def fast_ica(image, components):
"""Reconstruct an image from Fast ICA compression using specific number of components to use
Args:
image: PIL Image, Numpy array or path of 3D image
components: Number of components used for reconstruction
Returns:
Reconstructed image
Example:
>>> from PIL import Image
>>> import numpy as np
>>> from ipfml.processing import reconstruction
>>> image_values = Image.open('./images/test_img.png')
>>> reconstructed_image = reconstruction.fast_ica(image_values, 25)
>>> reconstructed_image.shape
(200, 200)
"""
lab_img = transform.get_LAB_L(image)
lab_img = np.array(lab_img, 'uint8')
ica = FastICA(n_components=50)
# run ICA on image
ica.fit(lab_img)
# reconstruct image with independent components
image_ica = ica.fit_transform(lab_img)
restored_image = ica.inverse_transform(image_ica)
return restored_image
def test_inverse_transform():
# Test FastICA.inverse_transform
n_features = 10
n_samples = 100
n1, n2 = 5, 10
rng = np.random.RandomState(0)
X = rng.random_sample((n_samples, n_features))
expected = {(True, n1): (n_features, n1),
(True, n2): (n_features, n2),
(False, n1): (n_features, n2),
(False, n2): (n_features, n2)}
for whiten in [True, False]:
for n_components in [n1, n2]:
n_components_ = (n_components if n_components is not None else
X.shape[1])
ica = FastICA(n_components=n_components, random_state=rng,
whiten=whiten)
with warnings.catch_warnings(record=True):
# catch "n_components ignored" warning
Xt = ica.fit_transform(X)
expected_shape = expected[(whiten, n_components_)]
assert_equal(ica.mixing_.shape, expected_shape)
X2 = ica.inverse_transform(Xt)
assert_equal(X.shape, X2.shape)
# reversibility test in non-reduction case
if n_components == X.shape[1]:
assert_array_almost_equal(X, X2)
def ICASingleTrial(X):
"""
OD-ICA 单个trial样本数据 去眼电
输入参数
----------
X : T 采样点 x N 通道数
返回值
----------
reconSetZero: T 采样点 x N 通道数
"""
# pca = PCA()
pca_w = PCA(whiten=True)
ica = FastICA()
# fit_transform
# X: array - like, shape(n_samples, n_features)
# returns: array-like, shape (n_samples, n_components)
# PCAsig = pca.fit_transform(X)
PCAsig_W = pca_w.fit_transform(X)
ICAsig = ica.fit_transform(PCAsig_W)
setZero = np.zeros(ICAsig.shape)
for i in range(ICAsig.shape[1]):
isOutlier = ADJBP(ICAsig[:,i])
vector = ICAsig[:,i] # 取矩阵的列
vector[isOutlier] = 0
setZero[:,i] = vector
reconSetZero = pca_w.inverse_transform(ica.inverse_transform(setZero))
return reconSetZero
def test_inverse_transform():
"""Test FastICA.inverse_transform"""
rng = np.random.RandomState(0)
X = rng.random_sample((100, 10))
rng = np.random.RandomState(0)
X = rng.random_sample((100, 10))
n_features = X.shape[1]
expected = {(True, 5): (n_features, 5),
(True, 10): (n_features, 10),
(False, 5): (n_features, 10),
(False, 10): (n_features, 10)}
for whiten in [True, False]:
for n_components in [5, 10]:
ica = FastICA(n_components=n_components, random_state=rng,
whiten=whiten)
Xt = ica.fit_transform(X)
expected_shape = expected[(whiten, n_components)]
assert_equal(ica.mixing_.shape, expected_shape)
X2 = ica.inverse_transform(Xt)
assert_equal(X.shape, X2.shape)
# reversibility test in non-reduction case
if n_components == X.shape[1]:
assert_array_almost_equal(X, X2)
def _ica(self, batch, num_comps=4):
ica = FastICA(n_components=batch.shape[1], max_iter=300)
comps = ica.fit_transform(batch)
m = (-np.abs(comps)).min(axis=0)
selected = np.argsort(m)[:num_comps]
comps[:, selected] = 0
return ica.inverse_transform(comps)
def PerformIca(X,Y,num_components,random_state):
result = {}
algo = FastICA(random_state=random_state,max_iter=800)
algo.fit(X)
full_mixing_matrix = algo.mixing_
full_unmixing_matrix = algo.components_
_x = algo.transform(X)
kt_value = np.abs(kt(_x))
largest_kt_values_idx = np.argsort(kt_value)[::-1]
result["ica_kt_all"] = kt_value
for n in num_components:
prefix = "ica_" + str(n) + "_"
component_idx_to_select = largest_kt_values_idx[0:n]
mixing_matrix = full_mixing_matrix.T[component_idx_to_select,:].T
unmixing_matrix = full_unmixing_matrix[component_idx_to_select,:]
algo.components_ = unmixing_matrix
algo.mixing_ = mixing_matrix
result[prefix+"mm"] = mixing_matrix
result[prefix+"umm"] = unmixing_matrix
_x = algo.transform(X)
result[prefix+"data"] = _x
X_recons = algo.inverse_transform(_x)
result[prefix+"reconstruction_error"] = ComputeReconstructionSSE(X,X_recons)
n_kt_value = kt_value[component_idx_to_select]
avg_kt = n_kt_value.mean()
#print("ICA num dim {0} : reconstruction error {1} avg kt {2}".format(str(n),str(result[prefix+"reconstruction_error"]),str(avg_kt)))
#print(np.sort(n_kt_value))
return result
def test_inverse_transform(whiten, n_components, expected_mixing_shape,
global_random_seed, global_dtype):
# Test FastICA.inverse_transform
n_samples = 100
rng = np.random.RandomState(global_random_seed)
X = rng.random_sample((n_samples, 10)).astype(global_dtype)
ica = FastICA(n_components=n_components, random_state=rng, whiten=whiten)
with warnings.catch_warnings():
# For some dataset (depending on the value of global_dtype) the model
# can fail to converge but this should not impact the definition of
# a valid inverse transform.
warnings.simplefilter("ignore", ConvergenceWarning)
Xt = ica.fit_transform(X)
assert ica.mixing_.shape == expected_mixing_shape
X2 = ica.inverse_transform(Xt)
assert X.shape == X2.shape
# reversibility test in non-reduction case
if n_components == X.shape[1]:
# XXX: we have to set atol for this test to pass for all seeds when
# fitting with float32 data. Is this revealing a bug?
if global_dtype:
# XXX: dividing by a smaller number makes
# tests fail for some seeds.
atol = np.abs(X2).mean() / 1e5
else:
atol = 0.0 # the default rtol is enough for float64 data
assert_allclose(X, X2, atol=atol)
def ica_experiment(X, name, dims, max_iter=5000, tol=1e-04):
"""Run ICA on specified dataset and saves mean kurtosis results as CSV
file.
Args:
X (Numpy.Array): Attributes.
name (str): Dataset name.
dims (list(int)): List of component number values.
"""
ica = FastICA(random_state=0, max_iter=max_iter, tol=tol)
kurt = []
loss = []
X = StandardScaler().fit_transform(X)
for dim in dims:
print(dim)
ica.set_params(n_components=dim)
tmp = ica.fit_transform(X)
df = pd.DataFrame(tmp)
df = df.kurt(axis=0)
kurt.append(kurtosistest(tmp).statistic.mean())
proj = ica.inverse_transform(tmp)
loss.append(((X - proj)**2).mean())
res = pd.DataFrame({"kurtosis": kurt, "loss": loss})
# save results as CSV
resdir = 'results/ICA'
resfile = get_abspath('{}_kurtosis.csv'.format(name), resdir)
res.to_csv(resfile, index_label='n')
def reconstruction_error(X):
pca = PCA(n_components=0.95, svd_solver='full')
X_pca = pca.fit_transform(X)
X_pca_proj = pca.inverse_transform(X_pca)
print(pca.n_components_)
pca_mse = calc_mse(X, X_pca_proj)
print("Recontruction error for PCA : ", pca_mse)
ica = FastICA(n_components=17, tol=0.0001)
X_ica = ica.fit_transform(X)
X_ica_proj = ica.inverse_transform(X_ica)
ica_mse = calc_mse(X, X_ica_proj)
print("Recontruction error for ICA : ", ica_mse)
# rp = GaussianRandomProjection(n_components=16)
# X_rp = rp.fit_transform(X)
# X_rp_proj = np.matmul(X_rp, rp.components_)
# rp_mse = calc_mse(X, X_rp_proj)
#
# print("Recontruction error for RP : ", rp_mse)
tsvd = TruncatedSVD(n_components=16)
X_tsvd = tsvd.fit_transform(X)
X_tsvd_proj = tsvd.inverse_transform(X_tsvd)
tsvd_mse = calc_mse(X, X_tsvd_proj)
print("Recontruction error for TSVD : ", tsvd_mse)
def test_inverse_transform():
# Test FastICA.inverse_transform
n_features = 10
n_samples = 100
n1, n2 = 5, 10
rng = np.random.RandomState(0)
X = rng.random_sample((n_samples, n_features))
expected = {
(True, n1): (n_features, n1),
(True, n2): (n_features, n2),
(False, n1): (n_features, n2),
(False, n2): (n_features, n2)
}
for whiten in [True, False]:
for n_components in [n1, n2]:
n_components_ = (n_components
if n_components is not None else X.shape[1])
ica = FastICA(n_components=n_components,
random_state=rng,
whiten=whiten)
with warnings.catch_warnings(record=True):
# catch "n_components ignored" warning
Xt = ica.fit_transform(X)
expected_shape = expected[(whiten, n_components_)]
assert ica.mixing_.shape == expected_shape
X2 = ica.inverse_transform(Xt)
assert X.shape == X2.shape
# reversibility test in non-reduction case
if n_components == X.shape[1]:
assert_array_almost_equal(X, X2)
class ICA(method.Method): def __init__(self, params): self.params = params self.ica = FastICA(**params) def __str__(self): return "FastICA" def train(self, data): """ Train the FastICA on the withened data :param data: whitened data, ready to use """ self.ica.fit(data) def encode(self, data): """ Encodes the ready to use data :returns: encoded data with dimension n_components """ return self.ica.transform(data) def decode(self, components): """ Decode the data to return whitened reconstructed data :returns: reconstructed data """ return self.ica.inverse_transform(components)
def remove_blinks(x, fs=500 / 3):
ica = FastICA(tol=0.1, max_iter=500).fit(x)
x_ica = ica.transform(x) # applies unmixing matrix to x
win_length = 200
for i, col in enumerate(x_ica.T): # iterate columns
num_blinks = 0
for j in range(0, len(col) - win_length, win_length):
window = col[j:j + win_length] # window through signal
is_blink = detect_blink_peak(window) # detect blink in window
# count number of blinks
if is_blink:
num_blinks += 1
# compute kurtosis of whole signal
kur = kurtosis(col)
# compute hjorth complexity
comp = hjorth_complexity(col)[0][0]
# blink artifact source decision rule
if num_blinks >= len(x_ica) / (fs * 40) and kur > 5 and comp > 3:
x_ica[:, i] = 0
# apply inverse transformation
x_clean = ica.inverse_transform(x_ica)
return x_clean
def ICA(input_data_folder, experiment):
path_input_images = f"{input_data_folder}/{experiment}/images/"
try:
os.mkdir(f'{input_data_folder}/{experiment}/ICAimages/')
except FileExistsError:
pass
path_output = f"{input_data_folder}/{experiment}/ICAimages"
images = images_list(path_input_images)
for img, image_nb in tqdm(zip(images, range(len(images)))):
# image = images[0]
image = io.imread(f"{path_input_images}/{img}", as_gray=True)
ica = FastICA(n_components=20)
# whiten=True,
# max_iter = 2000,
# tol = 0.01)
image_ica = ica.fit_transform(image)
image_restored = ica.inverse_transform(image_ica)
# image_restored = image_restored.astype(np.uint8)
# show image to screen
# io.imshow(image_ica)
io.imsave(f'{path_output}/image{image_nb}.png', image_ica)
def solve_ica2(A, B, p=3, q=None):
"""Solve AX=B with ICA
"""
ica = FastICA(n_components=p)
ica.fit(A)
Ap = ica.inverse_transform(ica.transform(A))
if q:
ica = FastICA(n_components=q)
Bq = ica.inverse_transform(ica.transform(B))
Y = LA.lstsq(Ap, Bq, rcond=None)[0]
X = Y @ Wh[:q,:]
else:
Y = LA.lstsq(W, B, rcond=None)[0]
X = Y
return X, ''
def ICA_decomposition(data,keepVar=0.95):
ica=FastICA(whiten = True, max_iter = 300, tol = 0.0001)
demixed=ica.fit_transform(data)
M=ica.mixing_
var_scores=ordered_ICAcomps(data, M, demixed)
varSum=0
n_comp=0
for value in var_scores[:,0]:
varSum = varSum + value
n_comp = n_comp + 1
if varSum >= keepVar:
break
selected_comps=var_scores[:n_comp,1]
return ica, selected_comps
remix=ica.inverse_transform(demixed)
varSum = 0
for nc in range(0,data.shape[1]):
varSum = varSum + explained_variance_score(data,data-demixed[:,nc])
n_comp = n_comp + 1
if varSum >= keepVar:
break
return ica, n_comp
def perform_ica(features, datasetLabel, components):
print('ica start for ', datasetLabel)
transformer = FastICA(max_iter=550, random_state=0, whiten=True)
X_transformed = transformer.fit_transform(features)
print(X_transformed.shape)
unmodified_kurtosis = kurtosis(features)
print('Unmodified_kurtosis ', unmodified_kurtosis)
X_transformed = pd.DataFrame(X_transformed)
feature_kurtosis = X_transformed.kurt(axis=0)
print('Modified_kurtosis ', feature_kurtosis)
recon_error = []
# validate RMSE for reconstruction
for component in components:
transformer = FastICA(max_iter=550,
random_state=20,
whiten=True,
n_components=component)
X_transformed = transformer.fit_transform(features)
X_recon = transformer.inverse_transform(X_transformed)
rmse = sqrt(mean_squared_error(features, X_recon))
recon_error.append(rmse)
print('recon_error => ', recon_error)
plt.style.use("seaborn")
plt.plot(components, recon_error, marker='o')
plt.xticks(components, rotation="90")
plt.xlabel("ICA Components")
plt.ylabel('Reconstruction error')
plt.savefig('plots/dr/ica/' + datasetLabel + '/ica_recon_error.png')
plt.clf()
def ica_dim_red(x_train_scaled, dataset_name, features_num = 12):
ica = FastICA(random_state=random_state)
temp = ica.fit_transform(x_train_scaled)
order = [-abs(kurtosis(temp[:,i])) for i in range(temp.shape[1])]
temp = temp[:,np.array(order).argsort()]
ica_res = pd.Series([abs(kurtosis(temp[:,i])) for i in range(temp.shape[1])]);
l = plt.bar(list(range(len(ica_res))),ica_res, log = True)
plt.title("ICA Feature Kurtosis ("+str(dataset_name)+")")
plt.ylabel("Kurtosis")
plt.xlabel("Features (ordered by kurtosis)")
plt.savefig((str(dataset_name))+' ica analysis.png')
plt.show()
# print(temp)
print("List of of features with kurtosis <= 3")
print(np.where(np.log10(ica_res) <= 0.5)[0])
ica = FastICA(n_components=features_num, random_state=random_state)
ica_result = ica.fit_transform(x_train_scaled)
print(ica_result.shape)
x_projected_ica = ica.inverse_transform(ica_result)
print(x_projected.shape)
print(x_train_scaled.shape)
loss = ((x_train_scaled - x_projected_ica) ** 2).mean()
print(loss)
return ica_result,x_projected_ica
def ica_filter(field, nmodes, return_filter=False, **kwargs_ica):
"""
Apply an Independent Component Analysis (ICA) filter to a field. This
subtracts off functions in the frequency direction that correspond to the
highest SNR *statistically independent* modes of the empirical
frequency-frequency covariance.
Uses `sklearn.decomposition.FastICA`. For more details, see:
https://scikit-learn.org/stable/modules/generated/sklearn.decomposition.FastICA.html
Parameters:
field (array_like):
3D array containing the field that the filter will be applied to.
NOTE: This assumes that the 3rd axis of the array is frequency.
nmodes (int):
Number of eigenmodes to filter out.
return_filter (bool, optional):
Whether to also return the linear FG filter operator and coefficients.
**kwargs_ica (dict, optional):
Keyword arguments for the `sklearn.decomposition.FastICA`
Returns:
cleaned_field (array_like), transformer (sklearn.decomposition.FastICA instance, optional): Foreground-filtered field and ICA filter object.
- ``cleaned_field (array_like)``:
Foreground-cleaned field.
- ``transformer (sklearn.decomposition.FastICA instance, optional)``:
Contains the ICA filter. Only returned if `return_operator = True`.
To get the foreground model, you can do the following:
```
x = field - mean_field # shape (Npix, Nfreq)
x_trans = transformer.fit_transform(x.T) # mode amplitudes per pixel
x_fg = transformer.inverse_transform(x_trans).T # foreground model
```
"""
# Subtract mean vs. frequency
x = mean_spectrum_filter(field).reshape((-1, field.shape[-1])).T
# Build ICA model and get amplitudes for each mode per pixel
transformer = FastICA(n_components=nmodes, **kwargs_ica)
x_trans = transformer.fit_transform(x.T)
# Construct foreground operator
x_fg = transformer.inverse_transform(x_trans).T
# Subtract foreground operator
x_clean = (x - x_fg).T.reshape(field.shape)
# Return FG-subtracted data (and, optionally, the ICA filter instance)
if return_filter:
return x_clean, transformer
else:
return x_clean
def dump_data(data_path, task, reduce_sizes, trials=10):
X, y, _, _ = load_data(data_path, is_shuffle=True, is_split=False)
pca_components = reduce_sizes[0]
pca = PCA(n_components=pca_components, random_state=10)
X_PCA = pca.fit_transform(X)
X_reconstructed = pca.inverse_transform(X_PCA)
print("Reconstruction Error for PCA: %.6f" % np.mean(
(X - X_reconstructed)**2))
data = np.hstack((X_PCA, np.array([y]).T))
PCA_path = create_path('data', task, filename='PCA.csv')
np.savetxt(PCA_path, data, delimiter=",")
ica_components = reduce_sizes[1]
ica = FastICA(n_components=ica_components, random_state=10)
X_ICA = ica.fit_transform(X)
X_reconstructed = ica.inverse_transform(X_ICA)
print("Reconstruction Error for ICA: %.6f" % np.mean(
(X - X_reconstructed)**2))
data = np.hstack((X_ICA, np.array([y]).T))
ICA_path = create_path('data', task, filename='ICA.csv')
np.savetxt(ICA_path, data, delimiter=",")
rp_components = reduce_sizes[2]
re_list = []
min_re_error = float("inf")
X_RP = None
for i in range(trials):
rp = GaussianRandomProjection(n_components=rp_components)
rp.fit(X)
X_transformed = rp.transform(X)
c_square = np.dot(rp.components_.T, rp.components_)
X_reconstructed = np.dot(X_transformed, rp.components_)
error = np.mean((X - X_reconstructed)**2)
if error < min_re_error:
min_re_error = error
X_RP = X_transformed
re_list.append(error)
print(np.mean(re_list))
print(np.std(re_list))
print("Reconstruction Error for RP: %.6f" % min_re_error)
data = np.hstack((X_RP, np.array([y]).T))
RP_path = create_path('data', task, filename='RP.csv')
np.savetxt(RP_path, data, delimiter=",")
mi_components = reduce_sizes[3]
X_MI = SelectKBest(mutual_info_classif,
k=mi_components).fit_transform(X, y)
data = np.hstack((X_MI, np.array([y]).T))
MI_path = create_path('data', task, filename='MI.csv')
np.savetxt(MI_path, data, delimiter=",")
def main():
# features = ['age', 'workclass', 'fnlwgt', 'education', 'education-num', 'marital-status', 'occupation',
# 'relationship', 'race', 'sex', 'capital-gain', 'capital-loss', 'hours-per-week',
# 'native-country', '<=50k']
# df = pd.read_csv('./adult-small.data',
# names=features)
# df.dropna()
# df.drop_duplicates()
# df = df[df['workclass'] != '?']
# df = df[df['occupation'] != '?']
# df = df[df['education'] != '?']
# df = df[df['marital-status'] != '?']
# df = df[df['relationship'] != '?']
# df = df[df['race'] != '?']
# df = df[df['sex'] != '?']
# df = df[df['native-country'] != '?']
# X = pd.get_dummies(df, columns=['workclass', 'education', 'marital-status', 'occupation', 'relationship', 'race', 'sex', 'native-country'])
# X['<=50k'] = X['<=50k'].map({'<=50K':1, '>50K': 0})
# y = X['<=50k']
# X = X.drop(['<=50k'], axis=1)
df = pd.read_csv('./bank-additional.csv', delimiter=';')
df.dropna()
df.drop_duplicates()
X = pd.get_dummies(df,
columns=[
'job', 'marital', 'education', 'default', 'housing',
'loan', 'contact', 'month', 'day_of_week',
'poutcome'
])
X.dropna()
X['y'].value_counts()
X['y'] = X['y'].map({'yes': 1, 'no': 0})
y = X['y']
X = X.drop(['y'], axis=1)
kurt_arr = []
loss_arr = []
fig, (ax1, ax2) = plt.subplots(2, 1, sharex=True)
for i in range(X.shape[1]):
print("Doing {} components...".format(i + 1))
ica = FastICA(whiten=True, n_components=i + 1)
X_transformed = ica.fit_transform(X)
print(kurtosis(X_transformed, axis=1))
print(np.average(kurtosis(X_transformed, axis=1)))
kurt_arr.append(np.average(kurtosis(X_transformed, axis=1)))
X_reconstructed = ica.inverse_transform(X_transformed)
loss_arr.append(((X - X_reconstructed)**2).mean().sum())
ax1.plot(np.arange(X.shape[1]), kurt_arr, label="kurtosis")
ax1.set_ylabel("Avg Kurtosis")
ax2.plot(np.arange(X.shape[1]), loss_arr, label="reconstruction error")
ax2.set_ylabel("Avg RMSE")
plt.xlabel("n_components")
fig.suptitle("Kurtosis vs ICA Dimensionality Reduction DS2")
plt.savefig("icads2.png")
def recon_ica(data, targeet, targets, name):
components = 42
if len(data[0]) < 42:
components = 7
ica = FastICA(n_components=components, random_state=0, max_iter=100000)
X_r = ica.fit(data).transform(data)
recon = ica.inverse_transform(X_r)
mse = ((data - recon)**2).mean()
print 'ICA reconstruction with %s components is %s' % (components, mse)
def var_test_ica(flux_arr_orig, exposure_list, wavelengths, low_n=3, hi_n=100, n_step=1, show_plots=False,
show_summary_plot=False, save_summary_plot=True, test_ind=7, real_time_progress=False,
idstr=None):
start_ind = np.min(np.nonzero(flux_arr_orig[test_ind]))
end_ind = np.max(np.nonzero(flux_arr_orig[test_ind]))
perf_table = Table(names=["n", "avg_diff2", "max_diff_scaled"], dtype=["i4", "f4", "f4"])
if hi_n > flux_arr_orig.shape[0]-1:
hi_n = flux_arr_orig.shape[0]-1
for n in range(low_n, hi_n, n_step):
ica = FastICA(n_components = n, whiten=True, max_iter=750, random_state=1234975)
test_arr = flux_arr_orig[test_ind].copy()
flux_arr = np.vstack([flux_arr_orig[:test_ind], flux_arr_orig[test_ind+1:]])
ica_flux_arr = flux_arr.copy() #keep back one for testing
ica.fit(ica_flux_arr)
ica_trans = ica.transform(test_arr.copy(), copy=True)
ica_rev = ica.inverse_transform(ica_trans.copy(), copy=True)
avg_diff2 = np.ma.sum(np.ma.power(test_arr-ica_rev[0],2)) / (end_ind-start_ind)
max_diff_scaled = np.ma.max(np.ma.abs(test_arr-ica_rev[0])) / (end_ind-start_ind)
perf_table.add_row([n, avg_diff2, max_diff_scaled])
if real_time_progress:
print "n: {:4d}, avg (diff^2): {:0.5f}, scaled (max diff): {:0.5f}".format(n, avg_diff2, max_diff_scaled)
if show_plots:
plt.plot(wavelengths, test_arr)
plt.plot(wavelengths, ica_rev[0])
plt.plot(wavelengths, test_arr-ica_rev[0])
plt.legend(['orig', 'ica', 'orig-ica'])
plt.xlim((wavelengths[start_ind], wavelengths[end_ind]))
plt.title("n={}, avg (diff^2)={}".format(n, avg_diff2))
plt.tight_layout()
plt.show()
plt.close()
if show_summary_plot or save_summary_plot:
plt.plot(perf_table['n'], perf_table['avg_diff2'])
plt.plot(perf_table['n'], perf_table['max_diff_scaled'])
plt.title("performance")
plt.tight_layout()
if show_summary_plot:
plt.show()
if save_summary_plot:
if idstr is None:
idstr = random.randint(1000000, 9999999)
plt.savefig("ica_performance_{}.png".format(idstr))
plt.close()
return perf_table
def filter_with_ica( X ):
#pca = PCA(0.90).fit(X)
pca = PCA().fit(X)
n_c = pca.n_components_
#n_c = 2
ica = FastICA(n_components=n_c)
ica.fit(X)
eeg_ica = ica.fit_transform(X)
eeg_restored = ica.inverse_transform(eeg_ica)
return eeg_restored
def fast_ICA_fit(n_components, train, test, shape):
# Set and fit FastICA
fica = FastICA(n_components=n_components)
fica.fit(train)
# Reduce dimension
test_reduced = fica.transform(test)
# Recover data from the lower dimension
test_recovered = fica.inverse_transform(test_reduced)
# Calculate the MSE
mse = np.mean((test_recovered - test)**2)
# Reshape into a matrix
test_recovered = test_recovered.reshape(shape)
return fica, test_recovered, mse
def ica_analysis(spectra, nComps=5):
sdssFluxes = get_data_spectra(spectra)
ica = FastICA(n_components=nComps)
ica.fit(sdssFluxes)
weights = ica.fit_transform(sdssFluxes)
comps = ica.components_.transpose()
reconFluxes = ica.inverse_transform(
weights) # weights.dot(ica.mixing_) + ica.mean_
loss = ((sdssFluxes - reconFluxes)**2).mean()
spectraICA = ica_spectra_dict(spectra, weights, reconFluxes)
return spectraICA, ica.mixing_, ica.mean_
class FastICA():
'''This class implements the Fast ICA algorithm to remove artifacts
it may do this automatically or the user can select the components
to remove'''
def __init__(self, signals, t, fr):
self.signals = signals
self.components = []
self.amUnits = []
self.duration = t
self.frequency = fr
self.selectedComponents = []
self.icaParameters = []
# actual FastICA algorithm part 1: just creating matrix of independent components
def separateComponents(self):
self.ica = ICA(n_components=len(self.signals[0]), max_iter=300)
self.components = np.matrix.transpose(
self.ica.fit_transform(self.signals))
self.amUnits = [np.amax(self.components), np.amin(self.components)]
self.selectedComponents = list(range(len(self.components)))
# recreates signals with the independent components selected
def recreateSignals(self):
# modify the mixing matrix so it only adds the selected components
for i in range(len(self.components)):
if not self.isSelected(i):
# turn to 0 all this component
self.components[i] = [0.0] * len(self.components[i])
self.signals = self.ica.inverse_transform(
np.matrix.transpose(np.array(self.components)))
# transposing
self.signals = np.matrix.transpose(self.signals)
def isSelected(self, i):
for selected in self.selectedComponents:
if i == selected:
return True
return False
# returns the components so user can see them and select manually
def getComponents(self):
return self.components
# sets the components to recreate signals after user selects them
def setComponents(self, components):
self.selectedComponents = components
# returns the signals in there current state
def getSignals(self):
return self.signals
def test_inverse_transform(whiten, n_components, expected_mixing_shape):
# Test FastICA.inverse_transform
n_samples = 100
rng = np.random.RandomState(0)
X = rng.random_sample((n_samples, 10))
ica = FastICA(n_components=n_components, random_state=rng, whiten=whiten)
Xt = ica.fit_transform(X)
assert ica.mixing_.shape == expected_mixing_shape
X2 = ica.inverse_transform(Xt)
assert X.shape == X2.shape
# reversibility test in non-reduction case
if n_components == X.shape[1]:
assert_array_almost_equal(X, X2)
def PerformIca2(X,Y,num_components,random_state):
result = {}
for n in num_components:
prefix = "ica_" + str(n) + "_"
algo = FastICA(n_components=n,random_state=random_state)
algo.fit(X)
result[prefix+"algo"] = algo
_x = algo.transform(X)
X_recons = algo.inverse_transform(_x)
result[prefix+"reconstruction_error"] = ComputeReconstructionSSE(X,X_recons)
kt_value = np.abs(kt(_x))
avg_kt = kt_value.mean()
print("ICA num dim {0} : reconstruction error {1} avg kt {2}".format(str(n),str(result[prefix+"reconstruction_error"]),str(avg_kt)))
print(np.sort(kt_value))
return result
def wavelet_BSS(data):
raw = data
tp,channels = raw.shape
wv = pywt.Wavelet('dmey')
reduced_tp = int(pywt.dwt_coeff_len(data_len=tp, filter_len=wv.dec_len, mode='symmetric'))
WT = np.zeros((reduced_tp,channels-1))
#coeff = np.zeros((22)) #coeffcients from wavelet transformation
coeff = np.zeros((reduced_tp,channels-1))
for c in range(channels-1): #exclude the markers
A,B = wavelet_trans(raw[:,c],wv)
WT[:,c] = A
#coeff[c] = B
coeff[:,c] = B
n=19 #general neurology techniques say to keep as many channels as possible
#Essentially, remove the noisiest channel
#The remaining channels will be cleaned
#
Z = WT #Define source space as wavelet data
ica = FastICA(n_components = n-1,whiten=True) #use all components but one
Z_ = ica.fit_transform(Z) #Estimated Source Space
A_ = ica.mixing_ #Retrieve estimated mixing matrix with reduced dimension
W_p = np.linalg.pinv(A_) #forced inverse of modified mixing matrix is the unmixing matrix
#X_filt = np.matmul(Z_,A_)
####create cleaned stack with outlier_detection####
weights = np.zeros((reduced_tp,Z_.shape[1]))
stacks = np.zeros((reduced_tp,Z_.shape[1]))
for c_ in range(Z_.shape[1]):
inp = Z_[:,c_]
weights[:,c_],stacks[:,c_] = outlier_detection(inp)
stacks = robust_referencing(stacks,weights)
cleaned_Z_ = stacks.reshape((Z_.shape[0],Z_.shape[1]))
inv_cleaned_Z_ = ica.inverse_transform(cleaned_Z_)
inv_wavelet_cleaned_ica = np.zeros((tp,channels-1))
for c in range(channels-1): #exclude the markers
cA = inv_cleaned_Z_[:,c]
cD = coeff[:,c]
inv_data = inverse_wavelet(cA,cD)
inv_wavelet_cleaned_ica[:,c] = inv_data
return inv_wavelet_cleaned_ica;
def reconstruction_similarity(X,method_name,comp = 2): if method_name == 'PCA': pca = PCA(n_components=comp) X_r = pca.fit(X).transform(X) X_inverse = pca.inverse_transform(X_r) if method_name == 'ICA': ica = FastICA(n_components=comp) X_r = ica.fit(X).transform(X) X_inverse = ica.inverse_transform(X_r) if method_name == 'RCA': rca = GaussianRandomProjection(n_components=comp) X_r = rca.fit(X).transform(X) X_inverse = np.matmul(X_r, rca.components_) similarity = cosine_similarity(X_inverse,X)[0][0] return similarity
def run_ica_and_plot(X, name, number_of_features, classification_labels):
# plot recunstruction error
reconstruction_error = []
for n_components in np.arange(1, number_of_features + 1):
ica = FastICA(n_components=n_components)
transformed_data = ica.fit_transform(X)
reconstruction_error.append(
np.sum(np.square(X - ica.inverse_transform(transformed_data))) /
X.size)
plt.figure()
plt.plot(np.arange(1, number_of_features + 1), reconstruction_error)
plt.xticks(np.arange(1, number_of_features + 1))
plt.xlabel('Components')
plt.ylabel('Reconstruction Error')
plt.title('{} : ICA Reconstruction Error'.format(name))
plt.grid()
plt.savefig('plots/{}-ica-reconstruction.png'.format(name))
plt.clf()
class trafo_ica:
def __init__(self, num_comp=0):
self.num_comp = num_comp
def transform(self, data):
try:
self.num_comp = len(data[0]) if self.num_comp == 0 else self.num_comp
self.ica = FastICA(n_components=self.num_comp, max_iter=500, tol=0.01).fit(data)
except:
return data
else:
return self.ica.transform(data)
def transform_back(self, points):
try:
return self.ica.inverse_transform(points)
except:
return points
def applyICA(label,
method,
X,
n_components,
usen,
reconstructimages=False,
seed=seed):
print("doing %s..." % (method))
mse = []
firstimages = []
model = None
n = -1
Xt = None
ngratio = []
meank = []
for n in n_components:
model = FastICA(n_components=n, random_state=seed)
Xt = model.fit_transform(X)
Xr = model.inverse_transform(Xt)
mse.append(mean_squared_error(X, Xr))
firstimages.append(Xr[0, :])
k = pd.DataFrame(Xt).kurtosis().abs()
meank.append(k.mean())
ngratio.append(len(k[k > 2]) * 1. / len(k))
print("done. plotting...")
plot_re(label, method, mse, n_components)
if reconstructimages:
firstimages.insert(0, np.array(X.iloc[0, :]))
plot_first_images(firstimages, n_components, method, label)
print("mean kurtosis = %.5f" % (k.mean()))
print("total no of components = %d" % (len(k)))
print("no of components that are non-gaussian = %d" % (len(k[k > 2.])))
plot_2axis(meank, ngratio, n_components, 'mean kurtosis',
'n non-gaussian/n components', 'n components',
'%s kurtosis and non-gaussian sources' % (method),
'%s-%s-kurt-ng.png' % (label.replace(" ", "-"), method))
model = FastICA(n_components=usen, random_state=seed)
model = model.fit(X)
return model
def rec_err_plot(x, comps, title, filnam):
components = np.arange(1, comps + 1, 1)
err = []
for c in components:
temp = []
for i in range(5):
ica = FastICA(n_components=c, max_iter=500, tol=0.01)
dataset = ica.fit_transform(x)
transformed = ica.inverse_transform(dataset)
temp.append(reconstruction_error(x, transformed))
err.append(float(sum(temp)) / len(temp))
plt.clf()
plt.plot(components, err, marker='o')
plt.xlabel("Components")
plt.ylabel("Reconstruction Error")
plt.title(title)
plt.grid(b=True)
plt.savefig(filnam)
return
def ica(input_matrix: np.array, inverse: bool=False):
"""
Performs ICA on an input in
order to reduce dimensionality.
"""
trials, channels, samples = np.shape(input_matrix)
ica = FastICA(n_components=None)
transform = ica.fit_transform(np.vstack(input_matrix))
transform = np.reshape(transform, (-1, channels, samples))
covariance = np.corrcoef(np.mean(transform, axis=0))
high, low = _correlate(covariance)
stacked = np.vstack(transform[:, low, :])
if inverse:
stacked = ica.inverse_transform(stacked)
return np.reshape(inverse, (trials, -1, samples))
sp1.plot(t,signal2)
plt.show()
cpath='/home/bejar/MEG/Data/control/'
cres='/home/bejar/Documentos/Investigacion/MEG/res/'
#name='MMN-201205251030'
name='control1-MEG'
mats=scipy.io.loadmat( cpath+name+'.mat')
data= mats['data']
chann=mats['names']
samplerate=500
length=5000
chann=120
width=25
dbuffer=data[[149,43,48,27,29,109,128],5000:10000]
fica=FastICA(n_components=6,algorithm='deflation',fun='exp',max_iter=1000)
res=fica.fit_transform(dbuffer.transpose())
#for i in range(res.shape[1]):
# plotOneSignal(res[:,i])
plotOneSignal(res[:,0])
res[:,0]=0
inv=fica.inverse_transform(res)
plotTwoSignal(data[149,5000:10000],inv[:,0])
def ica(self):
fica = FastICA()
utility_normal_fica = fica.fit_transform(self.ds.utility_normal)
self.utility_normal_back = fica.inverse_transform(utility_normal_fica)
class ICA(object):
"""
Wrapper for sklearn package. Performs fast ICA (Independent Component Analysis)
ICA has 4 methods:
- fit(waveforms)
update class instance with ICA fit
- fit_transform()
do what fit() does, but additionally return the projection onto ICA space
- inverse_transform(A)
inverses the decomposition, returns waveforms for an input A, using Z
- get_params()
returns metadata used for fits.
"""
def __init__(self, num_components=10,
catalog_name='unknown',
whiten=True,
fun = 'logcosh',
fun_args = None,
max_iter = 600,
tol = .00001,
w_init = None,
random_state = None,
algorithm = 'parallel'):
self._decomposition = 'Fast ICA'
self._num_components = num_components
self._catalog_name = catalog_name
self._whiten = whiten
self._fun = fun
self._fun_args = fun_args
self._max_iter = max_iter
self._tol = tol
self._w_init = w_init
self._random_state = random_state
self._algorithm = algorithm
self._ICA = FastICA(n_components=self._num_components,
whiten = self._whiten,
fun = self._fun,
fun_args = self._fun_args,
max_iter = self._max_iter,
tol = self._tol,
w_init = self._w_init,
random_state = self._random_state,
algorithm = self._algorithm)
def fit(self,waveforms):
# TODO make sure there are more columns than rows (transpose if not)
# normalize waveforms
self._waveforms = waveforms
self._ICA.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._ICA.fit_transform(self._waveforms)
return self._A
def inverse_transform(self,A):
# convert basis back to waveforms using fit
new_waveforms = self._ICA.inverse_transform(A)
return new_waveforms
def get_params(self):
# TODO know what catalog was used! (include waveform metadata)
params = self._ICA.get_params()
params['num_components'] = params.pop('n_components')
params['Decompositon'] = self._decomposition
return params
def get_basis(self):
""" Return the ICA basis vectors (Z^\dagger)"""
return self._ICA.get_mixing_matrix()
class SpatialFilter:
def __init__(self, chanNum):
global numComponents
if chanNum == 14:
numComponents = 4
else:
numComponents = 8
self.ica = FastICA(n_components=numComponents,max_iter=800)
self.chanNum = chanNum
# funkcia vykonáva filtrovanie pomocou metódy ICA, pre 64 el. signál
# obsahuje funkčné heuristiky na identifikáciu P300 komponentov
def icaFilter (self,signal):
global numComponents
if self.chanNum == 64:
numComponents = 8
channelPositions = channelPositionsDataset
frontBottomBorder = 2
centerLeftBorder = 2
centerRightBorder = 9
centerBottomBorder = 7
centerTopBorder = 2
leftBorder = 2
rightBorder = 9
else:
numComponents = 4
channelPositions = channelPositionsEpoc
frontBottomBorder = 1
centerLeftBorder = 1
centerRightBorder = 7
centerBottomBorder = 6
centerTopBorder = 1
leftBorder = 1
rightBorder = 7
components = self.ica.fit_transform(signal)
############################ Výber P300 komponentov ############################
toRejectFound = []
for i in range(numComponents):
component = self.ica.mixing_[:,i]
## výpočet priemerných potenciálov na jednotlivých miestach hlavy ##
## Front average potential ##
frontChannels = channelPositions[:frontBottomBorder]
frontChannels = [list(y for y in x if y) for x in frontChannels]
sumFront = 0
sumChanFront = 0
for m in range(len(frontChannels)):
for n in frontChannels[m]:
sumFront+=abs(component[n-1])
sumChanFront+=1
averageFront = sumFront/sumChanFront
## Center average potential ##
centerChannels = channelPositions[centerTopBorder:centerBottomBorder,centerLeftBorder:centerRightBorder]
centerChannels = [list(y for y in x if y) for x in centerChannels]
sumCenter = 0
sumChanCenter = 0
for m in range(len(centerChannels)):
for n in centerChannels[m]:
sumCenter+=abs(component[n-1])
sumChanCenter+=1
averageCenter = sumCenter/sumChanCenter
## Left average potential ##
leftChannels = channelPositions[:,:leftBorder]
leftChannels = [list(y for y in x if y) for x in leftChannels]
sumLeft = 0
sumChanLeft = 0
for m in range(len(leftChannels)):
for n in leftChannels[m]:
sumLeft+=abs(component[n-1])
sumChanLeft+=1
averageLeft = sumLeft/sumChanLeft
## Right average potential ##
rightChannels = channelPositions[:,rightBorder:]
rightChannels = [list(y for y in x if y) for x in rightChannels]
sumRight = 0
sumChanRight = 0
for m in range(len(rightChannels)):
for n in rightChannels[m]:
sumRight+=abs(component[n-1])
sumChanRight+=1
averageRight = sumRight/sumChanRight
ratioSum = (averageFront+averageRight+averageLeft)/averageCenter
ratioFrontalBack = (averageFront+averageCenter)/(averageLeft+averageRight)
toUse = 0
### heuristiky na základe priestorového rozloženia
if self.chanNum == 64:
if int(ratioSum) == 1:
toUse = 1
if ratioFrontalBack > 1 and ratioFrontalBack < 3 and not (averageFront/averageCenter > 2):
toUse = 1
if ratioSum < 1:
toUse = 1
else:
totalAverage = abs(component.mean())
maxChan = abs(max(component.min(), component.max(), key=abs))
if totalAverage*3 > maxChan and ratioSum < 5:
toUse = 1
if averageCenter > averageFront and averageCenter > averageRight and averageCenter > averageLeft and ratioSum < 5:
toUse = 1
if ratioSum < 2:
toUse = 1
if toUse == 0:
toRejectFound.append(i+1)
print "IC"+str(i+1)+"\t Front:"+str(int(averageFront))+"\t Center:"+str(int(averageCenter))\
+"\t Right:"+str(int(averageRight))+"\t Left:"+str(int(averageLeft))+"\t Ratio:"+str(ratioSum)
else:
print "USED: IC"+str(i+1)+"\t Front:"+str(int(averageFront))+"\t Center:"+str(int(averageCenter))\
+"\t Right:"+str(int(averageRight))+"\t Left:"+str(int(averageLeft))+"\t Ratio:"+str(ratioSum)
#### Zobrazenie komponentov (Heatmapa, časový rad, ) ######
# visualizer = Visualizer()
# visualizer.plotComponents(self.ica,channelPositions,components)
#################### Odstránenie nežiadúcich komponentov z mixovacej matice ##################
compNums = toRejectFound
compNums.sort(reverse=True)
### Výber komponentov ručne
# rejected = raw_input("Enter numbers of rejected components")
# compNums = rejected.split()
# for m in range (len(compNums)):
# compNums[m] = int(compNums[m])
# compNums.sort(reverse=True)
for i in compNums:
self.ica.mixing_[:,i-1] = 0
reconstructed = self.ica.inverse_transform(components)
### Zobrazenie grafu filtrovaného signálu ###
# visualizer.plotSignalRepairing(signal,reconstructed)
return reconstructed.T
# spriemerovany char list pre jeden cielovy typ vysvietenia, vystupom je single element z povodnych N elektrod
# mode = 0 - reduce, z 64 elektrod zober len tie z najdeneho subsetu
# mode = 1 - guess, zober vsetky elektrody, signal co si dostal uz je len zo subsetu
def grandAveragingFilter (self,isiBinList,subset,mode, isiCount = 12):
chl = [IsiBin() for i in range(isiCount)]
chl = isiBinList
output = []
for i in range(len(chl)):
#print "Grand averaging letter:",i,"\n"
charChannList = chl[i]
epoch = []
for m in range(len(charChannList.channelsSignalsAveraged[0])):
tmp = []
if mode == 0:
for l in subset:
tmp.append(charChannList.channelsSignalsAveraged[l][m])
else:
for l in range (len(charChannList.channelsSignalsAveraged)):
tmp.append(charChannList.channelsSignalsAveraged[l][m])
epoch.append(np.mean(tmp))
output.append(epoch)
return output