def goldenSectionSearch(self, obj, a, b, n):
l = a + 0.382 * (b - a)
h = a + 0.618 * (b - a)
region = b - a
num = 1
while (region > 0.01 and num <= n):
fl = self.lossFunction(obj, l)
fh = self.lossFunction(obj, h)
#print("iter{0} fl={1:.4f} fh{2:.4f}".format(num,fl,fh))
if (fl > fh):
a = l
l = h
h = a + 0.618 * (b - a)
else:
b = h
h = l
l = a + 0.382 * (b - a)
num += 1
region = abs(b - a)
utils.updateProgress(self.__scene) #0.6sec
moveVal = (a + b) / 2
return moveVal
def bruteForceSearch(self, obj, valList):
errList = []
for val in valList:
err = self.lossFunction(obj, val)
errList.append(err)
utils.updateProgress(self.__scene)
minIdx = errList.index(min(errList))
moveVal = valList[minIdx]
return moveVal
def download(title, chapters):
dir = DOWNLOAD+title+os.sep
utils.mkdir_p(dir)
print "Downloading "+title+" (", len(chapters) ,")..."
for chap in chapters:
utils.mkdir_p(dir+str(chap.number))
images = PLUGIN.getImages(chap.link)
for i,img in enumerate(images):
utils.putUrlContent(img.link, dir+str(chap.number)+
os.sep+img.title+utils.getExtension(img.link))
utils.updateProgress(chap.title, int(i*1.0/(len(images)-1)*100))
print ""
file = open(dir+str(chap.number)+os.sep+'.completed', 'w+')
def getTransactions(fileSrc, products):
# main variables to be returned
transactions = []
reverseItemLookup = {}
for key in products:
reverseItemLookup[key[0]] = set()
dataFile = codecs.open(fileSrc, 'rb', 'utf-8') # specify utf-8 encoding
print "Loading Transactions..."
lines = dataFile.readlines() # read all lines
if settings.PROGRESS_BAR == True:
util.updateProgress(0) # create a progress bar
# test every line and extract its relevant information
for idx, line in enumerate(lines): # test each line
if settings.PROGRESS_BAR == True:
util.updateProgress(float(idx) / float(len(lines)))
lineList = line.split(", ")
# Remove first item in the list
lineList.pop(0)
lineSet = set()
for idx2, item in enumerate(lineList):
if float(item) != 0:
# Add the index to our list to indicate that the product has been bought
reverseItemLookup[products[idx2][0]].add(idx)
lineSet.add(idx2)
# append our array to our transactions
transactions.append(lineSet);
if settings.PROGRESS_BAR == True:
util.updateProgress(1)
print "\n"
# return our list of products
return [transactions, reverseItemLookup]
def getProducts(fileSrc):
# main variables to be returned
products = []
dataFile = codecs.open(fileSrc, 'rb', 'utf-8') # specify utf-8 encoding
print "Retrieving products..."
lines = dataFile.readlines() # read all lines
if settings.PROGRESS_BAR == True:
util.updateProgress(0) # create a progress bar
# test every line and extract its relevant information
for idx, line in enumerate(lines): # test each line
if settings.PROGRESS_BAR == True:
util.updateProgress(float(idx) / float(len(lines)))
lineList = line.split(", ")
lineList[1] = float(lineList[1])
products.append(lineList);
if settings.PROGRESS_BAR == True:
util.updateProgress(1)
print "\n"
# return our list of products
return products
def __init__(self, trainingData, attributes):
print "Training Bayesian Classifier with " + str(len(trainingData)) + " data entries.\n"
# COUNT VARIABLES
print "Counting all variables:"
if settings.PROGRESS_BAR == True:
util.updateProgress(0)
# Sort the training data into two bins based on classifier, meanwhile recording the counts for each variable
numOfEntries = float(len(trainingData))
categoricalCounts = {} # Holds counts of each category
self.classifierBins = {} # Holds the data points for each classifier
self.probability = {}
self.numericBins = {}
count = 0.0
for entry in trainingData: # for every data row...
count += 1.0
if settings.PROGRESS_BAR == True:
util.updateProgress(count / (numOfEntries))
for attr in entry: # for each attribute...
if util.isNumber(entry[attr]) == False: # for categorical attributes
if entry[attr] in categoricalCounts: # if we have already created a key for this
categoricalCounts[entry[attr]] += 1.0 # increment the key
else: # otherwise we create a new key and set it to 1
categoricalCounts[entry[attr]] = 1.0
if attr == settings.CLASSIFIER_NAME: # if we are on the classifier, in this case "class"
if entry[attr] in self.classifierBins: # add the row to the classifier bins,
self.classifierBins[entry[attr]].append(entry)
else:
self.classifierBins[entry[attr]] = [entry]
else: # For Numeric Attributes
key = attr + ' given ' + entry[settings.CLASSIFIER_NAME] # declare a key
if key in self.numericBins: # if the key is already in our numeric bins
bisect.insort(self.numericBins[key], entry[attr]) # insert the numeric attribute in a sorted location
else:
self.numericBins[key] = [entry[attr]] # if it doesn't exist, create a list for it
# DEAL WITH CONTINUOUS VARIABLES
initialKeys = self.numericBins.keys()
for key in initialKeys:
self.numericBins[key + " mean"] = np.mean(self.numericBins[key]) # store mean of each prob
self.numericBins[key + " stdev"] = np.std(self.numericBins[key]) # store std deviation of each continuous var
for attr in attributes: # if we have not stored values for certain attributes, we do so now, using smoothing techniques
if attr[1] != 'real':
for attrType in attr[1]:
if attrType not in self.probability:
self.probability[attrType] = .5 / numOfEntries
for name in self.classifierBins:
self.probability[attrType + " given " + name] = .5 / len(self.classifierBins[name])
# ASSIGN PROBABILITIES
print "\n\nAssigning probabilities:"
# Now we have two bins, each holding our different classifiers and counts of all our variables
if settings.PROGRESS_BAR == True:
util.updateProgress(0)
for key in categoricalCounts.keys(): # Assign categorical counts
self.probability[key] = self.getProbability(categoricalCounts[key], numOfEntries)
attrs = categoricalCounts.keys() # get the attrs we will iterate through
count = 0.0 # create a count used to log to the status bar
for key in self.classifierBins.keys(): # for each classifier type...
count += 1
if settings.PROGRESS_BAR == True:
util.updateProgress(count / float(len(self.classifierBins.keys()))) # update progress bar
for row in self.classifierBins[key]: # for each row in the classifierBins...
for rowKey in row: # for each key in the row...
if util.isNumber(row[rowKey]) == False: # if we're dealing with a categorical variable...
newKey = row[rowKey] + " given " + key # create a key variable
if newKey in categoricalCounts: # count number of items included in that section
categoricalCounts[newKey] += 1.0
else:
categoricalCounts[newKey] = 1.0
for attrValue in attrs: # for every attrValue...
countKey = attrValue + " given " + key # create a key
if countKey in categoricalCounts: # add to categoricalCounts our conditional probabilities
self.probability[countKey] = self.getProbability(categoricalCounts[countKey], len(self.classifierBins[key])) # Assign conditional probabilities
else:
self.probability[countKey] = self.getProbability(0, len(self.classifierBins[key]))
if settings.PROGRESS_BAR == True:
util.updateProgress(1)
print "\nModel creation complete\n"
def readArff(fileSrc):
# main variables to be returned
relation = "" # relation
attributes = [] # attribute list
rawData = [] # main data storage
reverseLookup = {} # store by value for reverse lookup
continuousVariables = {}
categoricalVariables = {}
dataFile = codecs.open(fileSrc, 'rb', 'utf-8') # specify utf-8 encoding
print "Reading file..."
lines = dataFile.readlines() # read all lines
if settings.PROGRESS_BAR == True:
util.updateProgress(0) # create a progress bar
# test every line and extract its relevant information
for idx, line in enumerate(lines): # test each line
if settings.PROGRESS_BAR == True:
util.updateProgress(float(idx) / float(len(lines)))
if line[0] == '%': # ignore comments
continue
elif line[0] == '@': # if is metadata
if '@relation' in line: # if relation
arrayLine = line.split(" ")
relation = arrayLine[1]
elif "@attribute" in line: # if attribute
arrayLine = line.split(" ")
attributes.append([arrayLine[1]])
if "real" not in arrayLine[2]: # if attribute is not real (is categorical)
attrs = re.search('\{(.*?)\}', line).group() # select text between brackets
attrs = re.sub('[\{\}]', "", attrs) # remove brackets
newAttrs = attrs.split(", ")
options = []
for attr in newAttrs:
options.append(attr)
attributes[len(attributes) - 1].append(options)
else: # if it is real
attributes[len(attributes) - 1].append('real')
elif line[0] == " ":
continue
else:
line = line.replace(" ", "")
line = line.replace("\n", "")
line = line.split(",")
newDataEntry = {} # create a new object to store our row data
for idx, value in enumerate(line): # for every column of data
attribute = attributes[idx]
if util.isNumber(value): # convert string to float if it's a number
value = float(value)
# Add value to our reverse lookup under the key "attributeName attributeValue"
rlKey = attribute[0] + " " + str(value) # create key for our reverseLookup data structure
if rlKey in reverseLookup:
reverseLookup[rlKey].append(len(rawData)) # append index of our current row (the length of data) for quick lookup later
else:
reverseLookup[rlKey] = [len(rawData)] # create a new arrayList to store our indices if one does not already exist
# fill our newData Entry
newDataEntry[attribute[0]] = value # store the value under its proper key
# add variables to our bins
if attribute[1] == 'real': # if the attribute is real, we place it in a continuous bin
if attribute[0] in continuousVariables:
continuousVariables[attribute[0]].add(value, line[len(line) - 1]) # add our value to our continuous bin
else:
continuousVariables[attribute[0]] = util.continuousBin(attribute[0]) # instantiate a continuous bin to hold our variable
continuousVariables[attribute[0]].add(value, line[len(line) - 1])
else: # if the attribute is categorical, we place it in a categorical bin
if attribute[0] in categoricalVariables:
categoricalVariables[attribute[0]].add(value, line[len(line) - 1])
else:
categoricalVariables[attribute[0]] = util.categoricalBin(attribute[1])
categoricalVariables[attribute[0]].add(value, line[len(line) - 1])
rawData.append(newDataEntry) # append data entry to all of our data
# END OF FOR LOOP
results = {}
results['data'] = rawData
results['attributes'] = attributes
results['relation'] = relation
results['lookup'] = reverseLookup
results['continuousVariables'] = continuousVariables
results['categoricalVariables'] = categoricalVariables
if settings.PROGRESS_BAR == True:
util.updateProgress(1)
print "\nFile read complete \n"
return results
def optimize (self, X, Y ):
""" Optimizes the number of trees (estimators) and max features used (features)
and returns the best values, acording to the OOB criteria
The results are shown in a diagnostic plot
To avoid including many trees to produce tiny improvements, increments of OOB error
below 0.01 are considered irrelevant
"""
RANDOM_STATE = 1226
errors = {}
features = ['sqrt','log2','none']
if self.quantitative:
tclf = {'sqrt': RandomForestRegressor(warm_start=False, oob_score=True,
max_features="sqrt",random_state=RANDOM_STATE),
'log2': RandomForestRegressor(warm_start=False, oob_score=True,
max_features="log2",random_state=RANDOM_STATE),
'none': RandomForestRegressor(warm_start=False, oob_score=True,
max_features=None ,random_state=RANDOM_STATE) }
else:
tclf = {'sqrt': RandomForestClassifier(warm_start=False, oob_score=True,
max_features="sqrt",random_state=RANDOM_STATE,
class_weight=self.class_weight),
'log2': RandomForestClassifier(warm_start=False, oob_score=True,
max_features="log2",random_state=RANDOM_STATE,
class_weight=self.class_weight),
'none': RandomForestClassifier(warm_start=False, oob_score=True,
max_features=None ,random_state=RANDOM_STATE,
class_weight=self.class_weight) }
# Range of `n_estimators` values to explore.
min_estimators = 15
max_estimators = 700
stp_estimators = 100
num_steps = int((max_estimators-min_estimators)/stp_estimators)
print 'optimizing RF....'
updateProgress (0.0)
optValue = 1.0e10
j = 0
for fi in features:
errors[fi] = []
count = 0
for i in range(min_estimators, max_estimators + 1,stp_estimators):
clf = tclf[fi]
clf.set_params(n_estimators=i)
clf.fit(X,Y)
oob_error = 1 - clf.oob_score_
errors[fi].append((i,oob_error))
if oob_error < optValue:
if np.abs(oob_error - optValue) > 0.01:
optValue = oob_error
optEstimators = i
optFeatures = fi
updateProgress (float(count+(j*num_steps))/float(len(features)*num_steps))
count = count+1
j=j+1
for ie in errors:
xs, ys = zip (*errors[ie])
plt.plot(xs, ys, label=ie)
plt.xlim(min_estimators, max_estimators)
plt.xlabel("n_estimators (Trees)")
plt.ylabel("OOB error rate")
plt.legend(loc="upper right")
plt.show()
plt.savefig(self.vpath+"/rf-OOB-parameter-tuning.png")
plt.savefig("./rf-OOB-parameter-tuning.png")
print 'optimum features:', optFeatures, 'optimum estimators:', optEstimators, 'best OOB:', optValue
return (optEstimators, optFeatures)
def varSelectionFFD (self, X, Y , A, autoscale=False, gui=True):
# TODO : set dummyStep and ratio as tunable parameters
dummyStep = 4.0
ratio = 2.0
# TODO : check the number of X variables. FFD is not suitable for very large X matrices
# build a X reduced matrix Xr
nobj, nvarx = np.shape (X)
nvarxOri = nvarx
index = np.ones(nvarx,dtype=np.int)
st = np.std (X, axis=0, ddof=1)
for i in range (nvarx):
if st[i] < 1e-10:
index[i] = 0 # set to 0 to allow creation of reduced matrices
nvarxb = np.sum(index)
#print index
Xb = np.empty((nobj, nvarxb), dtype=np.float64)
k=0
for i in range (nvarx):
if index[i]>0:
Xb[:,k]=X[:,i]
k+=1
nobj, nvarx = np.shape (Xb)
ndummy = int (np.floor(nvarx/dummyStep)) # number of dummy variables
nvarxm = nvarx + ndummy # length of expanded vector
ncomb, design = generateDesignFFD (nvarxm, ratio) # ncomb is the number of reduced models to be generated
# design is the matrix that designates is every x variable
# is in/out of the design matrix
# print nvarx, ndummy, nvarxm, ncomb
# obtain first estimation of Y std error
SSY0 = 0.0
for i in range (nobj):
SSY0+=np.square(Y[i]-np.mean(Y))
SDEP0 = np.sqrt(SSY0/float(nobj))
SDEP0x10 = 10.0 * SDEP0
# initializes effects
effect = np.zeros(nvarxm,dtype=np.float64)
xdesign = np.zeros(nvarx ,dtype=np.int)
# set common model stuff
self.autoscale = autoscale
self.Y = Y.copy()
if gui: updateProgress (0.0)
for i in range(ncomb):
# extract x design line (not considering dummies)
k=0
for j in range (nvarxm):
if j%(dummyStep+1) : # non-dummy var
xdesign[k]=design[i][j]
k+=1
nvarxr = int(np.sum(xdesign>0))
# if this design line contains few x vars skip the model validation
if nvarxr <= (A+1) : continue
# build a X reduced matrix Xr
Xr = np.empty((nobj, nvarxr), dtype=np.float64)
k=0
for j in range (nvarx):
if xdesign[j]>0:
Xr[:,k]=Xb[:,j]
k+=1
# set the reduced matrix as model matrix and validate
self.X = Xr.copy()
self.validateLOO (A)
# accumulate the min SDEP to a effect vector for every variable (including dummies)
minSDEP = 2.0e10
for a in self.SDEP:
if a < minSDEP : minSDEP = a
if minSDEP > SDEP0x10:
minSDEP = SDEP0
effect += design[i]*minSDEP
if gui: updateProgress (float(i)/float(ncomb))
# calculate effects
effect /= (ncomb/2)
# compute dummy effects
dummyEffect = 0.00
dummyMean = 0.00
k = 0
for i in range(nvarxm):
if not (i%(dummyStep+1)) : # dummy var
dummyMean+=effect[i]
dummyMean/=ndummy
for i in range(nvarxm):
if not (i%(dummyStep+1)) : # dummy var
dummyEffect+=np.square(effect[i]-dummyMean)
##dummyEffect+=np.square(effect[i]) ## old version: assuming mean of zero (?)
##td+=1
else :
effect[k]=effect[i]
k+=1
if dummyEffect > 1e-6:
dummySD = np.sqrt(dummyEffect/ndummy)
else :
dummySD = 0.001
# compare with critical T values (two tail, 95%)
t = stats.t.ppf(0.9725,ndummy-1)
effectCutoff = t * dummySD
res = np.ones(nvarx,dtype=np.int) # fixed (default)
for i in range(nvarx):
if np.abs(effect[i]) < effectCutoff: # uncertain
res[i] = 2
elif effect[i] > 0 :
res[i] = 0 # excluded
#print res
# map the result in a vector representing the full, original X
resExp = np.ones(nvarxOri,dtype=np.int)
k = 0
for i in range (nvarxOri):
if index[i]==0:
resExp[i] = 0 # these were already excluded or are inactive variables
else :
resExp[i] = res[k]
k += 1
return resExp, np.sum(res==0)
def validateLOO (self, A, gui=False):
""" Validates A dimensions of an already built PLS model, using Leave-One-Out cross-validation
Returns nothing. The results of the cv (SSY, SDEP and Q2) are stored internally
"""
if self.X == None or self.Y == None:
return
X = self.X
Y = self.Y
nobj,nvarx = np.shape (X)
SSY0 = 0.0
for i in range (nobj):
SSY0+=np.square(Y[i]-np.mean(Y))
SSY = np.zeros(A,dtype=np.float64)
YP = np.zeros ((nobj,A+1),dtype=np.float64)
if gui: updateProgress (0.0)
for i in range (nobj):
# build reduced X and Y matrices removing i object
Xr = np.delete(X,i,axis=0)
Yr = np.delete(Y,i)
Xr,muxr = center(Xr)
Xr,wgxr = scale (Xr, self.autoscale)
Yr,muyr = center(Yr)
xp = np.copy(X[i,:])
xp -= muxr
xp *= wgxr
# predicts y for the i object, using A LV
yp = self.getLOO(Xr,Yr,xp,A)
yp += muyr
# updates SSY with the object i errors
YP[i,0]=Y[i]
for a in range(A):
SSY[a]+= np.square(yp[a]-Y[i])
YP[i,a+1]=yp[a]
if gui : updateProgress (float(i)/float(nobj))
if gui : print
self.SSY = SSY
self.SDEP = [np.sqrt(i/nobj) for i in SSY]
self.Q2 = [1.00-(i/SSY0) for i in SSY]
self.Av = A
return (YP)
def readArff(fileSrc):
# main variables to be returned
relation = "" # relation
attributes = [] # attribute list
rawData = [] # main data storage
reverseLookup = {} # store by value for reverse lookup
continuousVariables = {}
categoricalVariables = {}
dataFile = codecs.open(fileSrc, 'rb', 'utf-8') # specify utf-8 encoding
print "Reading file..."
lines = dataFile.readlines() # read all lines
if settings.PROGRESS_BAR == True:
util.updateProgress(0) # create a progress bar
# test every line and extract its relevant information
for idx, line in enumerate(lines): # test each line
if settings.PROGRESS_BAR == True:
util.updateProgress(float(idx) / float(len(lines)))
if line[0] == '%': # ignore comments
continue
elif line[0] == '@': # if is metadata
if '@relation' in line: # if relation
arrayLine = line.split(" ")
relation = arrayLine[1]
elif "@attribute" in line: # if attribute
arrayLine = line.split(" ")
attributes.append([arrayLine[1]])
if "real" not in arrayLine[
2]: # if attribute is not real (is categorical)
attrs = re.search(
'\{(.*?)\}',
line).group() # select text between brackets
attrs = re.sub('[\{\}]', "", attrs) # remove brackets
newAttrs = attrs.split(", ")
options = []
for attr in newAttrs:
options.append(attr)
attributes[len(attributes) - 1].append(options)
else: # if it is real
attributes[len(attributes) - 1].append('real')
elif line[0] == " ":
continue
else:
line = line.replace(" ", "")
line = line.replace("\n", "")
line = line.split(",")
newDataEntry = {} # create a new object to store our row data
for idx, value in enumerate(line): # for every column of data
attribute = attributes[idx]
if util.isNumber(
value): # convert string to float if it's a number
value = float(value)
# Add value to our reverse lookup under the key "attributeName attributeValue"
rlKey = attribute[0] + " " + str(
value) # create key for our reverseLookup data structure
if rlKey in reverseLookup:
reverseLookup[rlKey].append(
len(rawData)
) # append index of our current row (the length of data) for quick lookup later
else:
reverseLookup[rlKey] = [
len(rawData)
] # create a new arrayList to store our indices if one does not already exist
# fill our newData Entry
newDataEntry[attribute[
0]] = value # store the value under its proper key
# add variables to our bins
if attribute[
1] == 'real': # if the attribute is real, we place it in a continuous bin
if attribute[0] in continuousVariables:
continuousVariables[attribute[0]].add(
value,
line[len(line) -
1]) # add our value to our continuous bin
else:
continuousVariables[attribute[0]] = util.continuousBin(
attribute[0]
) # instantiate a continuous bin to hold our variable
continuousVariables[attribute[0]].add(
value, line[len(line) - 1])
else: # if the attribute is categorical, we place it in a categorical bin
if attribute[0] in categoricalVariables:
categoricalVariables[attribute[0]].add(
value, line[len(line) - 1])
else:
categoricalVariables[
attribute[0]] = util.categoricalBin(attribute[1])
categoricalVariables[attribute[0]].add(
value, line[len(line) - 1])
rawData.append(
newDataEntry) # append data entry to all of our data
# END OF FOR LOOP
results = {}
results['data'] = rawData
results['attributes'] = attributes
results['relation'] = relation
results['lookup'] = reverseLookup
results['continuousVariables'] = continuousVariables
results['categoricalVariables'] = categoricalVariables
if settings.PROGRESS_BAR == True:
util.updateProgress(1)
print "\nFile read complete \n"
return results