def generate_y_mnist(*,
parameters=settings.parameters,
recursive_regenerate=False):
"""
PREDECESSOR: X_mnist
:param parameters: dictionary. Can contain those values:
"num_images_raw": Number of the images to select from MNIST. Later only non-similar images will
be kept.
"selection_random_seed": Random seed for selecting random images from entire MNIST.
"num_pca_dimensions": number of kept dimesions after PCA decomposition.
"pca_random_seed": random seed for PCA calculation.
"tsne_random_seed": random seed for tSNE algorithm
"tsne_perpelxity": perplexity for tSNE algorithm
:param recursive_regenerate: Regenerate predecessors as well
"""
import lion_tsne
tsne_random_seed = parameters.get("tsne_random_seed",
settings.parameters["tsne_random_seed"])
tsne_perplexity = parameters.get("tsne_perplexity",
settings.parameters["tsne_perplexity"])
tsne_momentum = parameters.get("tsne_momentum",
settings.parameters["tsne_momentum"])
tsne_n_iters = parameters.get("tsne_n_iters",
settings.parameters["tsne_n_iters"])
tsne_early_exaggeration_iters = parameters.get(
"tsne_early_exaggeration_iters",
settings.parameters["tsne_early_exaggeration_iters"])
X_mnist = load_x_mnist(parameters=parameters,
regenerate=recursive_regenerate,
recursive_regenerate=recursive_regenerate)
dTSNE_mnist = lion_tsne.LionTSNE(perplexity=tsne_perplexity)
Y_mnist = dTSNE_mnist.fit(X_mnist,
optimizer_kwargs={
'momentum':
tsne_momentum,
'n_iter':
tsne_n_iters,
'early_exaggeration_iters':
tsne_early_exaggeration_iters
},
random_seed=tsne_random_seed,
verbose=2)
save_and_report(get_y_mnist_filename, parameters, Y_mnist)
save_and_report(get_dtsne_mnist_filename, parameters, dTSNE_mnist)
import os
from sklearn.datasets import load_iris
import matplotlib.pyplot as plt
# Importing from parent directory
sys.path.append(
os.path.dirname(os.path.dirname(os.path.dirname(
os.path.abspath(__file__)))))
import lion_tsne
if __name__ == "__main__":
data = load_iris()
X = data.data
labels = data.target
dTSNE = lion_tsne.LionTSNE(perplexity=20)
# Small dataset. Iterations are very fast, we can afford more
y = dTSNE.fit(X,
verbose=2,
optimizer_kwargs={
'momentum': 0.8,
'n_iter': 3000
},
random_seed=1)
plt.gcf().set_size_inches(10, 10)
legend_list = list()
for l in set(sorted(labels)):
plt.scatter(y[labels == l, 0], y[labels == l, 1])
legend_list.append(str(data.target_names[l]))
plt.legend(legend_list)
def load_mnist_data(prepare_cluster_attribution_test=True):
"""
Loads a subset of MNIST dataset and a result of its tSNE processing.
:param prepare_cluster_attribution_test: Will prepare additional data for cluster attribution test
:return: a tuple with several values
[0] - X_mnist, 2500x30, first index - MNIST image, second index - first 30 PCA components
[1] - Y_mnist, 2500x2, first index - MNIST image (same sa above), second index - tSNE results
[2] - X_mnist_raw, 2500x784, first index - MNIST image, second index - unrolled 28x28 grayscale image (values
between 0 and 1)
[3] - labels_mnist, 2500-long array of labels for images
[4] - dTSNE_mnist, LION-tSNE incorporation of the data. Actually, you can generate other embeddings from that
object as well.
[5] - mnist_chosen_indices, 2500-long array, which elements of MNIST dataset correspond to 2500-long subset
If prepare_cluster_attribution_test:
[6] - X_mnist_unchosen_raw
[7] - X_mnist_unchosen_pca
[8] - labels_mnist_unchosen
"""
print("Loading from file...")
with open(mnist_file, 'rb') as f:
X_mnist_raw, P_mnist, sigma_mnist, Y_mnist, labels_mnist_onehot, mnist_pca, \
all_mnist_trained_images, all_mnist_labels, mnist_chosen_indices = pickle.load(f)
labels_mnist = np.argmax(labels_mnist_onehot, axis=1)
temp = np.ascontiguousarray(X_mnist_raw).view(
np.dtype((np.void, X_mnist_raw.dtype.itemsize * X_mnist_raw.shape[1])))
_, un_idx = np.unique(temp, return_index=True)
X_mnist_raw = X_mnist_raw[un_idx, :]
labels_mnist = labels_mnist[un_idx]
mnist_chosen_indices = mnist_chosen_indices[un_idx]
X_mnist = mnist_pca.transform(X_mnist_raw)
dTSNE_mnist = lion_tsne.LionTSNE(perplexity=30)
dTSNE_mnist.incorporate(x=X_mnist,
y=Y_mnist,
p_matrix=P_mnist,
sigma=sigma_mnist)
D = distance.pdist(X_mnist)
min_dist = np.min(D)
print("After PCA - minimum distance between samples is ", min_dist,
"\nExpected: ", expected_min_dist, "\nDifference: ",
min_dist - expected_min_dist)
return_tuple = X_mnist, Y_mnist, X_mnist_raw, labels_mnist, dTSNE_mnist, mnist_chosen_indices
if prepare_cluster_attribution_test:
print("Generating data for cluster attribution test")
ind_unchosen = [
i for i in range(len(all_mnist_labels))
if i not in mnist_chosen_indices
]
np.random.seed(
10
) # Any seed, just don't use it again for selecting indices from same dataset
X_mnist_unchosen_raw = all_mnist_trained_images[ind_unchosen]
labels_mnist_unchosen = all_mnist_trained_images[ind_unchosen]
labels_mnist_unchosen = np.argmax(labels_mnist_unchosen, axis=1)
X_mnist_unchosen_pca = mnist_pca.transform(X_mnist_unchosen_raw)
return_tuple += X_mnist_unchosen_raw, X_mnist_unchosen_pca, labels_mnist_unchosen
return return_tuple
import matplotlib.pyplot as plt
from matplotlib.font_manager import FontProperties
import numpy as np
import lion_tsne
# This is 1-D illustration of "pull to the center" effect. Plot will appear in the discussion section
x_1d = np.array([[10], [20], [30], [40]])
y_1d = np.array([[10], [40], [1], [50]])
simple_example_model = lion_tsne.LionTSNE(perplexity=2)
simple_example_model.incorporate(x_1d, y_1d)
x = np.arange(0, 50, 0.1).reshape((-1, 1))
powers_and_colors = {0.2: 'blue', 2: 'red', 20: 'green'}
legend_by_p = {0.2: r'Low $p$', 2: r'Medium $p$', 20: r'High $p$'}
plt.figure(dpi=300)
plt.gcf().set_size_inches(3.3, 2)
font_properties = FontProperties()
font_properties.set_family('serif')
font_properties.set_name('Times New Roman')
font_properties.set_size(8)
legend_list = list()
for p in powers_and_colors:
interpolator = simple_example_model.generate_embedding_function(
embedding_function_type='weighted-inverse-distance',
function_kwargs={'power': p})
y_weighted = interpolator(x)
plt.plot(x, y_weighted)
