- Several bugfixes;

-  class Transformation
- Inclusion of cascaded transformations in FTS

benchmarks/Measures.py

@@ -42,9 +42,19 @@ def UStatistic(targets, forecasts):
     naive = []
     y = []
     for k in np.arange(0,l-1):
-        y.append(((forecasts[k+1] - targets[k+1])/targets[k]) ** 2)
-        naive.append(((targets[k + 1] - targets[k]) / targets[k]) ** 2)
-    return np.sqrt(sum(y)/sum(naive))
+        y.append((forecasts[k ] - targets[k ]) ** 2)
+        naive.append((targets[k + 1] - targets[k]) ** 2)
+    return np.sqrt(sum(y) / sum(naive))
+
+
+# Theil’s Inequality Coefficient
+def TheilsInequality(targets, forecasts):
+    res = targets - forecasts
+    t = len(res)
+    us = np.sqrt(sum([u**2 for u in res]))
+    ys = np.sqrt(sum([y**2 for y in targets]))
+    fs = np.sqrt(sum([f**2 for f in forecasts]))
+    return  us / (ys + fs)
 
 
 # Q Statistic for Box-Pierce test

benchmarks/ResidualAnalysis.py

@@ -19,7 +19,6 @@ def ChiSquared(q,h):
     return p
 
 
-
 def compareResiduals(data, models):
     ret = "Model		& Order     & Mean      & STD       & Box-Pierce    & Box-Ljung & P-value \\\\ \n"
     for mfts in models:
@@ -29,12 +28,12 @@ def compareResiduals(data, models):
         sig = np.std(res)
         ret += mfts.shortname + "		& "
         ret += str(mfts.order) + "		& "
-        ret += str(mu) + "		& "
-        ret += str(sig) + "		& "
+        ret += str(round(mu,2)) + "		& "
+        ret += str(round(sig,2)) + "		& "
         q1 = Measures.BoxPierceStatistic(res, 10)
-        ret += str(q1) + "		& "
+        ret += str(round(q1,2)) + "		& "
         q2 = Measures.BoxLjungStatistic(res, 10)
-        ret += str(q2) + "		& "
+        ret += str(round(q2,2)) + "		& "
         ret += str(ChiSquared(q2, 10))
         ret += "	\\\\ \n"
     return ret

benchmarks/benchmarks.py

@@ -14,7 +14,8 @@ from pyFTS.common import Membership, FuzzySet, FLR, Transformations, Util
 from pyFTS import fts, chen, yu, ismailefendi, sadaei, hofts, hwang, pfts, ifts
 
 
-def allPointForecasters(data_train, data_test, partitions, max_order=3,save=False, file=None, tam=[20, 5]):
+def allPointForecasters(data_train, data_test, partitions, max_order=3, statistics=True, residuals=True, series=True,
+                        save=False, file=None, tam=[20, 5]):
     models = [naive.Naive, chen.ConventionalFTS, yu.WeightedFTS, ismailefendi.ImprovedWeightedFTS,
               sadaei.ExponentialyWeightedFTS, hofts.HighOrderFTS,  pfts.ProbabilisticFTS]
 
@@ -44,24 +45,27 @@ def allPointForecasters(data_train, data_test, partitions, max_order=3,save=Fals
                     colors.append(all_colors[count])
         count += 10
 
+    if statistics:
         print(getPointStatistics(data_test, objs))
 
+    if residuals:
         print(ResidualAnalysis.compareResiduals(data_test, objs))
+        ResidualAnalysis.plotResiduals(data_test, objs, save=save, file=file, tam=[tam[0], 5 * tam[1]])
 
+    if series:
         plotComparedSeries(data_test, objs, colors, typeonlegend=False, save=save, file=file, tam=tam,  intervals=False)
 
-    ResidualAnalysis.plotResiduals(data_test, objs, save=save, file=file, tam=[tam[0],5*tam[1]])
-
 
 def getPointStatistics(data, models, externalmodels = None, externalforecasts = None):
-    ret = "Model		& Order     & RMSE		& MAPE      & Theil's U			\\\\ \n"
+    ret = "Model		& Order     & RMSE		& MAPE      & Theil's U		& Theil's I	\\\\ \n"
     for fts in models:
         forecasts = fts.forecast(data)
         ret += fts.shortname + "		& "
         ret += str(fts.order) + "		& "
         ret += str(round(Measures.rmse(np.array(data[fts.order:]), np.array(forecasts[:-1])), 2)) + "		& "
         ret += str(round(Measures.mape(np.array(data[fts.order:]), np.array(forecasts[:-1])), 2))+ "		& "
-        ret += str(round(Measures.UStatistic(np.array(data[fts.order:]), np.array(forecasts[:-1])), 2))
+        ret += str(round(Measures.UStatistic(np.array(data[fts.order:]), np.array(forecasts[:-1])), 2))+ "		& "
+        ret += str(round(Measures.TheilsInequality(np.array(data[fts.order:]), np.array(forecasts[:-1])), 4))
         ret += "	\\\\ \n"
     if externalmodels is not None:
         l = len(externalmodels)

benchmarks/naive.py

@@ -12,3 +12,4 @@ class Naive(fts.FTS):
 
     def forecast(self, data):
         return [k for k in data]
+

common/Transformations.py

@@ -3,12 +3,41 @@ import math
 from pyFTS import *
 
 
-def differential(original, lags=1):
-    n = len(original)
-    diff = [original[t - lags] - original[t] for t in np.arange(lags, n)]
-    for t in np.arange(0, lags): diff.insert(0, 0)
+class Transformation(object):
+
+    def __init__(self, parameters):
+        self.isInversible = True
+        self.parameters = parameters
+
+    def apply(self,data,param):
+        pass
+
+    def inverse(self,data, param):
+        pass
+
+    def __str__(self):
+        return self.__class__.__name__ + '(' + str(self.parameters) + ')'
+
+
+class Differential(Transformation):
+
+    def __init__(self, parameters):
+        super(Differential, self).__init__(parameters)
+        self.lag = parameters
+
+    def apply(self, data, param=None):
+        if param is not None:
+            self.lag = param
+        n = len(data)
+        diff = [data[t - self.lag] - data[t] for t in np.arange(self.lag, n)]
+        for t in np.arange(0, self.lag): diff.insert(0, 0)
         return np.array(diff)
 
+    def inverse(self,data, param):
+        n = len(data)
+        inc = [data[t] + param[t] for t in np.arange(1, n)]
+        return np.array(inc)
+
 
 def boxcox(original, plambda):
     n = len(original)

fts.py

@@ -17,6 +17,8 @@ class FTS(object):
         self.hasIntervalForecasting = False
         self.hasDistributionForecasting = False
         self.dump = False
+        self.transformations = []
+        self.transformations_param = []
 
     def fuzzy(self, data):
         best = {"fuzzyset": "", "membership": 0.0}
@@ -54,6 +56,31 @@ class FTS(object):
         ret = np.array([s.centroid for s in flrg.RHS])
         return ret
 
+    def appendTransformation(self, transformation):
+        self.transformations.append(transformation)
+
+    def doTransformations(self,data,params=None):
+        ndata = data
+        if params is None:
+            params = [ None for k in self.transformations]
+        c = 0
+        for t in self.transformations:
+            ndata = t.apply(ndata,params[c])
+            c += 1
+
+        return ndata
+
+    def doInverseTransformations(self,data,params=None):
+        ndata = data
+        if params is None:
+            params = [None for k in self.transformations]
+        c = 0
+        for t in reversed(self.transformations):
+            ndata = t.inverse(ndata, params[c])
+            c += 1
+
+        return ndata
+
     def __str__(self):
         tmp = self.name + ":\n"
         for r in sorted(self.flrgs):