Python DictionaryLearning.fit方法代码示例

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
def get_dic_per_cluster(clust_q, data_cluster, dataq, i, out_q=None, kerPCA=False):
    if out_q is not None:
        name = mpc.current_process().name
        print name, 'Starting'
    else:
        print 'Starting estimation of dic %i...' % i
    # parse the feature vectors for each cluster
    for q in clust_q:
        data_cluster = np.vstack((data_cluster, dataq[q]))
    # remove useless first line
    data_cluster = data_cluster[1:, :]
    # learn the sparse code for that cluster
    if kerPCA is False:
        dict_learn = DictionaryLearning(n_jobs=10)
        dict_learn.fit(data_cluster)
    else:
        print 'Doing kernel PCA...'
        print data_cluster.shape
        dict_learn = KernelPCA(kernel="rbf", gamma=10, n_components=3)
        #dict_learn = PCA(n_components=10)
        dict_learn.fit(data_cluster)
    if out_q is not None:
        res = {}
        res[i] = dict_learn
        out_q.put(res)
        print name, 'Exiting'
    else:
        print 'Finished.'
        return dict_learn   # dict(i = dict_learn)

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
def sparse_coding(dimension, input_x, alpha, iteration, tolerance):
	#dl = DictionaryLearning(dimension)
	dl = DictionaryLearning(dimension, alpha, iteration, tolerance) 
	dl.fit(input_x)
	#np.set_printoptions(precision=3, suppress=True)
	#print code
	#print dl.components_
	print "error:", dl.error_[-1]
	
	return dl

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
def test_dict_learning_lassocd_readonly_data():
    n_components = 12
    with TempMemmap(X) as X_read_only:
        dico = DictionaryLearning(n_components, transform_algorithm='lasso_cd',
                                  transform_alpha=0.001, random_state=0, n_jobs=-1)
        code = dico.fit(X_read_only).transform(X_read_only)
        assert_array_almost_equal(np.dot(code, dico.components_), X_read_only, decimal=2)

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
def test_dict_learning_split():
    n_atoms = 5
    dico = DictionaryLearning(n_atoms, transform_algorithm='threshold')
    code = dico.fit(X).transform(X)
    dico.split_sign = True
    split_code = dico.transform(X)

    assert_array_equal(split_code[:, :n_atoms] - split_code[:, n_atoms:], code)

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
def test_dict_learning_nonzero_coefs():
    n_components = 4
    dico = DictionaryLearning(n_components, transform_algorithm='lars',
                              transform_n_nonzero_coefs=3, random_state=0)
    code = dico.fit(X).transform(X[np.newaxis, 1])
    assert_true(len(np.flatnonzero(code)) == 3)

    dico.set_params(transform_algorithm='omp')
    code = dico.transform(X[np.newaxis, 1])
    assert_equal(len(np.flatnonzero(code)), 3)

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
def test_dict_learning_reconstruction():
    n_components = 12
    dico = DictionaryLearning(n_components, transform_algorithm='omp',
                              transform_alpha=0.001, random_state=0)
    code = dico.fit(X).transform(X)
    assert_array_almost_equal(np.dot(code, dico.components_), X)

    dico.set_params(transform_algorithm='lasso_lars')
    code = dico.transform(X)
    assert_array_almost_equal(np.dot(code, dico.components_), X, decimal=2)

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
def test_dict_learning_split():
    n_components = 5
    dico = DictionaryLearning(n_components, transform_algorithm='threshold',
                              random_state=0)
    code = dico.fit(X).transform(X)
    dico.split_sign = True
    split_code = dico.transform(X)

    assert_array_equal(split_code[:, :n_components] -
                       split_code[:, n_components:], code)

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
def trainLowDict(buffer):
    print('Learning the dictionary...')
    t0 = time()
    dico = DictionaryLearning(n_components=100, alpha=1, max_iter=100,verbose=1)

    V = dico.fit(buffer).components_
    E = dico.error_
    dt = time() - t0
    print('done in %.2fs.' % dt)
    return V,E

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
def test_dict_learning_reconstruction_parallel():
    # regression test that parallel reconstruction works with n_jobs=-1
    n_components = 12
    dico = DictionaryLearning(n_components, transform_algorithm='omp',
                              transform_alpha=0.001, random_state=0, n_jobs=-1)
    code = dico.fit(X).transform(X)
    assert_array_almost_equal(np.dot(code, dico.components_), X)

    dico.set_params(transform_algorithm='lasso_lars')
    code = dico.transform(X)
    assert_array_almost_equal(np.dot(code, dico.components_), X, decimal=2)

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
def create_dictionary_dl(lmbd, K=100, N=10000, dir_mnist='save_exp/mnist'):

    import os.path as osp
    fname = osp.join(dir_mnist, "D_mnist_K{}_lmbd{}.npy".format(K, lmbd))
    if osp.exists(fname):
        D = np.load(fname)
    else:
        from sklearn.decomposition import DictionaryLearning
        mnist = input_data.read_data_sets('MNIST_data', one_hot=True)
        im = mnist.train.next_batch(N)[0]
        im = im.reshape(N, 28, 28)
        im = [imresize(a, (17, 17), interp='bilinear', mode='L')-.5
              for a in im]
        X = np.array(im).reshape(N, -1)
        print(X.shape)

        dl = DictionaryLearning(K, alpha=lmbd*N, fit_algorithm='cd',
                                n_jobs=-1, verbose=1)
        dl.fit(X)
        D = dl.components_.reshape(K, -1)
        np.save(fname, D)
    return D

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
class SC(object):
    """
    Wrapper for sklearn package.  Performs sparse coding

    Sparse Coding, or Dictionary Learning has 5 methods:
       - fit(waveforms)
       update class instance with Sparse Coding fit

       - fit_transform()
       do what fit() does, but additionally return the projection onto new basis space

       - inverse_transform(A)
       inverses the decomposition, returns waveforms for an input A, using Z^\dagger

       - get_basis()
       returns the basis vectors Z^\dagger

       - get_params()
       returns metadata used for fits.
    """
    def __init__(self, num_components=10,
                 catalog_name='unknown',
                 alpha = 0.001,
                 transform_alpha = 0.01,
                 max_iter = 2000,
                 tol = 1e-9,
                 n_jobs = 1,
                 verbose = True,
                 random_state = None):

        self._decomposition   = 'Sparse Coding'
        self._num_components  = num_components
        self._catalog_name    = catalog_name
        self._alpha           = alpha
        self._transform_alpha = 0.001
        self._n_jobs          = n_jobs
        self._random_state    = random_state

        self._DL = DictionaryLearning(n_components=self._num_components,
                              alpha           = self._alpha,
                              transform_alpha = self._transform_alpha,
                              n_jobs          = self._n_jobs,
                              verbose         = verbose,
                              random_state    = self._random_state)

    def fit(self,waveforms):
        # TODO make sure there are more columns than rows (transpose if not)
        # normalize waveforms
        self._waveforms = waveforms
        self._DL.fit(self._waveforms)

    def fit_transform(self,waveforms):
        # TODO make sure there are more columns than rows (transpose if not)
        # normalize waveforms
        self._waveforms = waveforms
        self._A = self._DL.fit_transform(self._waveforms)
        return self._A

    def inverse_transform(self,A):
        # convert basis back to waveforms using fit
        new_waveforms = self._DL.inverse_transform(A)
        return new_waveforms

    def get_params(self):
        # TODO know what catalog was used! (include waveform metadata)
        params = self._DL.get_params()
        params['num_components'] = params.pop('n_components')
        params['Decompositon'] = self._decomposition
        return params

    def get_basis(self):
        """ Return the SPCA basis vectors (Z^\dagger)"""
        return self._DL.components_

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
	nmfHOG = NMF(n_components=components)
	nmfHOF = NMF(n_components=components)

	nmfHOG.fit(np.array([x['hog'] for x in features]).T)
	nmfHOF.fit(np.array([x['hof'] for x in features]).T)

	hogComponents = icaHOG.components_.T
	hofComponents = icaHOF.components_.T

	return hogComponents, hofComponents	

if 0:
	from sklearn.decomposition import DictionaryLearning
	dicHOG = DictionaryLearning(25)
	dicHOG.fit(hogs)


def displayComponents(components):
	
	sides = ceil(np.sqrt(len(components)))
	for i in range(len(components)):
		subplot(sides, sides, i+1)
		imshow(hog2image(components[i], imageSize=[24,24],orientations=4))

	sides = ceil(np.sqrt(components.shape[1]))
	for i in range(components.shape[1]):
		subplot(sides, sides, i+1)
		imshow(hog2image(components[:,i], imageSize=[24,24],orientations=4))

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
    if i + 1 < video.shape[2]:
        image = np.vstack(
            (image, np.abs((video[:, :, i].reshape((1, 75 * 50)) - video[:, :, i + 1].reshape((1, 75 * 50)))))
        )
idx = np.random.shuffle([i for i in xrange(image[1:].shape[0])])
image = image[idx][0]
image = (image - np.min(image, axis=0)) / (np.max(image, axis=0) + 0.01)
audio = audio.T[idx, :][0]
print image.shape, audio.shape
fusion = np.hstack((image, audio))
# sparse code
video_learner = DictionaryLearning(n_components=784, alpha=0.5, max_iter=50, fit_algorithm="cd", verbose=1)
audio_learner = DictionaryLearning(n_components=10, alpha=0.5, max_iter=50, fit_algorithm="cd", verbose=1)
fusion_learner = DictionaryLearning(n_components=784, alpha=0.5, max_iter=50, fit_algorithm="cd", verbose=1)

video_learner.fit(image)
"""
# build model
face_rbm = RBM(n_components=100, verbose=2, batch_size=20, n_iter=10)
audio_rbm = RBM(n_components=100, verbose=2, batch_size=20, n_iter=10)

# fit model

face_rbm.fit(image)
audio_rbm.fit(audio)
print face_rbm.components_.shape, audio_rbm.components_.shape

hidden = np.hstack((face_rbm.components_, audio_rbm.components_))
print hidden.shape

fusion_rbm = RBM(n_components=100,verbose=2, batch_size=20, n_iter=10)

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
class SparseCoding:

    DEFAULT_MODEL_PARAMS = {
        'n_components' : 10,
        'n_features' : 64,
        'max_iter' : 5,
        'random_state' : 1,
        'dict_init' : None,
        'code_init' : None
    }

    def __init__(self, model_filename=None):
        if model_filename is not None:
            self.load_model(model_filename)
        else:
            # default model params
            self.n_components = SparseCoding.DEFAULT_MODEL_PARAMS['n_components']
            self.n_features = SparseCoding.DEFAULT_MODEL_PARAMS['n_features']
            self.max_iter = SparseCoding.DEFAULT_MODEL_PARAMS['max_iter']
            self.random_state = SparseCoding.DEFAULT_MODEL_PARAMS['random_state']
            self.dict_init = SparseCoding.DEFAULT_MODEL_PARAMS['dict_init']
            self.code_init = SparseCoding.DEFAULT_MODEL_PARAMS['code_init']

            # initialize Dictionary Learning object with default params and weights
            self.DL_obj = DictionaryLearning(n_components=self.n_components,
                                       alpha=1,
                                       max_iter=self.max_iter,
                                       tol=1e-08,
                                       fit_algorithm='lars',
                                       transform_algorithm='omp',
                                       transform_n_nonzero_coefs=None,
                                       transform_alpha=None,
                                       n_jobs=1,
                                       code_init=self.code_init,
                                       dict_init=self.dict_init,
                                       verbose=False,
                                       split_sign=False,
                                       random_state=self.random_state)


    def save_model(self, filename):
        # save DL object to file, compress is also to prevent multiple model files.
        joblib.dump(self.DL_obj, filename, compress=3)


    def load_model(self, filename):
        # load DL Object from file
        self.DL_obj = joblib.load(filename)

        # set certain model params as class attributes. Get values from DL Obj.get_params() or use default values.
        DL_params = self.DL_obj.get_params()
        for param in SparseCoding.DEFAULT_MODEL_PARAMS:
            if param in DL_params:
                setattr(self, param, DL_params[param])
            else:
                setattr(self, param, SparseCoding.DEFAULT_MODEL_PARAMS[param])


    def learn_dictionary(self, whitened_patches):
        # assert correct dimensionality of input data
        if whitened_patches.ndim == 3:
            whitened_patches = whitened_patches.reshape((whitened_patches.shape[0], -1))
        assert whitened_patches.ndim == 2, "Whitened patches ndim is %d instead of 2" %whitened_patches.ndim

        # learn dictionary
        self.DL_obj.fit(whitened_patches)


    def get_dictionary(self):
        try:
            return self.DL_obj.components_
        except AttributeError:
            raise AttributeError("Feature extraction dictionary has not yet been learnt for this model. " \
                                 + "Train the feature extraction model at least once to prevent this error.")


    def get_sparse_features(self, whitened_patches):
        # assert correct dimensionality of input data
        if whitened_patches.ndim == 3:
            whitened_patches = whitened_patches.reshape((whitened_patches.shape[0], -1))
        assert whitened_patches.ndim == 2, "Whitened patches ndim is %d instead of 2" %whitened_patches.ndim
        try:
            sparse_code = self.DL_obj.transform(whitened_patches)
        except NotFittedError:
            raise NotFittedError("Feature extraction dictionary has not yet been learnt for this model, " \
                                 + "therefore Sparse Codes cannot be extracted. Train the feature extraction model " \
                                 + "at least once to prevent this error.")
        return sparse_code


    def get_sign_split_features(self, sparse_features):
        n_samples, n_components = sparse_features.shape
        sign_split_features = np.empty((n_samples, 2 * n_components))
        sign_split_features[:, :n_components] = np.maximum(sparse_features, 0)
        sign_split_features[:, n_components:] = -np.minimum(sparse_features, 0)
        return sign_split_features


    def get_pooled_features(self, input_feature_map, filter_size=(19,19)):
        # assuming square filters and images
#.........这里部分代码省略.........

# 需要导入模块: from sklearn.decomposition import DictionaryLearning [as 别名]
# 或者: from sklearn.decomposition.DictionaryLearning import fit [as 别名]
# sklearn utilities
from sklearn.decomposition import DictionaryLearning
from sklearn.preprocessing import normalize

def interface():
    args = argparse.ArgumentParser()
    # Required 
    args.add_argument('-i', '--data-matrix', help='Input data matrix', required=True)
    # Optional 
    args.add_argument('-d', '--dict-file', help='Dictionary encoder file (.pkl)', default='dict.pkl')
    args.add_argument('-n', '--num-atoms', help='Desired dictionary size', default=1000, type=int)
    args.add_argument('-a', '--alpha', help='Alpha (sparsity enforcement)', default=1.0, type=float)
    args = args.parse_args()
    return args

if __name__=="__main__":
    args = interface()

    # Load and preprocess the data
    sample_ids, matrix = parse_otu_matrix(args.data_matrix)
    matrix = normalize(matrix)

    # Learn a dictionary 
    dict_transformer = DictionaryLearning(n_components=args.num_atoms, alpha=args.alpha)
    dict_transformer.fit(matrix)

    # Save dictionary to file  
    save_object_to_file(dict_transformer, args.dict_file)