def combineClsDocs(rootDir):
#get class names in mini_newsgroup folder
clsList = getClsNames(rootDir)
#get all the directory names with absolute path
dirList = []
for parent, dirNames, fileNames in os.walk(rootDir):
for dirName in dirNames:
dirList.append(os.path.join(parent, dirName))
dirList.sort() #sort alphabetically
clsWordDict = {} #(class name : class words list) 20 pairs
for i in range(len(clsList)): #20 classes
#get all the file names in a class, store them into fileList
fileList = [] # file names with absolute path of a class
for parent, dirNames, fileNames in os.walk(dirList[i]):
for fileName in fileNames:
fileList.append(os.path.join(parent, fileName))
#combine the files of a class into clsWordsList, each file pre-processed
trainSize = int(len(fileList)*0.8) #80% of the documents for training
clsWordsList = []
for j in range(trainSize):
clsWordsList += getDocWordsList(fileList[j], stopWordFileName)
#construct className:classWordsList dictionary
#clsList[i] refers to the i-th class name
#clsWordsList refers to the class words list respectively
clsWordDict[ clsList[i] ] = clsWordsList
return clsWordDict
def getVocabulary(rootDir):
#get all the file names (absolute path with names)
fileList = []
for parent, dirNames, fileNames in os.walk(rootDir):
for fileName in fileNames:
fileList.append(os.path.join(parent, fileName))
#spare file by file to get the vovabulary
tempVocab = []
for eachfile in fileList:
#get a file's word list, pre-process is done.
wordsList = getDocWordsList(eachfile, stopWordFileName)
#add this file's words into vocabulary, combination(extend)
tempVocab += wordsList
tempVocab.sort()
## #delete the words whose count is less than 3
## #very time-consuming!!!
## #tempVocab = [word for word in tempVocab if tempVocab.count(word) >= 3]
## tempVocab = filter(lambda word: tempVocab.count(word) >= 3, tempVocab)
##
## #convert the vocabulary list to vocabulary set, remove reduplicative words
## #and remain only one.
## #the words in vocabulary is unique and sorted alphabetically(alphabetic order).
## VocabSet = set(tempVocab) #first convert to set
##
## Vocabulary = []
## Vocabulary = list(VocabSet) #convert back to list
## Vocabulary.sort()
#delete the words whose count is less than 3, Another Method!
vocabCountDict = {} #store word count for each word in tempVocab
for word in tempVocab:
if not vocabCountDict.has_key(word):
vocabCountDict[word] = 1 # not in dict, add it into it
else:
vocabCountDict[word] += 1 #already in dict, count++
for word,count in vocabCountDict.items():
if (count < 3):
del vocabCountDict[word] #delete word whose count < 3
Vocabulary = vocabCountDict.keys() #final vocabulary
#store the vocabulary into a file, to avoid repetitive function call
vocabFile = "vocabulary.data"
f = file(vocabFile, 'w')
p.dump(Vocabulary, f) #dump the object into a file
f.close()
#vocabulary size is 12942 (remove words whose count<3), in mini_newsgroups
#without removing low frequency words, vocab size will be about 30,000
return Vocabulary
def getTextFeature(docName, vocabulary):
#get text words firt
textWordsList = []
textWordsList = getDocWordsList(docName, stopWordFileName)
textWordsList.sort()
#calc text feature in terms of Vocabulary
textFeatureList = []
for eachWord in vocabulary:
textFeatureList.append(textWordsList.count(eachWord))
#textFeatureVector = np.array(textFeatureList) #convet list to array
#return textFeatureVector #len = sizeof(Vocabulary)
return textFeatureList