pos_) const {
+    std::size_t pos{pos_};
     for (const auto& machines : m_Machines) {
         if (pos < machines.size()) {
             return machines[pos];
         }
         pos -= machines.size();
     }
-    LOG_ABORT(<< "Invalid index '" << pos << "'");
+    LOG_ABORT(<< "Invalid index '" << pos_ << "'");
 }
 
 std::size_t CStateMachine::CMachineDeque::size() const {

lib/core/unittest/CStateMachineTest.cc

@@ -173,10 +173,11 @@ void CStateMachineTest::testPersist() {
     core::CRapidXmlStateRestoreTraverser traverser(parser);
 
     core::CStateMachine restored = core::CStateMachine::create(
-        machine[1].s_Alphabet, machine[1].s_States, machine[1].s_TransitionFunction,
+        machine[0].s_Alphabet, machine[0].s_States, machine[0].s_TransitionFunction,
         0); // initial state
-    traverser.traverseSubLevel(
-        boost::bind(&core::CStateMachine::acceptRestoreTraverser, &restored, _1));
+    traverser.traverseSubLevel([&restored](core::CStateRestoreTraverser& traverser_) {
+        return restored.acceptRestoreTraverser(traverser_);
+    });
 
     CPPUNIT_ASSERT_EQUAL(original.checksum(), restored.checksum());
     std::string newXml;

lib/maths/CTimeSeriesDecompositionDetail.cc

@@ -43,6 +43,8 @@
 
 #include <algorithm>
 #include <cmath>
+#include <map>
+#include <numeric>
 #include <string>
 #include <vector>
 
@@ -57,6 +59,7 @@ using TBoolVec = std::vector<bool>;
 using TDoubleVec = std::vector<double>;
 using TSizeVec = std::vector<std::size_t>;
 using TSizeVecVec = std::vector<TSizeVec>;
+using TSizeSizeMap = std::map<std::size_t, std::size_t>;
 using TStrVec = std::vector<std::string>;
 using TTimeVec = std::vector<core_t::TTime>;
 using TTimeTimePr = std::pair<core_t::TTime, core_t::TTime>;
@@ -307,7 +310,7 @@ const std::string LAST_UPDATE_OLD_TAG{"j"};
 
 //////////////////////// Upgrade to Version 6.3 ////////////////////////
 
-const double MODEL_WEIGHT_UPGRADING_TO_VERSION_6p3{48.0};
+const double MODEL_WEIGHT_UPGRADING_TO_VERSION_6_3{48.0};
 
 bool upgradeTrendModelToVersion6p3(const core_t::TTime bucketLength,
                                    CTrendComponent& trend,
@@ -330,7 +333,7 @@ bool upgradeTrendModelToVersion6p3(const core_t::TTime bucketLength,
 
     // Generate some samples from the old trend model.
 
-    double weight{MODEL_WEIGHT_UPGRADING_TO_VERSION_6p3 *
+    double weight{MODEL_WEIGHT_UPGRADING_TO_VERSION_6_3 *
                   static_cast<double>(bucketLength) / static_cast<double>(4 * WEEK)};
 
     CPRNG::CXorOShiro128Plus rng;
@@ -343,6 +346,18 @@ bool upgradeTrendModelToVersion6p3(const core_t::TTime bucketLength,
     return true;
 }
 
+// This implements the mapping from restored states to their best
+// equivalents; specifically:
+// SC_NEW_COMPONENTS |-> SC_NEW_COMPONENTS
+// SC_NORMAL |-> SC_NORMAL
+// SC_FORECASTING |-> SC_NORMAL
+// SC_DISABLED |-> SC_DISABLED
+// SC_ERROR |-> SC_ERROR
+// Note that we don't try and restore the periodicity test state
+// (see CTimeSeriesDecomposition::acceptRestoreTraverser) and the
+// calendar test state is unchanged.
+const TSizeSizeMap SC_STATES_UPGRADING_TO_VERSION_6_3{{0, 0}, {1, 1}, {2, 1}, {3, 2}, {4, 3}};
+
 ////////////////////////////////////////////////////////////////////////
 
 // Constants
@@ -482,8 +497,9 @@ bool CTimeSeriesDecompositionDetail::CPeriodicityTest::acceptRestoreTraverser(
     do {
         const std::string& name{traverser.name()};
         RESTORE(PERIODICITY_TEST_MACHINE_6_3_TAG,
-                traverser.traverseSubLevel(boost::bind(
-                    &core::CStateMachine::acceptRestoreTraverser, &m_Machine, _1)))
+                traverser.traverseSubLevel([this](core::CStateRestoreTraverser& traverser_) {
+                    return m_Machine.acceptRestoreTraverser(traverser_);
+                }))
         RESTORE_SETUP_TEARDOWN(
             SHORT_WINDOW_6_3_TAG, m_Windows[E_Short].reset(this->newWindow(E_Short)),
             m_Windows[E_Short] && traverser.traverseSubLevel(boost::bind(
@@ -759,8 +775,9 @@ bool CTimeSeriesDecompositionDetail::CCalendarTest::acceptRestoreTraverser(core:
     do {
         const std::string& name{traverser.name()};
         RESTORE(CALENDAR_TEST_MACHINE_6_3_TAG,
-                traverser.traverseSubLevel(boost::bind(
-                    &core::CStateMachine::acceptRestoreTraverser, &m_Machine, _1)))
+                traverser.traverseSubLevel([this](core::CStateRestoreTraverser& traverser_) {
+                    return m_Machine.acceptRestoreTraverser(traverser_);
+                }))
         RESTORE_BUILT_IN(LAST_MONTH_6_3_TAG, m_LastMonth);
         RESTORE_SETUP_TEARDOWN(
             CALENDAR_TEST_6_3_TAG, m_Test.reset(new CCalendarCyclicTest(m_DecayRate)),
@@ -963,8 +980,9 @@ bool CTimeSeriesDecompositionDetail::CComponents::acceptRestoreTraverser(core::C
         while (traverser.next()) {
             const std::string& name{traverser.name()};
             RESTORE(COMPONENTS_MACHINE_6_3_TAG,
-                    traverser.traverseSubLevel(boost::bind(
-                        &core::CStateMachine::acceptRestoreTraverser, &m_Machine, _1)));
+                    traverser.traverseSubLevel([this](core::CStateRestoreTraverser& traverser_) {
+                        return m_Machine.acceptRestoreTraverser(traverser_);
+                    }))
             RESTORE_BUILT_IN(DECAY_RATE_6_3_TAG, m_DecayRate);
             RESTORE(TREND_6_3_TAG,
                     traverser.traverseSubLevel(boost::bind(
@@ -995,8 +1013,10 @@ bool CTimeSeriesDecompositionDetail::CComponents::acceptRestoreTraverser(core::C
         do {
             const std::string& name{traverser.name()};
             RESTORE(COMPONENTS_MACHINE_OLD_TAG,
-                    traverser.traverseSubLevel(boost::bind(
-                        &core::CStateMachine::acceptRestoreTraverser, &m_Machine, _1)));
+                    traverser.traverseSubLevel([this](core::CStateRestoreTraverser& traverser_) {
+                        return m_Machine.acceptRestoreTraverser(
+                            traverser_, SC_STATES_UPGRADING_TO_VERSION_6_3);
+                    }))
             RESTORE_SETUP_TEARDOWN(TREND_OLD_TAG,
                                    /**/,
                                    traverser.traverseSubLevel(boost::bind(
@@ -1017,7 +1037,7 @@ bool CTimeSeriesDecompositionDetail::CComponents::acceptRestoreTraverser(core::C
                 /**/)
         } while (traverser.next());
 
-        m_MeanVarianceScale.add(1.0, MODEL_WEIGHT_UPGRADING_TO_VERSION_6p3);
+        m_MeanVarianceScale.add(1.0, MODEL_WEIGHT_UPGRADING_TO_VERSION_6_3);
     }
     return true;
 }
@@ -1679,6 +1699,7 @@ bool CTimeSeriesDecompositionDetail::CComponents::SSeasonal::acceptRestoreTraver
             RESTORE(ERRORS_OLD_TAG,
                     core::CPersistUtils::restore(ERRORS_OLD_TAG, s_PredictionErrors, traverser))
         } while (traverser.next());
+        s_PredictionErrors.resize(s_Components.size());
     }
     return true;
 }
@@ -1907,6 +1928,7 @@ bool CTimeSeriesDecompositionDetail::CComponents::SCalendar::acceptRestoreTraver
             RESTORE(ERRORS_OLD_TAG,
                     core::CPersistUtils::restore(ERRORS_OLD_TAG, s_PredictionErrors, traverser))
         } while (traverser.next());
+        s_PredictionErrors.resize(s_Components.size());
     }
     return true;
 }

lib/maths/unittest/CTimeSeriesDecompositionTest.cc

@@ -2108,6 +2108,9 @@ void CTimeSeriesDecompositionTest::testUpgrade() {
     // Check we can validly upgrade existing state.
 
     using TStrVec = std::vector<std::string>;
+    using TDouble3Vec = core::CSmallVector<double, 3>;
+    using TDouble3VecVec = std::vector<TDouble3Vec>;
+
     auto load = [](const std::string& name, std::string& result) {
         std::ifstream file;
         file.open(name);
@@ -2186,6 +2189,13 @@ void CTimeSeriesDecompositionTest::testUpgrade() {
             CPPUNIT_ASSERT_DOUBLES_EQUAL(expectedScale.second, scale.second,
                                          0.005 * std::max(expectedScale.second, 0.4));
         }
+
+        // Check some basic operations on the upgraded model.
+        TDouble3VecVec forecast;
+        decomposition.forecast(60480000, 60480000 + WEEK, HALF_HOUR, 90.0, 1.0, forecast);
+        for (core_t::TTime time = 60480000; time < 60480000 + WEEK; time += HALF_HOUR) {
+            decomposition.addPoint(time, 10.0);
+        }
     }
 
     LOG_DEBUG(<< "*** Trend and Seasonal Components ***");
@@ -2268,6 +2278,13 @@ void CTimeSeriesDecompositionTest::testUpgrade() {
         LOG_DEBUG(<< "Mean scale error = " << maths::CBasicStatistics::mean(meanScaleError));
         CPPUNIT_ASSERT(maths::CBasicStatistics::mean(meanValueError) < 0.06);
         CPPUNIT_ASSERT(maths::CBasicStatistics::mean(meanScaleError) < 0.07);
+
+        // Check some basic operations on the upgraded model.
+        TDouble3VecVec forecast;
+        decomposition.forecast(10366200, 10366200 + WEEK, HALF_HOUR, 90.0, 1.0, forecast);
+        for (core_t::TTime time = 60480000; time < 60480000 + WEEK; time += HALF_HOUR) {
+            decomposition.addPoint(time, 10.0);
+        }
     }
 }