Remove the _clean() function as now predictN won't modify the model o…

…bject and _clean() is useless.

pydlm/dlm.py

@@ -202,9 +202,6 @@ def fitForwardFilter(self, useRollingWindow=False, windowLength=3):
         self.turnOn('filtered plot')
         self.turnOn('predict plot')
 
-        # reset everything that needs reset
-        self._clean()
-
         if self._printInfo:
             print('Forward filtering completed.')
 
@@ -250,9 +247,6 @@ def fitBackwardSmoother(self, backLength=None):
         self.result.smoothedSteps = [self.n - backLength, self.n - 1]
         self.turnOn('smoothed plot')
 
-        # reset everything that needs reset
-        self._clean()
-
         if self._printInfo:
             print('Backward smoothing completed.')
 
@@ -679,7 +673,7 @@ def exportBuilder():
         if length(self.builder.dynamicComponents) > 0:
             raise ValueError('Cannot export dlm builder with dynamic components.')
 
-        return self.builder
+        return deepcopy(self.builder)
 
 # ======================= data appending, popping and altering ===============
 
@@ -726,9 +720,6 @@ def append(self, data, component='main'):
         else:
             raise NameError('Such dynamic component does not exist.')
 
-        # reset everything that needs reset
-        self._clean()
-
     # pop the data of a specific date out
     def popout(self, date):
         """ Pop out the data for a given date
@@ -768,9 +759,6 @@ def popout(self, date):
         elif self.result.smoothedSteps[0] > self.result.smoothedSteps[1]:
             self.result.smoothedSteps = [0, -1]
 
-        # reset everything that needs reset
-        self._clean()
-
     # alter the data of a specific days
     def alter(self, date, data, component='main'):
         """ To alter the data for a specific date and a specific component.
@@ -822,9 +810,6 @@ def alter(self, date, data, component='main'):
         elif self.result.smoothedSteps[0] > self.result.smoothedSteps[1]:
             self.result.smoothedSteps = [0, -1]
 
-        # reset everything that needs reset
-        self._clean()
-
     # ignore the data of a given date
     def ignore(self, date):
         """ Ignore the data for a specific day. treat it as missing data

pydlm/func/_dlm.py

@@ -608,13 +608,6 @@ def _printSystemInfo(self, yes):
             self._printInfo = False
             self.builder._printInfo = False
 
-    def _clean(self):
-        """ Clean up everything that needs to be reset. A common
-        place to take care of of them.
-
-        """
-        self.result.predictStatus = None
-
     # function to judge whether a component is in the model
     def _checkComponent(self, name):
         """ Check whether a component is contained by the dlm.