Python preprocessing.Normalizer类代码示例

def normalize_test():
    X=[1,2,3,4,5,2,6,8]
    from sklearn.preprocessing import Normalizer
    normalizer = Normalizer()
    X2 = normalizer.fit_transform(X)

    print X2

def kfold(agetext,k,model,nfeatures,check=False,k2 = None,max_df=0.9,min_df=3):
    out = []
    for i in range(k):
        print "iteration: "+str(i)
        agetext = shuffle(agetext)
        X = agetext["text"]
        X = X.tolist()
        label = agetext["agegroup"].tolist()
        vec = TfidfVectorizer(tokenizer = tokenize,token_pattern=r'(?u)\b\w\w+\b|^[_\W]+$',lowercase=False,max_features=nfeatures,max_df = max_df,min_df = min_df,use_idf=True,ngram_range=(1,2))
        docs = []
        for doc in X:
            docs.append(" ".join(doc))
        docs2 = [doc.replace("\t","").replace("\n","") for doc in docs]
        traindocs = docs2[:7999]
        X = vec.fit_transform(traindocs)
        testdocs = docs2[8000:9500]
        X_test = vec.transform(testdocs)
        tlabel = label[:7999]
        testl = label[8000:9500]
        if(check):
            lsa = TruncatedSVD(k2, algorithm = 'arpack')
            normalizer = Normalizer(copy=False)
            X = lsa.fit_transform(X)
            X = normalizer.fit_transform(X)
            X_test = lsa.transform(X_test)
            X_test = normalizer.transform(X_test)
        model.fit(X,tlabel)
        pred = model.predict(X_test)
        out.append(round(accuracy_score(testl, pred),2))
    print str(out)
    print np.mean(out)

class TfIdf(Feature):
    def __init__(self):
        self.kbest = None
        self.vect = None
        self.truncated = None
        self.normalizer = None

    def train(self, reviews, labels):
        self.vect = TfidfVectorizer(analyzer='word', ngram_range=(1, 2), stop_words='english')

        reviews_text = [' '.join(list(chain.from_iterable(review))) for review in reviews]
        tfidf_matrix = self.vect.fit_transform(reviews_text).toarray()

        self.truncated = TruncatedSVD(n_components=50)
        self.truncated.fit(tfidf_matrix, labels)

        trunc = self.truncated.transform(tfidf_matrix)
        self.normalizer = Normalizer()
        self.normalizer.fit(trunc)

        self.kbest = SelectKBest(f_classif, k=5)
        self.kbest.fit(self.normalizer.transform(trunc), labels)

    def score(self, data):
        reviews_text = ' '.join(list(chain.from_iterable(data)))
        tfidf_matrix = self.vect.transform([reviews_text]).toarray()

        trunc = self.truncated.transform(tfidf_matrix)

        return tuple(self.kbest.transform(self.normalizer.transform(trunc))[0, :])

def kfold(agetext,k,model,k2):
    import collections
    out = []
    for i in range(k):
        print "iteration: "+str(i)
        agetext = shuffle(agetext)
        datatb = agetext.iloc[:,1:]
        label = agetext["agegroup"].tolist()
        X_train, X_test, y_train, y_test = cross_validation.train_test_split(
            datatb, label, test_size=0.15, random_state=i*6)
        data = X_train.values
        counter = collections.Counter(y_train)
        print counter
        testdata = X_test.values
        lsa = TruncatedSVD(k2, algorithm = 'arpack')
        normalizer = Normalizer(copy=False)
        X = lsa.fit_transform(data)
        X = normalizer.fit_transform(X)
        X_test = lsa.transform(testdata)
        X_test = normalizer.transform(X_test)
        model.fit(X,y_train)
        pred = model.predict(X_test)
        counter = collections.Counter(y_test)
        print counter
        counter = collections.Counter(pred)
        print counter
        out.append(round(accuracy_score(y_test, pred),5))
    print str(out)
    print np.mean(out)

def preprocess(data, n_components, use_tf_idf=True):
    """
    Preproecess the data for clustering by running SVD and
    normalizing the results. This process is also known as
    LSA.

    arguments:
    data -- Dataset, if tf_idf is Truethe object must contain a
            tf_idf table alongside a raw frequencies dataframe.
    n_components -- int, the number of components to use for the SVD
                    a minimum of 100 is recommended.
    use_tf_idf -- bool, whether to use the tf-idf frequencies for the
                  preprocessing.

    returns:
    e -- float, a measure of variance explained by the SVD.
    X -- np.array, an array with the data reduced to n_components.
    """
    if use_tf_idf:
        d = data.tf_idf.as_matrix()
    else:
        d = data.df.as_matrix()
    svd = TruncatedSVD(n_components=n_components)
    X = svd.fit_transform(d)
    norm = Normalizer()

    # Record a measure of explained variance
    e = svd.explained_variance_ratio_.sum()*100
    return e, norm.fit_transform(d)

    def __init__(self, 
                 YTrain_file,
                 XTrain_file,
                 XTest_file,
                 output_path,
                 normalise,
                 C,
                 class_weight,
                 ):
        """
        Arguments:
      
        """
        self.YTrain = joblib.load(YTrain_file)
        XTrain = joblib.load(XTrain_file)
        self.XTrain = XTrain.reshape(np.size(XTrain, axis=0), -1)
       
        XTest = joblib.load(XTest_file)   
        self.XTest = XTest.reshape(np.size(XTest, axis=0), -1)

        self.output_path = output_path
    
        if normalise:
            normalizer = Normalizer(copy=False)
            normalizer.transform(self.XTrain)
            normalizer.transform(self.XTest)

        self.C = C
        if class_weight == 'none':
            class_weight = None
        self.class_weight = class_weight

 def getPcaFeatures(self, images, components, image_size):
     imageDataset = self.getImagesAsDataset(images, image_size)
     norm = Normalizer()
     imageDataset = norm.fit_transform(imageDataset)
     pca = PCA(n_components=components)
     imageDataset = pca.fit_transform(imageDataset)
     return pca, norm, imageDataset

def explore_k(svd_trans, k_range):
    '''
    Explores various values of k in KMeans

    Args:
        svd_trans: dense array with lsi transformed data
        k_range: the range of k-values to explore
    Returns:
        scores: list of intertia scores for each k value
    '''

    scores = []
    # spherical kmeans, so normalize
    normalizer = Normalizer()
    norm_data = normalizer.fit_transform(svd_trans)
    for k in np.arange:
        km = KMeans(n_clusters=k, init='k-means++', max_iter=100, n_init=1,
                    verbose=2)
        km.fit(norm_data)
        scores.append(-1*km.score(norm_data))
    plt.plot(k_range, scores)
    plt.xlabel('# of clusters')
    plt.ylabel('Inertia')
    sns.despine(offset=5, trim=True)
    return scores

    def _normalize(self, X, y, X_t):
        from sklearn.preprocessing import Normalizer
        NORM = Normalizer()

        X = NORM.fit_transform(X, y)
        X_t = NORM.transform(X_t)

        return X, X_t

def kmeans(tfidf, svd, svd_trans, k=200, n_words=10):
    '''
    Performs k-means clustering on svd transformed data and plots it

    Args:
        tfidf: sklearn fitted TfidfVectorizer
        svd: sklearn fitted TruncatedSVD
        svd_trans: dense array with lsi transformed data
        k: the k in k-means
    Returns:
        km: the fitted KMean object
    '''

    # spherical kmeans, so normalize
    normalizer = Normalizer()
    norm_data = normalizer.fit_transform(svd_trans)
    km = KMeans(n_clusters=k, init='k-means++', max_iter=100, n_init=5,
                verbose=2)
    km.fit(norm_data)

    original_space_centroids = svd.inverse_transform(km.cluster_centers_)
    order_centroids = original_space_centroids.argsort()[:, ::-1]

    terms = tfidf.get_feature_names()
    terms = prettify(terms)
    terms = np.array(terms)
    fig = plt.figure(figsize=(10, 8))
    for i in range(10):
        print("Cluster {:d}:".format(i))
        for ind in order_centroids[i, :n_words]:
            print(' {:s}'.format(terms[ind]))
        print('\n')

        # Make a figure and axes with dimensions as desired.
        ax = fig.add_subplot(2, 5, i+1)
        ax.set_title('Cluster {:d}'.format(i+1))

        component = order_centroids[i]
        cmap = plt.cm.Purples
        mn = np.min(component[:n_words])
        mx = np.max(component[:n_words])
        norm = mpl.colors.Normalize(mn, mx)

        cb = mpl.colorbar.ColorbarBase(ax, cmap=cmap, norm=norm,
                                       orientation='vertical')
        # sorted_component = np.sort(component)
        colors = sns.color_palette('Purples', 9).as_hex()
        colors = np.repeat(colors[-1], n_words)

        cb.set_ticks(np.linspace(mn, mx, n_words+2)[1:-1])
        cb.ax.yaxis.set_tick_params(size=0)
        cb.ax.tick_params(labelsize=10)
        for color, tick in zip(colors, cb.ax.get_yticklabels()):
            tick.set_color(color)
            tick.set_fontsize(14)
        cb.set_ticklabels(np.array(terms)[order_centroids[i, :n_words][::-1]])
    plt.tight_layout()
    return km

def readAndPreProcess():
	print("\n\n********** CS-412 HW5 Mini Project **********")
	print("************ Submitted by Sankul ************\n\n")
	print("Reading data, please ensure that the dataset is in same folder.")
	resp = pd.read_csv('responses.csv')
	print("Data reading complete!")
	print("Some stats reagarding data:")
	resp.describe()
	
	print("\nStarting pre-processing.....")
	
	print("\nFinding missing values:")
	print("Missing values found, removing them")
	emptyVals = resp.isnull().sum().sort_values(ascending=False)
	emptyPlot = emptyVals.plot(kind='barh', figsize = (20,35))
	plt.show()
	print("Empty values removed")
	
	print("\nChecking for NaN and infinite values in target column (Empathy):")
	if len(resp['Empathy']) - len(resp[np.isfinite(resp['Empathy'])]):
		print("Number of infinite or NaN values in Empathy column: ", len(resp['Empathy']) - len(resp[np.isfinite(resp['Empathy'])]))
		print("Removing them")
		resp = resp[np.isfinite(resp['Empathy'])]
		print("Infinite and NaN values removed")
		
	print("\nChecking for categorical features:")
	if pd.Categorical(resp).dtype.name == 'category':
		print("Categorical features found. Removing them...")
		resp = resp.select_dtypes(exclude=[object])	
		print("Categorical features removed")
		
	print("\nReplacing NaN values with the mean value:")
	resp=resp.fillna(resp.mean()) 
	resp.isnull().sum()
	print("Values replaced")
	
	print("\nSeperating labels from data:")
	Y = resp['Empathy'].values
	X = resp.drop('Empathy',axis=1)
	print("Labels seperated")
	
	print("\nScaling, standardizing and normalizing the data:")
	scaler = MinMaxScaler(feature_range=(0, 1))
	rescaledX = scaler.fit_transform(X)
	
	scaler = StandardScaler().fit(rescaledX)
	standardizedX = scaler.transform(rescaledX)
	
	normalizer = Normalizer().fit(standardizedX)
	normalizedX = normalizer.transform(standardizedX)
	print("Scaling, standardizing and normalizing completed")
	
	print("\nFinal data looks like:")
	print(normalizedX.shape)
	print("Values inside look like:")
	print(normalizedX[0])
	
	return normalizedX,Y

 def __init__(self, img_dir):
     self._imgdir = img_dir
     self._extractors = self.__get_extractors()
     self._normalizer = Normalizer()
     self._face_normalizer = Normalizer()
     self._estimator = NearestNeighbors(n_neighbors=3)
     self._face_estimator = NearestNeighbors(n_neighbors=3)
     self._imgnames = []
     self._face_imgnames = []

class ScikitNormalizer(object):
    def __init__(self):
        self.data_normalizer = Normalizer()

    def fit(self, data):
        self.data_normalizer.fit(data)

    def transform(self, data):
        return (self.data_normalizer.transform(data) + 1) / 2

    def test_ver2_syntetic_dataset(self):

        self.ex = experiment.Experiment()
        self.ex.cf_matrix = load_sparse_data('syntetic_cf.dat')
        n = Normalizer(norm='l2', copy=True)
        self.ex.cf_matrix = n.transform(self.ex.cf_matrix) #normalized.
        self.ex.cb_prox = experiment.Experiment.load_data(PKL + 'cb_prox.pkl')
        self.ex.cf_prox = self.ex.cf_matrix * self.ex.cf_matrix.T
        self.ex.test_corr_sparsity(draw=True, interval=100)

    def reduce_dimension(self, n_components=2):
        """ Return PCA transform of self.data, with n_components. """

        reducer = PCA(n_components=n_components)

        X = self.data.values

        norm = Normalizer()
        Xnorm = norm.fit_transform(X)

        return reducer.fit_transform(Xnorm)